User:Abyssal/List of the prehistoric life of Mexico

This list of the prehistoric life of Alabama contains the various prehistoric life-forms whose fossilized remains have been reported from within the country of Alabama.

Precambrian

 * † Aspidella – or unidentified comparable form
 * † Aspidella terranovica
 * † Cloudina
 * † Cloudina sp.
 * † Collenia – tentative report
 * † Collenia sp.
 * † Conophyton
 * † Conophyton sp.
 * † Jacutophyton
 * † Jacutophyton sp.
 * † Lockeia
 * † Lockeia sp.
 * † Palaeophycus
 * † Palaeophycus tubularis
 * † Platella
 * † Platella sp.
 * † Sekwia
 * † Sekwia sp.

Paleozoic

 * † Acanthocladia
 * † Acanthocladia guadalupensis
 * † Acanthopecten
 * † Acanthopecten coloradoensis
 * † Acrothele
 * † Acrothele concava
 * † Acrothele sp.
 * † Actinoconchus
 * † Actinoconchus lamellosus
 * † Adetognathus
 * † Adetognathus lautus
 * † Adetognathus spathus
 * † Agathiceras
 * † Agathiceras girtyi
 * † Ajacicyathus
 * † Ajacicyathus nevadensis
 * † Ajacicyathus rimouski
 * † Akoldinioidia
 * † Akoldinioidia sulcatus – type locality for species
 * † Albertella
 * † Albertella proveedora – or unidentified related form
 * † Albertella proveedora
 * † Alisina
 * † Alisina mexicana
 * † Alispirifer
 * † Alispirifer tamaulipensis – type locality for species
 * † Alokistocare
 * † Alokistocare althea
 * † Alokistocare mexicana
 * † Alokistocare modestum – or unidentified related form
 * † Alokistocare modestum
 * † Amaurotoma
 * † Amaurotoma sp.
 * † Amecephalus
 * † Amecephalus arrojoensis
 * † Amerista – tentative report
 * † Amerista
 * † Amerista sp.
 * † Amphistrophia
 * † Amphistrophia sp.
 * † Amplexizaphrentis
 * † Amplexizaphrentis circularis – type locality for species
 * † Amplexizaphrentis sp.
 * † Angelina
 * † Angelina hyeronimi
 * † Angelina spinosa – type locality for species
 * † Anidanthus
 * † Anidanthus sp.
 * † Anisopyge
 * † Anisopyge perannulata
 * † Annularia
 * † Annularia sp.
 * † Anomphalus
 * † Anomphalus sp.
 * † Antagmus
 * † Antagmus buttsi
 * † Antagmus solitarius
 * † Antiquatonia
 * † Antiquatonia sp.
 * † Apachella – or unidentified comparable form
 * † Apachella
 * † Apachella arizonensis
 * † Apachella sp.
 * † Archaeocyathus
 * † Archaeocyathus arborensis
 * † Archaeocyathus sp.
 * † Archaeocyathus yavorskii
 * † Archiastrella
 * † Archiastrella sp.
 * † Arellana
 * † Arellana sonora – or unidentified comparable form
 * † Arellana sonora
 * † Arellanella
 * † Arellanella caborcana
 * † Arenovidalina – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Arenovidalina novospolovi – or unidentified comparable form
 * † Arrythmocricus
 * † Arrythmocricus macdamensis
 * † Asaphellus
 * † Asaphellus artus – type locality for species
 * † Asaphellus aspinus – type locality for species
 * † Asaphellus communis – type locality for species
 * † Asaphellus communis
 * † Astartella
 * † Astartella concentrica
 * † Astartella subquadrata
 * † Athabaskia
 * † Athabaskia bela
 * † Athabaskia minor
 * † Atrypa
 * † Atrypa reticularis
 * † Atrypa sp.
 * † Attenuatella
 * † Attenuatella attenuata – type locality for species
 * † Aulocricus
 * † Aulocricus arellani
 * † Aviculopecten
 * † Aviculopecten basilicus – or unidentified comparable form
 * † Aviculopecten sp. Ainformal
 * † Aviculopecten sp. Binformal
 * † Aviculopecten sp. Cinformal
 * † Aviculopecten sp. Dinformal
 * † Aviculopinna
 * † Aviculopinna sp.
 * † Avonia – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Avonia
 * † Avonia subhorrida
 * † Avonia subquadrata – type locality for species
 * † Babylonites
 * † Babylonites acutus
 * † Babylonites sp.
 * † Bactrites
 * † Bactrites mexicanus
 * † Bakevellia
 * † Bakevellia sp.
 * † Batenevia
 * † Batenevia spinosa – type locality for species
 * † Batenevia spinosa
 * † Bathymyonia
 * † Bathymyonia nevadensis – or unidentified comparable form
 * † Bathymyonia nevadensis
 * † Bathyuriscus
 * † Bathyuriscus sp.
 * † Baturria
 * † Baturria mexicana
 * † Baylea
 * † Baylea sp.
 * † Baylea sp. 1informal
 * † Baylea sp. 2informal
 * † Baylea yvanii – or unidentified related form
 * † Beecheria
 * † Beecheria sp.
 * † Bellerophon – tentative report
 * † Bellerophon
 * † Bellerophon sp.
 * † Bergaueria
 * † Bergaueria sp.
 * † Bienvillia
 * † Bienvillia grandis – type locality for species
 * † Bienvillia tetragonalis
 * † Bifodina
 * † Bifodina longifrons – type locality for species
 * † Bitaunioceras
 * † Bitaunioceras coahuilense
 * † Bonnia
 * † Bonnia sonora
 * † Borestus
 * † Borestus sp.
 * † Bristolia
 * † Bristolia bristolensis – or unidentified comparable form
 * † Bryantodus
 * † Bryantodus sp.
 * † Caborcella
 * † Caborcella arrojosensis
 * † Calamites
 * † Calamites sp.
 * † Callipteris
 * † Callipteris sp.
 * † Camarophorella
 * † Camarophorella sp.
 * † Camarotoechia
 * † Camarotoechia sp.
 * † Cambrotubulus
 * † Cambrotubulus decurvatus – or unidentified comparable form
 * † Cancrinella
 * † Cancrinella nunduva
 * † Cancrinella phosphatica
 * † Cancrinella rugosa – type locality for species
 * † Cancrinella rugosa
 * † Caninia
 * † Caninia corniculum
 * † Caninia sp.
 * † Caninophyllum
 * † Caninophyllum sonorense – type locality for species
 * † Cassianoides
 * † Cassianoides sp.
 * † Cavusgnathus
 * † Cavusgnathus unicornis
 * † Chaetetes
 * † Chaetetes sp.
 * † Chancelloria
 * † Chancelloria eros
 * † Chancelloria eros.
 * † Chancelloria sp.
 * † Chaunactis
 * † Chaunactis sp. 1informal
 * † Chelononia
 * † Chelononia straminea
 * † Chonetes – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Chonetes deliciasensis
 * † Chonetes foshagi – type locality for species
 * † Chonetes monosensis – type locality for species
 * † Chonetes monosensis
 * † Chonetes sp.
 * † Chonetinella
 * † Chonetinella gibberulus – type locality for species
 * † Chonetinella gibberulus
 * † Cibecuia – tentative report
 * † Cibecuia
 * † Cibecuia cedarensis
 * † Cibecuia sp.
 * † Cibolites – type locality for genus
 * † Cibolites
 * † Cibolites waageni – type locality for species
 * † Claruscoscinus – tentative report
 * † Claruscoscinus
 * † Claruscoscinus sp.
 * † Cleiothyridina
 * † Cleiothyridina glenparkensis
 * † Cleiothyridina sp.
 * † Cleiothyridina tenuilineata – or unidentified comparable form
 * † Climacammina
 * † Climacammina moelleriex gr.
 * † Codonofusiella
 * † Codonofusiella extensa
 * † Collemataria
 * † Collemataria americana – or unidentified comparable form
 * † Collinia
 * † Collinia sp.
 * † Composita
 * † Composita affinis
 * † Composita enormis
 * † Composita grandis – type locality for species
 * † Composita grandis – or unidentified comparable form
 * † Composita grandis
 * † Composita mira
 * † Composita obesa
 * † Composita sp.
 * † Compressoproductus
 * † Compressoproductus pinniformis – or unidentified related form
 * † Compressoproductus pinniformis
 * † Conocardium
 * † Conocardium sp.
 * † Coolinia
 * † Coolinia sp.
 * † Cordaites
 * † Cordaites sp.
 * † Cordilleracyathus
 * † Cordilleracyathus meridianus – type locality for species
 * † Cordilleracyathus meridianus
 * † Cordylodus
 * † Cordylodus angulatus
 * † Cordylodus oklahomensis
 * † Cordylodus proavus
 * † Cornulites
 * † Cornulites sp.
 * † Coscinocyathus
 * † Coscinocyathus sp.
 * † Costispinifera
 * † Costispinifera costata
 * † Cothodus – type locality for genus
 * † Cothodus sp.
 * † Craniops
 * † Craniops sp.
 * † Crurithyris
 * † Crurithyris levicula
 * † Cruziana
 * † Cruziana sp.
 * † Cruzina
 * † Cruzina sp.
 * † Cyathaxonia
 * † Cyathaxonia cordillerensis – type locality for species
 * † Cyclocaudex
 * † Cyclocaudex insaturatus
 * † Cyclocaudex jucundus
 * † Cyclocaudex typicus
 * † Cyclocrista
 * † Cyclocrista cheneyi
 * † Cyclocrista martini
 * † Cycloscapus
 * † Cycloscapus laevis
 * † Cylindritopsis
 * † Cylindritopsis insolitus
 * † Cyrtia
 * † Cyrtia sp.
 * † Cyrtina
 * † Cyrtina burlingtonensis
 * † Cyrtoniodus
 * † Cyrtoniodus sp.
 * † Cyrtorostra
 * † Cyrtorostra varicostata – or unidentified comparable form
 * † Cyrtospirifer – tentative report
 * † Cyrtospirifer latior
 * † Cystelasma
 * † Cystelasma invaginatum – type locality for species
 * † Dalejina
 * † Dalejina sp.
 * † Dasysaria
 * † Dasysaria sp.
 * † Declinognathodus
 * † Declinognathodus noduliferus
 * † Declinognathodus sp.
 * † Delthyris – tentative report
 * † Delthyris
 * † Delthyris sp.
 * † Demarezites
 * † Demarezites sp.
 * † Derbyia
 * † Derbyia arellanoi – type locality for species
 * † Derbyia arellanoi
 * † Derbyia elevata
 * † Derbyia elongata – type locality for species
 * † Derbyia elongata
 * † Derbyia nasuta
 * † Derbyia sp.
 * † Derbyoides
 * † Derbyoides dunbari – or unidentified comparable form
 * † Dichophyllum – or unidentified comparable form
 * † Dichophyllum sp.
 * † Dicoelosia
 * † Dicoelosia sp.
 * † Dictyoclostus – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Dictyoclostus
 * † Dictyoclostus sp.
 * † Dictyocyathus
 * † Dictyocyathus sp.
 * † Dictyonina
 * † Dictyonina minutipuncta
 * † Dictyonina sp.
 * † Dielasma
 * † Dielasma floresi – type locality for species
 * † Dielasma floresi
 * † Dielasma magniforaminiferum
 * † Dielasma sp.
 * † Dielasma spatulatum – or unidentified related form
 * † Dielasma spatulatum – or unidentified comparable form
 * † Dielasmoides – tentative report
 * † Dielasmoides
 * † Dielasmoides sp.
 * † Difuntites
 * † Difuntites hidius
 * † Diplognathodus
 * † Diplognathodus coloradoensis
 * † Diraphora
 * † Diraphora arrojosensis
 * † Ditomopyge
 * † Ditomopyge whitei – or unidentified comparable form
 * † Ditomopyge whitei
 * † Docoderma
 * † Docoderma sp.
 * † Domatoceras
 * † Domatoceras sp.
 * † Donaldina – or unidentified comparable form
 * † Donaldina robusta
 * † Dorsisinus – type locality for genus
 * † Dorsisinus louisianensis
 * † Dyoros
 * † Dyoros consanguineus – or unidentified comparable form
 * † Dyoros maya – type locality for species
 * † Echinaria
 * † Echinaria knighti
 * † Echinoconchella
 * † Echinoconchella elegans
 * † Echinoconchus
 * † Echinoconchus zapoteco
 * † Ectogrammysia
 * † Ectogrammysia prolata
 * † Edmondia
 * † Edmondia ovata
 * † Edmondia sp.
 * † Ehmaniella – tentative report
 * † Ehmaniella sp.
 * † Elrathina – tentative report
 * † Elrathina sp.
 * † Endothyra
 * † Endothyra bowmaniex gr.
 * † Entactinia
 * † Entactinia parva
 * † Entactinia sp.
 * † Enteletes
 * † Enteletes wordensis – or unidentified comparable form
 * † Eoaraxoceras
 * † Eoaraxoceras ruzhencevi – type locality for species
 * † Eoaraxoceras ruzhencevi
 * † Eoastarte
 * † Eoastarte subcircularis
 * † Eobucania
 * † Eobucania mexicana – type locality for species
 * † Eobucania mexicana
 * † Eoscaphelasma – tentative report
 * † Eoscaphelasma sp.
 * † Eoschubertella
 * † Eoschubertella texana
 * † Eospirifer
 * † Eospirifer sp.
 * † Eostaffella
 * † Eostaffella grozdilovae
 * † Eotuberitina
 * † Eotuberitina reitlingerae
 * † Epiphyton
 * † Epiphyton sp.
 * † Epithalassoceras
 * † Epithalassoceras ruzencevi
 * † Equisetum
 * † Equisetum sp.
 * † Ethmophyllum
 * † Ethmophyllum americanum
 * † Ethmophyllum cooperi
 * † Ethmophyllum whitneyi
 * † Euchondria
 * † Euchondria cooperi – or unidentified comparable form
 * † Euchondria levicula – or unidentified comparable form
 * † Euchondria sp.
 * † Eugonophyllum
 * † Eugonophyllum sp.
 * † Eumedlicottia
 * † Eumedlicottia burckhardti
 * † Eumedlicottia whitneyi
 * † Euomphalopterus
 * † Euomphalopterus sp.
 * † Euomphalus
 * † Euomphalus kaibabensis – tentative report
 * † Euomphalus kaibabensis
 * † Euomphalus sp.
 * † Euphemites
 * † Euphemites sp.
 * † Euphemitopsis
 * † Euphemitopsis subpapillosa
 * † Eurytreta – tentative report
 * † Eurytreta
 * † Eurytreta campaniformis – or unidentified comparable form
 * † Eurytreta fillmorensis – or unidentified comparable form
 * † Eurytreta sabrinae – or unidentified comparable form
 * † Eurytreta sp.
 * † Exallaspis
 * † Exallaspis sp. – type locality for species
 * † Fallotaspis – or unidentified comparable form
 * † Fallotaspis sp.
 * † Floricyclus
 * † Floricyclus angustimargo
 * † Floricyclus welleri
 * † Fusulinella
 * † Fusulinella accuminata – or unidentified related form
 * † Fusulinella clarki
 * † Fusulinella llanoensis
 * † Fusulinella searighti – tentative report
 * † Fusulinella thompsoni
 * † Gangamopteris – or unidentified comparable form
 * † Gangamopteris sp.
 * † Geragnostus
 * † Geragnostus intermidius
 * † Gigantopteris
 * † Gigantopteris sp.
 * † Girtyella – tentative report
 * † Girtyella
 * † Girtyella sp.
 * † Girvanella – tentative report
 * † Girvanella
 * † Girvanella mexicana
 * † Girvanella sinensis – or unidentified comparable form
 * † Girvanella sp.
 * † Glabrocingulum
 * † Glabrocingulum coronatum – or unidentified comparable form
 * † Globivalvulina
 * † Globivalvulina bulloides
 * † Glossopleura
 * † Glossopleura leona
 * † Glossopleura sp.
 * † Glossothyropsis
 * † Glossothyropsis magna – type locality for species
 * † Glossothyropsis magna
 * † Glyptospira
 * † Glyptospira sonorensis – type locality for species
 * † Glyptospira sp.
 * † Gnathodus
 * † Gnathodus bilineatus – tentative report
 * † Gnathodus defectus – tentative report
 * † Gnathodus girtyi
 * † Gnathodus sp.
 * † Gogia
 * † Gogia granulosa
 * † Gogia sp.
 * † Goniasma
 * † Goniasma sp.
 * † Goniasma terebra
 * † Gothodus – type locality for genus
 * † Gothodus sp.
 * † Graphoscyphia
 * † Graphoscyphia ramosa – type locality for species
 * † Graphoscyphia ramosa
 * † Guadalupia
 * † Guadalupia sp.
 * † Gymnagnostus – tentative report
 * † Gymnagnostus
 * † Gymnagnostus congros – type locality for species
 * † Gymnagnostus mexicanus – type locality for species
 * † Gypidula
 * † Gypidula sp.
 * † Hartzina
 * † Hartzina sp.
 * † Helcionella – tentative report
 * † Helcionella
 * † Helcionella sp.
 * † Helicoprion
 * † Helicoprion davisii
 * † Hercosia
 * † Hercosia uddeni
 * † Hertzina – tentative report
 * † Hertzina sp.
 * † Heteralosia
 * † Heteralosia mexicana – type locality for species
 * † Heterelasma
 * † Heterelasma contrerasi – type locality for species
 * † Heterelasma contrerasi
 * † Heterelasma shumardianum
 * † Heterostelechus
 * † Heterostelechus keithi
 * † Hindeodus
 * † Hindeodus cristulus – or unidentified comparable form
 * † Hindeodus minutus – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Hindeodus minutus
 * † Hindeodus sp.
 * † Hindeodus spiculus
 * † Holosia – tentative report
 * † Holosia sp.
 * † Hormathonema
 * † Hormathonema sp.
 * † Howellella – tentative report
 * † Howellella
 * † Howellella sp.
 * † Hustedia
 * † Hustedia circularis
 * † Hustedia elongata – type locality for species
 * † Hustedia meekana – or unidentified comparable form
 * † Hustedia meekana
 * † Hustedia mexicana
 * † Hustedia pusilla
 * † Hustedia shumardi – type locality for species
 * † Hustedia shumardi
 * † Hustedia sp.
 * † Hyolites
 * † Hyolites sp.
 * † Hyolithellus
 * † Hyolithellus sp.
 * † Hyolithes
 * † Hyolithes princepes – or unidentified related form
 * † Hyolithes sonora
 * † Hyolithes sp.
 * † Idiognathodus
 * † Idiognathodus claviformis – tentative report
 * † Idiognathodus sinuosis
 * † Idiognathodus sp.
 * † Idiognathoides
 * † Idiognathoides convexus
 * † Idiognathoides marginodosa
 * † Idiognathoides sinuatus – tentative report
 * † Idiognathoides sinuatus
 * † Idiognathoides sp.
 * † Inglefieldia
 * † Inglefieldia imperfecta
 * † Insolentitheca
 * † Insolentitheca horrida
 * † Isorthis – tentative report
 * † Isorthis
 * † Isorthis sp.
 * † Kamaena – tentative report
 * † Kamaena sp.
 * † Kansanella
 * † Kansanella neglecta
 * † Kansanella sp.
 * † Karavankina
 * † Karavankina fasciata – or unidentified comparable form
 * † Kargalites
 * † Kargalites mullerriedi – type locality for species
 * † Kingoceras – type locality for genus
 * † Kingoceras
 * † Kingoceras kingi – type locality for species
 * † Kingoceras kingi
 * † Kinishbia
 * † Kinishbia nodosa
 * † Kinishbia sp.
 * † Kistocare
 * † Kistocare corbinia
 * † Kistocare tontoensis
 * † Kiwetinokia
 * † Kiwetinokia sp.
 * † Kladognathus
 * † Kladognathus sp.
 * † Kochaspis – tentative report
 * † Kochaspis sp.
 * † Kochiproductus
 * † Kochiproductus peruvianus – or unidentified comparable form
 * † Komia
 * † Komia eganensis
 * † Koninckophyllum
 * † Koninckophyllum sp.
 * † Kootenia
 * † Kootenia exilaxata
 * † Kootenia sp.
 * † Kozlowskia
 * † Kozlowskia sp.
 * † Krotovia
 * † Krotovia sp.
 * † Lamellosathyris
 * † Lamellosathyris lamellosa
 * † Lamprosterigma
 * † Lamprosterigma erathense
 * † Lamprosterigma mirificum
 * † Latentifistula
 * † Latentifistula impella – or unidentified comparable form
 * † Latentifistula texana – or unidentified related form
 * † Latentifistula triacanthophora – or unidentified related form
 * † Laudonia
 * † Laudonia sp.
 * † Leiorhynchoidea – type locality for genus
 * † Leiorhynchoidea
 * † Leiorhynchoidea amygdaloidea
 * † Leiorhynchoidea cloudi – type locality for species
 * † Leiorhynchoidea cloudi
 * † Leiorhynchoidea laevis – type locality for species
 * † Leiorhynchoidea laevis
 * † Leiorhynchoidea schucherti – type locality for species
 * † Leiorhynchoidea schucherti
 * † Leiorhynchus
 * † Leiorhynchus bisulcatum
 * † Leptaena
 * † Leptaena cooperi – type locality for species
 * † Leptaena rhomboidalis
 * † Leptaena sp.
 * † Leptodesma
 * † Leptodesma falcata – or unidentified comparable form
 * † Leptodesma sp.
 * † Leptodus
 * † Leptodus americana
 * † Leptoplastides
 * † Leptoplastides marianus
 * † Leptostrophia
 * † Leptostrophia sp.
 * † Leurostega
 * † Leurostega aphelix – type locality for species
 * † Limipecten
 * † Limipecten texanus – or unidentified comparable form
 * † Linguella
 * † Linguella sp.
 * † Lingulella – tentative report
 * † Lingulella sp.
 * † Linnarsonia
 * † Linnarsonia sp.
 * † Linnarssonia
 * † Linnarssonia arellanoi
 * † Linnarssonia rara
 * † Linoproductus
 * † Linoproductus platyumbonus
 * † Linoproductus prattenianus – or unidentified comparable form
 * † Linoproductus sp.
 * † Linoproductus waagenianus
 * † Liosotella – type locality for genus
 * † Liosotella
 * † Liosotella angustata – type locality for species
 * † Liosotella angustata
 * † Liosotella magnirugosa – type locality for species
 * † Liosotella popei – tentative report
 * † Liosotella popei
 * † Liosotella rugosa – type locality for species
 * † Liosotella rugosa
 * † Liosotella sp.
 * † Liosotella subrugosa – type locality for species
 * † Liosotella subrugosa
 * † Liroceras – tentative report
 * † Liroceras sp.
 * † Lithostrotionella
 * † Lithostrotionella confluens – type locality for species
 * † Lobatannularia
 * † Lobatannularia sp.
 * † Lonchodus
 * † Lonchodus sp.
 * † Lophophyllidium
 * † Lophophyllidium kayseri
 * † Lophophyllidium sp.
 * † Lophophyllidium zaphrentoidea
 * † Luguella
 * † Luguella proveedorensis
 * † Lyroschizodus
 * † Lyroschizodus orbicularis – or unidentified comparable form
 * † Macropleura – tentative report
 * † Macropleura
 * † Macropleura sp.
 * † Marginifera
 * † Marginifera sp.
 * † Marginifera sp. 1informal
 * † Marginifera sp. 2informal
 * † Marginovatia
 * † Marginovatia aureocollis
 * † Marginovatia minor
 * † Marginovatia pumila – or unidentified comparable form
 * † Markocyathus – type locality for genus
 * † Markocyathus clementensis – type locality for species
 * † Martinia
 * † Martinia martinezi – type locality for species
 * † Martinia martinezi
 * † Mclearnites
 * † Mclearnites sp.
 * † Medlicottia
 * † Medlicottia costellifera
 * † Medlicottia sp.
 * † Meekella
 * † Meekella attenuata
 * † Meekella enigma – type locality for species
 * † Meekella enigma
 * † Meekella skenoides
 * † Meekella sp.
 * † Megousia
 * † Megousia alata – type locality for species
 * † Megousia alata
 * † Meristina – tentative report
 * † Meristina
 * † Meristina sp.
 * † Mesogondolella
 * † Mesogondolella bisselli
 * † Mesopholidostrophia
 * † Mesopholidostrophia sp.
 * † Metacrimites
 * † Metacrimites dunbari
 * † Metacrimites newelli
 * † Metacrimites plummeri – type locality for species
 * † Metaldetes
 * † Metaldetes fischeri – or unidentified comparable form
 * † Mexicaspis
 * † Mexicaspis difuntosensis
 * † Mexicaspis stenopyge
 * † Mexicella
 * † Mexicella mexicana
 * † Mexicoceras
 * † Mexicoceras guadalupense
 * † Michelinia
 * † Michelinia sp.
 * † Micragnostus
 * † Micragnostus curvata – type locality for species
 * † Micragnostus intermedius
 * † Microdictyon
 * † Microdictyon sp.
 * † Micromitra
 * † Micromitra sp.
 * † Millerella
 * † Millerella sp.
 * † Mizzia
 * † Mizzia sp.
 * † Mooreanteris
 * † Mooreanteris perforatus
 * † Mooreanteris waylandensis
 * † Myalina
 * † Myalina mieeki
 * † Myalina sp.
 * † Naticopsis – tentative report
 * † Naticopsis
 * † Naticopsis sp.
 * † Neocrimites
 * † Neocrimites sp.
 * † Neogeoceras
 * † Neogeoceras girtyi
 * † Neognathodus
 * † Neognathodus bothrops
 * † Neognathodus caudatus
 * † Neognathodus medadultimus
 * † Neognathodus sp.
 * † Neogondolella
 * † Neogondolella clarki
 * † Neospirifer
 * † Neospirifer amphigyus – or unidentified comparable form
 * † Neospirifer sp.
 * † Neospirifer sp. 1informal
 * † Neospirifer sp. 2informal
 * † Neozaphrentis
 * † Neozaphrentis tenella
 * † Neuropteris – or unidentified comparable form
 * † Neuropteris
 * † Neuropteris sp.
 * † Nevadia – or unidentified comparable form
 * † Nevadia sp.
 * † Nevadotheca
 * † Nevadotheca princeps – or unidentified related form
 * † Nevadotheca whitei
 * † Nipperella – tentative report
 * † Nipperella sp.
 * † Nisusia
 * † Nisusia sp.
 * † Nodosageceras
 * † Nodosageceras nodosum
 * † Nuanducosia
 * † Nuanducosia sulcata
 * † Nucleospira
 * † Nucleospira sp.
 * † Nucula – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Nucula sp.
 * † Nucula spp.
 * † Nuculopsis – tentative report
 * † Nuculopsis sp.
 * † Oaxaquiatreta – type locality for genus
 * † Oaxaquiatreta
 * † Oaxaquiatreta labrifera – type locality for species
 * † Oaxaquiatreta labrifera
 * † Oaxaquiatreta sp.
 * † Obliquipecten
 * † Obliquipecten sp.
 * † Odontopteris – or unidentified comparable form
 * † Odontopteris
 * † Odontopteris lingulata
 * † Odontopteris sp.
 * † Olenellus
 * † Olenellus fremonti
 * † Olenellus puertoblancoensis
 * † Olenllus
 * † Olenllus truemani
 * † Omphalotrochus – tentative report
 * † Omphalotrochus sp. Ainformal
 * † Onchocephalus
 * † Onchocephalus buelnaensis
 * † Onchocephalus mexicanus
 * † Oneotodus
 * † Oneotodus simplex
 * † Oneotodus tenuis
 * † Onychopyge
 * † Onychopyge sculptura – type locality for species
 * † Orbiculoidea
 * † Orbiculoidea ovalis – type locality for species
 * † Orbiculoidea sp.
 * † Orbiculoidea sp. 1informal
 * † Orbiculoidea sp. 2informal
 * † Orbiculoidea utahensis – or unidentified comparable form
 * † Orthonema
 * † Orthonema sp.
 * † Orthonychia
 * † Orthonychia sp.
 * † Orthonychia sp. Ainformal
 * † Orthotheca
 * † Orthotheca buelna
 * † Oryctocara
 * † Oryctocara sp.
 * † Oryctocephalus
 * † Oryctocephalus sp.
 * † Ottenbyella – tentative report
 * † Ottenbyella sp. Ainformal
 * † Ottenbyella sp. Binformal
 * † Oulodus
 * † Oulodus sp.
 * † Ovatia
 * † Ovatia muralis
 * † Ozarkodina
 * † Ozarkodina sp.
 * † Pachyaspis
 * † Pachyaspis deborra
 * † Pachyaspis isabella
 * † Pachyaspis sp.
 * † Pachysphaerina
 * † Pachysphaerina pachysphaerica
 * † Pagetia
 * † Pagetia sp.
 * † Palaeolima – tentative report
 * † Palaeolima sp.
 * † Palaeonucula – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Palaeonucula sp.
 * † Palaeophycus
 * † Palaeophycus sp.
 * † Palmericyathellus
 * † Palmericyathellus undatus – type locality for species
 * † Palmericyathus
 * † Palmericyathus americanus
 * † Parabolina
 * † Parabolina argentina – or unidentified comparable form
 * † Parabolinella
 * † Parabolinella argentinensis
 * † Parabolinella prolata – type locality for species
 * † Parabolinella tumifrons – type locality for species
 * † Parabolinella variabilis – type locality for species
 * † Paraceltites
 * † Paraceltites altudensis
 * † Paraceltites ornatus
 * † Paraceltites rectangularis – type locality for species
 * † Parachaetetes
 * † Parachaetetes sp.
 * † Parafusulina
 * † Parafusulina antimonioensis – type locality for species
 * † Parafusulina boesei – or unidentified related form
 * † Parafusulina bosei
 * † Parafusulina deliciasensis
 * † Parafusulina sellardsi
 * † Parafusulina sp.
 * † Parafusulina spissisepta
 * † Parallelodon
 * † Parallelodon sulcatus
 * † Parallelodon tenuistriatus
 * † Paramarginifera
 * † Paramarginifera sp.
 * † Paranacyathus
 * † Paranacyathus polycladus – type locality for species
 * † Paranacyathus polycladus
 * † Paranorella – type locality for genus
 * † Paranorella
 * † Paranorella imperialis – type locality for species
 * † Paranorella imperialis
 * † Pararachnastraea
 * † Pararachnastraea amsburyi – type locality for species
 * † Pararachnastraea dyeri – type locality for species
 * † Paraspiriferina
 * † Paraspiriferina convexa – type locality for species
 * † Parehmania
 * † Parehmania sp.
 * † Parethmophyllum
 * † Parethmophyllum cooperi
 * † Parspaniocrinus – type locality for genus
 * † Parspaniocrinus beinerti – type locality for species
 * † Paterina
 * † Paterina sp.
 * † Paucispinifera
 * † Paucispinifera sp.
 * † Pecopteris
 * † Pecopteris arborescens
 * † Pecopteris sp.
 * † Pecopteris unita
 * † Peltocare
 * † Peltocare norvegicum
 * † Peniculauris
 * † Peniculauris subcostata – or unidentified comparable form
 * † Pentagonopterix
 * † Pentagonopterix insculptus
 * † Pentamerus
 * † Pentamerus sp.
 * † Pentaridica
 * † Pentaridica simplicis
 * † Perditocardinia
 * † Perditocardinia dubia – or unidentified comparable form
 * † Permophorus
 * † Permophorus oblongus – or unidentified comparable form
 * † Permophorus sonorensis – type locality for species
 * † Permophorus sp.
 * † Permophorus spinulosa
 * † Peronopsis
 * † Peronopsis bonnerensis – or unidentified comparable form
 * † Peronopsis sp.
 * † Perrinites
 * † Perrinites hilli
 * † Phacistognathus
 * † Phacistognathus muricatus
 * † Pharostomina
 * † Pharostomina mexicana – type locality for species
 * † Plagioglypta
 * † Plagioglypta sp.
 * † Plagiogmus
 * † Plagiogmus sp.
 * † Planolites
 * † Planolites sp.
 * † Platyceras
 * † Platyceras sp.
 * † Platychisma
 * † Platychisma sp.
 * † Plectelasma
 * † Plectelasma guadalupense
 * † Pleurodictyum
 * † Pleurodictyum subramosum – type locality for species
 * † Pleurotomaria – tentative report
 * † Pleurotomaria sp. Ainformal
 * † Pleurotomaria sp. Binformal
 * † Pleurotomaria sp. Cinformal
 * † Plicatolinella
 * † Plicatolinella ocula – type locality for species
 * † Plicochonetes
 * † Plicochonetes geniculatus
 * † Poleumita
 * † Poleumita sp.
 * † Polidevcia
 * † Polidevcia obesa
 * † Polydiexodina
 * † Polydiexodina capitanensis
 * † Polydiexodina mexicana – type locality for species
 * † Polydiexodina shumardi
 * † Polydiexodina sp.
 * † Pontisia
 * † Pontisia stehlii – or unidentified related form
 * † Posidoniella
 * † Posidoniella sp.
 * † Praeskinnerella
 * † Praeskinnerella guembeli – or unidentified related form
 * † Preptopremnum
 * † Preptopremnum laeve
 * † Preptopremnum rugosum
 * † Prodentalium
 * † Prodentalium canna
 * † Promytilus
 * † Promytilus sp.
 * † Propinacoceras
 * † Propinacoceras sp.
 * † Prorichthofenia
 * † Prorichthofenia sp.
 * † Protopharetra
 * † Protopharetra sp.
 * † Prototreta
 * † Prototreta sp.
 * † Proveedoria
 * † Proveedoria startquistae
 * † Pseudagathiceras
 * † Pseudagathiceras difuntense
 * † Pseudagathiceras spinosum – type locality for species
 * † Pseudagnostus
 * † Pseudagnostus sp.
 * † Pseudomulceodens
 * † Pseudomulceodens cancellatus
 * † Pseudostaffella
 * † Pseudostaffella sp.
 * † Pseudovermiporella
 * † Pseudovermiporella sp.
 * † Ptarmigania
 * † Ptarmigania bispinosa
 * † Pterinopectinella
 * † Pterinopectinella sp.
 * † Ptychoparia
 * † Ptychoparia clusia – or unidentified related form
 * † Pugnoides – tentative report
 * † Pugnoides sp.
 * † Punctospirifer
 * † Punctospirifer gigas
 * † Punctospirifer globosa
 * † Punctospirifer sp.
 * † Punctospirifer sulcifer – type locality for species
 * † Pycnoidocyathus
 * † Pycnoidocyathus eminetus – type locality for species
 * † Pywackia – type locality for genus
 * † Pywackia baileyi – type locality for species
 * † Quadrochonetes
 * † Quadrochonetes girtyi – or unidentified related form
 * † Quadrochonetes girtyi – or unidentified comparable form
 * † Rauserella – type locality for genus
 * † Rauserella
 * † Rauserella erratica – type locality for species
 * † Rauserella erratica
 * † Renalcis
 * † Renalcis sp.
 * † Resserella
 * † Resserella sp.
 * † Reticularia
 * † Reticularia cooperensis
 * † Reticulariina
 * † Reticulariina laxa
 * † Reticulariina sonorensis – type locality for species
 * † Reticulariina sonorensis
 * † Reticulatia
 * † Reticulatia sp.
 * † Retilamina
 * † Retilamina sp.
 * † Rhineoderma
 * † Rhineoderma nystii – or unidentified comparable form
 * † Rhipidomella
 * † Rhipidomella missouriensis – or unidentified comparable form
 * † Rhynchonella
 * † Rhynchonella stricklandi – or unidentified related form
 * † Rhynchopora
 * † Rhynchopora bicostata – type locality for species
 * † Rhynchopora sp.
 * † Rhynchopora taylori
 * † Richardsonella
 * † Richardsonella variagranula – type locality for species
 * † Rioceras
 * † Rioceras minore
 * † Rioceras oxacaense
 * † Roadoceras
 * † Roadoceras haacki
 * † Roadoceras roadense
 * † Rotiphyllum
 * † Rotiphyllum occidentale – type locality for species
 * † Rotiphyllum vesiculosum – type locality for species
 * † Rotundocyathus – tentative report
 * † Rotundocyathus pusillus – type locality for species
 * † Rotundocyathus pusillus
 * † Rusophycus
 * † Rusophycus sp.
 * † Ruzhencevispongus
 * † Ruzhencevispongus sp.
 * † Salterella
 * † Salterella maccullochi
 * † Salterella pulchella – or unidentified comparable form
 * † Salterella sp.
 * † Sanguinolites – tentative report
 * † Sanguinolites
 * † Sanguinolites sp.
 * † Saukia
 * † Saukia globosa – type locality for species
 * † Scenella
 * † Scenella reticulata – or unidentified comparable form
 * † Schellwienella
 * † Schellwienella umbonata – type locality for species
 * † Schizodus
 * † Schizodus parvulus – type locality for species
 * † Schizodus parvulus
 * † Schizodus sp.
 * † Schizodus texanus
 * † Schizodus ulrichi – or unidentified comparable form
 * † Schizophoria
 * † Schizophoria sulcata – type locality for species
 * † Schuchertella
 * † Schuchertella sp.
 * † Schwagerina
 * † Schwagerina crassitectoria
 * † Schwagerina sp.
 * † Scolicia
 * † Scolicia sp.
 * † Scytinoptera
 * † Scytinoptera mexicana – type locality for species
 * † Semitreta
 * † Semitreta sp.
 * † Septimyalina
 * † Septimyalina burmai
 * † Septimyalina sp.
 * † Serpulospira
 * † Serpulospira paradoxus – or unidentified comparable form
 * † Sestropoma
 * † Sestropoma mexicanum – type locality for species
 * † Shamovella
 * † Shamovella sp.
 * † Shumardia
 * † Shumardia alata – type locality for species
 * † Shumardia ctenata – type locality for species
 * † Sinotubulites – tentative report
 * † Sinotubulites
 * † Sinotubulites cienegensis – type locality for species
 * † Sinotubulites cienegensis
 * † Sinotubulites sp.
 * † Sinuatella – tentative report
 * † Sinuatella sp.
 * † Skenidioides
 * † Skenidioides sp.
 * † Skolithos
 * † Skolithos sp.
 * † Solenomorpha – tentative report
 * † Solenomorpha sp.
 * † Solenopora
 * † Solenopora texana
 * † Sombrerella
 * † Sombrerella mexicana
 * † Sphaerirhynchia
 * † Sphaerirhynchia sp.
 * † Sphaerocodium
 * † Sphaerocodium sp.
 * † Sphenopteris – tentative report
 * † Sphenopteris sp.
 * † Spirifer
 * † Spirifer sp.
 * † Spiriferella – tentative report
 * † Spiriferella
 * † Spiriferella propria
 * † Spiriferella scobinoidea – type locality for species
 * † Spiriferella scobinoidea
 * † Spiriferella sp. 1informal
 * † Spiriferellina
 * † Spiriferellina hilli
 * † Spiriferellina sp.
 * † Spiriferellina sp. 2informal
 * † Spiriferellina tricosa – or unidentified comparable form
 * † Spiriferellina tricosa
 * † Stachella
 * † Stachella sp.
 * † Stacheoceras
 * † Stacheoceras gemmellaroi – type locality for species
 * † Stacheoceras gemmellaroi
 * † Stacheoceras toumanskayae
 * † Staffella
 * † Staffella fountaini
 * † Staffella powwowensis
 * † Staffella subacuta
 * † Stearoceras
 * † Stearoceras sp.
 * † Stenopareia
 * † Stenopareia sp. – type locality for species
 * † Stenoscisma
 * † Stenoscisma indentata
 * † Stenoscisma kingi – type locality for species
 * † Stenoscisma sp.
 * † Stevocyathus – type locality for genus
 * † Stevocyathus elictus – type locality for species
 * † Straparollus – tentative report
 * † Straparollus
 * † Straparollus sp.
 * † Straparollus sp. Ainformal
 * † Streblochondria
 * † Streblochondria sculptilis
 * † Streblopteria
 * † Streblopteria montpelierensis
 * † Streblopteria sp.
 * † Streptognathodus
 * † Streptognathodus bellus
 * † Streptognathodus sp.
 * † Streptorhynchus
 * † Streptorhynchus sp.
 * † Strigogoniatites
 * † Strigogoniatites kingi – type locality for species
 * † Strobeus
 * † Strobeus welleri – or unidentified comparable form
 * † Strophonella – tentative report
 * † Strophonella
 * † Strophonella euglypha – or unidentified comparable form
 * † Strophonella sp.
 * † Sweetina – tentative report
 * † Sweetina
 * † Sweetina sp.
 * † Sweetognathus
 * † Sweetognathus whitei
 * † Syringocnema – tentative report
 * † Syringocnema sp.
 * † Syringopora
 * † Syringopora sp. – type locality for species
 * † Syringopora tubifera – type locality for species
 * † Syringothyris – tentative report
 * † Syringothyris
 * † Syringothyris sp.
 * † Syringothyris typa – or unidentified comparable form
 * † Taeniopteris
 * † Taeniopteris sp.
 * † Tapuritreta
 * † Tapuritreta reclinata – type locality for species
 * † Texarina
 * † Texarina wordensis
 * † Thamnosia
 * † Thamnosia depressa – type locality for species
 * † Thamnosia depressa
 * † Timaniella
 * † Timaniella pseudocamerata – or unidentified comparable form
 * † Timaniella pseudocamerata
 * † Timorites
 * † Timorites schucherti
 * † Timorites sp.
 * † Tinaspis
 * † Tinaspis totoyaca – type locality for species
 * † Torynifer
 * † Torynifer pseudolineatus
 * † Trachydomia
 * † Trachydomia sp.
 * † Treptichnus
 * † Treptichnus pedum
 * † Tribloceras
 * † Tribloceras digonum
 * † Triticites
 * † Triticites cullomensis
 * † Triticites piloncillosensis – type locality for species
 * † Triticites sp.
 * † Trochophyllum
 * † Trochophyllum sp.
 * † Tropidelasma
 * † Tropidelasma gregarium – or unidentified comparable form
 * † Tropidodiscus
 * † Tropidodiscus sp.
 * † Tumulocyathellus
 * † Tumulocyathellus minor – type locality for species
 * † Tylothyris – tentative report
 * † Tylothyris sp.
 * † Uncinulinoides
 * † Uncinulinoides indentatus – or unidentified comparable form
 * † Uncinunellina – tentative report
 * † Uncinunellina pulchra – type locality for species
 * † Uncinunellina pulchra
 * † Validopteris
 * † Validopteris sp.
 * † Waagenoceras
 * † Waagenoceras dieneri
 * † Waagenoceras girtyi
 * † Waagenoceras karpinskyi – type locality for species
 * † Waagenoceras karpinskyi
 * † Waagenoconcha
 * † Waagenoconcha sp.
 * † Walchia – or unidentified comparable form
 * † Walchia
 * † Walchia sp.
 * † Wanneria – tentative report
 * † Wanneria
 * † Wanneria mexicana
 * † Wanneria sp.
 * † Wanneria walcottana
 * † Warthia
 * † Warthia sp.
 * † Warthia sp. Ainformal
 * † Wellerella
 * † Wellerella hemiplicata – type locality for species
 * † Wellerella hemiplicata
 * † Wellerella lemasi – type locality for species
 * † Wellerella lemasi
 * † Wellerella rotunda – type locality for species
 * † Wellerella sp.
 * † Wimanella
 * † Wimanella sp.
 * † Worthenia – tentative report
 * † Worthenia
 * † Worthenia crenulata – or unidentified comparable form
 * † Worthenia sp.
 * † Xenodiscus
 * † Xenodiscus wanneri
 * † Xestosia
 * † Xestosia schucherti
 * † Yakovlevia
 * † Yakovlevia deminutiva
 * † Yakovlevia sp.
 * † Yogelgnathus
 * † Yogelgnathus postcampbelli
 * † Zacanthoides
 * † Zacanthoides holopygus – or unidentified related form
 * † Zidella – tentative report
 * † Zidella sp.

Mesozoic

 * † Acaeniotyle
 * † Acaeniotyle parva
 * † Acaeniotyle umbilicata
 * † Acanthoceras
 * † Acanthoceras camachoense
 * † Acanthoceras camattei – or unidentified comparable form
 * † Acanthoceras sp.
 * † Acanthocircus
 * † Acanthocircus minimus – or unidentified comparable form
 * † Acanthocircus minispineus
 * † Acanthocircus moctezumaensis – or unidentified comparable form
 * † Acanthocircus moctezumaensis
 * † Acanthocircus sp.
 * † Acanthocircus sp. Ainformal
 * † Acanthocircus sp. Binformal
 * † Acanthocircus trizonalis – tentative report
 * † Acanthocircus yaoi
 * † Acanthocoenia
 * † Acanthocoenia neocomiensis
 * † Acanthodiscus – or unidentified comparable form
 * † Acanthodiscus
 * † Acanthodiscus magnificus – or unidentified comparable form
 * † Acanthodiscus magnificus
 * † Acanthodiscus radiatus
 * † Acanthohoplites
 * † Acanthohoplites abichiaff.
 * † Acanthohoplites aschiltaensis
 * † Acanthohoplites ashiltaensisaff.
 * † Acanthohoplites crassicostatusaff.
 * † Acanthohoplites gragasensisaff.
 * † Acanthohoplites janneliaff.
 * † Acanthohoplites potreritensis
 * † Acanthohoplites sp.informal
 * † Acanthohoplites sp.
 * † Acanthohoplites uhligi – or unidentified comparable form
 * † Acanthoxenophora – type locality for genus
 * † Acanthoxenophora
 * † Acanthoxenophora sinuosa – type locality for species
 * † Acanthoxenophora sinuosa
 * † Acastea
 * † Acastea acer
 * † Acastea bipes
 * † Acastea duraaff.
 * † Acastea dura – or unidentified comparable form
 * † Acastea dura
 * † Acastea minispinea
 * † Acastea prolixa
 * † Acicularia
 * † Acicularia americana
 * † Acila
 * † Acila demessa
 * † Acila princeps
 * † Acrioceras
 * † Acrioceras sp.
 * † Acrosmilia
 * † Acrosmilia minima
 * † Acteonella
 * † Acteonella borneensis
 * † Acteonella fusiformis
 * † Acteonella parvus
 * † Acteonella robinsoni
 * † Acteonina
 * † Acteonina tehuacanensis
 * † Actinacis
 * † Actinacis haueri
 * † Actinacis magna
 * † Actinacis martiniana
 * † Actinaraea
 * † Actinaraea michoacanensis – type locality for species
 * † Actinastraea
 * † Actinastraea pseudominima
 * † Actinastrea
 * † Actinastrea bernensis
 * † Actinastrea guadalupae
 * † Actinastrea lacvivieri – type locality for species
 * † Actinastrea reticulata
 * † Actinastrea sp.
 * † Actinastrea tenuisepta
 * † Actinhelia
 * † Actinhelia elegans
 * † Actinostreon
 * † Actinostreon gregareum
 * † Actinostromaria
 * † Actinostromaria sp.
 * † Acusten
 * † Acusten ordinarium
 * † Adelodonex
 * † Adelodonex altus
 * † Adocus
 * † Adocus sp.
 * † Aeger
 * † Aeger hidalguensis – type locality for species
 * † Aesculiidites
 * † Aesculiidites sp.
 * † Agathelia
 * † Agathelia urgonica
 * † Agathodonta
 * † Agathodonta brooksi
 * † Agerchlamys
 * † Agerchlamys wunschae
 * † Akatopora
 * † Akatopora sp.
 * † Aklydonion
 * † Aklydonion murrayae
 * † Albertosaurus – or unidentified comparable form
 * † Albertosaurus sp.
 * † Alethopteris
 * † Alethopteris sp.
 * † Alethopteris whitneyi
 * † Alexornis – type locality for genus
 * † Alexornis antecedens – type locality for species
 * † Algericeras
 * † Algericeras proratum
 * † Algericeras remolinense – type locality for species
 * † Alpinophragmum – or unidentified comparable form
 * † Alpinophragmum sp.
 * † Alpinophyllia
 * † Alpinophyllia flexuosa
 * † Alveosepta
 * † Alveosepta jaccardi
 * † Amaea
 * † Amaea sp.
 * † Amaurellina
 * † Amaurellina guerrera
 * † Amauropsis
 * † Amauropsis bulbiformis – or unidentified comparable form
 * † Amauropsis japonica
 * † Ammodiscus
 * † Ammodiscus incertus
 * † Ammonites
 * † Ammonites oolithicus – or unidentified comparable form
 * † Ammonites sp.
 * † Ammonites subradiatus – or unidentified comparable form
 * † Ammonites subradiatus
 * † Amphekepubis – type locality for genus
 * † Amphekepubis johnsoni – type locality for species
 * † Amphiastrea
 * † Amphiastrea aethiopica
 * † Amphibrachium
 * † Amphibrachium petersoni
 * † Amphidonte
 * † Amphidonte obliquata
 * † Amphidonte sp.
 * † Amphitriscoelus
 * † Amphitriscoelus pluriloculata
 * † Amphitriscoelus waringi
 * † Amphiuraaff.
 * † Amphiura sp.
 * † Ampullina
 * † Ampullina lepta – or unidentified comparable form
 * † Anahamulina
 * † Anahamulina sp.
 * † Anaticapitula – tentative report
 * † Anaticapitula anatiformis
 * † Anatina
 * † Anatina sp.
 * † Anchura – tentative report
 * † Anchura
 * † Anchura andersoni
 * † Anchura denticulata – type locality for species
 * † Anchura gibbera – type locality for species
 * † Anchura gibbera
 * † Anchura hannai
 * † Anchura johnsoni
 * † Anchura sp.
 * † Ancyloceras – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Ancyloceras
 * † Ancyloceras camachoense
 * † Ancyloceras matheroni – or unidentified comparable form
 * † Ancyloceras sp.
 * † Ancyloceras vandenheckii
 * † Ancyloceras zacatecanum
 * † Andiceras
 * † Andiceras monserrati
 * † Angaria
 * † Angaria gwynae
 * † Anglonautilus
 * † Anglonautilus catarinae – type locality for species
 * † Anglonautilus catarinae
 * † Angulaticeras – tentative report
 * † Angulaticeras sp.
 * † Animonithyris
 * † Animonithyris dorenbergi
 * † Anisoceras
 * † Anisoceras armatum – or unidentified comparable form
 * † Anisoceras neohispanicum
 * † Ankylosphenodon – type locality for genus
 * † Ankylosphenodon pachyostosus – type locality for species
 * † Anomia
 * † Anomia mexicana
 * † Anomia micronema
 * † Anomia sp.
 * † Anomozamites
 * † Anomozamites sp.
 * † Anthostylis
 * † Anthostylis acanthophora
 * † Anthostylis sp.
 * † Antiguastrea
 * † Antiguastrea cellulosa
 * † Antillocaprina
 * † Antillocaprina trilobata – type locality for species
 * † Antillocaprina trilobata
 * † Antiptychina – tentative report
 * † Antiptychina
 * † Antiptychina formosa
 * † Antiptychina lata
 * † Antiptychina milleriedi
 * † Antiptychina muellerriedi
 * † Antiquilima
 * † Antiquilima nodulosa – or unidentified comparable form
 * † Aphaea
 * † Aphaea leia
 * † Aphlebia
 * † Aphlebia sonorensis
 * † Aphrodina
 * † Aphrodina tippana
 * † Apocladophyllia
 * † Apocladophyllia birleyae
 * † Aporrhais – tentative report
 * † Aporrhais
 * † Aporrhais sp.
 * † Aporrhais subfusiformisaff.
 * † Aptyxiella
 * † Aptyxiella boehmi
 * † Aptyxiella parallela
 * † Aptyxiella subula – or unidentified comparable form
 * † Aptyxiella subula
 * † Arabicodium
 * † Arabicodium texana
 * † Araripichthys
 * † Araripichthys weberi – type locality for species
 * † Araucaria – or unidentified comparable form
 * † Araucaria sp.
 * † Araucarioxylon
 * † Araucarioxylon mexicana
 * † Araucarioxylon sp.
 * † Arca
 * † Arca sp.
 * † Arcestes
 * † Arcestes sp.
 * † Archaeocenosphaera
 * † Archaeocenosphaera ruesti
 * † Archaeodictyomitra
 * † Archaeodictyomitra shengi
 * † Archaeodictyomitra sixi
 * † Archaeodictyomitra sp.
 * † Archaeodictyomitra wangi
 * † Archaeohagiastrum
 * † Archaeohagiastrum exile
 * † Archaeohagiastrum minutum – or unidentified comparable form
 * † Archaeoniscus
 * † Archaeoniscus aranguthyorum
 * † Archaeopus
 * † Archaeopus mexicanus – type locality for species
 * † Archaeopus mexicanus
 * † Archaeospongoprunum
 * † Archaeospongoprunum coyotense – type locality for species
 * † Archaeospongoprunum coyotense
 * † Arcomytilus
 * † Arcomytilus sp.
 * † Arctica – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Arctica – or unidentified comparable form
 * † Arctica
 * † Arctica bernensis
 * † Arctica sanzi
 * † Arctica sp.
 * † Arctotis
 * † Arctotis cretacea
 * † Arecipites
 * † Arecipites sp.
 * † Ares
 * † Ares cuniculiformis
 * † Ares mexicoensis – type locality for species
 * † Ares sutherlandi
 * † Astacodes
 * † Astacodes sp.
 * † Astacolus
 * † Astacolus nuda
 * † Astarte
 * † Astarte antipodum – or unidentified comparable form
 * † Astarte durangensis
 * † Astarte gracilicostula
 * † Astarte similis
 * † Astarte sp.
 * † Astarte subcostata
 * † Astartemya
 * † Astartemya sp.
 * † Asterotheca
 * † Asterotheca meriani
 * † Asterotheca santaclaraeex gr.
 * † Asterotheca santaclarae
 * † Asterotheca sp.
 * † Astieria
 * † Astieria astieriformis
 * † Astieria bangei
 * † Astieria neohispanica
 * † Astieria raricostata
 * † Astraeofungia
 * † Astraeofungia felixi
 * † Astraeomorpha
 * † Astraeomorpha sonorensis – type locality for species
 * † Astraeomorpha sonorensis
 * † Astrocoenia
 * † Astrocoenia sp.
 * † Atalantria
 * † Atalantria emmela
 * † Atalantria sp.informal
 * † Atocatle – type locality for genus
 * † Atocatle ranulfoi – type locality for species
 * † Atreta
 * † Atreta sp.
 * † Audienusina
 * † Audienusina fourcadei
 * † Aulacomyella
 * † Aulacomyella neogeae
 * † Aulastraeopora
 * † Aulastraeopora harrisi
 * † Aulastraeopora sp.
 * † Avicula
 * † Avicula sp.
 * † Axelrodichthys
 * † Axelrodichthys araripensis – or unidentified comparable form
 * † Baculites
 * † Baculites haresi
 * † Baculites occidentalisaff.
 * † Baculites sp.
 * † Baculites sp. 2informal
 * † Baculites taylorensis
 * † Baculites yokoyamai
 * † Bagotum
 * † Bagotum funiculum – type locality for species
 * † Bagotum funiculum
 * † Bagotum helmetense
 * † Bagotum kimbroughi – type locality for species
 * † Bagotum kimbroughi
 * † Bagotum modestum
 * † Bairdia
 * † Bairdia sp.
 * † Bakevellia
 * † Bakevellia sp. Ainformal
 * † Balanocrinus
 * † Balanocrinus mexicanus
 * † Barrettia
 * † Barrettia gigas
 * † Barrettia monilifera
 * † Barrettia multilirata
 * † Barrettia ruseae – or unidentified comparable form
 * † Barroisiceras
 * † Barroisiceras alstadenense – or unidentified comparable form
 * † Barroisiceras sp.
 * † Baryphyllia
 * † Baryphyllia confusa – type locality for species
 * † Baryphyllia confusa
 * † Barysmilia
 * † Barysmilia trechmanni
 * † Beatricea – tentative report
 * † Beatricea
 * † Beatricea baroni
 * † Beatricea christovalensis
 * † Beatricea sanpabloensis – type locality for species
 * † Beatricea sanpabloensis
 * † Belemnites
 * † Belemnites sp.
 * † Belenostomus
 * † Belenostomus sp.
 * † Bellifusus
 * † Bellifusus curvicostatus
 * † Belliscala
 * † Belliscala sp.
 * † Berriasella – tentative report
 * † Berriasella sp.
 * † Betraccium
 * † Betraccium smithi – type locality for species
 * † Betraccium smithi
 * † Beudanticeras
 * † Beudanticeras beudanti
 * † Biradiolites
 * † Biradiolites cancellatus
 * † Biradiolites rudissimus
 * † Biradiolites sp.
 * † Bivallupus
 * † Bivallupus longoriai
 * † Bivallupus mexicanusaff.
 * † Bivallupus mexicanus
 * † Bivallupus oppositus
 * † Bivallupus primigenius
 * † Bivallupus sp.
 * † Blanforidceras – tentative report
 * † Blanforidceras sp.
 * † Blastozopsammia – type locality for genus
 * † Blastozopsammia guerreroterion – type locality for species
 * † Bocaconodon – type locality for genus
 * † Bocaconodon tamaulipensis – type locality for species
 * † Bocatherium
 * † Bocatherium mexicanum – type locality for species
 * † Bochianites – tentative report
 * † Bochianites
 * † Bochianites sp.
 * † Bolivinoides
 * † Bolivinoides draco
 * † Bostrychoceras
 * † Bostrychoceras polyplocum
 * † Bournonia
 * † Bournonia cardenasensis
 * † Brachymeandra
 * † Brachymeandra sp.
 * † Brachyphyllum
 * † Brachyphyllum sp.
 * † Brachyseris
 * † Brachyseris chellalensis
 * † Branchiocarcinus
 * † Branchiocarcinus cornatus
 * † Brasilichnium – or unidentified comparable form
 * † Brasilichnium sp.
 * † Buccicrenata
 * † Buccicrenata subgoodlandensis
 * † Buchia
 * † Buchia concentrica
 * † Buchotrigonia
 * † Buchotrigonia reesidei
 * † Budaiceras
 * † Budaiceras hyatti
 * † Burckhardtites
 * † Burckhardtites ehlersi
 * † Burckhardtites nazasensis
 * † Burckhardtites sp.
 * † Caenocidaris
 * † Caenocidaris cucumifera – or unidentified comparable form
 * † Caestocorbula
 * † Caestocorbula crassiplica
 * † Calamophylliopsis
 * † Calamophylliopsis fotisalensis – or unidentified comparable form
 * † Calcisphaerula
 * † Calcisphaerula innomiata
 * † Callianassa – or unidentified comparable form
 * † Callianassa
 * † Callianassa sp.
 * † Callianassa tepetatensis
 * † Calliconites
 * † Calliconites drakei – or unidentified comparable form
 * † Calliconites milleri – type locality for species
 * † Calliomphalus
 * † Calliomphalus argenteus
 * † Calliomphalus decoris – or unidentified comparable form
 * † Calliomphalus mexcalensis
 * † Calliomphalus sp.
 * † Calliostoma
 * † Calliostoma craginiaff.
 * † Calva
 * † Calva crassa
 * † Calva peninsularis
 * † Calva sp.
 * † Calycoceras
 * † Calycoceras sp.
 * † Calyptraphorus – tentative report
 * † Calyptraphorus sp.
 * † Camptodocis
 * † Camptodocis araneola – or unidentified comparable form
 * † Camptonectes
 * † Camptonectes sp.
 * † Cancellaria
 * † Cancellaria sp.
 * † Caneta
 * † Caneta hsui – or unidentified comparable form
 * † Canoptum
 * † Canoptum anulatum
 * † Canoptum dixoni
 * † Canoptum pessagnoi
 * † Canoptum sp.
 * † Cantalum
 * † Cantalum holdsworthi – type locality for species
 * † Cantalum holdsworthi
 * † Canutus – tentative report
 * † Canutus
 * † Canutus bolesi – type locality for species
 * † Canutus diegoi – type locality for species
 * † Canutus diegoi
 * † Canutus rockfishensisaff.
 * † Capnodoce
 * † Capnodoce crystallina – type locality for species
 * † Capnodoce crystallina
 * † Capnodoce primaria – type locality for species
 * † Capnodoce primaria
 * † Capnodoce sp.
 * † Capnodoce venusta – type locality for species
 * † Capnodoce venusta
 * † Capnuchosphaera
 * † Capnuchosphaera lenticulata – type locality for species
 * † Capnuchosphaera lenticulata
 * † Capnuchosphaera mexicanaaff.
 * † Capnuchosphaera mexicana – type locality for species
 * † Capnuchosphaera mexicana
 * † Capnuchosphaera sp.
 * † Caprina
 * † Caprina massei – type locality for species
 * † Caprina massei
 * † Caprina sp.
 * † Caprinuloidea – tentative report
 * † Caprinuloidea
 * † Caprinuloidea costata
 * † Caprinuloidea gracilis
 * † Caprinuloidea perfecta
 * † Caprinuloidea sp.
 * † Carcharias
 * † Carcharias sp.
 * † Carcineretes
 * † Carcineretes planetarius
 * † Carcineretes plantarius
 * † Cardinia – tentative report
 * † Cardinia
 * † Cardinia concinna
 * † Cardinia sp. Ainformal
 * † Cardinioides
 * † Cardinioides sp.
 * † Cardium
 * † Cardium costae
 * † Cardium cottaldinum – or unidentified comparable form
 * † Cardium sp.
 * † Cardium sp. Ainformal
 * † Cardium sp. Binformal
 * † Carterwhalenia – tentative report
 * † Carterwhalenia minai – type locality for species
 * † Carterwhalenia minai
 * † Carya
 * † Carya sp.
 * † Cassiope
 * † Cassiope gwynae
 * † Cassiope kleinpelli
 * † Cassiope muellerriedi
 * † Cassiope renevieri – or unidentified comparable form
 * † Cassiope suturosa
 * † Cataceramus – tentative report
 * † Cataceramus barabini – or unidentified comparable form
 * † Cataceramus subcircularis – or unidentified comparable form
 * † Cayeuxia
 * † Cayeuxia kurdistanensis
 * † Cenomanocarcinus
 * † Cenomanocarcinus sp.
 * † Cenomanocarcinus vanstraeleni
 * † Cephalotaxopsis
 * † Cephalotaxopsis carolinensis
 * † Ceratobulimina
 * † Ceratobulimina woodi
 * † Ceratomya – tentative report
 * † Ceratomya
 * † Ceratomya concentrica
 * † Ceratomya petricosa
 * † Ceratomya sp.
 * † Ceratophyllum
 * † Ceratophyllum lesii – type locality for species
 * † Ceratosphinctes
 * † Ceratosphinctes rachistrophus
 * † Ceratotuberculus
 * † Ceratotuberculus linguituberculatusaff.
 * † Ceratotuberculus linguituberculatus
 * † Cercomya
 * † Cercomya durangensis
 * † Cercomya peruviana
 * † Cerithiella
 * † Cerithiella aequalirata
 * † Cerithiella kickapooense – tentative report
 * † Cerithiella nodoliratum
 * † Cerithiopsis – tentative report
 * † Cerithiopsis stantoni
 * † Cerithium – tentative report
 * † Cerithium
 * † Cerithium bustamantii
 * † Cerithium emersoni
 * † Cerithium nodosa
 * † Cerithium puebloensis
 * † Charentia
 * † Charentia cuvillieri – or unidentified comparable form
 * † Charlottea
 * † Charlottea sp. Ainformal
 * † Chedighaii
 * † Chedighaii hutchisoni
 * † Cheirolepis – tentative report
 * † Cheirolepis sp.
 * † Cheloniceras
 * † Cheloniceras buxtorfi – or unidentified comparable form
 * † Cheloniceras fossae
 * † Cheloniceras inconstans
 * † Cheloniceras sp.
 * † Cheloniceras subnodocostatumaff.
 * † Cheloniceras subnodocostatum – or unidentified comparable form
 * † Cheloniceras tschernyschewi
 * † Chenopodipollis
 * † Chenopodipollis sp.
 * † Chenopus
 * † Chenopus sp.
 * † Cheramus
 * † Cheramus sp.
 * † Chiapasella
 * † Chiapasella radiolitiformis
 * † Chiloscyllium
 * † Chiloscyllium sp.
 * † Chinamecaceras
 * † Chinamecaceras maldonadoi
 * † Chlamys
 * † Chlamys sp.
 * † Choffatella
 * † Choffatella tingitana – or unidentified comparable form
 * † Chondrites
 * † Chondrites sp.
 * † Chondrocoenia
 * † Chondrocoenia waltheri
 * † Chondrodonta
 * † Chondrodonta munsoni
 * † Choristoceras
 * † Choristoceras nobile – or unidentified comparable form
 * † Choristoceras sp.
 * † Cibicides – tentative report
 * † Cibicides sp.
 * † Cimolithium
 * † Cimolithium eleanorae
 * † Cimolithium miyakoense
 * † Cinnabaria
 * † Cinnabaria expansa
 * † Cirsochilus
 * † Cirsochilus gilberti
 * † Cladocora
 * † Cladocora cracilis
 * † Cladocora gracilis
 * † Cladocora jamaicaensis
 * † Cladocoropsis
 * † Cladocoropsis mirabilis
 * † Cladophlebis – tentative report
 * † Cladophlebis
 * † Cladophlebis browniana
 * † Cladophlebis mexicana
 * † Cladophlebis sp.
 * † Cladophlebis spp.
 * † Cladophyllia
 * † Cladophyllia dichotoma
 * † Cladophyllia mexicana – type locality for species
 * † Cladophyllia miroi
 * † Cladophyllia stewartae
 * † Classopolis
 * † Classopolis sp.
 * † Clidastes
 * † Clidastes sp.
 * † Cliona
 * † Cliona sp.
 * † Coahuilacarpon – type locality for genus
 * † Coahuilacarpon phytolaccoides – type locality for species
 * † Coahuilaceratops – type locality for genus
 * † Coahuilaceratops magnacuerna – type locality for species
 * † Coahuilites
 * † Coahuilites cavinsi
 * † Coahuilites orynskii – type locality for species
 * † Coahuilites sheltoni
 * † Coahuiloxylon – type locality for genus
 * † Coahuiloxylon terrazasiae – type locality for species
 * † Coalcomana
 * † Coalcomana ramosa – or unidentified comparable form
 * † Coalcomana ramosa
 * † Coalcomana sp.
 * † Coalcomana spp.
 * † Coilopoceras
 * † Coilopoceras colleti
 * † Coilopoceras requienianum
 * † Coilopoceras sp.
 * † Coilopoceras springeri
 * † Collignoniceras
 * † Collignoniceras woollgari
 * † Colombiceras
 * † Colombiceras sp.
 * † Colombiceras spathi
 * † Colomiella
 * † Colomiella tunisiana
 * † Columactinastraea
 * † Columactinastraea hilli
 * † Columactinastraea sp.
 * † Columastrea
 * † Columastrea indica – type locality for species
 * † Columastrea indica
 * † Columnocoenia
 * † Columnocoenia bucovinensis
 * † Columnocoenia ksiazkiewiczi
 * † Columnocoenia minima – type locality for species
 * † Compsemys
 * † Compsemys sp.
 * † Compsemys victa
 * † Coniopteris – or unidentified comparable form
 * † Coniopteris
 * † Coniopteris arguta
 * † Coniopteris hymenophylloides
 * † Coniopteris sp.
 * † Contusotruncana
 * † Contusotruncana fornicata
 * † Contusotruncana plicata
 * † Coralliochama
 * † Coralliochama gboehmi
 * † Coralliochama gbohemi
 * † Coralliochama orcutti
 * † Coralliochama sp.
 * † Corbicula
 * † Corbicula astartoides
 * † Corbula
 * † Corbula paracrassa – or unidentified comparable form
 * † Corbula sp.
 * † Cossmannea
 * † Cossmannea pauli
 * † Costacopluma
 * † Costacopluma bishopi
 * † Costacopluma mexicana
 * † Costatoria – tentative report
 * † Costatoria sp.
 * † Craginia
 * † Craginia floresi – type locality for species
 * † Craginia floresi
 * † Crassatella
 * † Crassatella sanchezi
 * † Crassatella sp.
 * † Crassatella vadosa
 * † Cremnoceramus
 * † Cremnoceramus crassus
 * † Cremnoceramus deformis
 * † Cremnoceramus waltersdorfensis
 * † Crenella
 * † Crenella elegantula
 * † Crenella santana
 * † Crenella serica
 * † Cretacoranina
 * † Cretacoranina dichrous
 * † Cretolamna
 * † Cretolamna sp.
 * † Cretorectolobus
 * † Cretorectolobus sp.
 * † Cricosaurus – type locality for genus
 * † Cricosaurus
 * † Cricosaurus saltillense – type locality for species
 * † Cricosaurus saltillensis – type locality for species
 * † Cricosaurus vignaudi – type locality for species
 * † Crioceratites
 * † Crioceratites sp.
 * † Crocodileimus – or unidentified comparable form
 * † Crocodileimus sp.
 * † Crucella – tentative report
 * † Crucella
 * † Crucella bisulca
 * † Crucella kaisunensis
 * † Crucella magna
 * † Crucella messinae
 * † Crucella mexicana
 * † Crucella mirabunda – type locality for species
 * † Crucella mirabunda
 * † Crucella mystica
 * † Crucella sp. Ainformal
 * † Crucella sp. Binformal
 * † Crucella squama
 * † Crucella theokaftensis
 * † Cryptocoenia
 * † Cryptocoenia aguilerai – type locality for species
 * † Cryptocoenia antiqua
 * † Cryptocoenia bulgarica
 * † Cryptocoenia corbariensis
 * † Cryptocoenia neocomiensis
 * † Cryptocoenia pygmaeaaff.
 * † Cryptocoenia regularis
 * † Ctenophylllum
 * † Ctenophylllum braunianum
 * † Ctenophyllum
 * † Ctenophyllum braunianum
 * † Ctenostreon
 * † Ctenostreon sp. Ainformal
 * † Cucullaeaaff.
 * † Cucullaea
 * † Cucullaea gabrielis
 * † Cucullaea gratiota
 * † Cucullaea mathewsonii
 * † Cucullaea sp.
 * † Cucullaea striatiumbonata
 * † Cuifastraea
 * † Cuifastraea granulata
 * † Cuneolina
 * † Cuneolina parva
 * † Cuneolina walteri – or unidentified comparable form
 * † Cyathophora
 * † Cyathophora atempa
 * † Cyathophora hayensis
 * † Cyathophora haysensis
 * † Cyathophora micrommatos
 * † Cyathophora miyakoensis
 * † Cyathophora sp.
 * † Cyathoseris
 * † Cyathoseris catadupensis
 * † Cyathoseris formosa
 * † Cycadolepis
 * † Cycadolepis mexicana
 * † Cycadolepis wettsteiniaff.
 * † Cycadolepis wettsteini
 * † Cyclastrum
 * † Cyclastrum asuncionense – type locality for species
 * † Cyclastrum asuncionense
 * † Cyclastrum scammonense – type locality for species
 * † Cyclastrum scammonense
 * † Cyclastrum veracruzense – type locality for species
 * † Cyclastrum veracruzense
 * † Cyclorisma
 * † Cyclorisma sp.
 * † Cyclothyris – tentative report
 * † Cyclothyris subtrigonalis
 * † Cylichna
 * † Cylichna secalina
 * † Cylindroteuthis
 * † Cylindroteuthis cuspidata
 * † Cylindroteuthis jacuticaex gr.
 * † Cymatoceras – tentative report
 * † Cymatoceras
 * † Cymatoceras hilli
 * † Cymatoceras sp.
 * † Cymprimera
 * † Cymprimera sp.
 * † Cynepteris
 * † Cynepteris sp.
 * † Cynepteris spp.
 * † Cynosphenodon – type locality for genus
 * † Cynosphenodon huizachalensis – type locality for species
 * † Cypricardia
 * † Cypricardia texanumaff.
 * † Cyprimeria – tentative report
 * † Cyprimeria
 * † Cyprimeria alta
 * † Cyprimeria coonensis
 * † Cyprimeria sp.
 * † Cyprimeria texana
 * † Cyrtocapsa
 * † Cyrtocapsa tripes
 * † Cytherella
 * † Cytherella sp.
 * † Cytheropteron
 * † Cytheropteron trinitiensis – tentative report
 * † Dakosaurus – or unidentified comparable form
 * † Dakosaurus
 * † Dakosaurus sp.
 * † Dakoticancer
 * † Dakoticancer australis
 * † Danubea
 * † Danubea sp. Ainformal
 * † Darbyella – tentative report
 * † Darbyella sp.
 * † Dardanus
 * † Dardanus mexicanus
 * † Decodon
 * † Decodon tiffneyi – type locality for species
 * † Deinosuchus – or unidentified comparable form
 * † Deinosuchus
 * † Deinosuchus riograndensis
 * † Deinosuchus sp.
 * † Dendraraea
 * † Dendraraea mammelonata
 * † Dentalina
 * † Dentalina sp.
 * † Dentalium
 * † Dentalium sp.
 * † Dermoseris
 * † Dermoseris sp.
 * † Dermosmilia
 * † Dermosmilia cretacica – or unidentified comparable form
 * † Dermosmilia cretacica
 * † Dermosmilia sp.
 * † Dermosmilia tuapensis – type locality for species
 * † Dermosmiliopsis
 * † Dermosmiliopsis orbignyi
 * † Desmiophyllum
 * † Desmiophyllum poleoensis
 * † Desmiophyllum sp.
 * † Desmoceras
 * † Desmoceras austeniaff.
 * † Desmoceras latidorsatum
 * † Desmoceras sp.
 * † Desmoceras symmonense
 * † Desmophyllites
 * † Desmophyllites diphylloides
 * † Deviatus – tentative report
 * † Deviatus
 * † Deviatus diamphidius
 * † Deviatus hipposidericus – or unidentified comparable form
 * † Dicarinella
 * † Dicarinella sp.
 * † Diceratigalea
 * † Diceratigalea gastili
 * † Diceratigalea halseyensis
 * † Dicerosaturnalis
 * † Dicerosaturnalis dicranacanthos – or unidentified comparable form
 * † Dicerosaturnalis dicranacanthos
 * † Dichocoenia
 * † Dichocoenia anomalos
 * † Dichocoenia sp.
 * † Dichotomites
 * † Dichotomites multicostatus
 * † Dicksonia
 * † Dicksonia sp.
 * † Dicothodon
 * † Dicothodon bajaensis – type locality for species
 * † Dictuophyllia
 * † Dictuophyllia conferticostata
 * † Dictyoconites
 * † Dictyoconites reticulatum – or unidentified comparable form
 * † Didymoceras
 * † Didymoceras donezianum
 * † Didymotis
 * † Didymotis costatus
 * † Dimorpharaea
 * † Dimorpharaea koechlini
 * † Dimorphastraeopsis
 * † Dimorphastraeopsis bohemica
 * † Dimorphastrea
 * † Dimorphastrea petalophyes
 * † Dimorphocoenia
 * † Dimorphocoenia xipei
 * † Dimorphodon
 * † Dimorphodon weintraubi – type locality for species
 * † Diozoptyxis
 * † Diozoptyxis pilgrimi – or unidentified comparable form
 * † Diploastrea
 * † Diploastrea harrisi
 * † Diplocoenia
 * † Diplocoenia sp.
 * † Diplomoceras
 * † Diplomoceras cylindraceum
 * † Diplopora – or unidentified comparable form
 * † Diplopora sp.
 * † Diplotremina – or unidentified comparable form
 * † Diplotremina sp.
 * † Discamphiceras – tentative report
 * † Discamphiceras sp.
 * † Discorbis – tentative report
 * † Discorbis sp.
 * † Dissocladella
 * † Dissocladella savitriae – or unidentified comparable form
 * † Distichomeandra
 * † Distichomeandra austriaca
 * † Distolocerasaff.
 * † Distoloceras
 * † Distoloceras capulinense – or unidentified comparable form
 * † Distoloceras parritense
 * † Distoloceras sp.
 * † Douvilleiceras
 * † Douvilleiceras – type locality for speciesinformal
 * † Douvilleiceras bigoureti
 * † Douvilleiceras cornueliaff.
 * † Douvilleiceras delgoense – or unidentified comparable form
 * † Douvilleiceras martiniaff.
 * † Douvilleiceras martini
 * † Douvilleiceras pretiosum – or unidentified comparable form
 * † Douvilleiceras rex – or unidentified comparable form
 * † Douvilleiceras sp.
 * † Douvilleiceras volgense
 * † Douvilleiceras wilfridi
 * † Douvillelia
 * † Douvillelia skeltoni – type locality for species
 * † Douvillelia skeltoni
 * † Douvillelia sp.
 * † Drilluta
 * † Drilluta gloriae
 * † Droltus
 * † Droltus eurasiaticusaff.
 * † Droltus sanignacioensis – type locality for species
 * † Droltus sanignacioensis
 * † Droltus sp. Ainformal
 * † Duashnoceras
 * † Duashnoceras andinense
 * † Duashnoceras floresi – or unidentified comparable form
 * † Duashnoceras floresi
 * † Duashnoceras paucicostatum
 * † Duashnoceras sp.
 * † Duashnoceras undulatum
 * † Ducatus
 * † Ducatus hipolitoensis – type locality for species
 * † Ducatus hipolitoensis
 * † Dufrenoyia
 * † Dufrenoyia boesei
 * † Dufrenoyia dufrenoyi
 * † Dufrenoyia durangoensis
 * † Dufrenoyia furcataaff.
 * † Dufrenoyia huastecensis – type locality for species
 * † Dufrenoyia justinae
 * † Dufrenoyia mulatoensisaff.
 * † Dufrenoyia scotti
 * † Dufrenoyia sp.informal
 * † Dufrenoyia sp.
 * † Dufrenoyia texana
 * † Durangites
 * † Durangites sp. Ainformal
 * † Durangites sp. Binformal
 * † Durangites zigzagcostatusaff.
 * † Durangites zigzagcostatus
 * † Durania
 * † Durania arnaudi
 * † Durania curasavica
 * † Durania huasteca – type locality for species
 * † Durania nicholasi
 * † Durania ojanchalensis
 * † Echinobathra
 * † Echinobathra durhami
 * † Ectocentrites
 * † Ectocentrites hillebrandti – type locality for species
 * † Elasmocoenia
 * † Elasmocoenia guerangeri – or unidentified comparable form
 * † Elatocladus
 * † Elatocladus carolinensisex gr.
 * † Elatocladus carolinensis
 * † Elatocladus sp.
 * † Elatocladus spp.
 * † Ellimmichthys
 * † Ellimmichthys sp.
 * † Elliptio
 * † Elliptio sp.informal
 * † Enallaster
 * † Enallaster texanus – tentative report
 * † Enallaster texanus
 * † Enallhelia
 * † Enallhelia anomalos
 * † Enallhelia somaensis
 * † Enchodus
 * † Enchodus sp.
 * † Enchodus zipapanensis – type locality for species
 * † Endostoma
 * † Endostoma mexicana – type locality for species
 * † Engonoceras
 * † Engonoceras sp.
 * † Enoploclytia
 * † Enoploclytia sp.
 * † Enoploclytia tumimanus
 * † Entolium
 * † Entolium corneolum
 * † Entolium disciforme
 * † Eocallista – tentative report
 * † Eocallista
 * † Eocallista brongniarti
 * † Eocallista pulchella
 * † Eocallista sp.
 * † Eocalyptraphorus
 * † Eocalyptraphorus binodiferus
 * † Eocomoseris
 * † Eocomoseris ramosa
 * † Eodouvilleiceras
 * † Eodouvilleiceras adkinsi
 * † Eoheteroceras
 * † Eoheteroceras sp.
 * † Eohydnophora
 * † Eohydnophora ovalis
 * † Eohydnophora picteti
 * † Eopaquiericeras
 * † Eopaquiericeras pazi
 * † Eopaquiericeras peraltai
 * † Eopecten
 * † Eopecten velatus
 * † Eoradiolites
 * † Eoradiolites davidsoniaff.
 * † Eoradiolites davidsoni
 * † Eoradiolites sp.
 * † Eoscaphites
 * † Eoscaphites tenuicostatus – or unidentified comparable form
 * † Eospongosaturninus
 * † Eospongosaturninus protoformis
 * † Ephedra
 * † Ephedra sp.
 * † Epiaster
 * † Epiaster sp.
 * † Epigondelella – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Epigondelella sp. – type locality for species
 * † Epistomina – tentative report
 * † Epistomina cretosa
 * † Epistreptophyllum
 * † Epistreptophyllum sp.
 * † Epitonium
 * † Epitonium faearium – or unidentified comparable form
 * † Eptingium
 * † Eptingium sp. Ainformal
 * † Eptingium sp. Binformal
 * † Equisetites
 * † Equisetites sp.
 * † Equisetum
 * † Equisetum rajmahalense
 * † Equisetum rajmahalensis
 * † Eriphylopsis
 * † Eriphylopsis sp.
 * † Etea
 * † Etea sp.
 * † Ethmocardium
 * † Ethmocardium sp.
 * † Ethmocardium welleri
 * † Euclastes
 * † Euclastes coahuilaensis – type locality for species
 * † Euclastes coahuilaensis
 * † Eucycloscala
 * † Eucycloscala emersoni
 * † Eucycloscala subbisertus
 * † Eucymatoceras
 * † Eucymatoceras sp.
 * † Eugyra
 * † Eugyra affinis
 * † Eugyra lanckoronensis
 * † Eugyra neocomiensis
 * † Eugyra pontica
 * † Eunerinea
 * † Eunerinea aptiensis – or unidentified comparable form
 * † Eunerinea hicoriensis
 * † Eunerinea titania
 * † Euspira
 * † Euspira rectilabrum
 * † Euthriofusus
 * † Euthriofusus wenzi
 * † Eutrephoceras
 * † Eutrephoceras irritilasi – type locality for species
 * † Eutrephoceras irritilasi
 * † Eutrephoceras sp.
 * † Everticyclammina
 * † Everticyclammina virguliana
 * † Exiteloceras
 * † Exiteloceras jenneyi
 * † Exnelumbites – type locality for genus
 * † Exnelumbites callejasiae – type locality for species
 * † Exogyraaff.
 * † Exogyra
 * † Exogyra acroumbonata
 * † Exogyra acuticosta
 * † Exogyra cartledgei
 * † Exogyra columbella
 * † Exogyra costata
 * † Exogyra haarmanni
 * † Exogyra latissima
 * † Exogyra latissimum
 * † Exogyra olisiponensis – or unidentified comparable form
 * † Exogyra ponderosa
 * † Exogyra putnami
 * † Exogyra quitmanensis – or unidentified comparable form
 * † Exogyra reedi
 * † Exogyra robusta
 * † Exogyra sp.
 * † Exogyra sp. Binformal
 * † Exogyra sp. Cinformal
 * † Exogyra tamaulipana
 * † Exogyra tlahualiloensis
 * † Exogyra tuberculifera
 * † Exogyra yabei
 * † Fagesia
 * † Fagesia catinusaff.
 * † Fagesia catinus
 * † Fagesia pervinquieri – tentative report
 * † Fagesia sp.
 * † Falcimytilus
 * † Falcimytilus sp.
 * † Fanthalamia
 * † Fanthalamia glomerata – type locality for species
 * † Fanthalamia polystoma
 * † Fanthalamia sp.
 * † Faraudiella
 * † Faraudiella franciscoensis
 * † Farcus – tentative report
 * † Farcus
 * † Farcus asperoensis
 * † Farcus sp.
 * † Favia – tentative report
 * † Favia gregoryi
 * † Favrella
 * † Favrella sp.
 * † Favusella
 * † Favusella washitensis
 * † Felixigyra
 * † Felixigyra patruliusi
 * † Felixigyra sp.
 * † Ficheuria
 * † Ficheuria pernoniaff.
 * † Filkornia
 * † Filkornia parasolitaria
 * † Fimbria
 * † Fimbria peninsularis
 * † Fimbria sp.
 * † Flemingostrea
 * † Flemingostrea subspatula
 * † Flemingostrea subspatulata
 * † Forresteria
 * † Forresteria alluaudi
 * † Forresteria brancoi
 * † Freixialina
 * † Freixialina planispiralis
 * † Frenguelliella
 * † Frenguelliella inexspectata – or unidentified comparable form
 * † Frenguelliella poultoni
 * † Frenolepsis – or unidentified comparable form
 * † Frenolepsis sp.
 * † Fungiastraea
 * † Fungiastraea crespoi
 * † Gallolestes – type locality for genus
 * † Gallolestes pachymandibularis – type locality for species
 * † Gansserina
 * † Gansserina gansseri
 * † Gargasiceras
 * † Gargasiceras acutecostum
 * † Gastrochaena
 * † Gastrochaena sp.
 * † Gaudryceras
 * † Gaudryceras kayei
 * † Gaudryceras mite
 * † Gerhardtia
 * † Gerhardtia sp.
 * † Gervillaria
 * † Gervillaria alaeformis
 * † Gervillaria sp.
 * † Gervillella
 * † Gervillella araucana
 * † Gervillella leesi
 * † Gervillia
 * † Gervillia alatior
 * † Gervillia sp. Ainformal
 * † Ginglymostoma
 * † Ginglymostoma sp.
 * † Glabrocingulum
 * † Glabrocingulum sp.
 * † Gleviceras
 * † Gleviceras palomenseaff.
 * † Globotruncana
 * † Globotruncana falsostuarti
 * † Globotruncana linneiana
 * † Globotruncana rioensis
 * † Globotruncana rosseta
 * † Globotruncana sp.
 * † Globotruncana ventricosa
 * † Globulina
 * † Globulina exserta
 * † Glochiceras
 * † Glochiceras sp.
 * † Glossopteris
 * † Glossopteris sp.
 * † Glycymeris
 * † Glycymeris sp.
 * † Glycymeris veatchii
 * † Glyphiteuthis
 * † Glyphiteuthis rhinophora – type locality for species
 * † Gonatosorus
 * † Gonatosorus nathorstii
 * † Goniocora
 * † Goniocora sp.
 * † Goniomya
 * † Goniomya sp.
 * † Goniomya sp. Ainformal
 * † Goniopora
 * † Goniopora sp.
 * † Goodhallites
 * † Goodhallites aguilerae
 * † Gorgansium
 * † Gorgansium gongyloideum
 * † Gorgansium sp.
 * † Gorgansium sp. Ainformal
 * † Grallator
 * † Grallator sp.
 * † Grammatodon
 * † Grammatodon rayaensis – type locality for species
 * † Grammatodon sp.
 * † Grammatodon sulcatus
 * † Grammatodon vancouverensis
 * † Granocardium
 * † Granocardium tippanum
 * † Granosolarium
 * † Granosolarium coffea
 * † Graptocarcinus
 * † Graptocarcinus muiri
 * † Graysonites – tentative report
 * † Graysonites
 * † Graysonites adkinsi
 * † Graysonites reynoldsi – type locality for species
 * † Graysonites sp.
 * † Graysonites wacoense
 * † Gresslya – tentative report
 * † Gresslya
 * † Gresslya sp.
 * † Gresslya striata – or unidentified comparable form
 * † Griphoporella
 * † Griphoporella sp.
 * † Groeberella
 * † Groeberella sp. Ainformal
 * † Gryphaea
 * † Gryphaea mucronata
 * † Gryphaea sp.
 * † Gryphaea wardi
 * † Gryphaea washitaensis
 * † Guidonia
 * † Guidonia intermedia – or unidentified comparable form
 * † Guidonia parvula – or unidentified comparable form
 * † Guttulina
 * † Guttulina exepolita
 * † Guzzyella
 * † Guzzyella acuminata
 * † Guzzyella bisulcata
 * † Guzzyella sp. 1informal
 * † Guzzyella sp. 2informal
 * † Gymnentome
 * † Gymnentome sp.
 * † Gymnentome zebra
 * † Gyrodes
 * † Gyrodes major
 * † Gyrodes supraplicatus
 * † Gyrostrea
 * † Gyrostrea sp.
 * † Haeckelicyrtium
 * † Haeckelicyrtium sp. Binformal
 * † Hagiastrum
 * † Hagiastrum augustum
 * † Hagiastrum majusculum
 * † Hagiastrum rudimentum
 * † Haldonia – tentative report
 * † Haldonia
 * † Haldonia cyclops
 * † Halimeda
 * † Halimeda sp.
 * † Halobia
 * † Halobia lineata
 * † Hamites
 * † Hamites attenuatusaff.
 * † Hamites attenuatus
 * † Hamites carrancoi
 * † Hamites charpentieriaff.
 * † Hamites intermediusaff.
 * † Hamites simplex
 * † Hamites sp.
 * † Hamites tropicalis – or unidentified comparable form
 * † Hamites venetzianus – or unidentified comparable form
 * † Hamites virgulatus – or unidentified comparable form
 * † Hamulina
 * † Hamulina sp.
 * † Hamulinites
 * † Hamulinites sp.
 * † Haploceras
 * † Haploceras sp.
 * † Haploceras transatlanticum
 * † Haplocytheridea – tentative report
 * † Haplocytheridea sp.
 * † Harpactocarcinus
 * † Harpactocarcinus americanus
 * † Harpagodes
 * † Harpagodes americanus
 * † Harpagodes desori – or unidentified comparable form
 * † Harpagodes mexicanus
 * † Harpagodes oceani
 * † Hedbergella
 * † Hedbergella delrioensis
 * † Hedbergella monmouthensis
 * † Heliocoenia
 * † Heliocoenia rarauensis
 * † Heliocoenia rozkowskae
 * † Heliocoenia variabilis
 * † Hemiaster – tentative report
 * † Hemiaster
 * † Hemiaster bexari
 * † Hemiaster calvani – tentative report
 * † Hemiaster calvani
 * † Hemiaster calvini
 * † Hemiaster sp.
 * † Hemiaster whitei
 * † Hemihoplites – tentative report
 * † Hemihoplites mexicanus
 * † Heminautilus
 * † Heminautilus lallierianusaff.
 * † Heteraster
 * † Heteraster mexicanus
 * † Heteraster sp.
 * † Heterastridium
 * † Heterastridium conglobatum
 * † Heterastridium sp.
 * † Heterocoenia – tentative report
 * † Heterocoenia
 * † Heterocoenia exigua
 * † Heterocoenia pusilla
 * † Heterodontosaurus – or unidentified comparable form
 * † Heterodontosaurus sp.
 * † Heterohelix
 * † Heterohelix globulosa
 * † Heterohelix sp.
 * † Hexasaturnalis
 * † Hexasaturnalis hexagonus – or unidentified comparable form
 * † Higumastra
 * † Higumastra inflata – or unidentified comparable form
 * † Hippurites
 * † Hippurites ceibarum
 * † Hippurites muellerriedi
 * † Hippurites perkinsi – tentative report
 * † Hippurites resectus
 * † Hoeglundina
 * † Hoeglundina carpenteri
 * † Holaster – tentative report
 * † Holaster
 * † Holaster nanus
 * † Holaster sp.
 * † Holcostephanus
 * † Holcostephanus sp.
 * † Holectypus
 * † Holectypus planatus
 * † Holectypus sp.
 * † Holectypus sp. Ainformal
 * † Holectypus sp. Binformal
 * † Holectypus sp. Dinformal
 * † Holocystis
 * † Holocystis elegans
 * † Holospira
 * † Holospira sp.
 * † Homoeoparonaella
 * † Homoeoparonaella elegans
 * † Homoeoparonaella lowryensis – type locality for species
 * † Homoeoparonaella lowryensis
 * † Homomya
 * † Homomya casei
 * † Homomya sp.
 * † Hoplites
 * † Hoplites sp.
 * † Hoplitoides
 * † Hoplitoides gibbosulus – or unidentified comparable form
 * † Hoplitoides ingens
 * † Hoplitoides mirabilisaff.
 * † Hoplitoides sp.
 * † Hoplochelys – or unidentified comparable form
 * † Hoplochelys sp.
 * † Hsuum
 * † Hsuum arenaense – type locality for species
 * † Hsuum arenaense
 * † Hsuum mclaughlini
 * † Hsuum sp.
 * † Hsuum tamanense
 * † Huasteconodon – type locality for genus
 * † Huasteconodon wiblei – type locality for species
 * † Huehuecanauhtlus – type locality for genus
 * † Huehuecanauhtlus
 * † Huehuecanauhtlus tiquichensis – type locality for species
 * † Huehuecanauhtlus tiquichensis
 * † Huehuecuetzpalli – type locality for genus
 * † Huehuecuetzpalli mixtecus – type locality for species
 * † Huetamia
 * † Huetamia buitronae – type locality for species
 * † Huetamia buitronae
 * † Huetamia sp.
 * † Hybodus
 * † Hybodus sp.
 * † Hypacanthoplites
 * † Hypacanthoplites burckhardti
 * † Hypacanthoplites ceratitosus
 * † Hypacanthoplites clavatusaff.
 * † Hypacanthoplites leanzae – or unidentified comparable form
 * † Hypacanthoplites plesiotypicus
 * † Hypacanthoplites rugosusaff.
 * † Hypacanthoplites sarasiniaff.
 * † Hypacanthoplites sp.
 * † Ichthyornis
 * † Ichthyornis dispar
 * † Ichthyosaurus
 * † Ichthyosaurus sp.
 * † Icriocarcinus
 * † Icriocarcinus xestos
 * † Idoceras
 * † Idoceras inflatum
 * † Idoceras pinonense – type locality for species
 * † Idoceras pinonense
 * † Idoceras sp.
 * † Immunitoceras
 * † Immunitoceras immunitumaff.
 * † Immunitoceras immunitum
 * † Immunitoceras pruvosti – type locality for species
 * † Immunitoceras sp.
 * † Indotrigonia
 * † Indotrigonia sp.
 * † Inoceramus
 * † Inoceramus anglicus – or unidentified comparable form
 * † Inoceramus ezoensis – or unidentified comparable form
 * † Inoceramus goldfussianus
 * † Inoceramus pacificus
 * † Inoceramus pictus
 * † Inoceramus shikotanensis – or unidentified comparable form
 * † Inoceramus sp.
 * † Inoceramus vanuxemi
 * † Inoperna
 * † Inoperna perplicata – or unidentified comparable form
 * † Integricardium – tentative report
 * † Integricardium sp.
 * † Isastrea
 * † Isastrea neocomiensis – or unidentified comparable form
 * † Isastrea whitneyi
 * † Ischyrhiza
 * † Ischyrhiza sp.
 * † Isocyprina
 * † Isocyprina ancatruzi
 * † Isognomon
 * † Isognomon lamberti
 * † Ixtahua – type locality for genus
 * † Ixtahua benjamini – type locality for species
 * † Jalpania
 * † Jalpania queretana
 * † Jponsia
 * † Jponsia geslini
 * † Kamerunoceras
 * † Kamerunoceras isovokyense
 * † Karakaschiceras
 * † Karakaschiceras biassalense – or unidentified comparable form
 * † Karakaschiceras sp.
 * † Karsteniceras
 * † Karsteniceras sp.
 * † Katroma
 * † Katroma angusta
 * † Katroma aurita – type locality for species
 * † Katroma aurita
 * † Katroma clara
 * † Katroma sp. Ainformal
 * † Kazanskyella
 * † Kazanskyella arizonica – or unidentified comparable form
 * † Keilostoma
 * † Keilostoma quaidei
 * † Keriophyllia
 * † Keriophyllia roniewiczae – type locality for species
 * † Kilianella
 * † Kilianella lucensis – or unidentified comparable form
 * † Kimbleia
 * † Kimbleia albrittoni
 * † Kimbleia sp.
 * † Kingena
 * † Kingena wacoensis
 * † Kobyastraea – tentative report
 * † Kobyastraea holmoides
 * † Kossmatella
 * † Kossmatella agassizi
 * † Kossmatia
 * † Kossmatia bifurcata – or unidentified comparable form
 * † Kossmatia purisima
 * † Kouphichnium
 * † Kouphichnium sp.
 * † Kritosaurus – or unidentified comparable form
 * † Kritosaurus sp.
 * † Ksiazkiewiczia
 * † Ksiazkiewiczia poblana – type locality for species
 * † Kurnubia
 * † Kurnubia palastiniensisex gr.
 * † Labocania – type locality for genus
 * † Labocania anomala – type locality for species
 * † Labyrinthina
 * † Labyrinthina mirabilis
 * † Laccopteris
 * † Laccopteris sp.
 * † Laluzia – type locality for genus
 * † Laluzia armini – type locality for species
 * † Lamellofungia
 * † Lamellofungia tenochi
 * † Lantus
 * † Lantus sp. Ainformal
 * † Lanubus
 * † Lanubus sp.
 * † Latiastrea
 * † Latiastrea kaufmanni
 * † Latiastrea mucronata
 * † Latiastrea variabilis
 * † Latiphyllia
 * † Latiphyllia mexicana – type locality for species
 * † Latiphyllia mexicana
 * † Latirhinus – type locality for genus
 * † Latirhinus uitstlani – type locality for species
 * † Latusastrea
 * † Latusastrea alveolaris
 * † Latusastrea irregularis
 * † Latusastrea provincialis
 * † Laurozamites
 * † Laurozamites fragilisex gr.
 * † Laurozamites fragilis – type locality for species
 * † Laurozamites pima – type locality for species
 * † Laurozamites tarahumara – type locality for species
 * † Laurozamites yaqui – type locality for species
 * † Lechites
 * † Lechites gaudini – or unidentified comparable form
 * † Legumen
 * † Legumen ooides
 * † Lenticulina
 * † Lenticulina sp.
 * † Lenticulina subalta – or unidentified comparable form
 * † Leopoldiaaff.
 * † Leopoldia – or unidentified comparable form
 * † Leopoldia
 * † Leopoldia bakeri
 * † Leopoldia crassicostata
 * † Leopoldia truncata
 * † Lepidorbitoides
 * † Lepidorbitoides minima
 * † Lepidotes
 * † Lepidotes sp.
 * † Lepisosteus
 * † Lepisosteus sp.
 * † Leptarbacia
 * † Leptarbacia argutus
 * † Leptomaria
 * † Leptomaria austinensis
 * † Leptosphinctes
 * † Leptosphinctes sp.
 * † Leptosphinctes tabernai
 * † Lima
 * † Lima coahuilensis
 * † Lima elpasensis – or unidentified comparable form
 * † Lima nodulosa
 * † Lima sp.
 * † Lima wacoensis
 * † Limopsis
 * † Limopsis sp.
 * † Linearis
 * † Linearis sp.
 * † Liocarenus
 * † Liocarenus formosum
 * † Liopeplum
 * † Liopeplum cretaceum – or unidentified comparable form
 * † Lispodesthes
 * † Lispodesthes lilipus – type locality for species
 * † Lithophaga
 * † Lithophaga sp.
 * † Loboseris
 * † Loboseris mexicana – type locality for species
 * † Loboseris mexicana
 * † Loffa
 * † Loffa mulleri – type locality for species
 * † Loffa mulleri
 * † Longusorbis
 * † Longusorbis quadratus
 * † Loopus – tentative report
 * † Loopus
 * † Loopus campbelli – or unidentified comparable form
 * † Loopus campbelli
 * † Loopus mexicana
 * † Loopus primitivus – or unidentified comparable form
 * † Loopus primitivus
 * † Loopus probus
 * † Loopus sp.
 * † Lopha – tentative report
 * † Lopha cordillerana – type locality for species
 * † Lophoranina
 * † Lophoranina cristaspina
 * † Loxo
 * † Loxo decore
 * † Loxoconcha – tentative report
 * † Loxoconcha sp.
 * † Lucina
 * † Lucina kellumi
 * † Lucina radiata – or unidentified comparable form
 * † Lucina sp.
 * † Lunatia – tentative report
 * † Lunatia
 * † Lunatia praegrandis
 * † Lunatia sp.
 * † Lyelliceras
 * † Lyelliceras lyelli – or unidentified comparable form
 * † Lyriochlamys
 * † Lyriochlamys traskii
 * † Lytoceras
 * † Lytoceras sp.
 * † Macgeopsis
 * † Macgeopsis sonorensis – type locality for species
 * † Macgillavryia
 * † Macgillavryia nicholasi
 * † Macraster
 * † Macraster sp.
 * † Macropterygium
 * † Macropterygium sp.
 * † Macroscaphites
 * † Macroscaphites sp.
 * † Macrosemicotzus
 * † Macrosemicotzus americanus
 * † Macrosemiocotzus – type locality for genus
 * † Macrosemiocotzus americanus – type locality for species
 * † Macrotaeniopteris
 * † Macrotaeniopteris sp.
 * † Maderia
 * † Maderia casitensis
 * † Maderia coahuilensis
 * † Maderia marcoensis
 * † Maeandrostylis
 * † Maeandrostylis antimoniensis – type locality for species
 * † Maeandrostylis antimoniensis
 * † Magnapaulia
 * † Magnapaulia laticaudus
 * † Mammillopora
 * † Mammillopora encrusta
 * † Mammites
 * † Mammites mohavanensis
 * † Mammites mohovanensis
 * † Mammites nodosoides
 * † Mantelliceras
 * † Mantelliceras charlestoni – type locality for species
 * † Mantelliceras mantelli
 * † Mantelliceras martimpreyi – or unidentified comparable form
 * † Mantelliceras portalesi – type locality for species
 * † Mantelliceras saxbii
 * † Marginotruncana
 * † Marginotruncana sp.
 * † Mariella
 * † Mariella bosquensis
 * † Mariella brazoensis
 * † Mariella camachoensis
 * † Marinella
 * † Marinella lugeoni
 * † Mathoceras
 * † Mathoceras celestinae – type locality for species
 * † Mathoceras neoleonensis – type locality for species
 * † Mathoceras sp.
 * † Mathoceras venezolanum – or unidentified comparable form
 * † Mauriciosaurus – type locality for genus
 * † Mauriciosaurus fernandezi – type locality for species
 * † Mazatepites
 * † Mazatepites arredondense
 * † Meandraraea
 * † Meandraraea tulae
 * † Meandrastrea
 * † Meandrastrea wollheimi
 * † Meandrophyllia
 * † Meandrophyllia lotharinga – or unidentified comparable form
 * † Meandrophyllia lotharinga
 * † Meandrophyllia meandriformis
 * † Meandrophyllia meandroides
 * † Meandrophyllia montezumae
 * † Meandrophyllia oceani
 * † Meandrophyllia steini
 * † Meandrospira
 * † Meandrospira sp.
 * † Mecochirus
 * † Mecochirus sp.
 * † Meekia
 * † Meekia sp.
 * † Megalops
 * † Megalops sp.
 * † Megatyloceras
 * † Megatyloceras sp.
 * † Megaxantho
 * † Megaxantho zoque
 * † Melvius – or unidentified comparable form
 * † Melvius
 * † Melvius sp.
 * † Menabites
 * † Menabites vanuxemi
 * † Menuites
 * † Menuites sp.
 * † Mertensides
 * † Mertensides bullatus
 * † Mertensides sp.
 * † Mertensides spp.
 * † Mesalia
 * † Mesalia mauryae
 * † Mesodma
 * † Mesodma formosa – or unidentified comparable form
 * † Mesoendothyra
 * † Mesoendothyra croatica
 * † Mesoglauconia
 * † Mesoglauconia burnsi
 * † Mesoglauconia sp.
 * † Mesolanistes
 * † Mesolanistes reesidei
 * † Mesomiltha
 * † Mesomiltha portlandica
 * † Mesomorpha
 * † Mesomorpha ornata
 * † Mesorbitolina
 * † Mesorbitolina sp.
 * † Mesorbitolina texana
 * † Metacerithium
 * † Metacerithium sp.
 * † Metengonoceras
 * † Metengonoceras bravoense
 * † Metoicoceras
 * † Metoicoceras bosei
 * † Metoicoceras geslinianum – or unidentified comparable form
 * † Metoicoceras sp.
 * † Metriorhynchus – or unidentified comparable form
 * † Metriorhynchus sp.
 * † Mexicanoceras
 * † Mexicanoceras laticostatum
 * † Mexicanoceras multicostatum
 * † Mexicaprina
 * † Mexicaprina alata
 * † Mexicaprina cornuta
 * † Mexicaprina minuta
 * † Mexicaprina quadrata
 * † Mexiglossa
 * † Mexiglossa sp.
 * † Mexiglossa varia
 * † Mexopus – type locality for genus
 * † Mexopus
 * † Mexopus mexicanus – type locality for species
 * † Mexopus robustus – type locality for species
 * † Meyeria
 * † Meyeria mexicana
 * † Meyeria pueblaensis – type locality for species
 * † Meyeria pueblaensis
 * † Michin – type locality for genus
 * † Michin csernai – type locality for species
 * † Microphyllia
 * † Microphyllia densecostata
 * † Microschiza
 * † Microschiza scalaris
 * † Microsolena – tentative report
 * † Microsolena
 * † Microsolena guttata
 * † Microsolena kobyi
 * † Microsolena sp.
 * † Mirifusus
 * † Mirifusus sp.
 * † Mitrocaprina
 * † Mitrocaprina sp.
 * † Mitrocaprina tschoppi
 * † Mixastraea
 * † Mixastraea westfalica
 * † Modiolus
 * † Modiolus baylei – or unidentified comparable form
 * † Modiolus giganteus
 * † Modiolus hallanus
 * † Momipites
 * † Momipites microcoryphaeus
 * † Momipites tenuipolusaff.
 * † Momipites triletipollenites
 * † Momipites triradiatus
 * † Monoclonius
 * † Monoclonius sp.
 * † Monopleura
 * † Monopleura ayalai
 * † Monopleura bicornuta
 * † Monopleura marcida
 * † Monopleura pinguiscula
 * † Monopleura sp.
 * † Monotis
 * † Monotis subcircularis – or unidentified comparable form
 * † Montastrea – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Montastrea sp.
 * † Montlivaltia
 * † Montlivaltia coahuilensis – type locality for species
 * † Montlivaltia rugulosa – or unidentified comparable form
 * † Montlivaltia sp.
 * † Morea
 * † Morea reticulata
 * † Morphastrea
 * † Morphastrea barcenai
 * † Morrowites
 * † Morrowites depressus – type locality for species
 * † Morrowites sp.
 * † Mortoniceras
 * † Mortoniceras inflatum – or unidentified comparable form
 * † Muellerriedia
 * † Muellerriedia boesei
 * † Muellerriedia sp.
 * † Multicolumnastraea
 * † Multicolumnastraea cyathiformis
 * † Multicolumnastraea sp.
 * † Multiptyxis
 * † Multiptyxis prefleuriaui
 * † Murphitys
 * † Murphitys madonna
 * † Muzquizopteryx – type locality for genus
 * † Muzquizopteryx – or unidentified comparable form
 * † Muzquizopteryx coahuilensis – type locality for species
 * † Muzquizopteryx sp.
 * † Muzquizoxylon – type locality for genus
 * † Muzquizoxylon porrasii – type locality for species
 * † Mycetaraea
 * † Mycetaraea dimorphaaff.
 * † Myledaphus
 * † Myledaphus bipartitus
 * † Myoconcha
 * † Myoconcha neuquena
 * † Myoconcha valenciennesi – or unidentified comparable form
 * † Myophorella
 * † Myophorella sp.
 * † Myophorigonia
 * † Myophorigonia jaworskii
 * † Myophorigonia salasi
 * † Myophoriopis
 * † Myophoriopis sonorensis
 * † Myriophyllia
 * † Myriophyllia cuyleri – or unidentified comparable form
 * † Myriophyllia propria
 * † Mysidioptera
 * † Mysidioptera mexicana
 * † Mytiloides
 * † Mytiloides herbichi
 * † Mytiloides hercynicus
 * † Mytiloides incertus
 * † Mytiloides labiatus
 * † Mytiloides scupini
 * † Mytiloperna – tentative report
 * † Mytiloperna sp. Ainformal
 * † Nanogyra
 * † Nanogyra virgula
 * † Naomichelys
 * † Naomichelys sp.
 * † Napora
 * † Napora boneti
 * † Napora bukryiaff.
 * † Napora bukryi
 * † Napora cerromesaensis
 * † Napora cornis
 * † Napora crudaaff.
 * † Napora cruda
 * † Napora heimi
 * † Napora imperfossa
 * † Napora insolita – or unidentified comparable form
 * † Napora reiferensis
 * † Napora vegaensis
 * † Naropa
 * † Naropa vi – type locality for species
 * † Naropa vi
 * † Natica – tentative report
 * † Natica – or unidentified comparable form
 * † Natica
 * † Natica conradi
 * † Natica hemispherica – or unidentified comparable form
 * † Natica hugardiana
 * † Natica importuna
 * † Natica neptuni
 * † Natica sp.
 * † Natica sueurii – or unidentified comparable form
 * † Natraglia
 * † Natraglia luminosa – type locality for species
 * † Natraglia unica – type locality for species
 * † Nautiloculina
 * † Nautiloculina bronnimanni
 * † Nautiloculina oolithica
 * † Neithea – or unidentified comparable form
 * † Neithea
 * † Neithea atava
 * † Neithea biangulata
 * † Neithea occidentalisaff.
 * † Neithea sp.
 * † Neithea wrightiaff.
 * † Neithea youngi – or unidentified comparable form
 * † Nemodon
 * † Nemodon eufalensis
 * † Nemodon sp.
 * † Neocomites
 * † Neocomites neocomiensis – or unidentified comparable form
 * † Neocomites neocomiensis
 * † Neocomites sp.
 * † Neocrassina – tentative report
 * † Neocrassina
 * † Neocrassina gueuxi
 * † Neocrassina sp.
 * † Neocrioceras – tentative report
 * † Neocrioceras sp.
 * † Neohoploceras
 * † Neohoploceras bartolinii – or unidentified comparable form
 * † Neoparonaella
 * † Neoparonaella delicata – or unidentified comparable form
 * † Neoparonaella delicata
 * † Neoparonaella sp.
 * † Neophlycticeras
 * † Neophlycticeras francisocensis – type locality for species
 * † Neophlycticeras texanum
 * † Neophylloceras
 * † Neophylloceras arturoi – type locality for species
 * † Neoptychites
 * † Neoptychites cephalotus
 * † Neoptychites sp.
 * † Neospathodus
 * † Neospathodus homeri
 * † Neospathodus triangularis
 * † Neovallupus
 * † Neovallupus dumitricai – or unidentified comparable form
 * † Neovallupus dumitricai
 * † Neovallupus modestusaff.
 * † Neovallupus modestus
 * † Neovallupus sp. Ainformal
 * † Neovallupus sp. Binformal
 * † Neovallupus sp. Cinformal
 * † Neridomus
 * † Neridomus delpeyae
 * † Nerinea
 * † Nerinea azteca – type locality for species
 * † Nerinea bosei
 * † Nerinea euphyes
 * † Nerinea gachupinae – type locality for species
 * † Nerinea galatea
 * † Nerinea pseudoconvexa – or unidentified comparable form
 * † Nerinea sp.
 * † Nerinea tomasensis
 * † Nerita
 * † Nerita divaricata – or unidentified comparable form
 * † Nerita sp.
 * † Neritoma
 * † Neritoma woodfordi
 * † Neurankylus
 * † Neurankylus sp.
 * † Nevadathalamia
 * † Nevadathalamia cylindrica
 * † Nezzazata
 * † Nezzazata isabellae – or unidentified comparable form
 * † Nicklesia
 * † Nicklesia sp.
 * † Nilsonia
 * † Nilsonia macrophylla
 * † Nilsonia morrisiana – tentative report
 * † Nododelphinula
 * † Nododelphinula diminuta
 * † Nododelphinula galeotti
 * † Nodosaria – or unidentified comparable form
 * † Nodosaria
 * † Nodosaria orthopleura
 * † Nodosaria sceptrum
 * † Nodosaria sp.
 * † Noeggerathiopsis – tentative report
 * † Noeggerathiopsis
 * † Noeggerathiopsis hislopii
 * † Noeggerathiopsis sp.
 * † Normapolles
 * † Normapolles sp.
 * † Nostoceras
 * † Nostoceras hyatti
 * † Notelops
 * † Notelops sp.
 * † Nucula
 * † Nucula ciboloensis
 * † Nuculana
 * † Nuculana corsicana
 * † Nuculana sp.
 * † Nudopollis
 * † Nudopollis sp.
 * † Nychtosaurus – or unidentified comparable form
 * † Nychtosaurus sp.
 * † Ochetoceras
 * † Ochetoceras neohispanicum – or unidentified comparable form
 * † Odontaspis
 * † Odontaspis sp.
 * † Offneria
 * † Offneria sp.
 * † Olcostephanus
 * † Olcostephanus astierianusaff.
 * † Olcostephanus astierianus – or unidentified comparable form
 * † Olcostephanus bakeri
 * † Olcostephanus balestrai
 * † Olcostephanus colorinensis
 * † Olcostephanus filifer
 * † Olcostephanus paucicostatus
 * † Olcostephanus prorsiradiatus
 * † Olcostephanus psilostomaaff.
 * † Olcostephanus sanlazarensis
 * † Olcostephanus sp.
 * † Oligoptycha – tentative report
 * † Oligoptycha popenoei
 * † Olmosoxylon – type locality for genus
 * † Olmosoxylon upchurchii – type locality for species
 * † Omalaxis
 * † Omalaxis planorbis – tentative report
 * † Omphaloptychia
 * † Omphaloptychia sp.
 * † Onychocella
 * † Onychocella schopforum
 * † Oosterella – tentative report
 * † Oosterella
 * † Oosterella begastrensis
 * † Oosterella cultrata
 * † Oosterella cultrataeformis
 * † Oosterella gaudryi
 * † Oosterella sp.
 * † Opalia
 * † Opalia riachuelanum
 * † Opalia sp.informal
 * † Opertochasma
 * † Opertochasma sp.
 * † Ophiactis
 * † Ophiactis applegatei
 * † Ophiomusiumaff.
 * † Ophiomusium sp.
 * † Ophthalmapseudes
 * † Ophthalmapseudes sp.
 * † Ophthalmoplax
 * † Ophthalmoplax difuntaensis
 * † Ophthalmosaurus
 * † Ophthalmosaurus icenicus – or unidentified comparable form
 * † Ophthalmosaurus icenicus
 * † Opis
 * † Opis rosarioensis
 * † Opis triangulata
 * † Oppelia
 * † Oppelia sp.
 * † Orbiculiforma
 * † Orbiculiforma cedrosensis
 * † Orbiculiforma sp.
 * † Orbiculiformella
 * † Orbiculiformella callosa
 * † Orbiculiformella sp. Ainformal
 * † Orbiculiformella sp. Binformal
 * † Orbiculiformella sp. Cinformal
 * † Orbignygyra – tentative report
 * † Orbignygyra mariscali
 * † Orbitolina
 * † Orbitolina sp.
 * † Orbitolina texana
 * † Orthaspidoceras
 * † Orthaspidoceras sp.
 * † Oscillopha
 * † Oscillopha arzipensis
 * † Oscillopha semiarmata
 * † Oscillopha sp.
 * † Osmunda
 * † Osmunda sp.
 * † Osteomya
 * † Osteomya dilata
 * † Ostrea
 * † Ostrea alicula
 * † Ostrea falcata
 * † Ostrea riograndensis
 * † Ostrea sloani – or unidentified comparable form
 * † Ostrea sp.
 * † Ostrea subovata
 * † Otostoma
 * † Otostoma japonica
 * † Otozamites
 * † Otozamites cardiopterioides
 * † Otozamites cardiopteroides
 * † Otozamites graphicus
 * † Otozamites hennoquei – or unidentified comparable form
 * † Otozamites hespera
 * † Otozamites pterophylloides – or unidentified comparable form
 * † Otozamites sp.
 * † Ovalastrea
 * † Ovalastrea sp.
 * † Oxybeloceras
 * † Oxybeloceras crassum
 * † Oxytoma
 * † Oxytoma inequivalvis – or unidentified comparable form
 * † Oxytropidoceras
 * † Oxytropidoceras acutocarinatumaff.
 * † Oxytropidoceras bravoensis
 * † Oxytropidoceras bravoenssi
 * † Oxytropidoceras chihuahuaense – or unidentified comparable form
 * † Oxytropidoceras decsernae
 * † Oxytropidoceras diazi – or unidentified comparable form
 * † Oxytropidoceras diazi
 * † Oxytropidoceras elaboratum
 * † Oxytropidoceras imlayi
 * † Oxytropidoceras multifidumaff.
 * † Oxytropidoceras roissyi – or unidentified comparable form
 * † Oxytropidoceras roissyi
 * † Pachydiscus
 * † Pachydiscus catarinae
 * † Pachydiscus colligatus – or unidentified comparable form
 * † Pachydiscus princeps – type locality for species
 * † Pachydiscus sp.
 * † Pachygyra
 * † Pachygyra ilerdensis – or unidentified comparable form
 * † Pachymya – tentative report
 * † Pachymya sp.
 * † Pachymya sp. Ainformal
 * † Pachyphyllia
 * † Pachyphyllia nannodes
 * † Pacificaprina
 * † Pacificaprina pyriformis
 * † Pagurus
 * † Pagurus sp.
 * † Palaeocardita
 * † Palaeocardita peruviana
 * † Palaeoctopus
 * † Palaeoctopus pelagicus – type locality for species
 * † Palaeolopha
 * † Palaeolopha haidingeriana – or unidentified comparable form
 * † Palaeoneilo
 * † Palaeoneilo elliptica
 * † Palaeosaturnalis
 * † Palaeosaturnalis liassicusaff.
 * † Palaeosaturnalis sp. Binformal
 * † Palaeosaturnalis tetraradiatus
 * † Palaeoxanthopsis
 * † Palaeoxanthopsis meyapaquensis
 * † Palaxius
 * † Palaxius shastaensis
 * † Paleoctenodiscus – type locality for genus
 * † Paleoctenodiscus campaniurnus – type locality for species
 * † Paleopagurus
 * † Paleopagurus pilsbryi
 * † Paleopentacta – type locality for genus
 * † Paleopentacta alencasterae – type locality for species
 * † Paleopsephaea – tentative report
 * † Paleopsephaea
 * † Paleopsephaea mutabilis
 * † Paleopsephaea sp.
 * † Palinandromeda
 * † Palinandromeda sp.
 * † Palinurus
 * † Palinurus palaciosi – type locality for species
 * † Palinurus sp.
 * † Palorbitolina
 * † Palorbitolina lenticularis
 * † Paltechioceras
 * † Paltechioceras burckhardtiex gr.
 * † Paltechioceras mexicanum
 * † Pamiropora
 * † Pamiropora sonorensis – type locality for species
 * † Pamiropora sonorensis
 * † Pamiroseris
 * † Pamiroseris rectilamellosa
 * † Pamizinsaurus – type locality for genus
 * † Pamizinsaurus tlayuanensis – type locality for species
 * † Pandanus – or unidentified comparable form
 * † Pandanus sp.
 * † Panopea – tentative report
 * † Panopea – or unidentified comparable form
 * † Panopea
 * † Panopea gurgitis
 * † Panopea neocomiensis
 * † Panopea remondii – type locality for species
 * † Panopea sp.
 * † Pantanellium
 * † Pantanellium cantuchapai
 * † Pantanellium carlense
 * † Pantanellium deflectum
 * † Pantanellium formosum – or unidentified comparable form
 * † Pantanellium formosum
 * † Pantanellium heimi
 * † Pantanellium huazalingoense
 * † Pantanellium inornatum
 * † Pantanellium meraceibaense
 * † Pantanellium parvulum
 * † Pantanellium quintachillaense
 * † Pantanellium ranchitoense
 * † Pantanellium silberlingi – type locality for species
 * † Pantanellium silberlingi
 * † Pantanellium skedansense
 * † Pantanellium sp.
 * † Pantanellium sp. Ainformal
 * † Pantanellium sp. Binformal
 * † Pantanellium sp. Einformal
 * † Pantanellium tierrablancaense
 * † Pantanellium tozeri – type locality for species
 * † Pantanellium tozeri
 * † Pantanellium westermanni
 * † Pantanellium whalenae
 * † Pantojaloria – type locality for genus
 * † Pantojaloria
 * † Pantojaloria sphaerica – type locality for species
 * † Pantojaloria sphaerica
 * † Paracalycoceras
 * † Paracalycoceras sp.
 * † Paracanthoplites
 * † Paracanthoplites sp.
 * † Parachaetetes – or unidentified comparable form
 * † Parachaetetes sp.
 * † Paraclupea – or unidentified comparable form
 * † Paraclupea sp.
 * † Paracoskinolina
 * † Paracoskinolina sunnilandensi
 * † Paracoskinolina sunnilandensis
 * † Paracrochordiceras – or unidentified comparable form
 * † Paracrochordiceras sp.
 * † Paracycloseris
 * † Paracycloseris effrenatus – type locality for species
 * † Paracycloseris nariensis
 * † Paracymatoceras
 * † Paracymatoceras milleri
 * † Paracypris
 * † Paracypris sp.
 * † Paraglauconia
 * † Paraglauconia sp.
 * † Parahoplites
 * † Parahoplites consobrinusaff.
 * † Parahoplites fasciculatus
 * † Parahoplites melchiorisaff.
 * † Parahoplites milletianusaff.
 * † Parahoplites milletianus
 * † Parahoplites sp.
 * † Parahsuum – tentative report
 * † Parahsuum
 * † Parahsuum mostleri
 * † Parahsuum simplumaff.
 * † Parahsuum simplum
 * † Parahsuum sp. Ainformal
 * † Parahsuum transiens – or unidentified comparable form
 * † Parahsuum vizcainoense – type locality for species
 * † Parallelodon
 * † Parallelodon hirsonensis – or unidentified comparable form
 * † Paranevadites
 * † Paranevadites furlongi – or unidentified comparable form
 * † Parapachydiscus
 * † Parapachydiscus catarinae – type locality for species
 * † Parapachydiscus peninsularis – type locality for species
 * † Parapsolus – type locality for genus
 * † Parapsolus tlayuensis – type locality for species
 * † Parasaynoceras
 * † Parasaynoceras mexicanum
 * † Parastrenoceras
 * † Parastrenoceras mixtecum
 * † Parastrenoceras sp.
 * † Parastrenoceras zapotecum
 * † Parastroma
 * † Parastroma sp.
 * † Paravascoceras
 * † Paravascoceras angermanni
 * † Paravascoceras carteri
 * † Parazanthopsis
 * † Parazanthopsis meyapaquensis
 * † Paretallonia
 * † Paretallonia hispaniensis
 * † Paronaella – tentative report
 * † Paronaella
 * † Paronaella broennimanni
 * † Paronaella carteri
 * † Paronaella corpulenta
 * † Paronaella festiva
 * † Paronaella grahamensis
 * † Paronaella multifera – or unidentified comparable form
 * † Paronaella multifera
 * † Paronaella notabilis – type locality for species
 * † Paronaella notabilis
 * † Paronaella obesa – or unidentified comparable form
 * † Paronaella pristidentata – or unidentified comparable form
 * † Paronaella snowshoensis
 * † Paronaella sp.
 * † Paronaella sp. Ainformal
 * † Paronaella sp. Binformal
 * † Paronaella sp. Cinformal
 * † Paronaella variabilis
 * † Paronella
 * † Paronella sp.
 * † Parrasites
 * † Parrasites victoriensis – or unidentified comparable form
 * † Parrasites victoriensis
 * † Parvicingula – tentative report
 * † Parvicingula
 * † Parvicingula colemani
 * † Parvicingula enormis
 * † Parvicingula excelsa
 * † Parvicingula jonesi – or unidentified comparable form
 * † Parvicingula sp.
 * † Parvicingula yehae
 * † Parvivacca
 * † Parvivacca blomei
 * † Parvivacca simplex – or unidentified comparable form
 * † Parvivacca simplex
 * † Pecopteris
 * † Pecopteris falcatus
 * † Pecten
 * † Pecten morrisi – or unidentified comparable form
 * † Pecten roemeri
 * † Pecten sp.
 * † Pecten subalpina
 * † Pecten texanus
 * † Pedioceras
 * † Pedioceras sp.
 * † Pelourdea
 * † Pelourdea sp.
 * † Pelourdia
 * † Pelourdia sp.
 * † Peltocrioceras – tentative report
 * † Peltocrioceras sp.
 * † Penaceras
 * † Penaceras rursiradiatus
 * † Penaceras stoyanovi – type locality for species
 * † Penecallista
 * † Penecallista marina
 * † Pentacoenia
 * † Pentacoenia pulchella
 * † Pentacrinus
 * † Pentacrinus sp.
 * † Perezlaria
 * † Perezlaria oaxacensis
 * † Periplomya
 * † Periplomya sulcatina
 * † Perispyridium
 * † Perispyridium delicatumaff.
 * † Perispyridium delicatum
 * † Perispyridium neotamanense
 * † Perispyridium sp.
 * † Perispyridium tamanense
 * † Perissitys
 * † Perissitys colocara
 * † Perissoptera – tentative report
 * † Perissoptera sp.
 * † Permocalculus
 * † Permocalculus sp.
 * † Peroniceras
 * † Peroniceras sp.
 * † Peroniceras subtricarinatumaff.
 * † Peroniceras subtricarinatun – or unidentified comparable form
 * † Peroniceras tricarinatumaff.
 * † Peroniceras tridorsatum
 * † Peruviella
 * † Peruviella gerthi
 * † Peruviella sp.
 * † Petalodontia
 * † Petalodontia sp.
 * † Phacellocoenia
 * † Phacellocoenia tolmachoffana
 * † Phaneroptyxis
 * † Phaneroptyxis anguillina
 * † Phantum
 * † Phantum insperatum
 * † Phaulostephanus
 * † Phaulostephanus burckhardti – type locality for species
 * † Phlebopteris
 * † Phlebopteris angustiloba
 * † Phlebopteris branneri
 * † Phlebopteris smithii
 * † Pholadomya – or unidentified comparable form
 * † Pholadomya
 * † Pholadomya ambigua – or unidentified comparable form
 * † Pholadomya coahuilensis
 * † Pholadomya diegoensis
 * † Pholadomya fidicula – or unidentified comparable form
 * † Pholadomya fidicula
 * † Pholadomya gigantea – or unidentified comparable form
 * † Pholadomya gigantea
 * † Pholadomya idea
 * † Pholadomya pedernalis – or unidentified comparable form
 * † Pholadomya sanctae-crucis
 * † Pholadomya sp.
 * † Pholadomya voltzi – or unidentified comparable form
 * † Phylloceras – or unidentified comparable form
 * † Phylloceras
 * † Phylloceras serum
 * † Phylloceras sp.
 * † Phylloceras velledae
 * † Phyllopachyceras
 * † Phyllopachyceras forbesianum
 * † Phyllotheca – tentative report
 * † Phyllotheca sp.
 * † Phymosoma
 * † Phymosoma volanum – or unidentified comparable form
 * † Physa
 * † Physa copeiaff.
 * † Piazopteris – tentative report
 * † Piazopteris sp.
 * † Pinna – or unidentified comparable form
 * † Pinna
 * † Pinna folium – or unidentified comparable form
 * † Pinna laqueata
 * † Pinna quadrifrons
 * † Pinna sp.
 * † Pisotrigonia
 * † Pisotrigonia sp.
 * † Placenticeras
 * † Placenticeras fritschi
 * † Placenticeras syrtale
 * † Placenticeras whitfieldi
 * † Placocoenia
 * † Placocoenia major
 * † Placocoenia sp. – type locality for species
 * † Placophyllia
 * † Placophyllia bandeli
 * † Placophyllia chihuahuensis – type locality for species
 * † Placopsilina
 * † Placopsilina sp.
 * † Placosmilia
 * † Placosmilia sp.
 * † Placunopsis
 * † Placunopsis sp.
 * † Plafkerium
 * † Plafkerium abbotti – type locality for species
 * † Plafkerium abbotti
 * † Plafkerium hindei – type locality for species
 * † Plafkerium hindei
 * † Plagioptychus
 * † Plagioptychus agariciformis
 * † Plagioptychus jamaicensis
 * † Plagioptychus muellerriedi
 * † Plagioptychus sp.
 * † Plagiostoma
 * † Plagiostoma exaltata – or unidentified comparable form
 * † Plagiostoma kanei
 * † Plagiostoma punctatum – or unidentified comparable form
 * † Plagiostoma schimperi
 * † Plagiostoma sp. Ainformal
 * † Planolites
 * † Planolites sp.
 * † Platycaryaaff.
 * † Platycarya – or unidentified comparable form
 * † Platycarya sp.
 * † Pleesus
 * † Pleesus sp. Ainformal
 * † Plesiastrea – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Plesiastrea
 * † Plesiastrea moravica – type locality for species
 * † Plesiastrea sulcatilamellosa
 * † Plesiosaurus – type locality for genus
 * † Plesiosaurus mexicanus – type locality for species
 * † Pleuromya
 * † Pleuromya sp.
 * † Pleuromya tellina
 * † Pleuromya uniformis
 * † Pleurophyllia
 * † Pleurophyllia microsa – type locality for species
 * † Pleurophyllia trichotomaaff.
 * † Pleurostylina
 * † Pleurostylina major – type locality for species
 * † Pleurotomaria
 * † Pleurotomaria sp.
 * † Pleurotomaria sp. Binformal
 * † Plicatulaaff.
 * † Plicatula
 * † Plicatula azulensis
 * † Plicatula batnensis
 * † Plicatula incongrua
 * † Plicatula pulchra
 * † Plicatula sp. – type locality for species
 * † Plicatula sp.
 * † Plicatula sp. Ainformal
 * † Plicatula subgurgitis
 * † Plicatula torreoensis
 * † Plicatula umbonata
 * † Podobursa
 * † Podobursa lata
 * † Podobursa rosea
 * † Podobursa sp.
 * † Podobursa tetracola
 * † Podobursa triacantha
 * † Podocapsa – tentative report
 * † Podocapsa
 * † Podocapsa abreojosensis – type locality for species
 * † Podocapsa abreojosensis
 * † Podocapsa amphitreptera – or unidentified comparable form
 * † Podocapsa amphitreptera
 * † Podocapsa foremanae
 * † Podocapsa sp.
 * † Podocapsa sp. Ainformal
 * † Podophthalmus
 * † Podophthalmus sp.
 * † Podozamites
 * † Podozamites sp.
 * † Polyphylloseris
 * † Polyphylloseris conophora
 * † Polyphylloseris convexa
 * † Polyphylloseris distefanoi
 * † Polyphylloseris iwateensis
 * † Polyphylloseris polymorpha
 * † Polyptychites
 * † Polyptychites sp.
 * † Polyptychoceras
 * † Polyptychoceras sp.
 * † Polystrata
 * † Polystrata alba
 * † Polytremacis
 * † Polytremacis tehuacanensis
 * † Polzia
 * † Polzia eldoctorensis
 * † Porituberoolithus
 * † Porituberoolithus sp.
 * † Potamides
 * † Potamides ancestralus
 * † Potamides temalacensis
 * † Potosites – type locality for genus
 * † Potosites
 * † Potosites tristantorresi – type locality for species
 * † Potosites tristantorresi
 * † Praebarrettia
 * † Praebarrettia sparcilirata
 * † Praecaprina
 * † Praecaprina sp.
 * † Praechrysalidina
 * † Praechrysalidina infracretacea
 * † Praechrysalidina sp.
 * † Praeconocaryomma
 * † Praeconocaryomma bajaensis
 * † Praeconocaryomma decoraex gr.
 * † Praeconocaryomma mediaaff.
 * † Praeconocaryomma scatebra
 * † Praeconocaryomma sp.
 * † Praeconosphaera
 * † Praeconosphaera multiconus
 * † Praeconosphaera sphaeroconus – or unidentified comparable form
 * † Praeconosphaera sphaeroconus
 * † Praeconosphaera spinosa
 * † Praeglobotruncana
 * † Praeglobotruncana rioensis
 * † Praehexasaturnalis
 * † Praehexasaturnalis tetraradiatus
 * † Praeparvicingula – tentative report
 * † Praeparvicingula
 * † Praeparvicingula blomei
 * † Praeparvicingula discors
 * † Praeparvicingula holdsworthi
 * † Praeparvicingula sp.
 * † Prehepatus
 * † Prehepatus harrisi
 * † Preverastraea
 * † Preverastraea coatlicuae – type locality for species
 * † Preverastraea coatlicuae
 * † Preverastraea felixi
 * † Preverastraea paronai
 * † Preverastraea roveretoi
 * † Preverastraea tocae – type locality for species
 * † Preverastraea tocae
 * † Prionocyclus
 * † Prionocyclus hyatti
 * † Prisconatica
 * † Prisconatica pedernalis
 * † Prismatoolithus – tentative report
 * † Prismatoolithus sp.
 * † Procerithium – tentative report
 * † Procerithium
 * † Procerithium beali
 * † Procerithium fraasi
 * † Procerithium kirki
 * † Procerithium poblana
 * † Prohinnites
 * † Prohinnites ordonesi
 * † Prolyelliceras
 * † Prolyelliceras prorsocurvatumaff.
 * † Promathildia
 * † Promathildia sp.
 * † Proniceras
 * † Proniceras sp.
 * † Propeamussium
 * † Propeamussium schafhaeutli – or unidentified comparable form
 * † Prosogyrotrigonia
 * † Prosogyrotrigonia sp. Ainformal
 * † Protaegla
 * † Protaegla miniscula
 * † Protaegla minuscula
 * † Protancyloceras
 * † Protancyloceras catalinense – or unidentified comparable form
 * † Protancyloceras sp.
 * † Protocallianassa
 * † Protocallianassa sp.
 * † Protocardia – tentative report
 * † Protocardia
 * † Protocardia dufrenoyca
 * † Protocardia luggudensis
 * † Protocardia pesolina – or unidentified comparable form
 * † Protocardia sp.
 * † Protocardia sp. Ainformal
 * † Protocardia stonei
 * † Protocardia striatula
 * † Protocardia texana – tentative report
 * † Protocardia texana – or unidentified comparable form
 * † Protocardia texana
 * † Protocardia truncata
 * † Protochelydra – or unidentified comparable form
 * † Protochelydra sp.
 * † Protoplatyrhina
 * † Protoplatyrhina sp.
 * † Protovallupus
 * † Protovallupus excellens
 * † Protovallupus sp.
 * † Protovallupus sp. Ainformal
 * † Protovallupus sp. Binformal
 * † Protovallupus tetlamaensis
 * † Protovallupus vaticinus
 * † Pseudaspidoceras
 * † Pseudaspidoceras flexuosum
 * † Pseudaspidoceras footeanum
 * † Pseudaspidoceras pseudonodosoides
 * † Pseudaspidoceras sp.
 * † Pseudocrucella
 * † Pseudocrucella haeckeli
 * † Pseudocrucella sp.
 * † Pseudoctenis – or unidentified comparable form
 * † Pseudoctenis
 * † Pseudoctenis lanei
 * † Pseudoctenis sp.
 * † Pseudocyclammina
 * † Pseudocyclammina lituus
 * † Pseudocyclammina sp.
 * † Pseudocymia – tentative report
 * † Pseudocymia kilmeri – type locality for species
 * † Pseudoepimastopora
 * † Pseudoepimastopora jurassica
 * † Pseudoeucyrtis
 * † Pseudoeucyrtis angusta
 * † Pseudoguembelina
 * † Pseudoguembelina excolata
 * † Pseudohagiastrum
 * † Pseudohagiastrum monstruosum
 * † Pseudohagiastrum sp.
 * † Pseudohaploceras
 * † Pseudohaploceras aguilerae
 * † Pseudohaploceras jacobi
 * † Pseudohaploceras liptoviense
 * † Pseudohaploceras matheroni – or unidentified comparable form
 * † Pseudohaploceras matheroni
 * † Pseudohaploceras reesdei
 * † Pseudohaploceras reesidei
 * † Pseudoheliodiscus
 * † Pseudoheliodiscus alpinusaff.
 * † Pseudoheliodiscus finchi – type locality for species
 * † Pseudoheliodiscus finchi
 * † Pseudoheliodiscus sp.
 * † Pseudoheliodiscus viejoensis – type locality for species
 * † Pseudoheliodiscus viejoensis
 * † Pseudohigumastra
 * † Pseudohigumastra minuta – or unidentified comparable form
 * † Pseudohigumastra minuta
 * † Pseudolimea – tentative report
 * † Pseudolimea
 * † Pseudolimea sp.
 * † Pseudolimea sp. Ainformal
 * † Pseudolituonella
 * † Pseudolituonella sp. – tentative report
 * † Pseudomyriophyllia
 * † Pseudomyriophyllia carpathica – or unidentified comparable form
 * † Pseudomyriophyllia carpathica
 * † Pseudomyriophyllia sp.
 * † Pseudomyriophyllia turnsekae
 * † Pseudonerinea
 * † Pseudonerinea stantoni
 * † Pseudonerinea stirtoni
 * † Pseudopetalodontia – type locality for genus
 * † Pseudopetalodontia felixi
 * † Pseudopisthophyllum
 * † Pseudopisthophyllum quinqueseptatum
 * † Pseudoplicapollis
 * † Pseudoplicapollis sp.
 * † Pseudopoulpus
 * † Pseudopoulpus sp. Ainformal
 * † Pseudorhaetina
 * † Pseudorhaetina antimoniensis – type locality for species
 * † Pseudorhaetina antimoniensis
 * † Pseudoschloenbachia
 * † Pseudoschloenbachia mexicanaaff.
 * † Pseudoschloenbachia mexicana
 * † Pseudosculdidae
 * † Pseudosculdidae sp.
 * † Pseudosubplanites
 * † Pseudosubplanites jauberti – or unidentified comparable form
 * † Pseudotextularia
 * † Pseudotextularia elegans
 * † Pseudotextularia intermedia
 * † Pseudotissotia
 * † Pseudotissotia galliennei
 * † Pseudotissotia nigeriense – or unidentified comparable form
 * † Pseudoxybeloceras
 * † Pseudoxybeloceras sp.
 * † Psilogyra
 * † Psilogyra greaca – or unidentified comparable form
 * † Psilotissotia
 * † Psilotissotia sp.
 * † Pteraichnus – or unidentified comparable form
 * † Pteraichnus
 * † Pteraichnus sp.
 * † Pteria
 * † Pteria aguilerae
 * † Pterocerella
 * † Pterocerella sp.
 * † Pterophyllum – tentative report
 * † Pterophyllum
 * † Pterophyllum fragile
 * † Pterophyllum inaequale
 * † Pterophyllum longifolium
 * † Pterophyllum munsteri – or unidentified comparable form
 * † Pterophyllum propiquum
 * † Pterophyllum rajmahalense
 * † Pterophyllum robustum
 * † Pterophyllum sp.
 * † Pterophyllum spinosum – type locality for species
 * † Pterophyllum spp.
 * † Pterotrigonia – tentative report
 * † Pterotrigonia
 * † Pterotrigonia plicatocostata
 * † Pterotrigonia sp.
 * † Pterotrigonia stolleyi
 * † Ptilophyllum – or unidentified comparable form
 * † Ptilophyllum
 * † Ptilophyllum acutifolium
 * † Ptilophyllum cutchense
 * † Ptilophyllum sp.
 * † Ptilorhynchia
 * † Ptilorhynchia durangensis
 * † Ptilorhynchia imlayi – type locality for species
 * † Ptychoceras
 * † Ptychoceras gracillimum
 * † Ptychoceras mazapilense
 * † Ptychodus
 * † Ptychodus mortoni – or unidentified comparable form
 * † Ptychomya
 * † Ptychomya densicostata – tentative report
 * † Ptychomya stantoni
 * † Ptychotrygon
 * † Ptychotrygon sp.
 * † Pugnellus
 * † Pugnellus densatus
 * † Pulchellia
 * † Pulchellia sp.
 * † Purpuroidea – tentative report
 * † Purpuroidea acatlana
 * † Puzosia
 * † Puzosia austeniaff.
 * † Puzosia kilianiaff.
 * † Puzosia kiliani – or unidentified comparable form
 * † Puzosia mayorianaaff.
 * † Puzosia mayoriana – or unidentified comparable form
 * † Puzosia nolaniaff.
 * † Puzosia provincialeaff.
 * † Puzosia serratocarinata – type locality for species
 * † Puzosia sp.
 * † Pycnodonte
 * † Pycnodonte sp.
 * † Pycnodonte vesicularis
 * † Pygopyrina
 * † Pygopyrina sp.
 * † Pyrazus
 * † Pyrazus austinense
 * † Pyrazus durhami
 * † Pyrazus maldonadoi – type locality for species
 * † Pyrazus maldonadoi
 * † Pyrazus scalariformis – or unidentified comparable form
 * † Pyrazus sp.
 * † Pyrazus valeriae
 * † Pyrgo
 * † Pyrgo sp. – or unidentified comparable form
 * † Pyrgopolon
 * † Pyrgopolon macropus
 * † Pyropsis
 * † Pyropsis lanhami
 * † Pyzarus – tentative report
 * † Pyzarus harrissi
 * † Quadratotrigonia
 * † Quadratotrigonia guildi
 * † Quadratotrigonia mearnsi
 * † Quercus
 * † Quercus sp.
 * † Quetzalichthys – type locality for genus
 * † Quetzalichthys perrilliatae – type locality for species
 * † Quinqueloculina
 * † Quinqueloculina sp.
 * † Quitmaniceras
 * † Quitmaniceras reaseri
 * † Radiolites – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Radiolites
 * † Radiolites acutocostata
 * † Radiolites costata – or unidentified comparable form
 * † Radiolites costata
 * † Radiolites macroplicatus
 * † Radiolites sp.
 * † Rastellum
 * † Rastellum sp.
 * † Rectocyclammina
 * † Rectocyclammina chouberti
 * † Religa
 * † Religa globosa – type locality for species
 * † Religa globosa
 * † Remera
 * † Remera sp.
 * † Reptomulticava
 * † Reptomulticava sp.
 * † Requienia
 * † Requienia sp.
 * † Resatrix
 * † Resatrix sp.
 * † Retinomocolpites
 * † Retinomocolpites sp.
 * † Retiophyllia
 * † Retiophyllia norica
 * † Retiophyllia opelli – or unidentified comparable form
 * † Retiophyllia oppeli
 * † Retiophyllia sp.
 * † Rhabdocarpus
 * † Rhabdocarpus sp.
 * † Rhabdoceras
 * † Rhabdoceras suessi – or unidentified comparable form
 * † Rhacolephis – or unidentified comparable form
 * † Rhacolephis sp.
 * † Rhinobatos
 * † Rhinobatos sp.
 * † Rhipidastraea
 * † Rhipidastraea soukupi
 * † Rhipidomeandra
 * † Rhipidomeandra bugrovae
 * † Rhynchodercetis
 * † Rhynchodercetis regio
 * † Rhynchonella – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Rhynchonella
 * † Rhynchonella apicalisaff.
 * † Rhynchonella durangensis – type locality for species
 * † Rhynchonella durangensis
 * † Rhynchonella miquihuanensis
 * † Rhynchonella nuciformis
 * † Rhynchonella sp.
 * † Rhytidoplites
 * † Rhytidoplites robertsi
 * † Richardoestesia
 * † Richardoestesia isosceles
 * † Rimella
 * † Rimella mexcala – type locality for species
 * † Ringicula
 * † Ringicula clarki – or unidentified comparable form
 * † Ristola
 * † Ristola firma
 * † Rodighieroites
 * † Rodighieroites belimelensis
 * † Roemerus
 * † Roemerus robustus
 * † Romaniceras
 * † Romaniceras kanei
 * † Romaniceras mexicanum
 * † Romaniceras ornatissimum
 * † Romaniceras reymenti
 * † Romaniceras sp.informal
 * † Romaniceras sp.
 * † Rosita
 * † Rosita fornicata
 * † Rotalipora
 * † Rotalipora appenninica
 * † Rotalipora sp.
 * † Rugoglobigerina
 * † Rugoglobigerina hexacamerata
 * † Rugoglobigerina macrocephala
 * † Rugoglobigerina rugosa
 * † Rugotruncana
 * † Rugotruncana subpenny
 * † Rutitrigonia
 * † Rutitrigonia weaveri
 * † Sabinosuchus – type locality for genus
 * † Sabinosuchus coahuilensis – type locality for species
 * † Sagenopteris
 * † Sagenopteris sp.
 * † Saitoum – tentative report
 * † Saitoum sp.
 * † Salenia
 * † Salenia texana
 * † Salinites
 * † Salinites grossicostatum
 * † Salinites inflatum
 * † Saltocyathus
 * † Saltocyathus cumburindioensis – type locality for species
 * † Salvinia
 * † Salvinia coahuilensis
 * † Santonaella
 * † Santonaella longoriai
 * † Santonaella obesa – or unidentified comparable form
 * † Santonaella obesa
 * † Saracenaria
 * † Saracenaria bononiensis
 * † Saracenaria sp.
 * † Sarasinella – tentative report
 * † Sarasinella sp.
 * † Sarla
 * † Sarla natividadensis – type locality for species
 * † Sarla natividadensis
 * † Sarla prietoensis – type locality for species
 * † Sarla prietoensis
 * † Sarla sp.
 * † Sarla sp. Ainformal
 * † Sarla sp. Binformal
 * † Sarla vetusta – type locality for species
 * † Sarla vetusta
 * † Sarla vizcainoensis – type locality for species
 * † Sarla vizcainoensis
 * † Sauvagesia
 * † Sauvagesia coloradensis – or unidentified comparable form
 * † Sauvagesia morgani – type locality for species
 * † Sauvagesia sp.
 * † Sauvagesia texana
 * † Scapanorhynchus – or unidentified comparable form
 * † Scapanorhynchus
 * † Scapanorhynchus sp.
 * † Scaphites
 * † Scaphites aequalisaff.
 * † Scaphites bosquensis – or unidentified comparable form
 * † Scaphites bosquensis
 * † Scaphites frontierensis
 * † Scaphites hippocrepisex gr.
 * † Scaphites hugardianus – or unidentified comparable form
 * † Scaphites meslei
 * † Scaphites preventricosus
 * † Scaphites uintensis
 * † Schafhaeutlia
 * † Schafhaeutlia sp.
 * † Schizorhiza
 * † Schizorhiza stromeri
 * † Schloenbachia
 * † Schloenbachia chihauhuensis
 * † Schloenbachia utaturensis – or unidentified comparable form
 * † Schneidia
 * † Schneidia lopeztichai – type locality for species
 * † Sciponoceras
 * † Sciponoceras baculoideaff.
 * † Sciponoceras baculoide – or unidentified comparable form
 * † Scoresbya
 * † Scoresbya dentata
 * † Scoresbya pinnata
 * † Scotiophryne
 * † Scotiophryne sp.
 * † Selaginella
 * † Selaginella sp.
 * † Sellithyris
 * † Sellithyris coahuilensis
 * † Selwynoceras
 * † Selwynoceras mexicanum
 * † Semineritina
 * † Semineritina apparata
 * † Septocardia
 * † Septocardia sp.
 * † Serpula
 * † Serpula socialisaff.
 * † Serratolamna
 * † Serratolamna serrata
 * † Sethocapsa
 * † Sethocapsa sp.
 * † Sharpeiceras
 * † Sharpeiceras laticlavium
 * † Shastasaurus
 * † Shastasaurus pacificus
 * † Siderastrea
 * † Siderastrea adkinsi
 * † Siderastrea vancouverensis
 * † Siderofungia – tentative report
 * † Siderofungia
 * † Siderofungia irregularis
 * † Siderofungia zitteli
 * † Silesites
 * † Silesites sp.
 * † Sirenites
 * † Sirenites nanseni
 * † Sirenites ovinus
 * † Sodakus
 * † Sodakus mexicanus
 * † Solenoceras
 * † Solenoceras elegans
 * † Solenoceras texanum
 * † Solenopora – or unidentified comparable form
 * † Solenopora sp.
 * † Somphocrinus – type locality for genus
 * † Somphocrinus mexicanus – type locality for species
 * † Sonoraphyllum – type locality for genus
 * † Sonoraphyllum mirabile – type locality for species
 * † Spathites
 * † Spathites coahuilensis
 * † Spathites puercoensis
 * † Spathites rioensis – type locality for species
 * † Spathites sp.
 * † Sphaera – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Sphaera
 * † Sphaera americanus
 * † Sphaera corrugata
 * † Sphaera sp.
 * † Sphaeromatidae
 * † Sphaeromatidae sp.
 * † Sphagnum
 * † Sphagnum sp.
 * † Sphenodiscus
 * † Sphenodiscus aberrans – type locality for species
 * † Sphenodiscus intermedius
 * † Sphenodiscus lobatus
 * † Sphenodiscus pleurisepta
 * † Sphenodiscus prepleurisepta
 * † Sphenodiscus sp.
 * † Sphenopteris
 * † Sphenopteris goeppertii
 * † Sphenopteris sp.
 * † Sphenovipera – type locality for genus
 * † Sphenovipera jimmysjoyi – type locality for species
 * † Sphenozamites
 * † Sphenozamites sp.
 * † Spheroolithus
 * † Spheroolithus sp.
 * † Spiticeras
 * † Spiticeras kilianiaff.
 * † Spondylospira
 * † Spondylospira lewesensis
 * † Spondylus
 * † Spondylus oballosensis
 * † Spondylus sp.
 * † Spondylus subnodosus
 * † Spriogmoceras
 * † Spriogmoceras shastense
 * † Squalicorax
 * † Squalicorax bassanii – or unidentified comparable form
 * † Squalicorax sp.
 * † Squatirhina
 * † Squatirhina sp.
 * † Stangerites
 * † Stangerites sp.
 * † Stauromesosaturnalis
 * † Stauromesosaturnalis deweveri – type locality for species
 * † Stauromesosaturnalis deweveri
 * † Stelidioseris
 * † Stelidioseris minima
 * † Stenopteris
 * † Stenopteris desmomera – or unidentified comparable form
 * † Stephanoceras
 * † Stephanoceras boulderense
 * † Stephanoceras skidegatense – or unidentified comparable form
 * † Stephanoceras sp.
 * † Stephanodus – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Stephanodus sp.
 * † Stephanophyllia
 * † Stephanophyllia cribraria
 * † Stephanosphinctes – type locality for genus
 * † Stephanosphinctes buitroni – type locality for species
 * † Stiboriopsis
 * † Stiboriopsis azteca – type locality for species
 * † Stiboriopsis sonoraensis – type locality for species
 * † Stiboriopsis sonoraensis
 * † Stichocapsa
 * † Stichocapsa sp. Ainformal
 * † Stichomitra – tentative report
 * † Stichomitra matsuokai
 * † Stoliczkaia
 * † Stoliczkaia crotaloides
 * † Stoliczkaia scotti
 * † Stoliczkaia sp.
 * † Stoliczkaia texana
 * † Stomiosphaera
 * † Stomiosphaera sphaerica
 * † Stramentum
 * † Stramentum sp.
 * † Striarca
 * † Striarca sp.
 * † Striaticostatum
 * † Striaticostatum bexarense – or unidentified comparable form
 * † Striatornata – type locality for genus
 * † Striatornata
 * † Striatornata sanantoniensis – type locality for species
 * † Striatornata sanantoniensis
 * † Strigoceras
 * † Strigoceras kellumi – or unidentified comparable form
 * † Strigoceras pseudostrigifer – or unidentified comparable form
 * † Stromaporidium
 * † Stromaporidium lamellatum – type locality for species
 * † Stygimys – tentative report
 * † Stygimys sp.
 * † Stylangia
 * † Stylangia neocomiensis
 * † Stylina
 * † Stylina bullosa
 * † Stylina inwaldensis
 * † Stylina lobata
 * † Stylina pachystylina
 * † Stylina regularis
 * † Stylina sablensis
 * † Stylina sugiyamai
 * † Stylosmilia
 * † Stylosmilia gregorii
 * † Subcollina
 * † Subcollina lucretia
 * † Subpulchellia
 * † Subpulchellia sp.
 * † Subvenericardia
 * † Subvenericardia sp.
 * † Suna
 * † Suna echiodes – or unidentified comparable form
 * † Suna pessagnoi – type locality for species
 * † Suna sp.
 * † Supervallupus
 * † Supervallupus haeckeli
 * † Supervallupus sp.
 * † Sutneria
 * † Sutneria sp.
 * † Sympolycyclus
 * † Sympolycyclus nodifer
 * † Synastrea
 * † Synastrea agaricites – or unidentified comparable form
 * † Synastrea bellula
 * † Synastrea decipiens
 * † Syncyclonema
 * † Syncyclonema sp.
 * † Syringocapsa
 * † Syringocapsa lata
 * † Syringocapsa sp.
 * † Syringocapsa suavis
 * † Taeniopteris
 * † Taeniopteris elegans
 * † Taeniopteris oaxacensis – type locality for species
 * † Taeniopteris oaxacensis
 * † Tamaulipasaurus – type locality for genus
 * † Tamaulipasaurus morenoi – type locality for species
 * † Tampsia
 * † Tampsia floriformis
 * † Tancredia
 * † Tancredia subcurtansata – or unidentified comparable form
 * † Taraisites
 * † Taraisites tenuicostatus
 * † Taramelliceras
 * † Taramelliceras sp.
 * † Tectus – tentative report
 * † Tectus
 * † Tectus texanus
 * † Tectus thalmanni
 * † Tectus tomasensis
 * † Teichertus
 * † Teichertus cavernosus
 * † Teichertus splendicus
 * † Tellina
 * † Tellina sp.
 * † Teoichthys
 * † Teoichthys brevipina – type locality for species
 * † Teoichthys kallistos
 * † Tepexicarcinus
 * † Tepexicarcinus tlayuaensis
 * † Tepexichthys
 * † Tepexichthys aranguthyrom
 * † Tepexisaurus – type locality for genus
 * † Tepexisaurus tepexii – type locality for species
 * † Tepeyacia
 * † Tepeyacia corrugata
 * † Tepeyacia gregaria
 * † Terebratula
 * † Terebratula coahuilensis
 * † Terebratula kanei
 * † Terebratula sillimani
 * † Terebratula tamaulipana
 * † Tetraditryma – tentative report
 * † Tetraditryma
 * † Tetraditryma emilei
 * † Tetraditryma pseudoplena
 * † Tetraditryma sp.
 * † Tetragonites
 * † Tetragonites silencioensis – type locality for species
 * † Tetragonites zacatecanum
 * † Tetratrabs – tentative report
 * † Tetratrabs
 * † Tetratrabs bulbosa
 * † Tetratrabs sp. Ainformal
 * † Tetratrabs sp. Binformal
 * † Tetratrabs zealis
 * † Tetriastrum
 * † Tetriastrum tenue
 * † Texanites
 * † Texanites dentatocarinata
 * † Texicaprina
 * † Texicaprina kugleri
 * † Texicaprina sp.
 * † Texicaprina vivari
 * † Textularia
 * † Textularia chapmani – tentative report
 * † Thalassinoides
 * † Thalassinoides sp.
 * † Thamnarea
 * † Thamnarea hornosensis – type locality for species
 * † Thamnasteria
 * † Thamnasteria felixi – type locality for species
 * † Thamnasteria lamourouxii – or unidentified comparable form
 * † Thamnasteria mcoyi
 * † Thamnasteria tonantzinae – type locality for species
 * † Thamnoseris – tentative report
 * † Thamnoseris
 * † Thamnoseris arborescens
 * † Thamnoseris arnaudi
 * † Thamnoseris dolerenzoi
 * † Thaumatopteris
 * † Thaumatopteris kochibei – or unidentified comparable form
 * † Thecidiosmilia
 * † Thecidiosmilia morycowae
 * † Thecosmilia – type locality for genus
 * † Thecosmilia
 * † Thecosmilia bassanii
 * † Thecosmilia guerreroensis – type locality for species
 * † Thecosmilia longimana
 * † Thecosmilia oaxaquensis – type locality for species
 * † Thecosmilia sandbergeri
 * † Thecosmilia tobleri
 * † Thetisolala
 * † Thetisolala oblonga
 * † Thirastylon
 * † Thirastylon chubby
 * † Thomasites
 * † Thomasites adkinsi
 * † Thurmanniceras
 * † Thurmanniceras novhispanicus
 * † Thurmanniceras sp.
 * † Thurmanniceras thurmanni
 * † Thurmannites – or unidentified comparable form
 * † Thurmannites
 * † Thurmannites angusticostatus
 * † Thurmannites miquihuanensis
 * † Thurmannites novihispanicus
 * † Thyrastylon
 * † Thyrastylon chubbi
 * † Tirolites
 * † Tirolites sp.
 * † Titanosarcolites
 * † Titanosarcolites giganteus
 * † Titanosarcolites macgillavryi
 * † Tlahualiloceras
 * † Tlahualiloceras tlahualiloensis – type locality for species
 * † Todites
 * † Todites carrilloi
 * † Toretocnemus
 * † Toretocnemus californicus
 * † Torgnellus
 * † Torgnellus sp.
 * † Torreites
 * † Torreites sanchezi
 * † Tototlmimus – type locality for genus
 * † Tototlmimus packardensis – type locality for species
 * † Toucasia
 * † Toucasia hancockensis
 * † Toucasia polygyra – type locality for species
 * † Toucasia sp.
 * † Toxaster
 * † Toxaster sp.
 * † Trachysagenites
 * † Trachysagenites herbichi
 * † Trachyscaphites
 * † Trachyscaphites sp.
 * † Trachystenoceras
 * † Trachystenoceras gabbi
 * † Trapezium – tentative report
 * † Trapezium
 * † Trapezium diversicostatum
 * † Trapezium subtriangulum
 * † Traskites
 * † Traskites fairbanksi
 * † Traskites sp.
 * † Triactoma – tentative report
 * † Triactoma
 * † Triactoma frequens
 * † Triactoma hidalgoensis – or unidentified comparable form
 * † Triactoma hidalgoensis
 * † Triactoma mexicana
 * † Triactoma paramexicana
 * † Triactoma prolongata
 * † Triactoma rosespitensis
 * † Triactoma sp.
 * † Triactoma spinosa – or unidentified comparable form
 * † Triactoma spinosa
 * † Triactoma tenuspinea
 * † Trichinopolia
 * † Trichinopolia lata – type locality for species
 * † Trichites
 * † Trichites pueblaensis
 * † Tricostatocarpon – type locality for genus
 * † Tricostatocarpon silvapinedae – type locality for species
 * † Trigonarca – tentative report
 * † Trigonarca
 * † Trigonarca depressa – or unidentified comparable form
 * † Trigonarca sp.
 * † Trigonia – or unidentified comparable form
 * † Trigonia
 * † Trigonia carinata
 * † Trigonia caudata
 * † Trigonia guadalupae – or unidentified comparable form
 * † Trigonia ingens
 * † Trigonia sp.
 * † Trigonia stolleyi
 * † Trigonia weaveriaff.
 * † Trigonocarpus
 * † Trigonocarpus sp.
 * † Trionyx
 * † Trionyx sp.
 * † Triplomystus
 * † Triplomystus applegatei – type locality for species
 * † Tripocyclia – tentative report
 * † Tripocyclia
 * † Tripocyclia foremanae
 * † Tripocyclia mascula – or unidentified comparable form
 * † Tripocyclia mascula
 * † Tripocyclia sp.
 * † Tristix
 * † Tristix acutangulum
 * † Tritrabs – tentative report
 * † Tritrabs
 * † Tritrabs casmaliensis – or unidentified comparable form
 * † Tritrabs ewingi
 * † Tritrabs imperfecta
 * † Tritrabs mexicana
 * † Tritrabs worzeli – or unidentified comparable form
 * † Triversus
 * † Triversus japonicus – or unidentified comparable form
 * † Trochactaeon
 * † Trochactaeon coniformis
 * † Trochactaeon punctatus
 * † Trochactaeon teaensis
 * † Trochactaeon wrighti
 * † Trochoceramus
 * † Trochoceramus costaecusaff.
 * † Trochoceramus nahorianensis
 * † Trochoceramus tricostatus – type locality for species
 * † Trochocyathus
 * † Trochocyathus speciosus
 * † Trochoseris
 * † Trochoseris aperta
 * † Trochus
 * † Trochus sp. – type locality for species
 * † Tropites
 * † Tropites dilleri
 * † Trudopollis
 * † Trudopollis pertrudens – or unidentified comparable form
 * † Turbo – tentative report
 * † Turbo gigas
 * † Turbo sp.
 * † Turrilites
 * † Turrilites acutusaff.
 * † Turrilites acutus – or unidentified comparable form
 * † Turrilites carrancoi
 * † Turrilites multipunctatus
 * † Turrilites scheuchzeri
 * † Turrilites scheuchzerianus
 * † Turrilites sp.
 * † Turritella – tentative report
 * † Turritella
 * † Turritella chalybeatensis – or unidentified comparable form
 * † Turritella durhami
 * † Turritella leonensisaff.
 * † Turritella seriatimgranulataaff.
 * † Turritella sp.
 * † Turritella trilira
 * † Turritella vertebroides
 * † Turritella vertibroides
 * † Turritelloidea
 * † Turritelloidea minuta
 * † Tylosaurus
 * † Tylosaurus kansasensis – or unidentified comparable form
 * † Tylostoma – or unidentified comparable form
 * † Tylostoma
 * † Tylostoma aguilerai – type locality for species
 * † Tylostoma allisoni
 * † Tylostoma kentense
 * † Tylostoma laharpi
 * † Tylostoma mutabilis
 * † Tylostoma sp.
 * † Tyrannosaurus
 * † Tyrannosaurus sp.
 * † Tyrsoecus
 * † Tyrsoecus sp.
 * † Udalia
 * † Udalia plana
 * † Uhligella
 * † Uhligella jacobi – or unidentified comparable form
 * † Uhligella jacobi
 * † Uhligella rebouliaff.
 * † Uhligella sp.
 * † Uhligella subnosocostatum
 * † Uhligella wallerantiaff.
 * † Uhligella zurcheri – or unidentified comparable form
 * † Uhligella zurcheri
 * † Unamichthys – type locality for genus
 * † Unamichthys espinosai – type locality for species
 * † Vaccinites
 * † Vaccinites inaequicostatus
 * † Vaccinites macgillavryi
 * † Vaccinites sp.
 * † Vaccinites vermunti
 * † Vaginulina
 * † Vaginulina debilis
 * † Vaginulina kochii
 * † Vaginulinopsis
 * † Vaginulinopsis sp.
 * † Valanginites
 * † Valanginites sp.
 * † Valanginites tijerensis
 * † Vallecillosaurus – type locality for genus
 * † Vallecillosaurus donrobertoi – type locality for species
 * † Vallupus
 * † Vallupus hopsoni
 * † Vallupus japonicus
 * † Vallupus nodosus
 * † Vallupus zeissiaff.
 * † Vallupus zeissi
 * † Valvulineria
 * † Valvulineria sp.
 * † Vascoceras – tentative report
 * † Vascoceras
 * † Vascoceras adunense – or unidentified comparable form
 * † Vascoceras birchbyi
 * † Vascoceras gamai – or unidentified comparable form
 * † Vascoceras harttii
 * † Vascoceras mohovanense – or unidentified comparable form
 * † Vascoceras sp.
 * † Vaugonia
 * † Vaugonia sp.
 * † Veghicyclia
 * † Veghicyclia austriaca – or unidentified comparable form
 * † Velafrons – type locality for genus
 * † Velafrons coahuilensis – type locality for species
 * † Veniella
 * † Veniella coahuilaensis
 * † Veniella coahuiloensis
 * † Veniella jamaicensis – or unidentified comparable form
 * † Veniella sp.
 * † Veniella sp. Binformal
 * † Veracruciceras
 * † Veracruciceras ruizi
 * † Veracruciceras sp.
 * † Vermetus
 * † Vermetus cornejoi
 * † Vermetus sp.
 * † Victoriacaris
 * † Victoriacaris muhiensis
 * † Victoriaconodon – type locality for genus
 * † Victoriaconodon inaequalis – type locality for species
 * † Vinctifer
 * † Vinctifer sp.
 * † Viviparus
 * † Viviparus australis
 * † Voloshinoides
 * † Voloshinoides murgensisaff.
 * † Volutomorpha
 * † Volutomorpha retifera – or unidentified comparable form
 * † Watinoceras – tentative report
 * † Watinoceras
 * † Watinoceras coloradoense
 * † Watinoceras sp.
 * † Weltrichia
 * † Weltrichia sp.
 * † Weyla
 * † Weyla alata
 * † Weyla bodenbenderi
 * † Weyla meeki
 * † Weyla titan
 * † Weyla unca
 * † Wheeleroxylon – type locality for genus
 * † Wheeleroxylon atascosense – type locality for species
 * † Whiteinella
 * † Whiteinella sp.
 * † Williamsonia
 * † Williamsonia cuauhtemoci
 * † Williamsonia diquiyui
 * † Williamsonia huitizilipochtlii
 * † Williamsonia huitzilopochtlii
 * † Williamsonia nathorstii
 * † Williamsonia netzahualcoyotlii
 * † Williamsonia oaxacensis
 * † Williamsonia sp.
 * † Willimactra
 * † Willimactra matthewsoni
 * † Worthenia – tentative report
 * † Worthenia sp.
 * † Wrightoceras
 * † Wrightoceras munieri – or unidentified comparable form
 * † Xandaros
 * † Xandaros sternbergi
 * † Xanthosia
 * † Xanthosia zoquiapensis
 * † Xestosina
 * † Xestosina subsella
 * † Xiaoshuiculana
 * † Xiaoshuiculana tozeri – type locality for species
 * † Xonpepetla – type locality for genus
 * † Xonpepetla rinconensis – type locality for species
 * † Xylophagella
 * † Xylophagella sp.
 * † Yaadia
 * † Yaadia sp.
 * † Yelmochelys – type locality for genus
 * † Yelmochelys
 * † Yelmochelys rosarioae – type locality for species
 * † Yelmochelys rosarioae
 * † Yezoites
 * † Yezoites subevolutus
 * † Zamites
 * † Zamites diquiyui
 * † Zamites feneonis
 * † Zamites fragilisex gr.
 * † Zamites fragilis
 * † Zamites lucerensis
 * † Zamites macombiiaff.
 * † Zamites oaxacensis
 * † Zamites powelliaff.
 * † Zamites sp.
 * † Zamites tribulosus
 * † Zamites truncatus – or unidentified comparable form
 * † Zapatadon – type locality for genus
 * † Zapatadon ejidoensis – type locality for species

Cenozoic

 * † Abaristophora
 * † Abaristophora sp.
 * † Acanthina
 * † Acanthina angelica
 * † Acanthina lugubre
 * † Acanthina lugubris
 * † Acanthina muricata
 * † Acanthina paucilirata
 * † Acanthina spirata
 * † Acanthina tuberculata – or unidentified comparable form
 * † Acanthina tuberculata
 * † Acanthinia
 * † Acanthinia emersoni
 * † Acanthocardia
 * † Acanthocardia brewerii – or unidentified comparable form
 * † Acanthocardia sorrentoense – or unidentified related form
 * † Acanthocybium
 * † Acanthocybium sp.
 * † Acanthodesia
 * † Acanthodesia commensale
 * † Acar
 * † Acar bailyi
 * † Acar domingensis – or unidentified comparable form
 * † Acar domingensis
 * † Acar gradata
 * † Acar sp. – tentative report
 * † Acar sp.
 * † Acesta
 * † Acesta multiradiata
 * † Acilia
 * † Acilia castrensis
 * † Aclistomycter
 * † Aclistomycter middletoni
 * † Acmaea
 * † Acmaea asmi
 * † Acmaea digitalis
 * † Acmaea insessa
 * † Acmaea limatula
 * † Acmaea mesoleuca
 * † Acmaea mitra
 * † Acmaea paleacea
 * † Acmaea pelta
 * † Acmaea persona – or unidentified comparable form
 * † Acmaea persona
 * † Acmaea scabra
 * † Acmaea scutum – or unidentified comparable form
 * † Acmaea scutum
 * † Acmaea sp.
 * † Acropora
 * † Acropora cervicornis
 * † Acropora palmata
 * † Acropora panamensis
 * † Acropora saludensis
 * † Acropora sp.
 * † Acrostichum
 * † Acrostichum mexicanum – type locality for species
 * † Acteocina
 * † Acteocina candei – or unidentified comparable form
 * † Acteocina culcitella
 * † Acteocina inculta
 * † Acteocina lepta
 * † Acteocina melinoides
 * † Acteocina rusa
 * † Actinacis – tentative report
 * † Actinacis
 * † Actinacis barretti – type locality for species
 * † Actinacis barretti – or unidentified comparable form
 * † Actinacis barretti
 * † Actinacis carribensis
 * † Actinacis sp. – tentative report
 * † Actinacis sp.
 * † Actiniscus
 * † Actiniscus pentasterias
 * † Actinocyclina
 * † Actinocyclina aster – or unidentified related form
 * † Actinocyclus
 * † Actinocyclus ehrenbergi
 * † Actinocyclus ingens
 * † Actinocythereis
 * † Actinocythereis grigsbyi
 * † Actinocythereis thomsoni
 * † Actinoptychus
 * † Actinoptychus sp.
 * † Admetula
 * † Admetula zapoteca
 * † Aechmophorus
 * † Aechmophorus occidentalis
 * † Aequipecten
 * † Aequipecten andersoni
 * † Aesopus
 * † Aesopus murmecoon – or unidentified comparable form
 * † Aetiocetus – tentative report
 * † Aetiocetus – or unidentified related form
 * † Aetiocetus sp.
 * † Aetobatus
 * † Aetobatus smithii
 * † Aetobatus sp.
 * † Aetomyleaus
 * † Aetomyleaus sp.
 * † Agaricia
 * † Agaricia agaricites
 * † Agaronia
 * † Agaronia testacea
 * † Agassizia
 * † Agassizia scrobiciilata
 * † Agathiphyllia
 * † Agathiphyllia anguillensis
 * † Agathiphyllia antiguensis
 * † Agathiphyllia hilli
 * † Agathiphyllia roxboroughi
 * † Agathistoma
 * † Agathistoma felipensis
 * † Agathistoma mariana
 * † Agazzizia
 * † Agazzizia sp.
 * † Agelaius
 * † Agelaius phoeniceus
 * † Agladrillia
 * † Agladrillia boesei – or unidentified comparable form
 * † Agladrillia mauryae – or unidentified comparable form
 * † Agriochoerus
 * † Agriochoerus maximus
 * † Agriotes
 * † Agriotes succiniferus – type locality for species
 * † Agriotherium
 * † Agriotherium schneideri – tentative report
 * † Agriotherium schneideri – or unidentified comparable form
 * † Agriotherium schneideri
 * † Agriotherium sp.
 * † Aguascalientia
 * † Aguascalientia wilsoni
 * † Aivukus – type locality for genus
 * † Aivukus
 * † Aivukus cedrosensis – type locality for species
 * † Aivukus cedrosensis
 * † Alabina
 * † Alabina asperoides
 * † Alaptus
 * † Alaptus globosicornis – or unidentified comparable form
 * † Alaptus globosicornis
 * † Alaptus pallidicornis
 * † Alaptus sp.
 * † Albireo – type locality for genus
 * † Albireo
 * † Albireo sp.
 * † Albireo whistleri – type locality for species
 * † Albireo whistleri – or unidentified related form
 * † Albireo whistleri
 * † Alepia
 * † Alepia sp.
 * † Aletes
 * † Aletes squamigerus
 * † Alforjas – or unidentified comparable form
 * † Alforjas
 * † Alforjas sp.
 * † Alforjas taylori
 * † Allamanda
 * † Allamanda carmenensis – type locality for species
 * † Allodesmus – or unidentified related form
 * † Allodesmus
 * † Allodesmus sp.
 * † Alopias
 * † Alopias sp.
 * † Alumeda
 * † Alumeda solorzanokraemerae – type locality for species
 * † Aluralagus
 * † Aluralagus bensonensis – or unidentified comparable form
 * † Alvania
 * † Alvania acutelirata
 * † Alvania purpurea
 * † Alveopora
 * † Alveopora chiapanecae – type locality for species
 * † Amauropsis
 * † Amauropsis alveata – or unidentified comparable form
 * † Amauropsis martinezensis
 * † Amauropsis oviformis – or unidentified comparable form
 * † Amauropsis sp.
 * † Amblypsilopus
 * † Amblypsilopus monicae – type locality for species
 * † Amblypsilopus sp.
 * † Ambocythere
 * † Ambocythere elongata – or unidentified related form
 * † Ambocythere subreticulata
 * † Ambracyptus – type locality for genus
 * † Ambracyptus minutissimus – type locality for species
 * † Americardia
 * † Americardia media
 * † Amiantis
 * † Amiantis callosa
 * † Amiantis communis – or unidentified related form
 * † Amiantis communis – or unidentified comparable form
 * † Ammodochium
 * † Ammodochium rectangulare
 * † Ammospermophilus – or unidentified comparable form
 * † Ammospermophilus
 * † Ammospermophilus jeffriesi – type locality for species
 * † Ammospermophilus sp.
 * † Amnestus
 * † Amnestus guapinolinus – type locality for species
 * † Amphimachairodus
 * † Amphimachairodus coloradensis – or unidentified comparable form
 * † Amphimachairodus coloradensis
 * † Amphissa
 * † Amphissa versicolor
 * † Amphistegina
 * † Amphistegina parvula
 * † Amphistegina pregrimsdalei
 * † Amphistegina sp.
 * † Amphithalamus
 * † Amphithalamus inclusus
 * † Amphithalamus tenuis
 * † Ampullina
 * † Ampullina amphora
 * † Ampullina dumblei – tentative report
 * † Ampullina dumblei
 * † Ampullina mississippiensis
 * † Ampullina quitrinensis – tentative report
 * † Ampullina quitrinensis
 * † Ampullina vaughani
 * † Amusium
 * † Amusium alazanum
 * † Amusium lompocensis
 * † Amusium lyoni
 * † Amusium mortoni
 * † Amusium pourtalesianum
 * † Amusium sp.
 * † Amussiopecten
 * † Amussiopecten vanvlecki – or unidentified comparable form
 * † Amydrocarcinus
 * † Amydrocarcinus dantei – type locality for species
 * † Amydrocarcinus dantei
 * † Amydrocarcinus tepetate
 * † Amynodontopsis – or unidentified comparable form
 * † Amynodontopsis sp.
 * † Anacaena
 * † Anacaena sp.
 * † Anacardites
 * † Anacardites lanceolatus – type locality for species
 * † Anachis
 * † Anachis mira
 * † Anachis sp.
 * † Anadara
 * † Anadara actinophora
 * † Anadara arata
 * † Anadara formosa
 * † Anadara inutilis – or unidentified comparable form
 * † Anadara inutilis
 * † Anadara lienosa
 * † Anadara multicostata – or unidentified comparable form
 * † Anadara multicostata
 * † Anadara telemba
 * † Anadara topangensis
 * † Anadara trilineata
 * † Anadara tuberculosa
 * † Anadara veatchi – or unidentified comparable form
 * † Anadara woodringi
 * † Anaphes
 * † Anaphes sp.
 * † Anaplecta
 * † Anaplecta sp.
 * † Anas
 * † Anas acuta
 * † Anas clypeata
 * † Anas discors
 * † Anas sp.
 * † Anatolikos
 * † Anatolikos undecimspinosus
 * † Anbarrhacus – type locality for genus
 * † Anbarrhacus adamantis – type locality for species
 * † Ancilla
 * † Ancilla alazana
 * † Ancilla sp.
 * † Ancillaria
 * † Ancillaria subglobosa – tentative report
 * † Anguinella
 * † Anguinella virginica
 * † Angulus
 * † Angulus buttoni
 * † Anhinga
 * † Anhinga anhinga
 * † Annulites – type locality for genus
 * † Annulites mexicana – type locality for species
 * † Anolis
 * † Anolis electrum – type locality for species
 * † Anomalocardia
 * † Anomalocardia subimbricata – or unidentified comparable form
 * † Anomia
 * † Anomia inornata – or unidentified comparable form
 * † Anomia malinchae
 * † Anomia peruviana
 * † Anomia simplex
 * † Anomia sp. – tentative report
 * † Anomia sp.
 * † Anomia vaquerosensis
 * † Anona
 * † Anona saraviana – type locality for species
 * † Anser
 * † Anser sp.
 * † Antalis
 * † Antalis mississippiense – tentative report
 * † Antalis mississippiense
 * † Antalis mississippiensis – tentative report
 * † Antecalomys
 * † Antecalomys valensis
 * † Anthonomus
 * † Anthonomus dilatofemurus – type locality for species
 * † Antiguastrea
 * † Antiguastrea cellulosa
 * † Antiguastrea sp.
 * † Antillia
 * † Antillia clarki
 * † Antillia heueri – type locality for species
 * † Antillocyathus
 * † Antillocyathus maoensis
 * † Antillocyathus trinitatis
 * † Antillophos
 * † Antillophos elegans
 * † Antillophos mexicanus
 * † Antillopsyche
 * † Antillopsyche mexicana – type locality for species
 * † Antilloseris
 * † Antilloseris cantabrigiensis
 * † Antilocapra
 * † Antilocapra americana
 * † Antropora
 * † Antropora tincta
 * † Antrozous
 * † Antrozous pallidus
 * † Aphaenogaster
 * † Aphaenogaster praerelicta – type locality for species
 * † Apocynophyllum
 * † Apocynophyllum mexicanum – type locality for species
 * † Aquila
 * † Aquila chrysaetos
 * † Araneus
 * † Araneus exustus – type locality for species
 * † Arca – tentative report
 * † Arca
 * † Arca devincta – or unidentified related form
 * † Arca medioimpressa – or unidentified comparable form
 * † Arca mutabilis
 * † Arca osmonti – or unidentified comparable form
 * † Arca pacifica
 * † Arca sp.
 * † Arca spencer
 * † Archaeolithothamnium – tentative report
 * † Archaeolithothamnium
 * † Archaeolithothamnium sp.
 * † Archaeotetra
 * † Archaeotetra inornata
 * † Archipsocopsis
 * † Archipsocopsis antigua – type locality for species
 * † Archipsocopsis antigua
 * † Archipsocus
 * † Archipsocus sp.
 * † Archipsocus sp. 1informal
 * † Archipsocus sp. 2informal
 * † Archipsocus sp. 3informal
 * † Architectonica
 * † Architectonica alabamensis
 * † Architectonica alveatum
 * † Architectonica bajaensis
 * † Architectonica bieleri
 * † Architectonica cognata
 * † Architectonica josephi
 * † Architectonica nobilis
 * † Architectonica sp.
 * † Architectonica sp. 1informal
 * † Architectonica sp. 2informal
 * † Arcinella
 * † Arcinella arcinella
 * † Arcinella sp.
 * † Arcopsis
 * † Arcopsis solida
 * † Arctocephalus
 * † Arctocephalus sp.
 * † Arctodus
 * † Arctodus pristinus
 * † Arctodus sp.
 * † Ardea
 * † Ardea alba
 * † Ardea herodias
 * † Arene
 * † Arene mcleani
 * † Argilloecia
 * † Argilloecia hiwanneensis
 * † Argopecten – tentative report
 * † Argopecten
 * † Argopecten abietis – or unidentified comparable form
 * † Argopecten abietis
 * † Argopecten callidus – or unidentified comparable form
 * † Argopecten callidus
 * † Argopecten cristobalensis – or unidentified comparable form
 * † Argopecten cristobalensis
 * † Argopecten deserti
 * † Argopecten diminutivus – type locality for species
 * † Argopecten diminutivus
 * † Argopecten evermanni – type locality for species
 * † Argopecten hakei – or unidentified comparable form
 * † Argopecten hakei
 * † Argopecten invalidus
 * † Argopecten mendenhalli – or unidentified related form
 * † Argopecten mendenhalli
 * † Argopecten percarus
 * † Argopecten purpuratus – or unidentified comparable form
 * † Argopecten revellei
 * † Argopecten sp.
 * † Argopecten subdolus
 * † Argopecten sverdrupi
 * † Argopecten thetidis
 * † Argopecten ventricosus
 * † Arossia
 * † Arossia panamensis
 * † Artibeus
 * † Artibeus jamaicensis
 * † Assiminea
 * † Assiminea transluscens
 * † Astarte
 * † Astarte opulentora
 * † Asterosmilia
 * † Asterosmilia hilli
 * † Astraea
 * † Astraea undosa
 * † Astraea unguis
 * † Astrangia
 * † Astrangia conferta
 * † Astrangia haimei
 * † Astrangia sp.
 * † Astreopora
 * † Astreopora esperanzae – type locality for species
 * † Astreopora esperanzae
 * † Astreopora spinulosum – type locality for species
 * † Astrocoenia
 * † Astrocoenia dilloni
 * † Astrocoenia guantanamensis
 * † Astrocoenia portoricensis
 * † Astrodapsis
 * † Astrodapsis israelskyi – type locality for species
 * † Astrodapsis kewi – type locality for species
 * † Astrohippus – tentative report
 * † Astrohippus
 * † Astrohippus ansae
 * † Astrohippus stockii – or unidentified comparable form
 * † Astrohippus stockii
 * † Athleta
 * † Athleta clayi – tentative report
 * † Athleta corvocada
 * † Athleta crassitesta
 * † Athleta lapparoides
 * † Athleta minutus
 * † Athleta petrosa
 * † Athleta sp.informal
 * † Athleta symmetrica – tentative report
 * † Athleta symmetrica
 * † Athleta tuomeyi – tentative report
 * † Athleta tuomeyi
 * † Atrina
 * † Atrina jacksoniana – tentative report
 * † Atrina serrata
 * † Atrina sp.
 * † Attiliosa
 * † Attiliosa striata
 * † Aturia
 * † Aturia alabamensis
 * † Aturia angustata
 * † Aturia myrlae
 * † Aturia sp.
 * † Atys
 * † Atys sp.
 * † Aurinia
 * † Aurinia dubia
 * † Avicula
 * † Avicula sp.
 * † Aythya
 * † Aythya affinis
 * † Aythya americana
 * † Aythya marila
 * † Aythya sp.
 * † Azteca
 * † Azteca sp.
 * † Baiomys
 * † Baiomys kolbi
 * † Balaenoptera
 * † Balaenoptera sp.
 * † Balanophyllia
 * † Balanophyllia caulifera – type locality for species
 * † Balantiopteryx
 * † Balantiopteryx io
 * † Balanus
 * † Balanus amphitite – or unidentified comparable form
 * † Balanus californicus – or unidentified related form
 * † Balanus eburneus
 * † Balanus gregarius
 * † Balanus improvisus
 * † Balanus nubilus – or unidentified comparable form
 * † Balanus sp.
 * † Balanus trigonus
 * † Balcis
 * † Balcis conoidea
 * † Balcis rutila
 * † Balcis thersites
 * † Barbatia
 * † Barbatia illota
 * † Barbatia ludoviciana – or unidentified comparable form
 * † Barbatia mauryae
 * † Barbatia reeveana
 * † Barbatia sp.
 * † Barleeia
 * † Barleeia haliotiphila
 * † Barleeia oldroydi
 * † Barleeia subtenuis
 * † Bassariscus
 * † Bassariscus astutus
 * † Bassariscus sp.
 * † Batequeus – type locality for genus
 * † Batequeus
 * † Batequeus mezquitalensis – type locality for species
 * † Batequeus mezquitalensis
 * † Bathygenys
 * † Bathygenys alpha
 * † Belaphotroctes
 * † Belaphotroctes ghesquierei – type locality for species
 * † Belaphotroctes sp.
 * † Benoibates
 * † Benoibates chiapasensis – type locality for species
 * † Bensonomys
 * † Bensonomys baskini
 * † Bensonomys elachys
 * † Bensonomys winklerorum – type locality for species
 * † Bernaya
 * † Bernaya grovesi – type locality for species
 * † Bernaya media
 * † Bernaya obesa
 * † Biddulphia
 * † Biddulphia aurita
 * † Bignonoides – type locality for genus
 * † Bignonoides orbicularis – type locality for species
 * † Bison
 * † Bison alaskensis
 * † Bison latifrons – or unidentified comparable form
 * † Bison latifrons
 * † Bison sp.
 * † Bittium
 * † Bittium alternatum
 * † Bittium estellense
 * † Bittium interfossa
 * † Bittium purpureum
 * † Bittium sp.
 * † Blancocamelus
 * † Blancocamelus meadei
 * † Boletina
 * † Boletina sp. 1informal
 * † Boletina sp. 2informal
 * † Bolis
 * † Bolis mexicana
 * † Borophagus – tentative report
 * † Borophagus
 * † Borophagus diversidens
 * † Borophagus hilli
 * † Borophagus secundus
 * † Borophagus sp.
 * † Borsonia
 * † Borsonia aguilae
 * † Brachidontes
 * † Brachidontes adamsianus
 * † Brachidontes mississippiensis
 * † Brachidontes semilaevis
 * † Brachycythere
 * † Brachycythere sp.
 * † Brachydeutera
 * † Brachydeutera sp.
 * † Brachypogon
 * † Brachypogon sp.
 * † Bradysia
 * † Bradysia sp.
 * † Branta
 * † Branta canadensis
 * † Bremia
 * † Bremia sp.
 * † Brontops
 * † Brontops brachycephalus – or unidentified comparable form
 * † Brunettia
 * † Brunettia hurdi – type locality for species
 * † Bufo
 * † Bufo campi – type locality for species
 * † Bufo sp.
 * † Buisnictis
 * † Buisnictis metabatos – type locality for species
 * † Bulla
 * † Bulla aspersa
 * † Bulla gouldiana – or unidentified comparable form
 * † Bulla gouldiana
 * † Bulla punctulata
 * † Buntonia
 * † Buntonia sp.
 * † Bursa
 * † Bursa corrguata
 * † Bursa corrugata
 * † Bursa rugosa
 * † Buteo – tentative report
 * † Buteo sp.
 * † Byrsochernes – type locality for genus
 * † Byrsochernes maatiatus – type locality for species
 * † Cadulus
 * † Cadulus aldrichi
 * † Cadulus jacksonensis – tentative report
 * † Cadulus sp.
 * † Caecum
 * † Caecum anellifer
 * † Caecum californicum
 * † Caecum chipolanum
 * † Caecum cycloferum
 * † Caecum licalum
 * † Caecum mexicanum
 * † Caecum regulare
 * † Caecum sp.
 * † Caecum tomaculum
 * † Caecum veracruzanum
 * † Caelopleurus
 * † Caelopleurus coronaformis
 * † Caenolambda
 * † Caenolambda jepseni
 * † Calamus
 * † Calamus sp.
 * † Calappa
 * † Calappa flammea
 * † Calappa zurcheri
 * † Calappilia
 * † Calappilia hondoensis
 * † Calcaritermes
 * † Calcaritermes sp.
 * † Calcaritermes vetus – type locality for species
 * † Calcaritermes vetus
 * † Caleschara
 * † Caleschara mexicana
 * † Calidris
 * † Calidris fusicollis
 * † Californiconus
 * † Californiconus californicus
 * † Calippus
 * † Calippus hondurensis
 * † Calippus sp.
 * † Calisiopsis
 * † Calisiopsis azteca – type locality for species
 * † Callianassa
 * † Callianassa pellucida
 * † Callianassa pustulata
 * † Callianassa sp.
 * † Callianassa tepetatensis
 * † Calliostoma
 * † Calliostoma doliarium
 * † Calliostoma eximum
 * † Calliostoma gemmulatum
 * † Calliostoma granulata
 * † Calliostoma hannibali – type locality for species
 * † Calliostoma hannibali
 * † Calliostoma kerri
 * † Calliostoma ligatum
 * † Calliostoma limonensis
 * † Calliostoma limulum
 * † Calliostoma pulcher
 * † Calliostoma sp.
 * † Calliostoma sp. 1informal
 * † Calliostoma sp. 2informal
 * † Callistochiton
 * † Callistochiton crassicostatus
 * † Callistochiton palmulatus
 * † Calloarca
 * † Calloarca alternata
 * † Calloarca taeniata
 * † Callocardia
 * † Callocardia amichel
 * † Callorhinus
 * † Callorhinus gilmorei
 * † Calophos
 * † Calophos plicatilis
 * † Calyptraea
 * † Calyptraea costellata
 * † Calyptraea excentricus
 * † Calyptraea inornata
 * † Calyptraea mamillaris
 * † Calyptraea mammillaris
 * † Calyptraea sp.
 * † Calyptraphorus
 * † Calyptraphorus carrizensis
 * † Calyptraphorus popenoe – tentative report
 * † Calyptraphorus popenoe
 * † Calyptraphorus terrysmithae
 * † Calyptraphorus velatus
 * † Camelops – type locality for genus
 * † Camelops – or unidentified comparable form
 * † Camelops
 * † Camelops hesternus – or unidentified comparable form
 * † Camelops hesternus
 * † Camelops sp. – type locality for species
 * † Camelops sp.
 * † Campanile
 * † Campanile sp.
 * † Camponotus
 * † Camponotus sp.
 * † Cancellaria
 * † Cancellaria bajaensis
 * † Cancellaria centrota
 * † Cancellaria modesta – or unidentified comparable form
 * † Cancellaria paleocenica
 * † Cancellaria sp.
 * † Cancellaria sp. 1informal
 * † Cancellaria sp. 2informal
 * † Cancellaria tritonidea
 * † Cancer
 * † Cancer productus
 * † Candona
 * † Candona caudate
 * † Caniformes
 * † Caniformes sp.
 * † Canis
 * † Canis cedazoensis – type locality for species
 * † Canis dirus
 * † Canis edwardii
 * † Canis ferox – type locality for species
 * † Canis ferox – or unidentified comparable form
 * † Canis ferox
 * † Canis latrans
 * † Canis lepophagus
 * † Canis sp.
 * † Cannopilus
 * † Cannopilus hemisphaericus
 * † Cannopilus sphaericus
 * † Cantharus
 * † Cantharus gemmatus
 * † Cantharus sanguinolentus
 * † Capromeryx – or unidentified comparable form
 * † Capromeryx
 * † Capromeryx minor – or unidentified comparable form
 * † Capromeryx minor
 * † Capromeryx sp.
 * † Capromeryx tauntonensis
 * † Caracara
 * † Caracara cheriway
 * † Caranx – or unidentified comparable form
 * † Caranx sp.
 * † Carcaradon
 * † Carcaradon sulcidens
 * † Carcharadon
 * † Carcharadon sulcidens
 * † Carcharhinus – tentative report
 * † Carcharhinus
 * † Carcharhinus albimarginatus
 * † Carcharhinus altimus
 * † Carcharhinus antiquus
 * † Carcharhinus brachylurus
 * † Carcharhinus brachyurus
 * † Carcharhinus falciformis
 * † Carcharhinus galapagensis
 * † Carcharhinus leucas
 * † Carcharhinus limbatus
 * † Carcharhinus obscurus
 * † Carcharhinus sp.
 * † Carcharhinus velox
 * † Carcharias
 * † Carcharias sp.
 * † Carcharinus
 * † Carcharinus leucas
 * † Carcharodon
 * † Carcharodon arnoldi
 * † Carcharodon auriculatus
 * † Carcharodon carcharias – or unidentified comparable form
 * † Carcharodon carcharias
 * † Carcharodon hastalis
 * † Carcharodon sp.
 * † Carcharodon sulcidens
 * † Carcinoplax – tentative report
 * † Carcinoplax sp.
 * † Cardiomya
 * † Cardiomya vieja
 * † Carditamera
 * † Carditamera affinis
 * † Cardites
 * † Cardites crassicostata
 * † Cardium
 * † Cardium sp.
 * † Carinodrillia
 * † Carinodrillia pylonia – or unidentified comparable form
 * † Caryocorbula
 * † Caryocorbula biradiata
 * † Caryocorbula conradi – tentative report
 * † Caryocorbula conradi
 * † Caryocorbula engonatoides
 * † Caryocorbula marmorata
 * † Caryocorbula nasuta
 * † Caryocorbula prenasuta
 * † Caryocorbula quirosana – or unidentified comparable form
 * † Cassis
 * † Cassis abbreviatus – or unidentified comparable form
 * † Castor
 * † Castor californicus – or unidentified comparable form
 * † Catagonus
 * † Catagonus sp.
 * † Caulophilus
 * † Caulophilus ayotzinapa – type locality for species
 * † Cavilinga
 * † Cavilinga lampra
 * † Cavilinga prolongata
 * † Cedrela
 * † Cedrela miocenica – type locality for species
 * † Cedusa
 * † Cedusa baylissae – type locality for species
 * † Cellana
 * † Cellana sp.
 * † Celleporaria
 * † Celleporaria sp.
 * † Celliforma
 * † Celliforma curvata
 * † Celtis
 * † Celtis sp.
 * † Cenanges – tentative report
 * † Cenanges sp. 1informal
 * † Cenanges sp. 2informal
 * † Cenocephalus
 * † Cenocephalus hurdi – type locality for species
 * † Cenocephalus hurdi
 * † Cenocephalus quadrilobus – type locality for species
 * † Cenocephalus succinicaptus
 * † Cenocephalus tenuis – type locality for species
 * † Centruroides – tentative report
 * † Centruroides sp.
 * † Cephalotes
 * † Cephalotes maya – type locality for species
 * † Cephalotes olmecus – type locality for species
 * † Cephalotes poinari – type locality for species
 * † Cephalotes sp. 1informal
 * † Cephalotes sp. 2informal
 * † Cephalotes ventriosus – type locality for species
 * † Cerastoderma
 * † Cerastoderma carlotae
 * † Ceratocombus
 * † Ceratocombus hurdi – type locality for species
 * † Ceratostoma
 * † Ceratostoma nuttalli
 * † Ceratostoma pecki – type locality for species
 * † Ceratostoma pecki
 * † Cerdocyon
 * † Cerdocyon avius – tentative report
 * † Cerdocyon avius
 * † Cerithidea
 * † Cerithidea californica
 * † Cerithidea mazatlanica
 * † Cerithidea sp.
 * † Cerithiopsis
 * † Cerithiopsis antefilosa
 * † Cerithiopsis antemunda – or unidentified comparable form
 * † Cerithiopsis carpenteri
 * † Cerithiopsis diegensis
 * † Cerithiopsis sp.
 * † Cerithiopsis vinca
 * † Cerithium – tentative report
 * † Cerithium – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Cerithium
 * † Cerithium alejandroi
 * † Cerithium caloosaense
 * † Cerithium hillsboroense
 * † Cerithium maculosum
 * † Cerithium mendezense
 * † Cerithium revillense
 * † Cerithium sp.
 * † Cerithium stercomuscarum
 * † Cernina
 * † Cernina hannibali
 * † Cerorhinca
 * † Cerorhinca minor – type locality for species
 * † Cerorhinca minor
 * † Cetorhinus
 * † Cetorhinus sp.
 * † Chaetodipus
 * † Chaetodipus hispidus
 * † Chaetodromia
 * † Chaetodromia pulchra – type locality for species
 * † Chagrepecten
 * † Chagrepecten cactaceus
 * † Chagrepecten dallasi
 * † Chama
 * † Chama arcana
 * † Chama frondosa
 * † Chama janus
 * † Chama sp.
 * † Chama squamuligera
 * † Chamelea
 * † Chamelea matulina – tentative report
 * † Chamelea matulina
 * † Chamelea matutina
 * † Chara
 * † Chara sp.
 * † Charonia – tentative report
 * † Charonia sp.
 * † Chasmaporthetes
 * † Chasmaporthetes ossifragus
 * † Cheilea
 * † Cheilea equestris
 * † Chemnitzia
 * † Chemnitzia atlasi
 * † Chemnitzia sp.
 * † Chiapasona – type locality for genus
 * † Chiapasona defuncta – type locality for species
 * † Chicoreus
 * † Chicoreus articulatus
 * † Chicoreus brevifrons
 * † Chicoreus dilectus
 * † Chicoreus enigmaticus
 * † Chicoreus miltos – type locality for species
 * † Chione
 * † Chione californiensis – or unidentified comparable form
 * † Chione californiensis
 * † Chione ebergengyii
 * † Chione elesmerensis
 * † Chione kanakoffi
 * † Chione richtofeni – type locality for species
 * † Chione securis – or unidentified comparable form
 * † Chione sp.
 * † Chione subrugosa – or unidentified comparable form
 * † Chione tumens
 * † Chione undatella – tentative report
 * † Chione undatella
 * † Chioneryx
 * † Chioneryx squamosa
 * † Chionista
 * † Chionista fluctifraga
 * † Chionopsis
 * † Chionopsis gnidia
 * † Chionopsis propinqua – or unidentified comparable form
 * † Chionopsis propinqua
 * † Chionopsis pullcaria
 * † Chionopsis richthofeni
 * † Chionopsis sp.
 * † Chionopsis temblorensis – or unidentified related form
 * † Chionopsis temblorensis
 * † Chlamys
 * † Chlamys burlesonensis – tentative report
 * † Chlamys corteziana
 * † Chlamys hastata
 * † Chlamys mediacostatus
 * † Chlamys opuntia
 * † Chlamys parmeleei
 * † Chlamys swifti
 * † Chlorostoma
 * † Chlorostoma gallina – or unidentified comparable form
 * † Chlorostoma gallina
 * † Chlorostoma rugosa
 * † Chlorostoma sp.
 * † Chonecetus – tentative report
 * † Chonecetus sp.
 * † Chrysodomus
 * † Chrysodomus sp.
 * † Chrysotus
 * † Chrysotus sp.
 * † Cibicides
 * † Cibicides fletcheri
 * † Cimomia
 * † Cimomia haltomi
 * † Cimomia vaughani – or unidentified comparable form
 * † Circus
 * † Circus cyaneus
 * † Cirsotrema – tentative report
 * † Cirsotrema
 * † Cirsotrema cortezi – tentative report
 * † Cirsotrema cortezi
 * † Cirsotrema sp.
 * † Cladocora
 * † Cladocora bosquensis – type locality for species
 * † Cladocora bosquensis
 * † Cladocora sp.
 * † Claibornites
 * † Claibornites diegoensis – or unidentified comparable form
 * † Clathrodrillia
 * † Clathrodrillia incisa
 * † Clavilithes
 * † Clavilithes tabulatus
 * † Clavus
 * † Clavus empyrosia – or unidentified comparable form
 * † Clavus hemphilli
 * † Clavus inaudita
 * † Clavus oerteli
 * † Clavus urbinai
 * † Clementia – tentative report
 * † Clementia
 * † Clementia conradiana – or unidentified comparable form
 * † Clementia dariena
 * † Clementia grayi – tentative report
 * † Clementia grayi – or unidentified comparable form
 * † Clementia sp.
 * † Clinocardium
 * † Clinocardium meekianum – or unidentified related form
 * † Clinodiplosis
 * † Clinodiplosis terrestris – or unidentified related form
 * † Clithon
 * † Clithon luteofasciatus
 * † Clithrocytheridea
 * † Clithrocytheridea caldwellensis
 * † Clithrocytheridea grigsbyi
 * † Clithrocytheridea sp. 1informal
 * † Clithrocytheridea sp. 2informal
 * † Cloeodes
 * † Cloeodes sp.
 * † Clypeasler
 * † Clypeasler carrizoensis – or unidentified comparable form
 * † Clypeaster
 * † Clypeaster bowersi
 * † Clypeaster deserti
 * † Clypeaster sp.
 * † Cnemidophorus
 * † Cnemidophorus gularis
 * † Cochlespira
 * † Cochlespira cedonulli – or unidentified comparable form
 * † Cochlespira miranda
 * † Codakia
 * † Codakia distinguenda – tentative report
 * † Codakia distinguenda
 * † Collonista – tentative report
 * † Collonista sp.
 * † Colpophyllia
 * † Colpophyllia mexicanum – type locality for species
 * † Colpophyllia mexicanum
 * † Colpophyllia natans
 * † Colpophyllia nicholasi – type locality for species
 * † Colpophyllia sp.
 * † Colpophyllia willoughbiensis
 * † Columbella
 * † Columbella aureomexicana
 * † Columbella sp.
 * † Colymbus
 * † Colymbus nigricollis
 * † Comocladia
 * † Comocladia intermedia – type locality for species
 * † Conasprelloides
 * † Conasprelloides multiliratus
 * † Concavus
 * † Concavus concavus – or unidentified comparable form
 * † Concavus concavus
 * † Conchocele
 * † Conchocele bisecta
 * † Conepatus
 * † Conepatus leuconotus
 * † Conepatus sanmiguelensis – type locality for species
 * † Conepatus sanmiguelensis
 * † Connarus
 * † Connarus carmenensis – type locality for species
 * † Conopeum
 * † Conopeum commensale
 * † Constrictor – or unidentified comparable form
 * † Constrictor sp.
 * † Contarinia
 * † Contarinia sp.
 * † Conus
 * † Conus aemulator
 * † Conus agassizi
 * † Conus almagrensis
 * † Conus angosturis – or unidentified comparable form
 * † Conus boggsi – or unidentified comparable form
 * † Conus boggsi
 * † Conus brunneus – or unidentified comparable form
 * † Conus brunneus
 * † Conus burckhardti
 * † Conus cacuminatus
 * † Conus caleocius
 * † Conus consobrinus
 * † Conus fergusoni
 * † Conus gladiator
 * † Conus imitator
 * † Conus jaspideus – or unidentified comparable form
 * † Conus lucidus
 * † Conus mahogani
 * † Conus nux
 * † Conus perplexus
 * † Conus princeps
 * † Conus protractus – tentative report
 * † Conus puncticulatus
 * † Conus purpurascens
 * † Conus recurvus
 * † Conus regularis – tentative report
 * † Conus regularis – or unidentified related form
 * † Conus regularis – or unidentified comparable form
 * † Conus regularis
 * † Conus sauridens
 * † Conus sp.
 * † Conus spurius – or unidentified comparable form
 * † Copallinges – type locality for genus
 * † Copallinges chiapasensis – type locality for species
 * † Copelatus
 * † Copelatus sp.
 * † Coptotermes
 * † Coptotermes sp.
 * † Coptotermes sucineus – type locality for species
 * † Coptotermes sucineus
 * † Coralliophila
 * † Coralliophila miocenica
 * † Corbisema
 * † Corbisema triacantha
 * † Corbula – tentative report
 * † Corbula
 * † Corbula azucar
 * † Corbula carli
 * † Corbula carlotae
 * † Corbula engonata
 * † Corbula heterogena
 * † Corbula laqueata – tentative report
 * † Corbula lavalleana – or unidentified comparable form
 * † Corbula olssoni
 * † Corbula sp.
 * † Corbula texana – tentative report
 * † Cormohipparion
 * † Cormohipparion quinni – or unidentified related form
 * † Cornulina – tentative report
 * † Cornulina
 * † Cornulina armigera
 * † Cornulina lita
 * † Cornulina sp.
 * † Cornwallius – or unidentified related form
 * † Cornwallius
 * † Cornwallius sookensis
 * † Cornwallius sp.
 * † Corystosiren – type locality for genus
 * † Corystosiren varguezi – type locality for species
 * † Coscinaraea
 * † Coscinaraea colei – type locality for species
 * † Coscinodiscus
 * † Coscinodiscus curvatulus
 * † Coscinodiscus excentricus
 * † Coscinodiscus marginatus
 * † Coscinodiscus oculusiridis
 * † Cosoryx – or unidentified comparable form
 * † Cosoryx
 * † Cosoryx sp.
 * † Coussapoa
 * † Coussapoa veracruziana – type locality for species
 * † Crassadoma
 * † Crassadoma gigantea
 * † Crassatella
 * † Crassatella antestriatus
 * † Crassatella branneri – or unidentified related form
 * † Crassatella sp.
 * † Crassatella texanus – tentative report
 * † Crassinella
 * † Crassinella santarosaensis
 * † Crassinella sp.
 * † Crassinella varians – or unidentified comparable form
 * † Crassispira
 * † Crassispira starri – type locality for species
 * † Crassispira starri
 * † Crassitella
 * † Crassitella sp.
 * † Crassostrea
 * † Crassostrea columbiensis
 * † Crassostrea contracta
 * † Crassostrea corteziensis – or unidentified comparable form
 * † Crassostrea titan
 * † Crassostrea virginica
 * † Cratogeomys
 * † Cratogeomys castanops – or unidentified comparable form
 * † Cratogeomys castanops
 * † Cratogeomys merriami
 * † Crematogaster
 * † Crematogaster sp.
 * † Crenella
 * † Crenella diuturna
 * † Crepidula – tentative report
 * † Crepidula
 * † Crepidula adunca
 * † Crepidula arenata – or unidentified comparable form
 * † Crepidula coei
 * † Crepidula lingulata
 * † Crepidula nivea
 * † Crepidula norrisianum
 * † Crepidula nummaria
 * † Crepidula onyx
 * † Crepidula princeps
 * † Crepidula sp.
 * † Crepidula striolata
 * † Crepipatella
 * † Crepipatella lingulata
 * † Crepitacella
 * † Crepitacella cepula
 * † Crescentia
 * † Crescentia cucurbitinoides – type locality for species
 * † Crocodylus – or unidentified comparable form
 * † Crocodylus
 * † Crocodylus acutus
 * † Crocodylus sp.
 * † Crommium
 * † Crommium globosa
 * † Crommium perovatum – or unidentified comparable form
 * † Crossata
 * † Crossata ventricosa
 * † Crotalus – or unidentified comparable form
 * † Crotalus sp.
 * † Crucibulum
 * † Crucibulum chipolanum
 * † Crucibulum imbricatum
 * † Crucibulum scutellatum
 * † Crucibulum sp.
 * † Crucibulum spinosum
 * † Cryptochiton
 * † Cryptochiton stelleri
 * † Cryptomya
 * † Cryptomya californica
 * † Cryptopygus
 * † Cryptopygus sp.
 * † Cryptorama
 * † Cryptorama sp.
 * † Cryptorhopalum
 * † Cryptorhopalum electron – type locality for species
 * † Cryptorhynchus – or unidentified related form
 * † Cryptorhynchus
 * † Cryptorhynchus sp. 1informal
 * † Cryptorhynchus sp. 2informal
 * † Cryptotis
 * † Cryptotis parva
 * † Ctena
 * † Ctena mexicana
 * † Ctenocardia
 * † Ctenocardia biangulata
 * † Ctenocheles
 * † Ctenocheles sp.
 * † Cubitostrea
 * † Cubitostrea lisbonensis
 * † Cubitostrea mezquitalensis – type locality for species
 * † Cubitostrea mezquitalensis
 * † Cubitostrea rugifera
 * † Cubitostrea sellaeformis
 * † Cucullaea
 * † Cucullaea mathewsoni
 * † Cucullaea mathewsonii
 * † Culicoides
 * † Culicoides sp.
 * † Culiseta
 * † Culiseta sp.
 * † Culoptila
 * † Culoptila aguilerai – type locality for species
 * † Cumingia
 * † Cumingia californica
 * † Cuon
 * † Cuon alpinus
 * † Cushmanidea
 * † Cushmanidea ashermani
 * † Cuvieronius
 * † Cuvieronius sp.
 * † Cuvieronius tropicus – type locality for species
 * † Cuvieronius tropicus
 * † Cyathoseris
 * † Cyathoseris allisoni – type locality for species
 * † Cyclichna
 * † Cyclichna sp.
 * † Cyclinella – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Cyclinella
 * † Cyclinella beteyensis – or unidentified comparable form
 * † Cyclinella cyclica
 * † Cyclocardia
 * † Cyclocardia californica – or unidentified comparable form
 * † Cyclocardia ventricosa
 * † Cyclostremiscus
 * † Cyclostremiscus bartschi
 * † Cyclostremiscus domingensis
 * † Cyclostremiscus guppyi
 * † Cyclostremiscus pentagonus
 * † Cyclostremiscus petiti
 * † Cylichna
 * † Cylichna sp.
 * † Cymatosyrinx
 * † Cymatosyrinx hemphilli
 * † Cymia
 * † Cymia heimi – type locality for species
 * † Cymia heimi
 * † Cymia michoacanensis
 * † Cymia sp.
 * † Cynomys
 * † Cynomys sp.
 * † Cyphomyrmex
 * † Cyphomyrmex maya – type locality for species
 * † Cypraea
 * † Cypraea sp.
 * † Cypraecassis
 * † Cypraecassis coarctata
 * † Cypraecassis wilmae
 * † Cypraedia
 * † Cypraedia girauxi – or unidentified comparable form
 * † Cypraeolina
 * † Cypraeolina pyriformis
 * † Cypraeorbis
 * † Cypraeorbis alabamensis
 * † Cypraeorbis sp.
 * † Cypridopsis
 * † Cypridopsis vidua
 * † Cystiscus
 * † Cystiscus jewetti
 * † Cystiscus regularis
 * † Cystiscus subtrigona
 * † Cythara
 * † Cythara interlirata
 * † Cytherea
 * † Cytherea hornii – or unidentified related form
 * † Cythereis – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Cythereis hysonensis
 * † Cytherella
 * † Cytherella hannai
 * † Cytherelloidea
 * † Cytherelloidea danvillensis – or unidentified related form
 * † Cytherelloidea sp.
 * † Cytheretta
 * † Cytheretta sp.
 * † Cytheromorpha
 * † Cytheromorpha sp.
 * † Cytheropteron
 * † Cytheropteron mexicanum – type locality for species
 * † Cytheropteron mexicanum
 * † Cytheropteron sp.
 * † Cytherura
 * † Cytherura sp.
 * † Daldorfia
 * † Daldorfia salina
 * † Dalium
 * † Dalium dalli
 * † Dallium
 * † Dallium dalli
 * † Dallocardia
 * † Dallocardia quadragenarium – or unidentified comparable form
 * † Dallocardia quadragenarium
 * † Dardanus
 * † Dardanus mexicanus – or unidentified comparable form
 * † Dardanus mexicanus
 * † Darwinula
 * † Darwinula sp.
 * † Dasyatis
 * † Dasyatis sp.
 * † Dasyatus
 * † Dasyatus sp.
 * † Dasyhelea
 * † Dasyhelea sp.
 * † Delphinodon
 * † Delphinodon sp.
 * † Dendostrea
 * † Dendostrea angermanni – type locality for species
 * † Dendostrea vespertina – or unidentified comparable form
 * † Dendostrea vespertina
 * † Dendraster
 * † Dendraster cedrosensis
 * † Dendraster diegoensis
 * † Dendraster excentricus
 * † Dendraster gibbsii – or unidentified related form
 * † Dendraster gibbsii
 * † Dendraster hesperis – or unidentified comparable form
 * † Dendraster pacificus
 * † Dendraster pentagonalis
 * † Dendrogyra
 * † Dendrogyra cylindrus
 * † Dendropoma
 * † Dendropoma lituella
 * † Denebola – type locality for genus
 * † Denebola brachycephala – type locality for species
 * † Dentalium
 * † Dentalium alazanum
 * † Dentalium cooperi
 * † Dentalium cooperii
 * † Dentalium neohexagonum
 * † Dentalium ovale
 * † Dentalium praecursor
 * † Dentalium rimosum
 * † Dentalium sp.
 * † Dentalium stentor
 * † Desmathyus
 * † Desmathyus brachydontus
 * † Desmostylus – or unidentified related form
 * † Desmostylus
 * † Desmostylus hesperus
 * † Desmostylus sp.
 * † Diacodexis
 * † Diacodexis gracilis – or unidentified comparable form
 * † Diacrita
 * † Diacrita sp.
 * † Dibelodon
 * † Dibelodon praecursor – or unidentified comparable form
 * † Dibelodon praecursor
 * † Dibelodon shepardi
 * † Dichocoenia
 * † Dichocoenia stokesi
 * † Dicranomyia
 * † Dicranomyia alexbrowni – type locality for species
 * † Dicranomyia chiapa – type locality for species
 * † Dicranomyia mexa – type locality for species
 * † Dicranomyia sp.informal
 * † Dicranomyia sp.
 * † Dicranomyia vella – type locality for species
 * † Dicromantispa
 * † Dicromantispa electromexicana – type locality for species
 * † Dictyocha
 * † Dictyocha fibula
 * † Didelphis
 * † Didelphis marsupialis
 * † Didianema – tentative report
 * † Didianema sp.
 * † Dinocardium
 * † Dinocardium bakeri
 * † Dinocardium cabezai – tentative report
 * † Dinocardium cabezai
 * † Dinohippus – tentative report
 * † Dinohippus
 * † Dinohippus interpolatus
 * † Dinohippus mexicanus – type locality for species
 * † Dinohippus mexicanus
 * † Dinohippus sp.
 * † Dioclea – tentative report
 * † Dioclea mexicana – type locality for species
 * † Diodons
 * † Diodons sp.
 * † Diodora
 * † Diodora aspera
 * † Diodora cayenensis – or unidentified comparable form
 * † Diodora inaequalis
 * † Diomedea
 * † Diomedea sp.
 * † Dioplotherium
 * † Dioplotherium allisoni
 * † Dioplotherium sp.
 * † Diploastrea
 * † Diploastrea crassolamellata
 * † Diploastrea sp.
 * † Diplochaetetes
 * † Diplochaetetes mexicanus
 * † Diplodonta
 * † Diplodonta orbella
 * † Diplodonta sericata
 * † Diplodonta sp.
 * † Diploneis
 * † Diploneis taschenbergeri
 * † Diploria
 * † Diploria dumblei – type locality for species
 * † Diploria labyrinthiformis
 * † Dipodomys
 * † Dipodomys sp.
 * † Discothyrea
 * † Discothyrea maya – type locality for species
 * † Dissacus
 * † Dissacus sp.
 * † Distephanus
 * † Distephanus crux
 * † Distephanus speculum
 * † Distorsio
 * † Distorsio clathrata
 * † Distorsio constricta
 * † Distorsio decussata
 * † Distorsio mcgintyi
 * † Distorsio sp.
 * † Divalinga – tentative report
 * † Divalinga
 * † Divalinga eburnea
 * † Divalinga quadrisulcata
 * † Divalinga sp.
 * † Divisulcus – type locality for genus
 * † Divisulcus demerei – type locality for species
 * † Dolichorhinotermes
 * † Dolichorhinotermes apopnus – type locality for species
 * † Donax
 * † Donax gouldii
 * † Donax gracilis
 * † Donax navicula
 * † Donax sp.
 * † Dosinia
 * † Dosinia acetabulum
 * † Dosinia dunkeri – or unidentified comparable form
 * † Dosinia dunkeri
 * † Dosinia ponderosa
 * † Dosinia sp.
 * † Dosinidia
 * † Dosinidia elegans
 * † Drapetis
 * † Drapetis dissentis – type locality for species
 * † Drepanura
 * † Drepanura sp.
 * † Dryinus
 * † Dryinus palaeomexicanus – type locality for species
 * † Drypetes
 * † Drypetes elliptica – type locality for species
 * † Dusignathus
 * † Dusignathus santacruzensis
 * † Dusisiren
 * † Dusisiren reinharti – type locality for species
 * † Dyocibicides
 * † Dyocibicides biserialis
 * † Ebriopsis
 * † Ebriopsis antiqua
 * † Echinocythereis
 * † Echinocythereis mcguirti
 * † Echinolampas
 * † Echinolampas sp. – tentative report
 * † Echinometra
 * † Echinometra sp.
 * † Ecphylus
 * † Ecphylus oculatus – type locality for species
 * † Ectocion
 * † Ectocion ignotum – type locality for species
 * † Ectopsocus
 * † Ectopsocus sp.
 * † Elasmostoma
 * † Elasmostoma bajaensis – type locality for species
 * † Elasmostoma bajaensis
 * † Electribius
 * † Electribius palaeomexicanus – type locality for species
 * † Electrophrynus – type locality for genus
 * † Electrophrynus mirus – type locality for species
 * † Elektrothopomyia
 * † Elektrothopomyia saltensis – type locality for species
 * † Elektrothopomyia tzoltzili – type locality for species
 * † Elimia
 * † Elimia trigemmata – or unidentified comparable form
 * † Elphidium
 * † Elphidium nassauensis
 * † Empicoris
 * † Empicoris electricus – type locality for species
 * † Encope
 * † Encope arcensis – type locality for species
 * † Encope arcensis
 * † Encope californica
 * † Encope chaneyi – type locality for species
 * † Encope granids
 * † Encope loretoensis – type locality for species
 * † Encope loretoensis
 * † Encope scrippsae – tentative report
 * † Encope sp.
 * † Encope sverdrupe
 * † Encope sverdrupi
 * † Encope tatetlaensis
 * † Encope tenuis – or unidentified related form
 * † Encope tenuis
 * † Enoploclytia
 * † Enoploclytia sp.
 * † Entomobrya
 * † Entomobrya decora – tentative report
 * † Entomobrya litigiosa – tentative report
 * † Entomobrya sp.
 * † Entomobrya trifasciata – tentative report
 * † Eocithara
 * † Eocithara sp.
 * † Eocypraea
 * † Eocypraea castacensis – or unidentified comparable form
 * † Eocypraea inflata
 * † Eocypraea novasumma
 * † Eocypraea sp. – tentative report
 * † Eocypraea sp.
 * † Eofabiania
 * † Eofabiania cushamani
 * † Eohippus
 * † Eohippus angustidens – or unidentified comparable form
 * † Eohomopterus
 * † Eohomopterus simojovelensis – type locality for species
 * † Eomysmena
 * † Eomysmena asta – type locality for species
 * † Eopapyrina
 * † Eopapyrina darienensis
 * † Eopustularia
 * † Eopustularia acyensis
 * † Eopustularia subrostrata
 * † Epicauta
 * † Epicauta sanctoruensis – type locality for species
 * † Epicyon
 * † Epicyon saevus
 * † Epilucina
 * † Epilucina californica
 * † Episinus
 * † Episinus chiapasanus – type locality for species
 * † Episinus penneyi – type locality for species
 * † Epitonium
 * † Epitonium cedrosensis – type locality for species
 * † Epitonium cedrosensis
 * † Epitonium contrerasi – type locality for species
 * † Epitonium dallasi – type locality for species
 * † Epitonium dupliniana
 * † Epitonium foliaceicostum
 * † Epitonium indianorum
 * † Epitonium sp. – type locality for species
 * † Epitonium sp.
 * † Epitonium tinctum
 * † Equus
 * † Equus complicatus – or unidentified related form
 * † Equus conversidens – type locality for species
 * † Equus conversidens – or unidentified comparable form
 * † Equus conversidens
 * † Equus crenidens – type locality for species
 * † Equus crenidens
 * † Equus excelsus
 * † Equus mexicanus
 * † Equus simplicidens – tentative report
 * † Equus simplicidens – or unidentified comparable form
 * † Equus simplicidens
 * † Equus sp.
 * † Erato
 * † Erato sp.
 * † Erethizon
 * † Erethizon dorsatum – tentative report
 * † Erethizon dorsatum
 * † Erioptera
 * † Erioptera beata – type locality for species
 * † Erioptera divera – type locality for species
 * † Erioptera sherry – type locality for species
 * † Eriosachila
 * † Eriosachila bajaensis – type locality for species
 * † Eriosachila bajaensis
 * † Eriosachila bajensis
 * † Eriosachila sp.
 * † Eriphia
 * † Eriphia squamata
 * † Erosaria
 * † Erosaria aliena – or unidentified comparable form
 * † Erosaria cernica
 * † Esteslestes
 * † Esteslestes ensis – type locality for species
 * † Esthonyx – or unidentified comparable form
 * † Esthonyx sp.
 * † Eucanyra
 * † Eucanyra sp.
 * † Euceratherium
 * † Euceratherium sp.
 * † Eucidaris
 * † Eucidaris thouarsi
 * † Euclia
 * † Euclia cassidiformis
 * † Eucrassatella
 * † Eucrassatella venezuelana – or unidentified comparable form
 * † Eucyon
 * † Eucyon davisi
 * † Eugnamptus
 * † Eugnamptus proterus – type locality for species
 * † Eulaema
 * † Eulaema zigrasi – type locality for species
 * † Eumetopias
 * † Eumetopias sp.
 * † Eumops
 * † Eumops perotis
 * † Euparius
 * † Euparius elongatus – type locality for species
 * † Eupatagus
 * † Eupatagus batequensis – type locality for species
 * † Euperlida – type locality for genus
 * † Euperlida parvicercifera – type locality for species
 * † Euphagus
 * † Euphagus cyanocephalus
 * † Eupleura
 * † Eupleura engerrabunda
 * † Eupleura triquetra
 * † Eurytellina
 * † Eurytellina browni
 * † Eurytellina mooreana – tentative report
 * † Eurytellina mooreana
 * † Eurytellina simulans
 * † Eurytium
 * † Eurytium sp.
 * † Eusmilia
 * † Eusmilia fastigiata
 * † Euspatangus
 * † Euspatangus antillarium
 * † Euspira
 * † Euspira heros
 * † Euspira hotsoni – or unidentified comparable form
 * † Euspira lewisii
 * † Euthynnus
 * † Euthynnus sp.
 * † Euvola
 * † Euvola bowdenensis
 * † Euvola keepi – or unidentified related form
 * † Euvola keepi
 * † Euvola vogdesi – or unidentified comparable form
 * † Euvola vogdesi
 * † Exilia
 * † Exilia sp.
 * † Fabiania
 * † Fabiania cubensis
 * † Fagara
 * † Fagara wadii – type locality for species
 * † Falsifusus
 * † Falsifusus carexus
 * † Falsifusus mortoniopsis
 * † Fartulum
 * † Fartulum hemphilli
 * † Fartulum occidentale
 * † Fartulum orcutti
 * † Fasciolaria
 * † Fasciolaria semistriata
 * † Favartia
 * † Favartia lappa – or unidentified comparable form
 * † Favia
 * † Favia dominicensis
 * † Favia fragum
 * † Favites
 * † Favites mexicana – type locality for species
 * † Favites polygonalis
 * † Felis
 * † Felis lacustris
 * † Fictotama – type locality for genus
 * † Fictotama extincta – type locality for species
 * † Fictovichnus
 * † Fictovichnus sciuttoi
 * † Ficus
 * † Ficus carbasea
 * † Ficus communis
 * † Ficus mississippiensis
 * † Ficus sp.
 * † Ficus talamancana – type locality for species
 * † Ficus ventricosa
 * † Ficus ventricosus – or unidentified comparable form
 * † Fimbria
 * † Fimbria pacifica – type locality for species
 * † Fissurella
 * † Fissurella mexicana
 * † Fissurella sp.
 * † Fissurella volcano
 * † Flabellipecten
 * † Flabellipecten carrizoensis
 * † Flabellipecten refugioensis
 * † Flabellipecten stearnsii
 * † Flabellum
 * † Flabellum sp.
 * † Floresomys
 * † Floresomys guanajuatoensis – type locality for species
 * † Forcipomyia
 * † Forcipomyia sp.informal
 * † Forcipomyia sp.
 * † Forelius
 * † Forelius sp.
 * † Forreria
 * † Forreria belcheri
 * † Forreria sp.
 * † Forreria wrighti – type locality for species
 * † Fulica
 * † Fulica americana – or unidentified comparable form
 * † Fulica americana
 * † Fusimitra
 * † Fusimitra conquisita
 * † Fusimitra conquista
 * † Fusimitra millingtoni
 * † Fusinus
 * † Fusinus cinereus
 * † Fusinus luteopictus
 * † Fusinus sp.
 * † Gadila
 * † Gadila aldrichi – tentative report
 * † Gadila aldrichi
 * † Galeocerdo
 * † Galeocerdo aduncus
 * † Galeocerdo rosaliaensis
 * † Galeocerdo rosaliensis
 * † Galeocerdo sp.
 * † Galeodea
 * † Galeodea koureos – tentative report
 * † Galeodea koureos
 * † Galeodea planotecta – tentative report
 * † Galeodea sp.
 * † Galeorhinus – or unidentified comparable form
 * † Galeorhinus sp.
 * † Galodea
 * † Galodea sp.
 * † Gardineria
 * † Gardineria simojovelensis – type locality for species
 * † Gardineroseris
 * † Gardineroseris planulata
 * † Gari
 * † Gari hornii – or unidentified comparable form
 * † Gavelinopsis
 * † Gavelinopsis turbinata
 * † Gemmula
 * † Gemmula alazana
 * † Gemmula mexa
 * † Geochelone
 * † Geochelone sp.
 * † Geomys
 * † Geomys carranzai
 * † Geomys minor
 * † Geratozygops
 * † Geratozygops durhami – type locality for species
 * † Gibberula
 * † Gibberula glandula
 * † Ginglymostoma
 * † Ginglymostoma sp.
 * † Glans
 * † Glans carpenteri
 * † Globigerinoides
 * † Globigerinoides sacculifer
 * † Globocuadrina
 * † Globocuadrina altispira
 * † Globocuadrina globosa
 * † Globoquadrina
 * † Globoquadrina venezuelana – tentative report
 * † Globorotalia
 * † Globorotalia obesa
 * † Glossotherium – or unidentified comparable form
 * † Glossotherium
 * † Glossotherium garbanii
 * † Glossotherium sp.
 * † Glycymeris
 * † Glycymeris gigantea
 * † Glycymeris inaequalis
 * † Glycymeris maculata – or unidentified comparable form
 * † Glycymeris sagittata
 * † Glycymeris septentrionalis – tentative report
 * † Glycymeris septentrionalis – or unidentified related form
 * † Glycymeris septentrionalis
 * † Glycymeris sp.
 * † Glycymeris swartsi – type locality for species
 * † Glycymeris swartsi
 * † Glycymeris veatchii – or unidentified related form
 * † Glycymeris veatchii
 * † Glyphonyx
 * † Glyphonyx chiapasensis – type locality for species
 * † Glyphonyx punctatus – type locality for species
 * † Glyphonyx sp.
 * † Glyphostoma
 * † Glyphostoma andersoni – or unidentified comparable form
 * † Glyphostoma gabbi
 * † Glyphoturris
 * † Glyphoturris toulai
 * † Glyptoactis
 * † Glyptoactis domenginica
 * † Glyptodon
 * † Glyptodon sp.
 * † Glyptotherium
 * † Glyptotherium arizonae – tentative report
 * † Glyptotherium cylindricum
 * † Glyptotherium floridanum
 * † Glyptotherium mexicanum – or unidentified comparable form
 * † Glyptotherium mexicanum
 * † Glyptotherium sp.
 * † Glyptotoma
 * † Glyptotoma rhombica
 * † Gnophomyia
 * † Gnophomyia sp.
 * † Goeppertia
 * † Goeppertia tertiaria – or unidentified comparable form
 * † Gomphotherium – tentative report
 * † Gomphotherium – or unidentified comparable form
 * † Gomphotherium
 * † Gomphotherium obscurum
 * † Gomphotherium sp.
 * † Goniastrea
 * † Goniastrea canalis
 * † Goniodiscaster – tentative report
 * † Goniodiscaster sp.
 * † Goniopora
 * † Goniopora copayens
 * † Goniopora hilli
 * † Goniopora imperatoris
 * † Goniopora reussiana
 * † Goniopora sp.
 * † Gopherus – or unidentified comparable form
 * † Gopherus
 * † Gopherus donlaloi – type locality for species
 * † Gopherus sp.
 * † Gordanops
 * † Gordanops baranoanus
 * † Gouania
 * † Gouania miocenica – type locality for species
 * † Gouldia
 * † Gouldia insularis
 * † Granolaria
 * † Granolaria salmo
 * † Granosolarium
 * † Granosolarium sp.
 * † Gregorymys
 * † Gregorymys sp.
 * † Guanajuatomys
 * † Guanajuatomys hibbardi
 * † Guettarda
 * † Guettarda cookei
 * † Gymnogramme
 * † Gymnogramme wadii – type locality for species
 * † Gymnura
 * † Gymnura sp.
 * † Gyrineum
 * † Gyrineum sp.
 * † Gyrodes
 * † Gyrodes canrenoides
 * † Gyrodes robustus – or unidentified comparable form
 * † Gyrodes sp. – tentative report
 * † Gyroidinoides
 * † Gyroidinoides sp.
 * † Hadrianus – or unidentified related form
 * † Hadrianus sp.
 * † Haimea
 * † Haimea bajasurensis
 * † Haimesiastraea
 * † Haimesiastraea conferta
 * † Haimesiastraea peruviana
 * † Haliotis
 * † Haliotis cracherodi
 * † Haliotis fulgens
 * † Haliotis rufescens – or unidentified comparable form
 * † Haliotis rufescens
 * † Haliotis sp.
 * † Halistylus
 * † Halistylus pupoideus
 * † Halonanus
 * † Halonanus pulchrus – tentative report
 * † Hanetia
 * † Hanetia dalli
 * † Hanetia pallida
 * † Haplocytheridea
 * † Haplocytheridea blanpiedi
 * † Haplodiplatys
 * † Haplodiplatys crightoni – type locality for species
 * † Haplorhus
 * † Haplorhus medranoensis – type locality for species
 * † Harfordia
 * † Harfordia monksae – or unidentified comparable form
 * † Harpa
 * † Harpa isthmica – type locality for species
 * † Harpa isthmica
 * † Harpactocarcinus
 * † Harpactocarcinus americanus
 * † Harvella
 * † Harvella sincola – or unidentified comparable form
 * † Haydnella
 * † Haydnella steininbergi
 * † Heliacus
 * † Heliacus sp.
 * † Helicostegina
 * † Helicostegina dimorpha
 * † Heliopora
 * † Heliopora mexicanae – type locality for species
 * † Heliopora mexicanae
 * † Heliopora sp. – tentative report
 * † Helisoma
 * † Helisoma sp.
 * † Helius
 * † Helius collemus – type locality for species
 * † Helix – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Helix sp.
 * † Hemiauchenia – or unidentified comparable form
 * † Hemiauchenia
 * † Hemiauchenia gracilis
 * † Hemiauchenia guanajuatensis – type locality for species
 * † Hemiauchenia macrocephala – or unidentified comparable form
 * † Hemiauchenia macrocephala
 * † Hemiauchenia sp.
 * † Hemicythere
 * † Hemicythere sp.
 * † Hemicytheridea
 * † Hemicytheridea sp.
 * † Hemipristis
 * † Hemipristis heteropleurus
 * † Hemipristis serra
 * † Hemipristis sp.
 * † Hemirraghus
 * † Hemirraghus sp.
 * † Hemisinus
 * † Hemisinus adjuntaensis – type locality for species
 * † Hemisinus miralejas
 * † Hemisinus reticulosus – type locality for species
 * † Hemisinus siliceus
 * † Hemisurcula
 * † Hemisurcula eosilicata
 * † Hemitoma
 * † Hemitoma sp.
 * † Henria – tentative report
 * † Henria sp.
 * † Hepatella
 * † Hepatella amazonica
 * † Hercoglossa
 * † Hercoglossa popenoei – type locality for species
 * † Hercoglossa sp. – tentative report
 * † Hercoglossa ulrichi – or unidentified comparable form
 * † Hercostomus – tentative report
 * † Hercostomus sp.
 * † Here
 * † Here edwilsoni
 * † Here excavata
 * † Hermanites
 * † Hermanites sp.
 * † Herpetocetus – or unidentified related form
 * † Herpetocetus sp.
 * † Hespererato
 * † Hespererato columbella
 * † Hespererato maugeriae
 * † Hespererato vitellina
 * † Hesperiturris
 * † Hesperiturris zacatensis
 * † Hesperomys
 * † Hesperomys taylori
 * † Hesperotestudo
 * † Hesperotestudo sp.
 * † Heterocoenia
 * † Heterocoenia sp. – tentative report
 * † Heterodonax
 * † Heterodonax pacificus
 * † Heterodontus
 * † Heterodontus sp.
 * † Heterostegina
 * † Heterostegina sp. – tentative report
 * † Heteroterma
 * † Heteroterma gabbi
 * † Heterotermes
 * † Heterotermes primaevus – type locality for species
 * † Heterotermes sp.
 * † Hexacorbula
 * † Hexacorbula gatunensis – or unidentified comparable form
 * † Hexanchus
 * † Hexanchus griseus
 * † Hexaplex – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Hexaplex
 * † Hexaplex erythrostomus – tentative report
 * † Hexaplex erythrostomus – or unidentified related form
 * † Hexaplex erythrostomus – or unidentified comparable form
 * † Hexaplex erythrostomus
 * † Hexobelomeryx – tentative report
 * † Hexobelomeryx
 * † Hexobelomeryx fricki – type locality for species
 * † Hexobelomeryx fricki – tentative report
 * † Hexobelomeryx fricki – or unidentified comparable form
 * † Hexobelomeryx fricki
 * † Hexobelomeryx sp.
 * † Hiatella
 * † Hiatella arctica
 * † Hindsiclava
 * † Hindsiclava alesidota
 * † Hindsiclava consors
 * † Hindsiclava henekeni – or unidentified comparable form
 * † Hipponix
 * † Hipponix antiquatus
 * † Hipponix barbatus
 * † Hipponix cranioides
 * † Hipponix grayanus
 * † Hipponix panamensis
 * † Hipponix sp.
 * † Hipponix tumens
 * † Hippotherium – or unidentified related form
 * † Hippotherium sp.
 * † Hodomys
 * † Hodomys alleni
 * † Hodomys sp.
 * † Holmesina
 * † Holmesina septentrionalis
 * † Holmesina sp.
 * † Holospira
 * † Holospira eva – tentative report
 * † Holospira eva
 * † Homalopoma
 * † Homalopoma carpenteri – or unidentified comparable form
 * † Homalopoma carpenteri
 * † Homalopoma luridum
 * † Homola
 * † Homola bajaensis
 * † Homotherium – or unidentified comparable form
 * † Homotherium sp.
 * † Hyalina
 * † Hyalina californica
 * † Hydrochoerus
 * † Hydrochoerus sp.
 * † Hydrodamalis
 * † Hydrodamalis cuestae
 * † Hydrodamalis sp.
 * † Hydroides
 * † Hydroides sp.
 * † Hymenorus
 * † Hymenorus chiapasensis – type locality for species
 * † Hyopsodus – or unidentified comparable form
 * † Hyopsodus sp.
 * † Hyotissa
 * † Hyotissa haitensis
 * † Hyotissa hyotis
 * † Hypertragulus
 * † Hypertragulus heikeni – type locality for species
 * † Hypolagus
 * † Hypolagus ringoldensis – or unidentified comparable form
 * † Hypolagus vetus
 * † Hyptia
 * † Hyptia deansi – type locality for species
 * † Hyracodon – tentative report
 * † Hyracodon sp.
 * † Hysteroconcha
 * † Hysteroconcha lupanaria
 * † Ictalurus
 * † Ictalurus spodius – or unidentified comparable form
 * † Icterus
 * † Icterus spurius
 * † Ictinia
 * † Ictinia sp.
 * † Ictiobus
 * † Ictiobus aguilerai – type locality for species
 * † Ictiobus sp.
 * † Iddingsia – tentative report
 * † Iddingsia sp.
 * † Iliacantha
 * † Iliacantha panamica
 * † Ilyocypris
 * † Ilyocypris bradyi
 * † Incisitermes
 * † Incisitermes krishnai – type locality for species
 * † Incisitermes krishnai
 * † Indopacetus
 * † Indopacetus pacificus
 * † Inga
 * † Inga miocenica – type locality for species
 * † Irusella
 * † Irusella lamellifera
 * † Ischnoptera
 * † Ischnoptera sp.
 * † Isognomon
 * † Isognomon recognitus
 * † Isophyllia
 * † Isophyllia rigida
 * † Isophyllia sinuosa
 * † Isotomurus
 * † Isotomurus retardatus
 * † Isurus
 * † Isurus benedeni
 * † Isurus oxyrinchus
 * † Isurus plana
 * † Isurus planus
 * † Isurus precursor – or unidentified comparable form
 * † Isurus sp.
 * † Jamilcotatus – type locality for genus
 * † Jamilcotatus kumiaica – type locality for species
 * † Japonactaeon
 * † Japonactaeon punctostriata
 * † Jaton
 * † Jaton festiva
 * † Jaton festivus
 * † Jaywilsonomys
 * † Jaywilsonomys ojinagaensis – type locality for species
 * † Jenneria
 * † Jenneria pustulata
 * † Jimomys – or unidentified related form
 * † Jimomys sp.
 * † Jouannetia
 * † Jouannetia francesae
 * † Jugosocythereis
 * † Jugosocythereis vicksburgensis
 * † Juliacorbula
 * † Juliacorbula bicarinata
 * † Juliacorbula luteola – or unidentified comparable form
 * † Juliacorbula luteola
 * † Kapalmerella
 * † Kapalmerella arenicola
 * † Kapalmerella mortoni
 * † Kelletia
 * † Kelletia kelleti
 * † Kellia
 * † Kellia suborbicularis
 * † Kellyella
 * † Kellyella texana – tentative report
 * † Kentriodon – or unidentified related form
 * † Kentriodon
 * † Kentriodon diusinus – type locality for species
 * † Kentriodon sp.
 * † Kinosternon
 * † Kinosternon sp.
 * † Knefastia
 * † Knefastia olivacea
 * † Knefastia olivaceus
 * † Kogia
 * † Kogia breviceps
 * † Krithe – tentative report
 * † Krithe
 * † Krithe hiwanneensis
 * † Krithe vicksburgensis
 * † Kuphus
 * † Kuphus incrassatus
 * † Kurtziella – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Kurtziella
 * † Kurtziella plumbea
 * † Kurtziella serta
 * † Kurtziella stenotella
 * † Lacinia
 * † Lacinia santander
 * † Lacuna
 * † Lacuna carinata
 * † Lacuna unifasciata
 * † Laevicardium
 * † Laevicardium elatum
 * † Laevicardium laevicardium
 * † Laevicardium serratum
 * † Laevicardium substriatum
 * † Lagenodelphis
 * † Lagenodelphis hosei
 * † Lagueus
 * † Lagueus californicus
 * † Lamellaria
 * † Lamellaria diegoensis – or unidentified comparable form
 * † Lamprolithax
 * † Lamprolithax sp.
 * † Lampropeltis
 * † Lampropeltis intermedius
 * † Lapparia
 * † Lapparia nuda – or unidentified comparable form
 * † Lasaea
 * † Lasaea adansoni
 * † Lasaea sp.
 * † Latirus – tentative report
 * † Latirus
 * † Latirus moorei – tentative report
 * † Latirus neoulios
 * † Latirus sp.
 * † Lecythidophyllum
 * † Lecythidophyllum couratarioides – type locality for species
 * † Ledina
 * † Ledina smirna – tentative report
 * † Ledina smirna
 * † Leguminocythereis
 * † Leguminocythereis sp.
 * † Leguminosites
 * † Leguminosites mexicanus – type locality for species
 * † Leguminosites oaxacensis – type locality for species
 * † Leopecten
 * † Leopecten bakeri
 * † Leopecten macdonaldi – or unidentified comparable form
 * † Leopecten stillmani – or unidentified comparable form
 * † Lepicythara
 * † Lepicythara sp.
 * † Lepidocyclina
 * † Lepidocyclina antillea
 * † Lepidocyclina macdonaldi
 * † Lepidocyclina sp.
 * † Lepidocyrtus
 * † Lepidocyrtus geayi – or unidentified comparable form
 * † Lepidocyrtus sp.
 * † Lepidozona
 * † Lepidozona pectinulatus
 * † Lepidozona sp.
 * † Lepilucina
 * † Lepilucina gratis – or unidentified comparable form
 * † Leptarctus
 * † Leptarctus sp.
 * † Leptochoerus
 * † Leptochoerus sp.
 * † Leptochromus
 * † Leptochromus palaeomexicanus – type locality for species
 * † Leptodactylus
 * † Leptodactylus labialis
 * † Leptohyphes
 * † Leptohyphes sp.
 * † Leptomeryx – or unidentified comparable form
 * † Leptomeryx sp.
 * † Leptomussa
 * † Leptomussa sp.
 * † Leptonannus
 * † Leptonannus miocenicus – type locality for species
 * † Leptonycteris
 * † Leptonycteris nivalis
 * † Leptopecten
 * † Leptopecten latiauratus
 * † Leptopecten latiauritus
 * † Leptopecten praevalidus – type locality for species
 * † Leptopecten tumbezensis – or unidentified related form
 * † Leptopharsa
 * † Leptopharsa tacanae – type locality for species
 * † Leptosalda – type locality for genus
 * † Leptosalda chiapensis – type locality for species
 * † Leptoseris
 * † Leptoseris portoricensis – or unidentified comparable form
 * † Lepus
 * † Lepus californicus – or unidentified comparable form
 * † Lepus sp.
 * † Lestodiplosis – tentative report
 * † Lestodiplosis
 * † Lestodiplosis sp.
 * † Lestremia
 * † Lestremia sp.
 * † Leukoma
 * † Leukoma grata
 * † Leukoma staminea
 * † Levicyclus – type locality for genus
 * † Levicyclus
 * † Levicyclus tepetate – type locality for species
 * † Levicyclus tepetate
 * † Levifusus
 * † Levifusus sp.
 * † Lima
 * † Lima kennedyi – type locality for species
 * † Lima tetrica
 * † Limnaea
 * † Limnaea sp.
 * † Limopsis
 * † Limopsis aguilari
 * † Linthia
 * † Linthia caraibensis – or unidentified comparable form
 * † Linuparus
 * † Linuparus wilcoxensis
 * † Liolithax
 * † Liolithax kernensis – tentative report
 * † Liolithax kernensis – or unidentified related form
 * † Liomys
 * † Liomys irroratus
 * † Liotia
 * † Liotia woodringi
 * † Liposcelis
 * † Liposcelis sp.
 * † Liquidambar
 * † Liquidambar incerta – type locality for species
 * † Lirophora
 * † Lirophora falconensis
 * † Lirophora latilirata
 * † Lirophora mactropsis
 * † Lirophora mariae
 * † Lithophaga
 * † Lithophaga sp.
 * † Lithophysema
 * † Lithophysema stewarti
 * † Lithoseopsis
 * † Lithoseopsis elongata – type locality for species
 * † Lithoseopsis elongata
 * † Lithothamnion – tentative report
 * † Lithothamnion sp.
 * † Litorhadia
 * † Litorhadia compsa
 * † Litorhadia mater – tentative report
 * † Litorhadia santaanai – tentative report
 * † Litorhadia santaanai
 * † Littorina
 * † Littorina keenae
 * † Littorina planaxis
 * † Littorina scutulata
 * † Litus
 * † Litus mexicanus – type locality for species
 * † Lobatus
 * † Lobatus gigas
 * † Lobonotus
 * † Lobonotus mexicanus
 * † Longchaeus
 * † Longchaeus canaliculata
 * † Longchaeus diademata
 * † Longusorbis
 * † Longusorbis eutychius
 * † Lontra
 * † Lontra canadensis
 * † Lopha
 * † Lopha veatchii
 * † Lopha vicksburgensis
 * † Lophoranina
 * † Lophoranina bishopi – type locality for species
 * † Lophoranina bishopi
 * † Lophoranina cristaspina
 * † Lophoranina precocious
 * † Lottia
 * † Lottia digitalis
 * † Lottia gigantea
 * † Lottia limatula
 * † Lottia scabra
 * † Lottia stanfordiana
 * † Loxoconcha
 * † Loxoconcha woodwardsensis – or unidentified related form
 * † Lucapinella
 * † Lucapinella callomarginata
 * † Lucina
 * † Lucina pectinata
 * † Lucina sp.
 * † Lucinia
 * † Lucinia nuttalli
 * † Lucinisca
 * † Lucinisca nuttalli
 * † Lucinisca sp.
 * † Lucinoma
 * † Lucinoma annulatum
 * † Lunatia
 * † Lunatia lacrimans
 * † Lustrochernes – tentative report
 * † Lustrochernes sp. 1informal
 * † Lustrochernes sp. 2informal
 * † Lutjanus
 * † Lutjanus novemfasciatus – or unidentified comparable form
 * † Lyncina
 * † Lyncina amygdalina – or unidentified comparable form
 * † Lynx
 * † Lynx rufus
 * † Lynx sp.
 * † Lyria
 * † Lyria andersoni
 * † Lyrischapa
 * † Lyrischapa lajollaensis
 * † Lyrischapa spinifera
 * † Lyropecten
 * † Lyropecten crassicardo – or unidentified comparable form
 * † Lyropecten crassicardo
 * † Lyropecten dumblei
 * † Lyropecten gallegosi – type locality for species
 * † Lyropecten miguelensis
 * † Lyropecten modulatus
 * † Lyropecten nicholsi – or unidentified comparable form
 * † Lyropecten nicholsi
 * † Lyropecten pretiosus
 * † Lyropecten sp.
 * † Lyssomanes
 * † Lyssomanes sp.
 * † Maatidesmus – type locality for genus
 * † Maatidesmus paachtun – type locality for species
 * † Maccaffertium
 * † Maccaffertium annae – type locality for species
 * † Machairodus
 * † Machairodus sp.
 * † Macoma
 * † Macoma indentata
 * † Macoma nasuta
 * † Macoma secta
 * † Macoma sp.
 * † Macroacaena
 * † Macroacaena venturai
 * † Macrocallista
 * † Macrocallista squalida
 * † Macrocallista squalidus
 * † Macrocypraea
 * † Macrocypraea veintensis – type locality for species
 * † Macron
 * † Macron aethiops
 * † Macron hartmanni – type locality for species
 * † Macron hartmanni
 * † Macron lividus
 * † Mactra
 * † Mactra sp.
 * † Mactromeris
 * † Mactromeris hemphillii
 * † Mactromeris merriami – or unidentified comparable form
 * † Mactromeris sp.
 * † Mactrotoma
 * † Mactrotoma californica
 * † Mactrotoma nasuta
 * † Madracis
 * † Madracis johnwellsi – type locality for species
 * † Maevia – or unidentified comparable form
 * † Maevia sp.
 * † Malea
 * † Malea ringens
 * † Malea ringenss
 * † Malepellis – type locality for genus
 * † Malepellis extincta – type locality for species
 * † Mammut – tentative report
 * † Mammut
 * † Mammut americanum
 * † Mammut sp.
 * † Mammuthus
 * † Mammuthus columbi – or unidentified comparable form
 * † Mammuthus columbi
 * † Mammuthus hayi – or unidentified comparable form
 * † Mammuthus primigenius
 * † Mammuthus sp.
 * † Mancalla
 * † Mancalla cedrosensis – type locality for species
 * † Mancalla cedrosensis
 * † Mancalla sp.
 * † Mangelia
 * † Mangelia variegata
 * † Manota
 * † Manota sp.
 * † Manzonia
 * † Manzonia oldroydae
 * † Manzonia purpurea
 * † Marfilomys
 * † Marfilomys aewoodi
 * † Margarites
 * † Margarites semiornata – or unidentified comparable form
 * † Marginella
 * † Marginella cineracea – or unidentified comparable form
 * † Marginella cineracea
 * † Marginella cordiformis
 * † Marginella dalli
 * † Marginella latior
 * † Marginella succinea – or unidentified comparable form
 * † Marginella willcoxiana
 * † Marmosa
 * † Marmosa canescens
 * † Marmosa mexicana
 * † Marmota
 * † Marmota sp.
 * † Marsupina
 * † Marsupina strongi
 * † Martesia
 * † Martesia sp.
 * † Mastotermes
 * † Mastotermes electromexicus – type locality for species
 * † Mastotermes electromexicus
 * † Mastotermes sp.
 * † Matuna – type locality for genus
 * † Matuna
 * † Matuna bechlyi – type locality for species
 * † Matuna sp.
 * † Mauicetus – or unidentified related form
 * † Mauicetus sp.
 * † Maxwellia
 * † Maxwellia gemma
 * † Maxwellia santarosana
 * † Meandrina
 * † Meandrina antiguensis
 * † Meandrina meandrites
 * † Medetera
 * † Medetera amissa – type locality for species
 * † Medetera sp.
 * † Medetera totolapa – type locality for species
 * † Megabalanus
 * † Megabalanus californicus
 * † Megabalanus tintinnabulum – or unidentified comparable form
 * † Megabalanus tintinnabulum
 * † Megalonyx
 * † Megalonyx sp.
 * † Megalonyx wheatleyi
 * † Megapaloelodus – tentative report
 * † Megapaloelodus opsigonus
 * † Megaselia
 * † Megaselia sp.
 * † Megatebennus
 * † Megatebennus bimaculata
 * † Megatylopus – tentative report
 * † Megatylopus
 * † Megatylopus matthewi – or unidentified comparable form
 * † Megatylopus sp.
 * † Megistostoma
 * † Megistostoma gabbianum
 * † Meioceras
 * † Meioceras constrictum
 * † Melampus
 * † Melampus mousleyi
 * † Melanatria – tentative report
 * † Melanatria
 * † Melanatria sp.
 * † Melanatria ypresiana – type locality for species
 * † Melastomites
 * † Melastomites angustus – type locality for species
 * † Melastomites obovatus – type locality for species
 * † Melastomites obovatus
 * † Meleagris
 * † Meleagris gallopavo
 * † Melongena
 * † Melongena melongena
 * † Melongena patula
 * † Meniscotherium
 * † Meniscotherium chamense
 * † Menoceras
 * † Menoceras barbouri
 * † Meoma
 * † Meoma sp.
 * † Mephitis
 * † Mephitis mephitis
 * † Meretrix
 * † Meretrix concinna
 * † Merriamaster – or unidentified comparable form
 * † Merriamaster pacificus
 * † Merychippus – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Merychippus
 * † Merychippus primus – or unidentified comparable form
 * † Merychippus sejunctus – or unidentified comparable form
 * † Merychippus sp.
 * † Merychyus
 * † Merychyus elegans – or unidentified comparable form
 * † Merychyus minimus – or unidentified related form
 * † Merycodus
 * † Merycodus sabulonis
 * † Merycoidodon
 * † Merycoidodon sp.
 * † Mesalia
 * † Mesalia alabamiensis
 * † Mesalia claibornensis
 * † Mesalia martinezensis – or unidentified comparable form
 * † Mesalia martinezensis
 * † Mesalia sayi
 * † Mesepipsocus
 * † Mesepipsocus clarus – type locality for species
 * † Mesocena
 * † Mesocena apiculata
 * † Mesodesma
 * † Mesodesma singleyi
 * † Mesohippus
 * † Mesohippus sp.
 * † Mesorhaga
 * † Mesorhaga pseudolacrymans – type locality for species
 * † Mesorhaga pseudolacrymans
 * † Mespilodaphne
 * † Mespilodaphne palomaresensis – type locality for species
 * † Metaxytherium
 * † Metaxytherium arctodites – type locality for species
 * † Metopina
 * † Metopina sp.
 * † Metulella
 * † Metulella fusiformis
 * † Micrempis
 * † Micrempis brevis – type locality for species
 * † Microdrillia
 * † Microdrillia isthmica
 * † Microdrillia istmica
 * † Microgaza
 * † Microgaza santarosaensis
 * † Micromalthus
 * † Micromalthus debilis
 * † Microporella
 * † Microporella marsupiata
 * † Micropygomyia
 * † Micropygomyia paterna – type locality for species
 * † Microtus
 * † Microtus mexicanus
 * † Microtus pennsylvanicus
 * † Milneria
 * † Milneria kelseyi
 * † Miohippus
 * † Miohippus assinoboiensis
 * † Mionelater – type locality for genus
 * † Mionelater planatus – type locality for species
 * † Miracinonyx
 * † Miracinonyx studeri – or unidentified comparable form
 * † Mirometa – type locality for genus
 * † Mirometa valdespinosa – type locality for species
 * † Mirounga
 * † Mirounga angustirostris
 * † Mistura – type locality for genus
 * † Mistura perplexa – type locality for species
 * † Mitra
 * † Mitra catalinae
 * † Mitra eucadoriana
 * † Mitra fulgurita – or unidentified comparable form
 * † Mitra idae – tentative report
 * † Mitra idae
 * † Mitra rupicola
 * † Mitra sp.
 * † Mitra striolata
 * † Mitrella
 * † Mitrella asema
 * † Mitrella carinata
 * † Mitrella debooyi
 * † Mitrella guttata
 * † Mitrella tuberosa
 * † Mitromorpha
 * † Mitromorpha aspera
 * † Mitromorpha filosa
 * † Mnemosyne – tentative report
 * † Mnemosyne sp.
 * † Mobula
 * † Mobula sp.
 * † Mochloribatula
 * † Mochloribatula smithi – type locality for species
 * † Modiolus
 * † Modiolus capax
 * † Modiolus carpenteri
 * † Modisimus
 * † Modisimus sp.
 * † Modulus
 * † Modulus cerodes
 * † Modulus disculus
 * † Molothrus
 * † Molothrus aeneus
 * † Molothrus ater
 * † Monardia – tentative report
 * † Monardia sp.
 * † Monoplex
 * † Monoplex aquatilis
 * † Monoplex parthenopeus
 * † Montastrea
 * † Montastrea antilliana
 * † Montastrea bainbridgensis
 * † Montastrea cavernosa
 * † Montastrea gabbi
 * † Montastrea laurae – type locality for species
 * † Montastrea limbata
 * † Montastrea tampaensis
 * † Montezumella
 * † Montezumella amenosi
 * † Montezumella tubulata
 * † Mopalia
 * † Mopalia ciliata
 * † Mopalia hindsi
 * † Mopalia muscosa
 * † Moquillea
 * † Moquillea mexicana – type locality for species
 * † Morula
 * † Morula lugubris
 * † Morum
 * † Morum oniscus
 * † Morus
 * † Morus sp.
 * † Muracypraea
 * † Muracypraea sp.
 * † Murex
 * † Murex chipolanus
 * † Murex mississippiensis
 * † Murex sp.
 * † Murexella
 * † Murexella sp.
 * † Murexiella
 * † Murexiella macgintyi
 * † Murexiella veracruzana – type locality for species
 * † Murexsul
 * † Murexsul thalmanni – type locality for species
 * † Muricanthus
 * † Muricanthus nigritus
 * † Muricanthus radix
 * † Murrayina
 * † Murrayina gunteri
 * † Musculus
 * † Musculus carlotae
 * † Mussa
 * † Mussa angulosa
 * † Mustela
 * † Mustela nigripes
 * † Mustela reliquus – type locality for species
 * † Mustelus
 * † Mustelus sp.
 * † Mycetobia
 * † Mycetobia sp.
 * † Mycetophyllia
 * † Mycetophyllia bullbrooki
 * † Myliobatis
 * † Myliobatis sp.
 * † Myopsocus
 * † Myopsocus sp.
 * † Myotis
 * † Myotis sp.
 * † Myrcia
 * † Myrcia saraviana – type locality for species
 * † Myrmecophaga
 * † Myrmecophaga tridactyla
 * † Mysmena
 * † Mysmena fossilis – type locality for species
 * † Mytilus
 * † Mytilus californianus
 * † Mytilus mathewsonii – or unidentified comparable form
 * † Mytilus mathewsonii
 * † Mytilus multiformis
 * † Mytilus sp.
 * † Mytonomys
 * † Mytonomys gaitania
 * † Nannippus – tentative report
 * † Nannippus
 * † Nannippus aztecus – or unidentified comparable form
 * † Nannippus aztecus
 * † Nannippus peninsulatus
 * † Nannippus sp.
 * † Nannocetus – or unidentified related form
 * † Nannocetus sp.
 * † Nannodiella
 * † Nannodiella rintriada
 * † Nannohelea
 * † Nannohelea sp.
 * † Nanosiren
 * † Nanosiren garciae – or unidentified comparable form
 * † Nanotragulus
 * † Nanotragulus sp.
 * † Nassa
 * † Nassa fossata
 * † Nassa mendica
 * † Nassa perpinguis – or unidentified related form
 * † Nassa perpinguis
 * † Nassarina
 * † Nassarina wadei
 * † Nassarius – tentative report
 * † Nassarius
 * † Nassarius cerralvensis
 * † Nassarius delosi
 * † Nassarius fossatus
 * † Nassarius leucops – or unidentified comparable form
 * † Nassarius mendicus
 * † Nassarius pacis
 * † Nassarius perpingus
 * † Nassarius sp.
 * † Nassarius tegulus
 * † Nassarius tehuantepecensis
 * † Nassarius versicolor
 * † Nassarius waltonensis – tentative report
 * † Nassarius zacatensis
 * † Nasutitermes
 * † Nasutitermes electrinus – type locality for species
 * † Nasutitermes electrinus
 * † Nasutitermes sp.
 * † Natica
 * † Natica alazana
 * † Natica chemnitzii
 * † Natica dumblei – or unidentified comparable form
 * † Natica perspecta – tentative report
 * † Natica sp.
 * † Naticarius
 * † Naticarius canrena – or unidentified comparable form
 * † Naticarius canrena
 * † Navahoceros
 * † Navahoceros fricki
 * † Navicula
 * † Navicula clavata – or unidentified comparable form
 * † Navicula lyra
 * † Nayadina
 * † Nayadina batequensis
 * † Neaeromya
 * † Neaeromya obliqua
 * † Nebrius
 * † Nebrius sp.
 * † Necronectes
 * † Necronectes nodosa – type locality for species
 * † Necronectes sp.
 * † Necronectes tajinensis – type locality for species
 * † Necronectes tajinensis
 * † Nectandra
 * † Nectandra areolata
 * † Nectandra tehuantepecensis – type locality for species
 * † Negaprion
 * † Negaprion sp.
 * † Nehalennia
 * † Nehalennia sp.
 * † Neivamyrmex
 * † Neivamyrmex sp.
 * † Nemocardium
 * † Nemocardium diversum – tentative report
 * † Nemocardium linteum
 * † Neobernaya
 * † Neobernaya spadicea
 * † Neocallichirus
 * † Neocallichirus aetodes
 * † Neocallichirus rhinos – or unidentified comparable form
 * † Neocallichirus sp.
 * † Neocallichirus vaughani
 * † Neochoerus
 * † Neochoerus sp.
 * † Neoconorbina
 * † Neoconorbina terquemi – or unidentified comparable form
 * † Neocrepidodera
 * † Neocrepidodera antiqua – type locality for species
 * † Neoerythromma
 * † Neoerythromma sp.
 * † Neohipparion
 * † Neohipparion eurystyle – type locality for species
 * † Neohipparion eurystyle
 * † Neohipparion sp.
 * † Neoliodes
 * † Neoliodes brevitarsus – type locality for species
 * † Neomachilellus – tentative report
 * † Neomachilellus
 * † Neomachilellus ezetaelenensis – type locality for species
 * † Neomachilellus ezetaelenensis
 * † Neomachilellus sp.
 * † Neomonachus
 * † Neomonachus tropicalis
 * † Neoparentia
 * † Neoparentia chiapensis – type locality for species
 * † Neorapana
 * † Neorapana tuberculata
 * † Neotanygastrella
 * † Neotanygastrella wheeleri – type locality for species
 * † Neotanygastrella wheeleri
 * † Neotherium – or unidentified related form
 * † Neotherium
 * † Neotherium sp.
 * † Neotoma
 * † Neotoma albigula
 * † Neotoma cinerea – tentative report
 * † Neotoma floridana – or unidentified comparable form
 * † Neotoma lepida
 * † Neotoma mexicana – tentative report
 * † Neotoma mexicana
 * † Neotoma micropus – tentative report
 * † Neotoma micropus
 * † Neotoma sawrockensis – or unidentified comparable form
 * † Neotoma sp.
 * † Neoulosomus
 * † Neoulosomus hurdi – type locality for species
 * † Neptunea
 * † Neptunea mucronata – or unidentified comparable form
 * † Nerita
 * † Nerita bernardi
 * † Nerita funiculata
 * † Nerita scabricosta
 * † Nerita tampaensis
 * † Neritina
 * † Neritina woodwardi
 * † Neverita
 * † Neverita limula
 * † Neverita reclusiana
 * † Neverita reclusianus – or unidentified comparable form
 * † Neverita reclusianus
 * † Neverita recluzianus – or unidentified comparable form
 * † Neverita recluzianus
 * † Neverita sp.
 * † Niso
 * † Niso interrupta
 * † Niso willcoxiana
 * † Niveria
 * † Niveria suffusa
 * † Nodipecten
 * † Nodipecten cerrosensis – or unidentified comparable form
 * † Nodipecten cerrosensis
 * † Nodipecten collierensis
 * † Nodipecten estrellanus – or unidentified comparable form
 * † Nodipecten nodosus
 * † Nodipecten subnodosus
 * † Nodipecten veatchii
 * † Nodulus
 * † Nodulus kelseyi
 * † Nogodina
 * † Nogodina chiapaneca – type locality for species
 * † Nogueirapis
 * † Nogueirapis silacea – type locality for species
 * † Nogueirapis silacea
 * † Norrisia
 * † Norrisia norrisi
 * † Nothrotheriops
 * † Nothrotheriops sp.
 * † Nothrotheriops texanus
 * † Nothrotherium
 * † Nothrotherium shastense – or unidentified comparable form
 * † Nothrotherium sp.
 * † Notiosorex
 * † Notiosorex crawfordi
 * † Notiosorex repenningi
 * † Notolagus
 * † Notolagus sp.
 * † Notolagus velox – type locality for species
 * † Notolagus velox
 * † Notopus
 * † Notopus minutus
 * † Notorhynchus
 * † Notorhynchus sp.
 * † Nucella
 * † Nucella emarginata
 * † Nucella lamellosa
 * † Nucleopsis
 * † Nucleopsis sp.
 * † Nucula
 * † Nucula declivis
 * † Nucula mauricensis
 * † Nucula sphenopsis
 * † Nucula tenuisculpta
 * † Nuculana
 * † Nuculana acuta
 * † Nuculana sp.
 * † Nummulites
 * † Nummulites floridensis
 * † Nummulites panamensis
 * † Nummulites striatoreticulatus
 * † Nummulites willcoxi
 * † Nutricola
 * † Nutricola tantilla
 * † Nuttallia
 * † Nuttallia nuttallii
 * † Nuttallia toulai – type locality for species
 * † Nuttallia toulai
 * † Nuttallina
 * † Nuttallina californica
 * † Ocenebra
 * † Ocenebra foveolata
 * † Ocenebra interfossa
 * † Ocenebra poulsoni
 * † Ochlerotatus
 * † Ochlerotatus sp. 1informal
 * † Ochlerotatus sp. 2informal
 * † Odocoileus – tentative report
 * † Odocoileus – or unidentified comparable form
 * † Odocoileus
 * † Odocoileus hemionus
 * † Odocoileus sp.
 * † Odontaspis – tentative report
 * † Odontaspis
 * † Odontaspis acutissima
 * † Odontaspis sp.
 * † Odontogryphaea
 * † Odontogryphaea thirsae – tentative report
 * † Odontogryphaea thirsae
 * † Odontoporella
 * † Odontoporella adpressa
 * † Odontopteryx – tentative report
 * † Odontopteryx sp.
 * † Odostomia
 * † Odostomia aepynota
 * † Odostomia donilla – or unidentified comparable form
 * † Odostomia io – or unidentified comparable form
 * † Odostomia navisa
 * † Odostomia phanea
 * † Odostomia phanella – or unidentified comparable form
 * † Odostomia sp.
 * † Odostomia terebellum
 * † Odostomia trachis
 * † Odostomia virginalis
 * † Oeclixius – type locality for genus
 * † Oeclixius amphion – type locality for species
 * † Olequahia
 * † Olequahia domenginica
 * † Oliarus
 * † Oliarus sp. 1informal
 * † Oliarus sp. 2informal
 * † Oligaphelenchoides – type locality for genus
 * † Oligaphelenchoides atrebora – type locality for species
 * † Oligodiodon
 * † Oligodiodon vetus – or unidentified comparable form
 * † Oligodiodon vetus
 * † Oligodiplogaster – type locality for genus
 * † Oligodiplogaster antiqua – type locality for species
 * † Oliva
 * † Oliva corticata
 * † Oliva cristobalcoloni
 * † Oliva cylindrica – or unidentified comparable form
 * † Oliva cylindrica
 * † Oliva davisac
 * † Oliva incrassata
 * † Oliva liodes – or unidentified comparable form
 * † Oliva liodes
 * † Oliva mendezensis
 * † Oliva mississippiense
 * † Oliva mississippiensis – tentative report
 * † Oliva mississippiensis
 * † Oliva polpasta – or unidentified comparable form
 * † Oliva sayana – or unidentified comparable form
 * † Oliva sayana
 * † Oliva sp.
 * † Oliva spicata
 * † Oliva subplicata
 * † Oliva venulata – or unidentified related form
 * † Olivella – tentative report
 * † Olivella
 * † Olivella baetica
 * † Olivella biplicata
 * † Olivella blastoides
 * † Olivella dama – or unidentified comparable form
 * † Olivella dama
 * † Olivella gracilis
 * † Olivella mathewsonii
 * † Olivella mutica
 * † Olivella pedroana
 * † Onychomys
 * † Onychomys leucogaster
 * † Onychomys sp.
 * † Opalia
 * † Opalia chacei
 * † Opalia insculpta
 * † Opalia wroblewskyi
 * † Operculina
 * † Operculina sp.
 * † Ophiodennella
 * † Ophiodennella graciosana
 * † Ophiodermella
 * † Ophiodermella incisa
 * † Ophiodermella ophioderma
 * † Ophiomorpha
 * † Ophiomorpha sp.
 * † Oplegnathus
 * † Oplegnathus sp.
 * † Oppia
 * † Oppia hurdi – type locality for species
 * † Oppia mexicana – type locality for species
 * † Oppia mexicana
 * † Oppia setigera – type locality for species
 * † Orbicella
 * † Orbicella annularis
 * † Orbicella franksi – or unidentified comparable form
 * † Orbitulina
 * † Orbitulina universa
 * † Orchestina
 * † Orchestina mortua – type locality for species
 * † Orchestina mortua
 * † Orcinus
 * † Orcinus orca
 * † Oregonia
 * † Oregonia spinifera – type locality for species
 * † Oregonia spinifera
 * † Orfelia
 * † Orfelia sp. 1informal
 * † Orfelia sp. 2informal
 * † Orthaulax
 * † Orthaulax pugnax
 * † Orthogeomys
 * † Orthogeomys sp.
 * † Orthophragmina
 * † Orthophragmina sp.
 * † Orthosurcula
 * † Orthosurcula longipersa
 * † Orthosurcula longispersa
 * † Orthoyoldia
 * † Orthoyoldia psammotaea
 * † Oryzomys
 * † Oryzomys palustris
 * † Ostrea
 * † Ostrea angelica – or unidentified comparable form
 * † Ostrea angelica
 * † Ostrea bougeoisii
 * † Ostrea conchaphila
 * † Ostrea costaricensis
 * † Ostrea duvali
 * † Ostrea eothirsae – tentative report
 * † Ostrea eothirsae
 * † Ostrea erici
 * † Ostrea escondidia
 * † Ostrea gierharti
 * † Ostrea intermedoides – or unidentified comparable form
 * † Ostrea lurida
 * † Ostrea parrensis
 * † Ostrea popaensis
 * † Ostrea sp.
 * † Ostrea strictiplicata
 * † Ostrea tayloriana
 * † Otodus
 * † Otodus megalodon
 * † Otodus rectus
 * † Ovis
 * † Ovis sp.
 * † Ovulum
 * † Ovulum sp. – tentative report
 * † Oxyaena – or unidentified comparable form
 * † Oxyaena sp.
 * † Oxydactylus – or unidentified comparable form
 * † Oxydactylus
 * † Oxydactylus longipes
 * † Oxypoda
 * † Oxypoda binodosa – type locality for species
 * † Oxyura
 * † Oxyura zapatanima – type locality for species
 * † Pachycondyla
 * † Pachycondyla sp. 1informal
 * † Pachycondyla sp. 2informal
 * † Pachycondyla sp. 3informal
 * † Pachycrommium
 * † Pachycrommium clarki
 * † Pachygaster
 * † Pachygaster antiqua – type locality for species
 * † Paenemarmota
 * † Paenemarmota barbouri
 * † Paenemarmota mexicana
 * † Paenemarmota sp.
 * † Paguristes
 * † Paguristes mexicanussensu lato
 * † Paguristes mexicanus
 * † Palaeogryon
 * † Palaeogryon muesebecki
 * † Palaeolama – or unidentified comparable form
 * † Palaeolama sp.
 * † Palaeopinnixa
 * † Palaeopinnixa perornata
 * † Palaeopsammia
 * † Palaeopsammia zitteli
 * † Palaeotetradonema – type locality for genus
 * † Palaeotetradonema phlebotomae – type locality for species
 * † Palaminus
 * † Palaminus sp.
 * † Paleograssiella – type locality for genus
 * † Paleograssiella chiapanicum – type locality for species
 * † Paleoparadoxia – or unidentified related form
 * † Paleoparadoxia sp.
 * † Palmerella – tentative report
 * † Palmerella sp.
 * † Paludestrina
 * † Paludestrina sp.
 * † Pampatherium
 * † Pampatherium mexicanum – type locality for species
 * † Pampatherium mexicanum – or unidentified comparable form
 * † Pampatherium mexicanum
 * † Pandanaris
 * † Pandanaris convexa
 * † Panopea
 * † Panopea floridana
 * † Panopea globosa
 * † Panopea oblongata – tentative report
 * † Panopea parawhitfieldi
 * † Panthera
 * † Panthera leo
 * † Panthera onca – or unidentified comparable form
 * † Panthera onca
 * † Paphonotia
 * † Paphonotia elliptica
 * † Papyridea
 * † Papyridea aspersa
 * † Paracorallicarcinus
 * † Paracorallicarcinus tricarinatus
 * † Paracyathus
 * † Paracyathus sp.
 * † Paracyathus stearnsii
 * † Paracytheridea
 * † Paracytheridea belhavenensis
 * † Paradipsosaurus – type locality for genus
 * † Paradipsosaurus mexicanus – type locality for species
 * † Paraliochthonius
 * † Paraliochthonius miomaya – type locality for species
 * † Paramylodon
 * † Paramylodon harlani
 * † Paramylodon sp.
 * † Paranotolagus – tentative report
 * † Paranotolagus
 * † Paranotolagus complicatus – type locality for species
 * † Paranotolagus complicatus
 * † Paranotolagus sp.
 * † Parapaenemarmota
 * † Parapaenemarmota pattersoni
 * † Parapimodus
 * † Parapimodus denaius – type locality for species
 * † Parapontoporia – type locality for genus
 * † Parapontoporia pacifica – type locality for species
 * † Paraseraphs
 * † Paraseraphs erracticus
 * † Paraseraphs erraticus
 * † Parastemmiulus – type locality for genus
 * † Parastemmiulus elektron – type locality for species
 * † Paratemnoides – tentative report
 * † Paratemnoides sp.
 * † Parathranium
 * † Parathranium tenuipes
 * † Paratoceras – or unidentified comparable form
 * † Paratoceras
 * † Paratoceras sp.
 * † Paratoceras tedfordi – type locality for species
 * † Paraverrucoides
 * † Paraverrucoides alabamensis
 * † Parietobalaena – or unidentified related form
 * † Parietobalaena sp.
 * † Parisis
 * † Parisis batequensis – type locality for species
 * † Parona
 * † Parona sp.
 * † Paronella – tentative report
 * † Paronella sp.
 * † Parvilucina
 * † Parvilucina mazatlanica
 * † Patinopecten
 * † Patinopecten boesei
 * † Patinopecten bosei
 * † Patinopecten coosensis – or unidentified comparable form
 * † Patinopecten dilleri
 * † Patinopecten healeyi
 * † Patinopecten healyi
 * † Patinopecten santarosaliensis – type locality for species
 * † Patinopecten sp.
 * † Pattalophyllia
 * † Pattalophyllia grumi
 * † Pavona
 * † Pavona clavus
 * † Pavona gigantea
 * † Pavona modeloensis – type locality for species
 * † Pavona trinitatis
 * † Pecten
 * † Pecten aletes
 * † Pecten aztecus
 * † Pecten bellus
 * † Pecten byramensis – tentative report
 * † Pecten ceibanus
 * † Pecten condylomatus
 * † Pecten glyptus – or unidentified comparable form
 * † Pecten lecontei – or unidentified related form
 * † Pecten lecontei
 * † Pecten mexicanus
 * † Pecten santarosanus
 * † Pecten sp.
 * † Pedipes
 * † Pedipes liratus
 * † Pelecanus
 * † Pelecanus erythrorhynchus
 * † Peloropeodes
 * † Peloropeodes paleomexicana – type locality for species
 * † Peneroplis
 * † Peneroplis proteus
 * † Penitella
 * † Penitella penita – or unidentified comparable form
 * † Penitella penita
 * † Peponocephala
 * † Peponocephala electra
 * † Peratrimera – type locality for genus
 * † Peratrimera mexicana – type locality for species
 * † Perchoerus
 * † Perchoerus probus
 * † Periglypta
 * † Periglypta multicostata
 * † Periscelis
 * † Periscelis annectans – type locality for species
 * † Perissitys
 * † Perissitys stewarti
 * † Perissocytheridea
 * † Perissocytheridea sp.
 * † Perissolax
 * † Perissolax diga
 * † Perognathus
 * † Perognathus huastecensis
 * † Perognathus sp.
 * † Peromyscus
 * † Peromyscus boylii
 * † Peromyscus leucopus
 * † Peromyscus pectoralis
 * † Peromyscus sp.
 * † Persististrombus
 * † Persististrombus granulatus – or unidentified comparable form
 * † Persististrombus granulatus
 * † Perturbator – type locality for genus
 * † Perturbator corniger – type locality for species
 * † Petaloconchus
 * † Petaloconchus montereyensis – or unidentified comparable form
 * † Petaloconchus sculpturatus
 * † Petaloconchus sp.
 * † Petricola
 * † Petricola carditoides
 * † Petrochirus
 * † Petrochirus sp.
 * † Pewelagus
 * † Pewelagus mexicanus
 * † Phacoides – tentative report
 * † Phacoides
 * † Phacoides californica
 * † Phacoides quintamaia
 * † Phacoides sp.
 * † Phaenolauthia
 * † Phaenolauthia sp.
 * † Phalacrocorax
 * † Phalacrocorax auritus
 * † Phalacrocorax chapalensis – type locality for species
 * † Phalacrocorax goletensis – type locality for species
 * † Phalacrocorax goletensis
 * † Phalium
 * † Phalium globosum
 * † Pheidole
 * † Pheidole sp. 1informal
 * † Pheidole sp. 2informal
 * † Phenacodus
 * † Phenacodus vortmani
 * † Philosepedon
 * † Philosepedon apozonallii – type locality for species
 * † Philosepedon labecula – type locality for species
 * † Philosepedon mexicana – type locality for species
 * † Philosepedon usitata – type locality for species
 * † Phocoena
 * † Phocoena sinus – type locality for species
 * † Phoenicopterus
 * † Phoenicopterus copei
 * † Phoenicopterus stocki – type locality for species
 * † Pholadomya
 * † Pholadomya claibornensis
 * † Pholadomya sp.
 * † Pholeomyia – tentative report
 * † Pholeomyia sp.
 * † Phos
 * † Phos chapai
 * † Phos hilli – tentative report
 * † Phrontis
 * † Phrontis brunneostoma
 * † Phrontis iodes
 * † Phrynosoma
 * † Phrynosoma sp.
 * † Phrynus
 * † Phrynus mexicana – type locality for species
 * † Phugatherium
 * † Phugatherium dichroplax – or unidentified comparable form
 * † Phugatherium dichroplax
 * † Phyllomyza
 * † Phyllomyza hurdi – type locality for species
 * † Phyllonotus
 * † Phyllonotus nitidus
 * † Phyllonotus pomum
 * † Physa
 * † Physa sp.
 * † Physocypria
 * † Physocypria sp.
 * † Piesocorynus
 * † Piesocorynus brevitectus – type locality for species
 * † Piesocorynus elongatus – type locality for species
 * † Piesocorynus parategus – type locality for species
 * † Piesocorynus parvocorpus – type locality for species
 * † Piesocorynus villosus – type locality for species
 * † Pinctada
 * † Pinctada mazatlanica
 * † Pinna
 * † Pinna latrania
 * † Pinna llajasensis
 * † Pinna sp.
 * † Pinnularia
 * † Pinnularia ruttneri
 * † Pintomyia
 * † Pintomyia bolontikui
 * † Pironastrea
 * † Pironastrea antiguensis – or unidentified comparable form
 * † Piscolithax
 * † Piscolithax boreios – type locality for species
 * † Piscolithax tedfordi – type locality for species
 * † Pistacia
 * † Pistacia marquezii – type locality for species
 * † Pitar
 * † Pitar amichel
 * † Pitar cantui
 * † Pitar helenae
 * † Pitar joaquinensis
 * † Pitar mendezensis
 * † Pitar sp.
 * † Pitarella
 * † Pitarella calceola – tentative report
 * † Pituophis – tentative report
 * † Pituophis sp.
 * † Placosmilia
 * † Placosmilia copoyensis – type locality for species
 * † Placosmilia copoyensis
 * † Placotrochus
 * † Placotrochus sp. – tentative report
 * † Placunanomia
 * † Placunanomia hannibali – type locality for species
 * † Placunanomia hannibali
 * † Plagioctenium
 * † Plagioctenium mendenhalli
 * † Plagionotus
 * † Plagionotus loveni – or unidentified comparable form
 * † Plaina
 * † Plaina sp.
 * † Planoxyopes – type locality for genus
 * † Planoxyopes eximius – type locality for species
 * † Platygonus – or unidentified comparable form
 * † Platygonus
 * † Platygonus compressus – tentative report
 * † Platygonus sp.
 * † Platyoptera
 * † Platyoptera pacifica – type locality for species
 * † Platyoptera pacifica
 * † Platytrochus
 * † Platytrochus dominicensis
 * † Plecia
 * † Plecia pristina – type locality for species
 * † Plecotus
 * † Plecotus tetralophodon
 * † Plectropsyche
 * † Plectropsyche alvarezi – type locality for species
 * † Plectropsyche alvarezi
 * † Plegadis – or unidentified comparable form
 * † Plegadis sp.
 * † Pleiolama
 * † Pleiolama vera
 * † Plesiocetus – or unidentified related form
 * † Plesiocetus
 * † Plesiocetus sp.
 * † Pleurofusia
 * † Pleurofusia collaris – tentative report
 * † Pleurofusia sp.
 * † Pleurofusia vicksburgensis – tentative report
 * † Pleurolira
 * † Pleurolira tenagos – tentative report
 * † Pleuroliria
 * † Pleuroliria sp.
 * † Pleurotoma
 * † Pleurotoma angermanni
 * † Pleurotoma inaudita
 * † Pleurotoma scaliae
 * † Pleurotoma veracruzana
 * † Pleurotoma zapoteca
 * † Pleurotomella
 * † Pleurotomella harbisonae
 * † Plicatula
 * † Plicatula densata
 * † Plicatula filamentosa – or unidentified related form
 * † Plicatula lalajensis
 * † Plicatula sp.
 * † Plicatula spondylopsis
 * † Plioceros
 * † Plioceros sp.
 * † Pliohippus
 * † Pliohippus potosinus – type locality for species
 * † Plionictis
 * † Plionictis oaxacaensis
 * † Plionycteris
 * † Plionycteris russelli
 * † Pliophenacomys
 * † Pliophenacomys wilsoni – type locality for species
 * † Pliophenacomys wilsoni
 * † Pocillopora
 * † Pocillopora capitata
 * † Pocillopora damicornis
 * † Pocillopora elegans – or unidentified comparable form
 * † Pocillopora elegans
 * † Pocillopora guadalupensis – type locality for species
 * † Pocillopora sp.
 * † Pocillopora verrucosa
 * † Podiceps
 * † Podiceps caspicus
 * † Podiceps parvus
 * † Podilymbus
 * † Podilymbus podiceps
 * † Pododesmus
 * † Pododesmus macrochisma
 * † Poebrotherium
 * † Poebrotherium sp.
 * † Poirieria
 * † Poirieria alaquaensis
 * † Poirieria dominicensis
 * † Poirieria septima – type locality for species
 * † Polinices
 * † Polinices alamedensis – tentative report
 * † Polinices bifasciatus – tentative report
 * † Polinices bifasciatus
 * † Polinices byramensis
 * † Polinices hornii
 * † Polinices humboldi
 * † Polinices lewisi – tentative report
 * † Polinices lewisi
 * † Polinices pinionensis
 * † Polinices saulae – type locality for species
 * † Polinices saulae
 * † Polinices simiensis
 * † Polinices sp.
 * † Polinices uber
 * † Polinicies
 * † Polinicies reclusianus
 * † Polyderis
 * † Polyderis antigua – type locality for species
 * † Polymesoda
 * † Polymesoda nicaraguana – or unidentified comparable form
 * † Polymesoda sp.
 * † Polynemoidea
 * † Polynemoidea mexicana – type locality for species
 * † Polystira
 * † Polystira barretti
 * † Polystira tenagos
 * † Pontoporia – or unidentified related form
 * † Pontoporia sp.
 * † Porites
 * † Porites astreoides
 * † Porites baracoaensis
 * † Porites douvillei
 * † Porites furcata
 * † Porites lobata
 * † Porites macdonaldi – tentative report
 * † Porites panamensis
 * † Porites porites
 * † Porites sp.
 * † Porites sverdrupi – or unidentified comparable form
 * † Porites sverdrupi
 * † Porites trinitatis
 * † Porosoma
 * † Porosoma fifei – type locality for species
 * † Porphyrio
 * † Porphyrio martinicus
 * † Portunus
 * † Portunus atecuicitlis – type locality for species
 * † Portunus atecuicitlis
 * † Porzana
 * † Porzana carolina
 * † Potamides – tentative report
 * † Potamides
 * † Potamides plicifera
 * † Potamides tricarinatus
 * † Potamocypris
 * † Potamocypris sp.
 * † Praekogia – type locality for genus
 * † Praekogia
 * † Praekogia cedrosensis – type locality for species
 * † Praekogia cedrosensis
 * † Praerhapydionina
 * † Praerhapydionina vanwessemi
 * † Prehepatus
 * † Prehepatus mexicanus
 * † Prionace
 * † Prionace glauca
 * † Priscoficus
 * † Priscoficus juvenis – tentative report
 * † Priscoficus sp.
 * † Priscoficus tritaria
 * † Proadusta
 * † Proadusta sp.
 * † Procamelus – or unidentified comparable form
 * † Procamelus sp.
 * † Proceratium
 * † Proceratium poinari
 * † Procolobostema – type locality for genus
 * † Procolobostema
 * † Procolobostema hurdi – type locality for species
 * † Procolobostema incisum – type locality for species
 * † Procolobostema obscurum – type locality for species
 * † Procyon
 * † Procyon lotor
 * † Procyon sp.
 * † Prodipodomys
 * † Prodipodomys idahoensis
 * † Prodipodomys sp.
 * † Profidia – type locality for genus
 * † Profidia nitida – type locality for species
 * † Prolimnocyon
 * † Prolimnocyon sp.
 * † Pronepos – type locality for genus
 * † Pronepos
 * † Pronepos exilis – type locality for species
 * † Pronepos fossilis – type locality for species
 * † Pronepos fossilis – tentative report
 * † Pronepos fossilis
 * † Propago – type locality for genus
 * † Propago debilis – type locality for species
 * † Proporocyclina
 * † Proporocyclina tobleri
 * † Propustularia
 * † Propustularia kemperae
 * † Propustularia simiensis – or unidentified comparable form
 * † Prorhinopsenius – type locality for genus
 * † Prorhinopsenius mexicanus – type locality for species
 * † Prosigmodon
 * † Prosigmodon chihuahuensis – type locality for species
 * † Prosigmodon chihuahuensis
 * † Prosigmodon ferrusquiai – type locality for species
 * † Prosigmodon oroscoi
 * † Prosocer – type locality for genus
 * † Prosocer mollis – type locality for species
 * † Prosthennops
 * † Prosthennops xiphodonticus – or unidentified comparable form
 * † Protocytherella
 * † Protocytherella karlana
 * † Protoglobicephala – type locality for genus
 * † Protoglobicephala mexicana – type locality for species
 * † Protolabis – or unidentified comparable form
 * † Protolabis sp.
 * † Protonema
 * † Protonema bartschi
 * † Protorcula
 * † Protorcula subpunctata
 * † Protoreodon
 * † Protoreodon petersoni
 * † Prototama – type locality for genus
 * † Prototama antiqua – type locality for species
 * † Prototama succinea – type locality for species
 * † Prototheca
 * † Prototheca tenerrima
 * † Protula
 * † Protula sp.
 * † Psammacoma
 * † Psammacoma acolasta
 * † Psammacoma gatunensis
 * † Psammacoma zapotalensis
 * † Psammocora
 * † Psammocora stellata
 * † Psammodulus
 * † Psammodulus mexicanus
 * † Psammotreta
 * † Psammotreta cognata – or unidentified comparable form
 * † Psammotreta cognata
 * † Psammotreta obesa – or unidentified comparable form
 * † Psammotreta obesa
 * † Psectrosciara
 * † Psectrosciara fossilis – type locality for species
 * † Pseudaelurus – tentative report
 * † Pseudaelurus
 * † Pseudaelurus intrepidus – tentative report
 * † Pseudaelurus sp.
 * † Pseudochama
 * † Pseudochama exogyra
 * † Pseudocylindrodon
 * † Pseudocylindrodon pintoensis – type locality for species
 * † Pseudodiploria
 * † Pseudodiploria strigosa
 * † Pseudoliva
 * † Pseudoliva carinata – tentative report
 * † Pseudoliva nana
 * † Pseudoliva santander
 * † Pseudoliva vetusta – tentative report
 * † Pseudomalaxis
 * † Pseudomalaxis sp.
 * † Pseudomelatoma
 * † Pseudomelatoma penicillata
 * † Pseudomelatoma torsa
 * † Pseudoparablastomeryx – tentative report
 * † Pseudoparablastomeryx sp.
 * † Pseudophragmina
 * † Pseudophragmina advena
 * † Pseudophragmina clarki
 * † Pseudophragmina sp.
 * † Pseudophragmina teres
 * † Pseudopusula
 * † Pseudopusula californiana
 * † Pseudorca
 * † Pseudorca crassidens
 * † Pseudotorinia
 * † Pseudotorinia euprepes
 * † Pseudotorinia nupera – or unidentified comparable form
 * † Pseudovermilla
 * † Pseudovermilla sp.
 * † Pseudozonaria
 * † Pseudozonaria annettae – or unidentified comparable form
 * † Pseudozonaria annettae
 * † Pseudozonaria arabicula
 * † Psychoda
 * † Psychoda rusti – type locality for species
 * † Psychoda sp.
 * † Psychoda tzotzili – type locality for species
 * † Psyllipsocus
 * † Psyllipsocus sp.
 * † Pteria
 * † Pteria limula
 * † Pteria sp.
 * † Pteria sterna
 * † Pterigocythereis
 * † Pterigocythereis americana
 * † Pteromylaeus
 * † Pteromylaeus sp.
 * † Pteropsella
 * † Pteropsella lapidosa
 * † Puffinus
 * † Puffinus sp.
 * † Puffinus tedfordi – type locality for species
 * † Puffinus tedfordi
 * † Puma
 * † Puma concolor
 * † Pupillaria
 * † Pupillaria parcipictus
 * † Purpura – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Purpura
 * † Purpura festiva
 * † Purpura nuttalli
 * † Purpura pansa
 * † Purpura sp. – type locality for species
 * † Pusula
 * † Pusula californiana
 * † Pusula radians
 * † Pusula solandri
 * † Pycnodonte
 * † Pycnodonte bajaensis
 * † Pycnodonte eldridgei – or unidentified comparable form
 * † Pycnodonte heermanni
 * † Pycnodonte loeli
 * † Pycnodonte pacifica – type locality for species
 * † Pycnodonte pacifica
 * † Pycnodonte verracruzana – type locality for species
 * † Pyramidella
 * † Pyramidella sp.
 * † Pyrene
 * † Pyrene fuscata
 * † Quinqueloculina
 * † Quinqueloculina sp.
 * † Quiscalus
 * † Quiscalus mexicanus
 * † Raadshoovenia
 * † Raadshoovenia guatemalensis
 * † Raadshovenia
 * † Raadshovenia guatemalensis
 * † Raeta
 * † Raeta gibbosa
 * † Raeta sp.
 * † Raeta undulata
 * † Rana
 * † Rana pipiens
 * † Rana sp.
 * † Ranina
 * † Ranina berglundi – type locality for species
 * † Ranina berglundi
 * † Raninoides
 * † Raninoides acanthocolus
 * † Raninoides mexicanus
 * † Raninoides proracanthus
 * † Raninoides sp.
 * † Rapana
 * † Rapana imperialis – type locality for species
 * † Rapana imperialis
 * † Rapana vaquerosensis
 * † Reithrodontomys
 * † Reithrodontomys fulvescens
 * † Reithrodontomys megalotis
 * † Reithrodontomys sp.
 * † Reticutriton
 * † Reticutriton lineatus
 * † Retusa
 * † Retusa tantilla
 * † Rhapidionina
 * † Rhapidionina limbata
 * † Rhaponeis
 * † Rhaponeis amphioceros
 * † Rhaponeis sachalinensis
 * † Rhapydionina
 * † Rhapydionina limbata
 * † Rhineura
 * † Rhineura sp.
 * † Rhinoclavis
 * † Rhinoclavis gemmata
 * † Rhinocoryne
 * † Rhinocoryne humboldti
 * † Rhinophrynus
 * † Rhinophrynus dorsalis
 * † Rhizangia
 * † Rhizangia sp.
 * † Rhizoprionodon
 * † Rhizoprionodon longurio
 * † Rhizoprionodon sp.
 * † Rhus
 * † Rhus sp.
 * † Rhus toxicodendroides – type locality for species
 * † Rhynchotherium – tentative report
 * † Rhynchotherium
 * † Rhynchotherium falconeri
 * † Rhynchotherium sp.
 * † Rimella
 * † Rimella sp.
 * † Rissoa
 * † Rissoa epulata – or unidentified comparable form
 * † Rissoa epulata
 * † Rissoella
 * † Rissoella excolpa
 * † Rissoella tumens
 * † Rissoina
 * † Rissoina catesbyana
 * † Rissoina cleo
 * † Rissoina sagraiana
 * † Rondeletia – tentative report
 * † Rondeletia sp.
 * † Rotularia
 * † Rotularia dickhauti
 * † Saccella
 * † Saccella fabalis – or unidentified comparable form
 * † Saccella taphria
 * † Saccostrea
 * † Saccostrea palmula
 * † Sachella
 * † Sachella taphria
 * † Salina
 * † Salina tristani – tentative report
 * † Sanguinolaria
 * † Sanguinolaria sp.
 * † Saniwa – or unidentified comparable form
 * † Saniwa sp.
 * † Sassia
 * † Sassia septemdentata
 * † Saxidomus
 * † Saxidomus nuttalli
 * † Saxidomus vaquerosensis – or unidentified comparable form
 * † Scalina
 * † Scalina escandoni
 * † Scalina retifera
 * † Scalina sp.
 * † Scalina trigintanaria
 * † Scaphander
 * † Scaphander costatus
 * † Scaphander sp. – tentative report
 * † Scaphander sp.
 * † Scaphokogia – or unidentified comparable form
 * † Scaphokogia sp.
 * † Scatopse
 * † Scatopse bilaminata – type locality for species
 * † Scatopse primula – type locality for species
 * † Scatopse primula
 * † Sceloporus
 * † Sceloporus sp.
 * † Sceloporus variabilis
 * † Scheloribates
 * † Scheloribates durhami – type locality for species
 * † Schizaster
 * † Schizaster sp.
 * † Schizaster subcylindricus
 * † Schizoporella
 * † Schizoporella cornuta
 * † Schizoporella japonica – or unidentified related form
 * † Schwenckfeldina
 * † Schwenckfeldina archoica – type locality for species
 * † Sciara
 * † Sciara sp.
 * † Scirtes
 * † Scirtes sp.
 * † Sciurus
 * † Sciurus alleni
 * † Scobinella – tentative report
 * † Scobinella
 * † Scobinella morierei
 * † Scobinella prionota
 * † Scobinella sp.
 * † Scolopocryptops
 * † Scolopocryptops simojovelensis – type locality for species
 * † Scolytonema
 * † Scolytonema mexicana – type locality for species
 * † Scomber
 * † Scomber sp.
 * † Sconsia
 * † Sconsia grayi
 * † Sconsia zacatensis
 * † Scutella
 * † Scutella andersoni
 * † Scutella norrisi
 * † Scutella sp. – tentative report
 * † Scylla
 * † Scylla costata
 * † Seila
 * † Seila montereyensis
 * † Seira
 * † Seira frater – tentative report
 * † Seira sp.
 * † Selenops
 * † Selenops sp.
 * Semele
 * † Semele decisa
 * † Semele flavescens
 * † Semele guaynasensis
 * † Semele jovis
 * † Semele perlamellosa
 * † Semele rupicola
 * † Semele sp.
 * † Semicassis
 * † Semicassis centiquadrata
 * † Semicosiphus
 * † Semicosiphus sp.
 * † Septifer
 * † Septifer bifurcatus
 * † Seraphs
 * † Seraphs sp.
 * † Serpula
 * † Serpula batequensis – type locality for species
 * † Serpulorbis
 * † Serpulorbis margaritacea
 * † Serpulorbis margaritaceus
 * † Serpulorbis sp.
 * † Siderastrea
 * † Siderastrea conferta – or unidentified comparable form
 * † Siderastrea conferta
 * † Siderastrea scotia
 * † Siderastrea siderea
 * † Sideroseris
 * † Sideroseris durhami
 * † Sigaretus
 * † Sigaretus mexicanus
 * † Sigmodon
 * † Sigmodon curtisi
 * † Sigmodon hispidus
 * † Sigmodon sp.
 * † Siliqua
 * † Siliqua lucida
 * † Siliqua patula
 * † Silis
 * † Silis chiapasensis – type locality for species
 * † Simaruba
 * † Simaruba veracruziana – type locality for species
 * † Simojovelhyus – type locality for genus
 * † Simojovelhyus pocitosense – type locality for species
 * † Simomactra
 * † Simomactra dolabriformis
 * † Sincola
 * † Sincola gibberula
 * † Sincola mexicana – type locality for species
 * † Sincola mexicana
 * † Sinezona
 * † Sinezona rimuloides
 * † Sinum
 * † Sinum mississippiense
 * † Sinum multiplicatus – or unidentified comparable form
 * † Sinum obliquum – or unidentified comparable form
 * † Sinum perspectivum
 * † Sinum sp.
 * † Siphocypraea
 * † Siphocypraea amandusi – type locality for species
 * † Siphocypraea amandusi
 * † Siphonochelus
 * † Siphonochelus curvirostratus
 * † Siphonochelus sawkinsi – or unidentified comparable form
 * † Smaragdia
 * † Smaragdia viridis
 * † Smilodon
 * † Smilodon fatalis – or unidentified comparable form
 * † Smilodon fatalis
 * † Smilodon sp.
 * † Socratea
 * † Socratea brownii
 * † Solariorbis
 * † Solariorbis boardmani
 * † Solecurtus
 * † Solecurtus cummingianus
 * † Solecurtus sp.
 * † Solen
 * † Solen rosaceus
 * † Solen sicarius
 * † Solen sp.
 * † Solena
 * † Solena novacularis
 * † Solena sp.
 * † Solenopsis
 * † Solenopsis sp.
 * † Solenosteira
 * † Solenosteira anomala
 * † Solenosteira macrospira
 * † Solenosteira pallida – or unidentified comparable form
 * † Spermophilus
 * † Spermophilus matachicensis – type locality for species
 * † Spermophilus matachicensis
 * † Spermophilus shotwelli
 * † Spermophilus sp.
 * † Spermophilus spilosoma
 * † Spermophilus variegatus
 * † Sphaerocypraea
 * † Sphaerocypraea wegeneri
 * † Sphaeroma
 * † Sphaeroma burkartii
 * † Sphyraena
 * † Sphyraena barracuda – or unidentified comparable form
 * † Sphyraena sp.
 * † Sphyrna
 * † Sphyrna lewini
 * † Sphyrna media
 * † Sphyrna mokarran
 * † Sphyrna sp.
 * † Sphyrna vespertina
 * † Sphyrna zygaena
 * † Spilogale
 * † Spilogale putorius
 * † Spiroglyphus
 * † Spiroglyphus lituella
 * † Spiroglyphus sp.
 * † Spirorbis
 * † Spirorbis leptostoma – or unidentified comparable form
 * † Spirorbis sp.
 * † Spondylus
 * † Spondylus batequensis – type locality for species
 * † Spondylus batequensis
 * † Spondylus calcifer
 * † Spondylus crassisquama
 * † Spondylus perrini
 * † Spondylus princeps – or unidentified related form
 * † Spondylus princeps
 * † Spondylus sp.
 * † Spongicythere
 * † Spongicythere sp.
 * † Squalus
 * † Squalus sp.
 * † Squatina
 * † Squatina sp.
 * † Standesia
 * † Standesia meadensis
 * † Stegomastodon – or unidentified comparable form
 * † Stegomastodon sp.
 * † Stenella – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Stenella
 * † Stenella attenuata – type locality for species
 * † Stenella attenuata
 * † Stenella sp.
 * † Stenocypris
 * † Stenocypris sp.
 * † Stenohebrus – type locality for genus
 * † Stenohebrus glaesarius – type locality for species
 * † Stenomylus
 * † Stenomylus tubutamensis – type locality for species
 * † Stenoplax
 * † Stenoplax conspicua
 * † Stenoplax magdalenensis
 * † Stenotabanus
 * † Stenotabanus oleariorum – type locality for species
 * † Stephanocyathus
 * † Stephanocyathus sp. – tentative report
 * † Stephanogonia
 * † Stephanogonia pretiosa
 * † Stephanopyxis
 * † Stephanopyxis sp.
 * † Stereolepis – or unidentified comparable form
 * † Stereolepis sp.
 * † Stichtoptychus
 * † Stichtoptychus mexambrus – type locality for species
 * † Stigmaulax
 * † Stigmaulax sulcata
 * † Stilpon
 * † Stilpon mexicanus – type locality for species
 * † Stoaplax
 * † Stoaplax nandachare
 * † Stockoceros
 * † Stockoceros conklingi
 * † Stockoceros sp.
 * † Stomatopora
 * † Stomatopora sp.
 * † Storrsella
 * † Storrsella haastersi
 * † Stramonita
 * † Stramonita biserealis
 * † Stramonita biserialis
 * † Stramonita haemostoma
 * † Striatolamia
 * † Striatolamia macrota
 * † Strigilla
 * † Strigilla interrupta
 * † Striostrea
 * † Striostrea appressa – or unidentified related form
 * † Striostrea cahobasensis – or unidentified comparable form
 * † Striostrea freudenbergi – type locality for species
 * † Strioterebrum
 * † Strioterebrum sp.
 * † Strioterebrum spiniferum
 * † Strioterebrum tantula – tentative report
 * † Strix
 * † Strix brea
 * † Strombina
 * † Strombina colinensis – or unidentified comparable form
 * † Strombina cyphonotus
 * † Strombina maculosa
 * † Strombina olssoni
 * † Strombina pulcherrima
 * † Strombus
 * † Strombus galeatus
 * † Strombus gracilior
 * † Strombus proximus – or unidentified comparable form
 * † Strombus pugilis
 * † Strombus sp. – type locality for species
 * † Strombus sp.
 * † Strongylocentrotus
 * † Strongylocentrotus franciscanus
 * † Strongylocentrotus purpuratus
 * † Strongylocentrotus sp.
 * † Strophocardia
 * † Strophocardia megastropha
 * † Strotarchus – type locality for genus
 * † Strotarchus paradoxus – type locality for species
 * † Sturnella – tentative report
 * † Sturnella sp.
 * † Stylemys
 * † Stylemys sp.
 * † Stylophora
 * † Stylophora cambridgensis – or unidentified comparable form
 * † Stylophora chaneyi
 * † Stylophora granulata
 * † Stylophora imperatoris
 * † Stylophora lindavistae – type locality for species
 * † Stylosmilia – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Stylosmilia ameliae
 * † Subcancilla
 * † Subcancilla ecuadoriana
 * † Subcancilla rhadina
 * † Succinarisemus
 * † Succinarisemus totolapensis – type locality for species
 * † Succinea
 * † Succinea sp.
 * † Sula
 * † Sula sp.
 * † Sulcobuccinum
 * † Sulcobuccinum howardi
 * † Sulcobuccinum scalina – or unidentified comparable form
 * † Sulcoretusa
 * † Sulcoretusa sulcata
 * † Supella
 * † Supella miocenica – type locality for species
 * † Surculites
 * † Surculites cabezai
 * † Surculites carpenteriana
 * † Sveltia
 * † Sveltia zahni
 * † Swammerdamella
 * † Swammerdamella prima – type locality for species
 * † Sylvilagus – or unidentified comparable form
 * † Sylvilagus
 * † Sylvilagus audubonii – or unidentified comparable form
 * † Sylvilagus audubonii
 * † Sylvilagus floridanus – or unidentified comparable form
 * † Sylvilagus leonensis
 * † Sylvilagus sp.
 * † Synaptomys
 * † Synaptomys cooperi
 * † Synthetoceras
 * † Synthetoceras sp.
 * † Synthliboramphus – tentative report
 * † Synthliboramphus
 * † Synthliboramphus sp.
 * † Syrrhophus
 * † Syrrhophus campi
 * † Syzygophyllia – tentative report
 * † Syzygophyllia sp.
 * † Tadarida
 * † Tadarida aurispinosa
 * † Tadarida brasiliensis
 * † Tadarida laticaudata
 * † Tadarida sp.
 * † Tagelus
 * † Tagelus californianus
 * † Tagelus plebeius
 * † Tagelus sp.
 * † Talityphis
 * † Talityphis carmenae – type locality for species
 * † Tamiosoma
 * † Tamiosoma gregaria
 * † Tamiosoma regalis
 * † Tanea
 * † Tanea lineata – or unidentified comparable form
 * † Tapinoma
 * † Tapinoma sp.
 * † Tapirus
 * † Tapirus sp.
 * † Taxidea
 * † Taxidea mexicana
 * † Taxidea sp.
 * † Taxidea taxus – or unidentified comparable form
 * † Tegula – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Tegula
 * † Tegula aureotincta
 * † Tegula brunnea – tentative report
 * † Tegula brunnea
 * † Tegula eiseni
 * † Tegula funebralis
 * † Tegula ligulata
 * † Tegula marcida
 * † Tegula mariana – or unidentified comparable form
 * † Tegula mariana
 * † Tegula montereyi
 * † Tegula pulligo
 * † Tegula rubroflammulata
 * † Tegula rugosa
 * † Tehuacana
 * † Tehuacana tehuacana
 * † Teinostoma
 * † Teinostoma bibbiana – or unidentified comparable form
 * † Teinostoma caronensis
 * † Teinostoma chipolanum
 * † Teinostoma invallata
 * † Teinostoma squiresi
 * † Teinostoma stemonium
 * † Teinostoma supravallata
 * † Teleoceras – or unidentified comparable form
 * † Teleoceras
 * † Teleoceras hicksi
 * † Teleoceras sp.
 * † Tellidora
 * † Tellidora burnetti
 * † Tellina – tentative report
 * † Tellina
 * † Tellina bodegensis
 * † Tellina cumingii
 * † Tellina jungi
 * † Tellina meropsis
 * † Tellina ochracea
 * † Tellina perrini
 * † Tellina santander
 * † Tellina sp.
 * † Telmatoscopus
 * † Telmatoscopus hurdi – type locality for species
 * † Tenagodus
 * † Tenagodus bajaensis – type locality for species
 * † Terebra
 * † Terebra armillata
 * † Terebra burckhardti – type locality for species
 * † Terebra burckhardti
 * † Terebra elata
 * † Terebra hemphilli
 * † Terebra isaacpetiti
 * † Terebra pedroana
 * † Terebra sp.
 * † Terebra strigata
 * † Terebra subsulcifera
 * † Terebra variegata – or unidentified comparable form
 * † Terebra variegata
 * † Terebratalia
 * † Terebratalia batequia – type locality for species
 * † Terebratalia transversia
 * † Terebratulina
 * † Terebratulina louisianae – or unidentified comparable form
 * † Teredo
 * † Teredo ringens – tentative report
 * † Termitaradus
 * † Termitaradus protera – type locality for species
 * † Tesserocerus
 * † Tesserocerus simojovelensis – type locality for species
 * † Testudo
 * † Testudo sp.
 * † Tetraclita
 * † Tetraclita sp.
 * † Tetraclita squamosa
 * † Tetrameryx
 * † Tetrameryx mooseri
 * † Tetrameryx sp.
 * † Tetrameryx tacubayensis
 * † Texmelanatria
 * † Texmelanatria angeloi
 * † Thais
 * † Thais emarginata
 * † Thais planospira
 * † Thais sp.
 * † Thais tecta – or unidentified comparable form
 * † Thais transcosana
 * † Thais wittichi – type locality for species
 * † Thais wittichi
 * † Thalassionema
 * † Thalassionema nitzchioides
 * † Thalassiothrix
 * † Thalassiothrix longissima
 * † Thalassoleon
 * † Thalassoleon mexicanus
 * † Thericium
 * † Thericium stercusmuscarum
 * † Thomomys – tentative report
 * † Thomomys
 * † Thomomys bottae
 * † Thomomys umbrinus – or unidentified comparable form
 * † Thomomys umbrinus
 * † Thracia
 * † Thracia curta
 * † Thracia sp.
 * † Threticus
 * † Threticus sp.
 * † Thunnus
 * † Thunnus sp.
 * † Thunnus thynnus – or unidentified comparable form
 * † Tigrisoma – tentative report
 * † Tigrisoma sp.
 * † Timoclea
 * † Timoclea picta
 * † Tiphyocetus – or unidentified related form
 * † Tiphyocetus
 * † Tiphyocetus sp.
 * † Tiphyocetus temblorensis
 * † Tityus
 * † Tityus apozonalli – type locality for species
 * † Tivela
 * † Tivela byronensis
 * † Tivela stultorum
 * † Tivella
 * † Tivella byronensis
 * † Tivella stultorum
 * † Tomarctus – or unidentified comparable form
 * † Tomarctus sp.
 * † Tonacatecutlius – type locality for genus
 * † Tonacatecutlius gibsoni – type locality for species
 * † Tonicella
 * † Tonicella lineata – or unidentified comparable form
 * † Tonna
 * † Tonna galea – or unidentified comparable form
 * † Tornatellaea
 * † Tornatellaea bella
 * † Tornatellaea cerralvensis
 * † Toxorhina
 * † Toxorhina sp.
 * † Toxorhynchites
 * † Toxorhynchites mexicanus – type locality for species
 * † Trachemys – or unidentified comparable form
 * † Trachemys
 * † Trachemys sp.
 * † Trachycardium
 * † Trachycardium consors
 * † Trachycardium procerum
 * † Trachycardium sp.
 * † Trachyleberidea
 * † Trachyleberidea blanpiedi
 * † Trachyphyllia
 * † Trachyphyllia batequensis – type locality for species
 * † Trachyphyllia sawkinsi
 * † Trajana
 * † Trajana veracruzana – type locality for species
 * † Tremarctos
 * † Tremarctos floridanus – or unidentified comparable form
 * † Tremarctos floridanus
 * † Trentepohlia
 * † Trentepohlia immemorata – type locality for species
 * † Trentepohlia mexicana – type locality for species
 * † Tresus
 * † Tresus nuttallii
 * † Triceratium
 * † Triceratium condecorum – or unidentified comparable form
 * † Trichiurus
 * † Trichiurus sp.
 * † Trichomyia
 * † Trichomyia antiquaria – type locality for species
 * † Trichomyia axeli – type locality for species
 * † Trichomyia declivivena – type locality for species
 * † Trichomyia discalis – type locality for species
 * † Trichomyia glomerosa – type locality for species
 * † Trichomyia mecocerca – type locality for species
 * † Trichomyia richardi – type locality for species
 * † Trichomyia smithi – type locality for species
 * † Trichomyia sp.
 * † Trichopsocus
 * † Trichopsocus maculosus – type locality for species
 * † Tricolia
 * † Tricolia pulloides
 * † Tricolia sp.
 * † Trigonias
 * † Trigonias sp.
 * † Trimusculus
 * † Trimusculus reticulata
 * † Triphora
 * † Triphora hemphilli
 * † Triphora pedroana – or unidentified comparable form
 * † Triplofusus
 * † Triplofusus princeps
 * † Tripsycha
 * † Tripsycha centiquadra
 * † Trochita
 * † Trochita aperta
 * † Trochita costellata
 * † Trochocyathus
 * † Trochocyathus mexicanum – type locality for species
 * † Trochocyathus mexicanum
 * † Trochoseris
 * † Trochoseris aperta – or unidentified comparable form
 * † Trochus
 * † Trochus sp.
 * † Trophon – tentative report
 * † Trophon
 * † Trophon belcheri
 * † Trophon isthmicus
 * † Trophon sp.
 * † Trophon triangulatus – or unidentified comparable form
 * † Truncatella
 * † Truncatella californica
 * † Truncatella guadalupensis
 * † Truncatella stimpsoni
 * † Tubastraea
 * † Tubastraea tenuilamellosa
 * † Tubulostium
 * † Tubulostium cortezi
 * † Tucetona
 * † Tucetona multicostata
 * † Turbinaria
 * † Turbinaria durhami – type locality for species
 * † Turbinella
 * † Turbinella falconensis
 * † Turbinella hermani – type locality for species
 * † Turbinella hermani
 * † Turbinolia
 * † Turbinolia dickersoni
 * † Turbo
 * † Turbo fluctuosa
 * † Turbo fluctuosus
 * † Turbo sp.
 * † Turbo squamiger
 * † Turbonilla
 * † Turbonilla almo
 * † Turbonilla aresta
 * † Turbonilla beatula
 * † Turbonilla buttoni
 * † Turbonilla sp.
 * † Turbonilla tenuicula
 * † Turricula
 * † Turricula maculosa
 * † Turricula sp.
 * † Turris
 * † Turris ostrearum – or unidentified comparable form
 * † Turritella – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Turritella
 * † Turritella abrupta
 * † Turritella acosta
 * † Turritella aguilerae
 * † Turritella altilira – or unidentified comparable form
 * † Turritella altilira
 * † Turritella anactor
 * † Turritella andersoni
 * † Turritella bosei – type locality for species
 * † Turritella bosei
 * † Turritella buwaldana
 * † Turritella ceibana
 * † Turritella cooperi
 * † Turritella cortezi
 * † Turritella gonostoma – or unidentified comparable form
 * † Turritella gonostoma
 * † Turritella guppyi
 * † Turritella humerosa
 * † Turritella imperialis
 * † Turritella inezana – or unidentified related form
 * † Turritella inezana – or unidentified comparable form
 * † Turritella inezana
 * † Turritella infragranulata
 * † Turritella lawsoni
 * † Turritella leucostoma
 * † Turritella marcosensis
 * † Turritella margaritana – or unidentified comparable form
 * † Turritella mariana
 * † Turritella multilira
 * † Turritella nasuta
 * † Turritella ocoyana – or unidentified related form
 * † Turritella ocoyana – or unidentified comparable form
 * † Turritella ocoyana
 * † Turritella pachecoensis – or unidentified comparable form
 * † Turritella pachecoensis
 * † Turritella peninsularis
 * † Turritella postmortoni
 * † Turritella reversa
 * † Turritella sanjuanensis
 * † Turritella sp. – type locality for species
 * † Turritella sp.
 * † Turritella subgrundifera – tentative report
 * † Turritella subgrundifera
 * † Turritella temblorensis
 * † Turritella tigrina
 * † Turritella tristis
 * † Turritella tuctepecensis
 * † Turritella tuxtepecensis
 * † Turritella uvasana – tentative report
 * † Turritella uvasana – or unidentified comparable form
 * † Turritella uvasana
 * † Turritella variata
 * † Turritella wittichi – type locality for species
 * † Turritriton
 * † Turritriton gibbosus
 * † Tursiops
 * † Tursiops truncatus
 * † Tuthillia
 * † Tuthillia danielburckhardti – type locality for species
 * † Typhinellus
 * † Typhinellus sowerbii
 * † Tyrannochthonius
 * † Tyrannochthonius sp.
 * † Undulostrea
 * † Undulostrea megodon
 * † Urocyon
 * † Urocyon cinereoargenteus
 * † Uromitra
 * † Uromitra vokesae
 * † Urosyca
 * † Urosyca caudata
 * † Ursus
 * † Ursus americanus
 * † Ursus sp.
 * † Vasum
 * † Vasum caestus
 * † Vasum haitensis
 * † Vasum muricatum – or unidentified comparable form
 * † Velates – report made of unidentified related form or using admittedly obsolete nomenclature
 * † Velates
 * † Velates batequensis – type locality for species
 * † Velates batequensis
 * † Velates perversus
 * † Velates vokesi
 * † Velutina
 * † Velutina velutina
 * † Venericardia
 * † Venericardia cacamai – type locality for species
 * † Venericardia carsonensis – or unidentified comparable form
 * † Venericardia densata – tentative report
 * † Venericardia densata
 * † Venericardia diga
 * † Venericardia elongata
 * † Venericardia francescae
 * † Venericardia planicosta
 * † Venericardia rotunda – or unidentified comparable form
 * † Venericardia sp.
 * † Venericardia vaughani
 * † Ventricolaria
 * † Ventricolaria harrisiana – or unidentified comparable form
 * † Ventricolaria harrisiana
 * † Vermetus
 * † Vermetus compactus – or unidentified comparable form
 * † Vermetus indentatus
 * † Vermetus pulcher
 * † Vermetus sp.
 * † Vermicularia
 * † Vermicularia spirata
 * † Vermicularia woodringi – or unidentified comparable form
 * † Verrucoides
 * † Verrucoides stenohedra
 * † Verticordia
 * † Verticordia agueguexquitensis
 * † Vesicomya
 * † Vesicomya vesica
 * † Veterator – type locality for genus
 * † Veterator
 * † Veterator extinctus – type locality for species
 * † Veterator sp.
 * † Vetus
 * † Vetus robustus – type locality for species
 * † Vetus robustus
 * † Viapinnixa
 * † Viapinnixa alvarezi
 * † Viapinnixa perrilliatae
 * † Viaplax
 * † Viaplax urpiniana
 * † Vitrinella
 * † Vitrinella obliquestriata
 * † Vitrinella oldroydi
 * † Vitrinella stearnsi
 * † Vitularia
 * † Vitularia salebrosa
 * † Viverravus – tentative report
 * † Viverravus sp.
 * † Vokesimurex
 * † Vokesimurex messorius
 * † Vokesimurex recurvirostris
 * † Vokesula
 * † Vokesula aldrichi
 * † Vokesula smithvillensis – tentative report
 * † Vokesula smithvillensis
 * † Volutilithes
 * † Volutilithes muricinus – or unidentified comparable form
 * † Volutilithes sp.
 * † Volvarina
 * † Volvarina taeniata
 * † Volvarina taeniolata
 * † Volvulella
 * † Volvulella garzai
 * † Volvulella oxytata
 * † Vulpes
 * † Vulpes sp.
 * † Vulpes stenognathus
 * † Vulutocorbis – tentative report
 * † Vulutocorbis wheelockensis – or unidentified comparable form
 * † Wyolestes
 * † Wyolestes iglesius – type locality for species
 * † Xancus
 * † Xancus wilsoni – tentative report
 * † Xancus wilsoni
 * † Xanthacrona
 * † Xanthacrona sp.
 * † Xanthichthys – or unidentified comparable form
 * † Xanthichthys sp.
 * † Xanthipyxis
 * † Xanthipyxis sp.
 * † Xanthocephalus
 * † Xanthocephalus xanthocephalus
 * † Xanthosia
 * † Xanthosia americana
 * † Xenophora
 * † Xenophora caribbaea
 * † Xenophora conchyliophora – or unidentified comparable form
 * † Xenophora conchyliophora
 * † Xenophora stocki
 * † Xenophora zitteli
 * † Xenosiren – type locality for genus
 * † Xenosiren yucateca – type locality for species
 * † Xestoleberis
 * † Xestoleberis vicksburgensis
 * † Xiphocentron
 * † Xiphocentron chiapasi – type locality for species
 * † Xiphocentron chiapasi
 * † Zalophus
 * † Zalophus californianus
 * † Ziphius
 * † Ziphius cavirostris
 * † Zirfaea
 * † Zirfaea pilsbryi – tentative report
 * † Zirfaea pilsbryi