List of the Paleozoic life of Texas

This list of the Paleozoic life of Texas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Texas and are between 538.8 and 252.17 million years of age.

A
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 * †Aboculus – type locality for genus
 * †Aboculus robustus – type locality for species
 * †Acanthocladia
 * †Acanthocladia americana
 * †Acanthocladia guadalupensis
 * †Acanthoclema
 * †Acanthocoryna
 * †Acanthocoryna stauroma
 * †Acanthocrania
 * †Acanthocrania alta – type locality for species
 * †Acanthocrania conferta – type locality for species
 * †Acanthocrania densispina – type locality for species
 * †Acanthocrania intermedia
 * †Acanthocrania magna
 * †Acanthocrania minutispinosa – type locality for species
 * †Acanthocrania platys – type locality for species
 * †Acanthocrania regularis
 * †Acanthocrania vasta – type locality for species
 * †Acanthopecten
 * †Acanthopecten carboniferus – or unidentified related form
 * †Acanthopecten coloradoensis
 * †Acanthopecten delawarensis – type locality for species
 * †Acanthoplecta
 * †Acanthoplecta inopinata – type locality for species
 * †Acanthorota – type locality for genus
 * †Acanthorota permiana – type locality for species
 * †Acanthoschizorota – type locality for genus
 * †Acanthoschizorota variabilis – type locality for species
 * Acheloma 12DB.jpg †[[Acheloma]] – type locality for genus
 * †Acheloma cumminsi – type locality for species
 * †Achistrum
 * †Achistrum brownwoodensis – type locality for species
 * †Achistrum ludwigi – type locality for species
 * †Achistrum monochordata
 * †Acolosia – type locality for genus
 * †Acolosia anomala – type locality for species
 * †Acolosia elliptica
 * †Acolosia exasperata
 * †Acolosia glabra
 * †Acolosia magna
 * †Acolosia recepta – type locality for species
 * †Acosarina
 * †Acosarina baylorensis – type locality for species
 * †Acosarina mesoplatys – type locality for species
 * †Acosarina minuta – type locality for species
 * †Acosarina peculiaris – type locality for species
 * †Acosarina rectimarginata
 * †Acritosia
 * †Acritosia magna
 * †Acritosia magnifica
 * †Acritosia peculiaris – type locality for species
 * †Acritosia silicica
 * †Acritosia solida
 * †Acritosia teguliferoides – type locality for species
 * †Acritosia vestibula
 * Acrodus nobilis Exhibit Museum of Natural History cropped.jpg †[[Acrodus]] – tentative report
 * †Acrodus olsoni – type locality for species
 * †Acrodus sweetlacruzensis – type locality for species
 * †Acrothele
 * †Actinocoelia
 * †Actinocoelia maeandrina
 * †Actinocoelia verrucosa – type locality for species
 * †Actinoconchus
 * †Actinohymen – type locality for genus
 * †Actinohymen russelli – type locality for species
 * †Actinophrentis
 * †Actinophrentis bonespringense – type locality for species
 * †Actinophrentis columnare – type locality for species
 * †Acutichiton
 * †Acutichiton pannuceus – type locality for species
 * †Acutichiton pyrmidalus
 * †Adamantina
 * †Adamantina foliacea
 * †Adlatipora – type locality for genus
 * †Adlatipora fossulata – type locality for species
 * †Adrianites – tentative report
 * †Agathiceras
 * †Agathiceras applini – type locality for species
 * †Agathiceras ciscoense – type locality for species
 * †Agathiceras contractum – type locality for species
 * †Agathiceras frechi – type locality for species
 * †Agathiceras girtyi – type locality for species
 * †Agathiceras uralicum
 * †Agelesia
 * †Agelesia triagonalis – type locality for species
 * †Agmoblastus
 * †Agmoblastus caddense – type locality for species
 * †Agnostocrinus
 * †Agnostocrinus ornatus – type locality for species
 * †Akmilleria
 * †Akmilleria adkinsi – type locality for species
 * †Akmilleria electraensis
 * †Akmilleria huecoensis – type locality for species
 * †Albaillella
 * †Albaillella foremanae – type locality for species
 * †Alegeinosaurus
 * Alethopteris PAMuseum.jpg †[[Alethopteris]]
 * †Alilepis
 * †Alisporites
 * †Alisporites plicatus – type locality for species
 * †Alisporites zapfei
 * †Allagecrinus
 * †Allagecrinus bassleri
 * †Allopiloceras
 * †Allorhynchus
 * †Allorhynchus circulare
 * †Allorhynchus concentricum
 * †Allorhynchus formulosum
 * †Allorhynchus permianum – type locality for species
 * †Allorhynchus triangulatum – type locality for species
 * †Allorhynchus variabile – type locality for species
 * †Allorhynchus venustulum
 * †Allorisma – tentative report
 * †Allorisma albequus
 * †Allorisma dubium – or unidentified related form
 * †Allotropiochisma
 * †Allotropiochisma flabellum – type locality for species
 * †Allotropiochisma texanum – type locality for species
 * †Allotropiochisma uddenitense – type locality for species
 * †Almites
 * †Almites sellardsi – type locality for species
 * †Altadema – type locality for genus
 * †Altadema convexa – type locality for species
 * †Altiplecus
 * †Altiplecus argutus
 * †Altiplecus cooperi
 * †Altiplecus deltosus
 * †Altiplecus extensus
 * †Altiplecus glebosus – type locality for species
 * †Altiplecus periosus
 * †Altiplecus trapezoidalis
 * †Altudoceras
 * †Altudoceras altudense – type locality for species
 * †Altudoceras cooperi – type locality for species
 * †Altudoceras serratum – type locality for species
 * †Alveus – type locality for genus
 * †Alveus depressus – type locality for species
 * †Amandophyllum
 * †Amaurotoma
 * †Amaurotoma subsinuata
 * †Amblysiphonella
 * †Ambozone
 * †Ambozone dictyonema
 * †Ametoria – type locality for genus
 * †Ametoria residua – type locality for species
 * †Ammovertella
 * †Amphicrinus
 * †Amphipella
 * †Amphipella arcaria
 * †Amphipella attenuata
 * †Amphiscapha
 * †Amphiscapha catilloides
 * †Amphiscapha dextrata – type locality for species
 * †Amphiscapha gigantea – type locality for species
 * †Amphiscapha muricata
 * †Amphiscapha subquadrata
 * †Amphissites
 * †Amphissites centronotus – or unidentified comparable form
 * †Amphissites knighti – type locality for species
 * †Amplexizaphrentis
 * †Amplexocarinia
 * †Amplexus – report made of unidentified related form or using admittedly obsolete nomenclature
 * Pectinidae - Amusium cristatum.JPG [[Amusium]] – tentative report
 * †Ananias
 * †Ananias appeli
 * †Ananias labrectus
 * †Ananias ootomaria – type locality for species
 * †Ananias permianus
 * †Ananias welleri
 * †Anatsabites
 * †Anatsabites multiliratus – type locality for species
 * †Anatsabites williamsi
 * †Anconochilus – type locality for genus
 * †Anconochilus barnesi – type locality for species
 * †Anemonaria
 * †Anemonaria sublaevis – type locality for species
 * †Aneuthelasma
 * †Aneuthelasma amygdalinum
 * †Angelosaurus – type locality for genus
 * †Angelosaurus dolani – type locality for species
 * †Angelosaurus greeni – type locality for species
 * †Angyomphalus
 * †Anisodexis
 * †Anisopyge – type locality for genus
 * †Anisopyge cooperi – type locality for species
 * †Anisopyge perannulata – type locality for species
 * Annularia Stellata.jpg †[[Annularia]]
 * †Annularia maxima
 * †Annularia spicata
 * †Annularia stellata – or unidentified comparable form
 * †Annuliconcha
 * †Annuliconcha dentata
 * †Annuliconcha interlineata
 * †Anodontacanthus
 * †Anodontacanthus americanus
 * †Anomalesia
 * †Anomalesia perplexa
 * †Anomaloria
 * †Anomaloria anomala
 * †Anomphalus
 * †Anomphalus studiosus – type locality for species
 * †Anomphalus umbilicatus – or unidentified comparable form
 * †Anomphalus verruculiferus
 * †Anopliopsis
 * †Anopliopsis subcarinata
 * †Anoptychia
 * †Anteridocus – type locality for genus
 * †Anteridocus bicostatus
 * †Anteridocus erugatus
 * †Anteridocus eximius
 * †Anteridocus gongylus – type locality for species
 * †Anteridocus paucicostatus – type locality for species
 * †Anteridocus seminudus
 * †Anteridocus subcarinatus
 * †Anteridocus swallovianus – type locality for species
 * †Anteridocus triangulatus
 * †Anthracopupa
 * †Anthracopupa ohioensis
 * †Anthracosycon
 * †Anthracosycon auriforme – type locality for species
 * †Anthracosycon ficus
 * †Anthracosycon regulare
 * †Antiquatonia
 * †Antiquatonia inflativentra
 * †Antiquatonia portlockianus
 * †Antronaria – type locality for genus
 * †Antronaria dissona – type locality for species
 * †Antronaria emarginata
 * †Antronaria indentata
 * †Antronaria mesicostalis – type locality for species
 * †Antronaria pluricosta
 * †Antronaria specialis
 * †Antronaria speciosa – type locality for species
 * †Antronaria spectabilis
 * †Antronaria titania
 * †Antronaria transversa
 * †Antronaria voluminosa – type locality for species
 * †Apachella
 * †Apachella capertoni – type locality for species
 * †Apachella exaggerata
 * †Apachella franciscana
 * †Apachella glabra – type locality for species
 * †Apachella huecoensis – type locality for species
 * †Apachella nodosa
 * †Apachella powwowensis – type locality for species
 * †Apachella prodontia
 * †Apachella pseudostrigillata
 * †Apachella texana – type locality for species
 * †Apachella translirata
 * †Apachella turbiniformis
 * †Apatokephalus
 * †Apatokephalus serratus
 * †Aphaurosia
 * †Aphaurosia rotundata
 * †Aphaurosia scutata
 * †Aphelaspis
 * Cameroceras trentonese.jpg †[[Aphetoceras]]
 * †Aphlebia
 * †Apographiocrinus
 * †Apographiocrinus arcuatus – or unidentified comparable form
 * †Apographiocrinus raderi – type locality for species
 * †Apographiocrinus typicalis
 * †Apotocardium
 * †Apotocardium cordatum – type locality for species
 * †Apotocardium obliquum
 * †Apsisaurus – type locality for genus
 * †Apsisaurus witteri – type locality for species
 * †Apsotreta
 * †Apsotreta expansa
 * †Apterrinella – tentative report
 * †Araeonema
 * †Araeonema virgatum
 * Araeoscelis.jpg †[[Araeoscelis]] – type locality for genus
 * †Araeoscelis casei
 * †Araeoscelis gracilis – type locality for species
 * †Araucarites
 * †Araxathyris – or unidentified comparable form
 * †Arceodomus
 * †Arceodomus prolata – type locality for species
 * †Archaeocidaris
 * †Archaeocidaris brownwoodensis – type locality for species
 * †Archaeocidaris cratis
 * †Archaeocycas
 * †Archaeocycas whitei
 * Archaeolithophyllum
 * †Archaeolithoporella
 * †Archaeoscyphia
 * †Archaeoscyphia annulata
 * Archeria BW.jpg †[[Archeria (animal)|Archeria]] – type locality for genus
 * †Archeria crassidisca – type locality for species
 * †Archimedes
 * †Arcochiton
 * †Arcochiton raymondi
 * †Arcuolimbus
 * †Arcuolimbus convexus
 * †Arionthia – type locality for genus
 * †Arionthia alata
 * †Arionthia blothrhachis – type locality for species
 * †Arionthia germana – type locality for species
 * †Arionthia lamaria
 * †Arionthia polypleura
 * †Aristoceras
 * †Aristoceras appressum
 * †Armenoceras
 * †Armenoceras australe
 * †Arrectocrinus
 * †Arrectocrinus major – type locality for species
 * †Arrectocrinus texanus – type locality for species
 * †Artinskia
 * †Artinskia artiensis
 * †Artinskia lilianae – type locality for species
 * †Artisia
 * †Asaphellus
 * †Aspidiopsis
 * †Aspidosaurus – type locality for genus
 * †Aspidosaurus binasser – type locality for species
 * †Aspidosaurus chiton – type locality for species
 * †Aspidosaurus glascocki – type locality for species
 * †Aspidosaurus peltatus – type locality for species
 * †Assimulia
 * †Assimulia abscessa – type locality for species
 * †Assimulia arta – type locality for species
 * †Assimulia compacta – type locality for species
 * †Assimulia flexibilis – type locality for species
 * †Assimulia fracta – type locality for species
 * †Assimulia frequentis – type locality for species
 * †Assimulia recrea – type locality for species
 * †Assimulia tergida – type locality for species
 * †Assimulia uddenitense – type locality for species
 * †Astartella
 * †Astartella concentrica
 * †Astartella nasuta
 * †Astartella subquadrata
 * †Astegosia
 * †Astegosia subquadrata
 * †Atelestegastus
 * †Atelestegastus marginatus
 * †Athlocrinus
 * †Athyris
 * †Athyris bradyensis – type locality for species
 * †Attenuatella
 * †Attenuatella texana
 * †Aulopora – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Aulosteges
 * †Aurikirkbya
 * †Aurikirkbya auriformis – type locality for species
 * †Aurikirkbya barbarae – type locality for species
 * †Aurikirkbya wordensis – type locality for species
 * †Austinella
 * †Austinella kankakensis
 * †Australosutura
 * †Australosutura llanoensis
 * Aviculopecten subcardiformis01.JPG †[[Aviculopecten]]
 * †Aviculopecten ballingerana
 * †Aviculopecten girtyi – type locality for species
 * †Aviculopecten gryphus – type locality for species
 * †Aviculopecten herzeri
 * †Aviculopecten occidentalis
 * †Aviculopecten sumnerensis
 * †Aviculopecten texanus
 * †Aviculopinna
 * †Avonia
 * †Avonia honeycreekensis – type locality for species
 * †Avonia latidorsata
 * †Avonia meekana
 * †Avonia pustulifera – or unidentified comparable form
 * †Avonia signata
 * †Avonia subhorrida
 * †Avonia walcottiana

B

 * †Babylonites – type locality for genus
 * †Babylonites acutus – type locality for species
 * †Babylonites carinatus – type locality for species
 * †Babylonites conicus – type locality for species
 * †Babylonites turritus – type locality for species
 * †Bactrites
 * †Bactrites elcapitanensis
 * †Baiosoma
 * †Baiosoma pala – type locality for species
 * Bairdia
 * †Bairdia guadalupiana – type locality for species
 * †Bairdia permiana – type locality for species
 * †Bairdia plebeia – or unidentified related form
 * †Bairdia pruniseminata – type locality for species
 * †Bairdia rhomboidalis – type locality for species
 * †Bairdia subfusiformis – type locality for species
 * †Bairdia wordensis – type locality for species
 * †Bakevellia
 * †Balkoceras – type locality for genus
 * †Balkoceras gracile – type locality for species
 * †Bamberina
 * †Bamberina annectens
 * †Bamyaniceras
 * †Bamyaniceras knighti
 * †Bamyaniceras simile
 * †Barbclabornia
 * †Barbclabornia luedersensis – type locality for species
 * †Barnesoceras – type locality for genus
 * †Barnesoceras clavatum – type locality for species
 * †Barnesoceras conosiphonatum – type locality for species
 * †Barnesoceras expansum – type locality for species
 * †Barnesoceras lamellosum – type locality for species
 * †Barnesoceras lentiexpansum – type locality for species
 * †Barnesoceras percurvatum – type locality for species
 * †Barnesoceras transversum – type locality for species
 * †Bathyglyptus – type locality for genus
 * †Bathyglyptus theodori – type locality for species
 * †Bathymyonia
 * †Bathymyonia nevadensis
 * †Bathyurellus
 * †Baylea
 * †Baylea delawarensis – type locality for species
 * †Baylea huecoensis – type locality for species
 * †Baylea knighti
 * †Baylea kuesi – type locality for species
 * †Baylea subconstricta
 * †Baylea supercrenata – or unidentified comparable form
 * †Baylea vjatkensis
 * †Beecheria
 * †Beecheria chouteauensis
 * †Beecheria elliptica
 * †Beecheria expansa
 * Bellerophon umbilicalis.jpg]] †Bellerophon'' – tentative report
 * †Bellerophon
 * †Bellerophon complanatus – type locality for species
 * †Bellerophon deflectus
 * †Bellerophon graphicus
 * †Bellerophon hilli – type locality for species
 * †Bellerophon huecoensis – type locality for species
 * †Bellerophon kingorum – type locality for species
 * †Bellerophon majusculus
 * †Bellerophon parvicristus – type locality for species
 * †Bellerophor
 * †Belodella
 * †Belodella silurica
 * †Belodella striata – or unidentified comparable form
 * †Beltella
 * †Bembexia
 * †Biarmeaspira
 * †Biarmeaspira multilineata
 * †Bicuerda
 * †Bicuerda columnare – type locality for species
 * †Bighornia
 * †Bighornia patella – or unidentified comparable form
 * †Bitaunioceras
 * †Bitaunioceras texanum – type locality for species
 * †Blountia
 * †Blountia assimilis
 * †Blountia ovata
 * †Blountiella
 * †Blountina
 * †Blountina westoni – or unidentified related form
 * †Boesites
 * †Boesites kingi – type locality for species
 * †Boesites scotti – type locality for species
 * †Boesites texanus – type locality for species
 * Bolosaurus.jpg †[[Bolosaurus]] – type locality for genus
 * †Bolosaurus major – type locality for species
 * †Bolosaurus striatus – type locality for species
 * †Borestus
 * †Borestus magdalenensis – type locality for species
 * †Borestus texanus – type locality for species
 * †Bothrionia – type locality for genus
 * †Bothrionia guadalupensis
 * †Bothrionia nasuta – type locality for species
 * †Bothrionia pulchra
 * †Bothrionia transversa – type locality for species
 * †Bothrostegium – type locality for genus
 * †Bothrostegium compactum – type locality for species
 * †Bothrostegium derbyoideum
 * †Bothrostegium pusillum
 * †Boultonia
 * †Boultonia guadalupensis – type locality for species
 * †Bowmanites
 * Brachydectes.jpg  †[[Brachydectes]]
 * †Brachydectes elongatus
 * †Brachydegma
 * †Brachydegma caelatum
 * †Brachymetopus – tentative report
 * †Brachymetopus rhinorhachis – type locality for species
 * †Brachyphyllum – tentative report
 * †Brachyphyllum densum – type locality for species
 * †Brachythyris
 * †Brachythyris chouteauensis
 * †Bradyphyllum
 * †Bradyphyllum coagmentum – type locality for species
 * †Bradyphyllum counterseptatum – type locality for species
 * †Bradyphyllum postwannense – type locality for species
 * †Branneroceras
 * †Branneroceras branneri
 * †Brochidium
 * †Brochidium morrisi – type locality for species
 * Broiliellus olsoni.jpg †[[Broiliellus]] – type locality for genus
 * †Broiliellus arroyoensis – type locality for species
 * †Broiliellus brevis – type locality for species
 * †Broiliellus olsoni – type locality for species
 * †Broiliellus peltatus – type locality for species
 * †Broiliellus texensis – type locality for species
 * †Bryograptus
 * †Bryorhynchus
 * †Bryorhynchus bisulcatum – type locality for species
 * †Bryorhynchus gratiosum – type locality for species
 * †Bryorhynchus nitidum
 * †Bryorhynchus plicatum
 * †Bucanopsis
 * †Bucanopsis type locality for species – informal
 * †Buekkella
 * †Buekkella digitata – type locality for species
 * †Burenoceras
 * †Burenoceras cornucopia – type locality for species
 * †Burenoceras muricoides – type locality for species
 * †Burenoceras phragmoceroides – type locality for species
 * Bythocypris
 * †Byzantia – type locality for genus
 * †Byzantia obliqua – type locality for species

C

 * Cacops1DB.jpg †[[Cacops]]
 * †Cacops aspidephorus – type locality for species
 * †Cactosteges – type locality for genus
 * †Cactosteges anomalus – type locality for species
 * †Calamites
 * †Calamites undulatus
 * †Calapoecia
 * †Calapoecia ungava – or unidentified comparable form
 * †Calathium
 * †Calcivertella
 * †Calclamnella
 * †Calclyra
 * †Calclyra eiseliana
 * †Calclyra spathulata – type locality for species
 * †Calclyra spinata – type locality for species
 * †Calclyra triangulata – type locality for species
 * †Calliprotonia
 * Callipteridium fossil cropped.png †[[Callipteridium]]
 * †Callipteridium pteridium – or unidentified comparable form
 * †Callipteridium virginianum
 * †Callipteris
 * †Callipteris conferta
 * †Callipteris flabellifera
 * †Callispirina
 * †Callispirina rotunda
 * †Callistadia – type locality for genus
 * †Callistadia bella – type locality for species
 * †Callitomaria
 * †Callitomaria magna – type locality for species
 * †Callitomaria stanislavi
 * †Calophyllum – tentative report
 * †Calycocoelia
 * †Calycocoelia typicalis
 * †Camarelasma
 * †Camarelasma neali
 * †Camarophorella
 * †Camarophorella dorsata – type locality for species
 * †Camarophorina – tentative report
 * †Camarotoechia
 * †Campophyllum – tentative report
 * †Campophyllum texanum – type locality for species
 * †Camptochiton – type locality for genus
 * †Camptochiton squarrosus – type locality for species
 * †Camptonectes – tentative report
 * †Cancrinella
 * †Cancrinella boonensis – tentative report
 * †Cancrinella parva
 * †Cancrinella planumbona
 * †Cancrinella sparsispinosa
 * †Cancrinella subquadrata – type locality for species
 * †Caneyella
 * †Caneyella wapanuckensis
 * †Capillomesolobus
 * †Capillomesolobus permianus
 * †Captorhinikos
 * †Captorhinikos chozaensis – type locality for species
 * †Captorhinikos valensis
 * †Captorhinoides – type locality for genus
 * †Captorhinoides valensis – type locality for species
 * Captorhinus BW.jpg †[[Captorhinus]] – type locality for genus
 * †Captorhinus aguti – type locality for species
 * †Captorhinus laticeps – type locality for species
 * †Carbonicola
 * †Carbonocoryphe
 * †Carbonocoryphe depressa
 * †Carbonocoryphe planucauda
 * †Cardiella
 * †Cardiella electraensis
 * †Cardiella ganti
 * †Cardiella sulcata – type locality for species
 * Cardiocephalus peabodyi.jpg †[[Cardiocephalus]] – type locality for genus
 * †Cardiocephalus sternbergi – type locality for species
 * †Cardiomorpha
 * †Carphites – type locality for genus
 * †Carphites diabloensis – type locality for species
 * †Carphites plectus
 * †Carpolithes
 * †Carrolla – type locality for genus
 * †Carrolla craddocki – type locality for species
 * †Cartorhium – type locality for genus
 * †Cartorhium chelomatum – type locality for species
 * †Cartorhium coristum
 * †Cartorhium latum – type locality for species
 * †Cartorhium mexicanum – type locality for species
 * †Cartorhium orbiculatum
 * †Cartorhium retusum
 * †Cartorhium vidriense – type locality for species
 * †Cartorhium zoyei – type locality for species
 * Casea_BW.jpg †[[Casea]] – type locality for genus
 * †Casea broilii – type locality for species
 * †Casea halselli – type locality for species
 * †Casea nicholsi – type locality for species
 * †Caseoides – type locality for genus
 * †Caseoides sanangeloensis – type locality for species
 * †Caseopsis
 * †Caseopsis agilis – type locality for species
 * †Cassianoides – type locality for genus
 * †Cassianoides kingorum – type locality for species
 * †Cassiavellia – type locality for genus
 * †Cassiavellia galtarae – type locality for species
 * Museum Mensch und Natur - catenipora.jpg †[[Catenipora]]
 * †Catenipora workmanae – type locality for species
 * †Catenispongia – type locality for genus
 * †Catenispongia agaricus – type locality for species
 * †Cathaysiopteris
 * †Cathaysiopteris yochelsonii – type locality for species
 * †Catoraphiceras
 * †Cavellina
 * †Cavellina ellipticalis – type locality for species
 * †Cavellina nebrascensis
 * Cedaria minor CRF.jpg †[[Cedaria]]
 * †Cedaria gaspensis – or unidentified comparable form
 * †Cenorhynchia – type locality for genus
 * †Cenorhynchia atmeta
 * †Cenorhynchia camerata
 * †Cenorhynchia fracida – type locality for species
 * †Cenorhynchia hebata
 * †Cenorhynchia mitigata
 * †Cenorhynchia nasuta
 * †Cenorhynchia parvula – type locality for species
 * †Cenorhynchia pentagonalis
 * †Cenorhynchia saginata – type locality for species
 * †Cenorhynchia transversa
 * †Cenorhynchia triangulata – type locality for species
 * †Cenorhynchia ventricosa
 * †Centrotarphyceras
 * †Centrotarphyceras longicameratum
 * †Ceratobairdia – type locality for genus
 * †Ceratobairdia dorsospinosa – type locality for species
 * †Ceratopea
 * †Ceratopea capuliformis
 * †Ceratopea hami – or unidentified comparable form
 * †Ceratopea incurvata
 * †Ceratopea lemonei – type locality for species
 * †Ceratopea unguis – or unidentified comparable form
 * †Ceraunocochlis
 * †Ceraunocochlis deformis – type locality for species
 * †Ceraunocochlis elongata – type locality for species
 * †Ceraunocochlis kidderi
 * †Ceraunocochlis trekensis – type locality for species
 * †Chaeniorhynchus – type locality for genus
 * †Chaeniorhynchus inauris
 * †Chaeniorhynchus salutare
 * †Chaeniorhynchus transversum – type locality for species
 * †Chaenomya – tentative report
 * †Chaetetes
 * †Chaetetes mackrothii – tentative report
 * ChancelloriaEros-Detail NaturhistorischesMuseum Nov14-10.jpg †[[Chancelloria]] – tentative report
 * †Chauliochiton – type locality for genus
 * †Chauliochiton knighti – type locality for species
 * †Chaunactis
 * †Cheiropyge
 * †Cheiropyge koizumii – or unidentified comparable form
 * †Chelononia
 * †Chelononia neali
 * †Chelononia straminea – type locality for species
 * †Chiastocolumnia – type locality for genus
 * †Chiastocolumnia cylindrica – type locality for species
 * †Choanodus – type locality for genus
 * †Choanodus anomalus
 * †Choanodus irregularis – type locality for species
 * †Choanodus perfectus – type locality for species
 * †Choctawites
 * †Choctawites choctawensis
 * †Choctawites cumminsi
 * †Chondronia – type locality for genus
 * †Chondronia bella – type locality for species
 * †Chondronia ningula – type locality for species
 * †Chondronia obesa
 * †Chondronia ovalis – type locality for species
 * †Chondronia parva
 * †Chondronia rectimarginata
 * †Chonetella
 * †Chonetella flemingi
 * †Chonetes
 * †Chonetes flemingi – tentative report
 * †Chonetes permianus
 * †Chonetes verneuilianus
 * †Chonetinella
 * †Chonetinella biplicata
 * †Chonetinella ciboloensis
 * †Chonetinella crassiparva
 * †Chonetinella gerontica
 * †Chonetinella parva
 * †Chonetinella spinolirata – type locality for species
 * †Chonetinetes
 * †Chonetinetes angustisulcatus
 * †Chonetinetes reversus – type locality for species
 * †Chonetinetes varians
 * †Chonosteges
 * †Chonosteges costellatus – type locality for species
 * †Chonosteges limbatus
 * †Chonosteges magnicostatus – type locality for species
 * †Chonosteges matutinus
 * †Chonosteges multicostatus
 * †Chonosteges pulcher
 * †Chonosteges variabilis – type locality for species
 * †Cibecuia
 * †Cibecuia gouldii – type locality for species
 * †Cibolites – type locality for genus
 * †Cibolites uddeni – type locality for species
 * †Cibolocrinus – type locality for genus
 * †Cibolocrinus erectus – type locality for species
 * †Cibolocrinus typus – type locality for species
 * †Cinclidonema – type locality for genus
 * †Cinclidonema texanum – type locality for species
 * †Cladopora – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Cladopora spinulata
 * †Cladopora tubulata
 * †Clarkoceras
 * †Clarkoceras luthei – or unidentified related form
 * †Clavallus
 * †Clavallus spicaudina
 * †Cleidophorus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Cleidophorus delawarensis
 * Cleiothyridina sublamellosa pedunculate valve.jpg †[[Cleiothyridina]]
 * †Cleiothyridina mulsa
 * †Cleiothyridina nana
 * †Cleiothyridina pilularis
 * †Cleiothyridina prouti – or unidentified comparable form
 * †Cleiothyridina rara
 * †Cleiothyridina rectimarginata – type locality for species
 * †Cleiothyridina tenuilineata
 * †Clelandoceras – tentative report
 * †Clelandoceras rarum – type locality for species
 * †Climacograptus
 * †Climacograptus nevadensis
 * †Climacograptus tubuliferus
 * †Clinodomia
 * †Clinodomia obstipa
 * †Clinolobus
 * †Clinolobus type locality for species – informal
 * †Clinopistha – tentative report
 * †Clinopistha levis – or unidentified comparable form
 * †Clistoceras
 * †Clitendoceras
 * †Clonograptus
 * †Cluthoceras
 * †Coccoseris
 * †Coccoseris astomata – type locality for species
 * †Codonofusiella
 * †Codonofusiella paradoxica
 * †Coelocladia
 * †Coelocladia spinosa
 * †Coelocladiella – type locality for genus
 * †Coelocladiella lissa
 * †Coelocladiella philoconcha – type locality for species
 * †Coelogasteroceras
 * †Coelogasteroceras mexicanum
 * †Coenocystis – type locality for genus
 * †Coenocystis richardsoni – type locality for species
 * †Coledium
 * †Coledium altisulcatum – type locality for species
 * †Coledium costatulum – type locality for species
 * †Coledium evexum
 * †Coledium undulatum
 * †Coledium vadosulcatum – type locality for species
 * †Collatipora – type locality for genus
 * †Collatipora delicata
 * †Collatipora discreta – type locality for species
 * †Collatipora pyriformis
 * †Collemataria – type locality for genus
 * †Collemataria americana
 * †Collemataria batilliformis
 * †Collemataria elongata – type locality for species
 * †Collemataria gregaria – type locality for species
 * †Collemataria irregularis – type locality for species
 * †Collemataria marshalli
 * †Collemataria platys – type locality for species
 * †Collemataria spatulata
 * †Collumatus
 * †Collumatus solitarius
 * †Colospongia
 * †Colospongia americana
 * †Colospongia benjamini
 * †Colospongiella – type locality for genus
 * †Colospongiella permiana – type locality for species
 * †Colpites
 * †Colpites minutus
 * †Colpites monilifera
 * †Colpites striata
 * †Comia
 * †Complexisporites – type locality for genus
 * †Complexisporites polymorphus – type locality for species
 * Compositafossil.jpg †[[Composita]]
 * †Composita affinis
 * †Composita apheles – type locality for species
 * †Composita apsidata
 * †Composita bucculenta – type locality for species
 * †Composita costata
 * †Composita cracens
 * †Composita crassa – type locality for species
 * †Composita discina
 * †Composita emarginata
 * †Composita enormis – type locality for species
 * †Composita imbricata – type locality for species
 * †Composita mexicana
 * †Composita mira
 * †Composita nucella
 * †Composita ovata
 * †Composita parasulcata – type locality for species
 * †Composita persinuata
 * †Composita pilula
 * †Composita prospera
 * †Composita pyriformis
 * †Composita quantilla
 * †Composita stalagmium
 * †Composita strongyle – type locality for species
 * †Composita subcircularis
 * †Composita subtilita
 * †Compressoproductus
 * †Compressoproductus acuminatus
 * †Compressoproductus concentricus
 * †Compressoproductus curtus – type locality for species
 * †Compressoproductus flabellatus
 * †Compressoproductus parvus
 * †Compressoproductus pinniformis
 * †Compressoproductus rarus – type locality for species
 * †Compressoproductus thomasi – type locality for species
 * †Condrathyris
 * †Condrathyris perplexa
 * †Conjunctio
 * †Conocardium – tentative report
 * †Conocerina
 * †Conocerina brevis – or unidentified comparable form
 * †Conocerina unguloides – type locality for species
 * †Cooleyella
 * †Cooleyella amazonensis
 * †Cooleyella duffini – type locality for species
 * †Cooperaria – type locality for genus
 * †Cooperaria getawayensis – type locality for species
 * †Coopericus
 * †Coopericus angustus – type locality for species
 * †Coopericus semisulcatus
 * †Coopericus undatus
 * †Cooperina
 * †Cooperina inexpectata
 * †Cooperina parva – type locality for species
 * †Cooperina subcuneata
 * †Cooperina triangulata
 * †Cooperoceras – type locality for genus
 * †Cooperoceras texanum – type locality for species
 * †Coosella
 * †Coosella beltensis
 * †Coosella granulosa
 * †Coosella widnerensis – or unidentified comparable form
 * †Coosia
 * †Coosia pernamagna
 * Cordaites fossil cropped.png †[[Cordaites]]
 * †Cordaites principalis
 * †Coronakirkbya – type locality for genus
 * †Coronakirkbya fimbriata – type locality for species
 * †Coryellina
 * †Coryellina indicata – type locality for species
 * †Coryssochiton – type locality for genus
 * †Coryssochiton parallelus – type locality for species
 * †Coscinophora – type locality for genus
 * †Coscinophora hortoni
 * †Coscinophora magnifica – type locality for species
 * †Coscinophora monilifera – type locality for species
 * †Coscinophora nodosa – type locality for species
 * †Costatumulus
 * †Costatumulus distortus
 * †Costatumulus expansa – type locality for species
 * †Costatumulus fragosa
 * †Costatumulus villiersi
 * †Costellarina – type locality for genus
 * †Costellarina costellata – type locality for species
 * †Costiferina
 * †Costiferina indica
 * †Costispinifera
 * †Costispinifera costata – type locality for species
 * †Costispinifera rugatula
 * †Costispinifera walcottiana
 * †Cotteroceras
 * CotylorhynchusDB2.jpg †[[Cotylorhynchus]]
 * †Cotylorhynchus hancocki – type locality for species
 * †Cranaena
 * †Cranaena dorsisulcata – type locality for species
 * †Cranaena hannibalensis – or unidentified comparable form
 * †Cranaena texana – type locality for species
 * Crania
 * †Crania permiana – type locality for species
 * †Craspedona
 * †Craspedona limbata – type locality for species
 * †Craspedona newelli
 * †Crassumbo – type locality for genus
 * †Crassumbo inornatus – type locality for species
 * †Crassumbo turgidus – type locality for species
 * †Cravenoceras – tentative report
 * †Crenispirifer
 * †Crenispirifer angulatus – type locality for species
 * †Crenispirifer effrenus
 * †Crenispirifer jubatus
 * †Crenispirifer myllus
 * †Crenispirifer sagus
 * †Crenulites – type locality for genus
 * †Crenulites duncanae – type locality for species
 * †Crenulites magnus – type locality for species
 * Cricotus heteroclitus Cope.jpg †[[Cricotus]]
 * †Cricotus crassidiscus – type locality for species
 * †Crimites
 * †Crimites glomulus – tentative report
 * †Crimites type locality for species – informal
 * †Cromyocrinus
 * †Cromyocrinus grandis – or unidentified comparable form
 * †Crossotelos
 * †Crossotelos annulatus
 * †Cruricella
 * †Cruricella minutalis – type locality for species
 * †Crurithyris
 * †Crurithyris inflata
 * †Crurithyris longirostris
 * †Crurithyris major
 * †Crurithyris parva
 * †Crurithyris planoconvexa
 * †Crurithyris sulcata
 * †Cryptacanthia
 * †Cryptacanthia glabra
 * †Ctenacanthus
 * †Ctenacanthus amblyxiphias – type locality for species
 * †Ctenalosia – type locality for genus
 * †Ctenalosia fixata – type locality for species
 * †Ctenalosia primitiva
 * †Ctenalosia rotunda
 * †Ctenoptychius
 * †Ctenospondylus – type locality for genus
 * †Ctenospondylus casei – type locality for species
 * †Cullisonia
 * †Cullisonia producta
 * †Culmitzschia
 * †Culunama
 * †Culunama bellistiata
 * †Cuniculocystis – type locality for genus
 * †Cuniculocystis floweri – type locality for species
 * †Cupularostrum – tentative report
 * †Cyathophylloides
 * †Cyathophylloides burksae – type locality for species
 * †Cycadospadix
 * †Cyclacantharia
 * †Cyclacantharia gigantea
 * †Cyclacantharia kingorum – type locality for species
 * †Cyclacantharia paucispinosa – type locality for species
 * †Cyclacantharia robusta
 * †Cyclacantharia transitoria – type locality for species
 * †Cyclites
 * †Cyclites costatus – type locality for species
 * †Cyclites multilineata – type locality for species
 * †Cyclobathmus
 * †Cyclobathmus haworthi
 * †Cylicioscapha
 * †Cylicioscapha texana – type locality for species
 * †Cylicioscapha williamsi – type locality for species
 * †Cylindritopsis
 * †Cylindritopsis hamiltonae – type locality for species
 * †Cylindritopsis insolitus
 * †Cylindritopsis spheroides – type locality for species
 * †Cylindritopsis vaningeni
 * †Cymatospira
 * †Cymatospira montfortianus
 * †Cyphotalosia – type locality for genus
 * †Cyphotalosia masonensis – type locality for species
 * †Cypricardinia – tentative report
 * †Cypricardinia contracta – type locality for species
 * †Cyptendoceras
 * †Cyptendoceras richardsoni – type locality for species
 * †Cyrtina
 * †Cyrtina burlingtonensis
 * †Cyrtorostra
 * †Cyrtorostra varicostata
 * †Cystothalamia – type locality for genus
 * †Cystothalamia guadalupensis – type locality for species
 * †Cystothalamia megacysta
 * †Cystothalamia nodulifera

D

 * †Dactylites
 * †Dactylites magna – type locality for species
 * †Dactylites micropora – type locality for species
 * †Dactylites obconica – type locality for species
 * †Dactylites subdigitatus – type locality for species
 * Dadoxylon-chalala.jpg †[[Dadoxylon]]
 * †Daharella
 * †Daharella crassa – type locality for species
 * †Daharella pattersonia – type locality for species
 * †Daharella ramosa
 * †Daixites
 * †Daixites meglitskyi – or unidentified comparable form
 * †Dakeoceras – tentative report
 * †Dakeoceras mutabile – type locality for species
 * †Danaeites
 * †Dapsilodus
 * †Dapsilodus obliquicostatus
 * †Dapsilodus praecipuus
 * †Dapsilodus sparsus
 * †Daraelites
 * †Daraelites leonardensis – type locality for species
 * Dasyceps bucklandi.jpg †[[Dasyceps]]
 * †Dasyceps microphthalmus – type locality for species
 * †Dasysaria
 * †Dasysaria inca
 * †Dasysaria undulata
 * †Dasysaria wolfcampensis – type locality for species
 * †Dateroceras
 * †Daubreeia
 * †Decoriconus
 * †Decoriconus fragilis
 * †Defordia
 * †Defordia defuncta
 * †Defordia densa – type locality for species
 * †Defordia lobata
 * †Deiracephalus
 * †Deiracephalus aster
 * †Delaria
 * †Delaria antiqua
 * †Delaria brevis – type locality for species
 * †Delaria chinatiensis – type locality for species
 * †Delaria granti – type locality for species
 * †Delaria westexensis – type locality for species
 * †Delnortea
 * †Delnortea abbotiae
 * †Delnortea abbottiae
 * †Delocrinus
 * †Delocrinus hemisphericus
 * †Delocrinus pictus
 * †Delocrinus subhemisphericus
 * †Deltarina
 * †Deltarina magnicostata
 * †Deltopecten
 * †Demarezites
 * †Dendropupa
 * †Dendropupa vetusta
 * †Densonella
 * Dentalium
 * †Derbyia
 * †Derbyia bella
 * †Derbyia bennetti – or unidentified comparable form
 * †Derbyia buchi
 * †Derbyia carteri
 * †Derbyia cincinnata – type locality for species
 * †Derbyia ciscoensis – tentative report
 * †Derbyia complicata – type locality for species
 * †Derbyia crassa
 * †Derbyia crenulata
 * †Derbyia cymbula
 * †Derbyia elevata
 * †Derbyia filosa – type locality for species
 * †Derbyia informis – type locality for species
 * †Derbyia laqueata – type locality for species
 * †Derbyia multistriata – tentative report
 * †Derbyia nasuta
 * †Derbyia pannucia – type locality for species
 * †Derbyia profunda
 * †Derbyia scitula
 * †Derbyia strophomenoidea
 * †Derbyia sulcata
 * †Derbyia texta – type locality for species
 * †Derbyia wabaunseensis – tentative report
 * †Derbyoides
 * †Derbyoides dunbari
 * †Derbyoides marathonensis
 * †Dermospheroidalis – type locality for genus
 * †Dermospheroidalis irregularis – type locality for species
 * †Desmoinsea
 * †Diaboloceras
 * †Diaboloceras varicostatum
 * Diadectes1DB.jpg †[[Diadectes]] – type locality for genus
 * †Diadectes sideropelicus – type locality for species
 * †Diadectes tenuitectes – type locality for species
 * †Diaphelasma
 * †Diaphelasma oklahomense
 * †Dibunophyllum
 * †Dibunophyllum moorei
 * †Dibunophyllum uddeni – type locality for species
 * †Dicellograptus
 * †Dicellograptus ornatus
 * †Diceromyonia
 * †Diceromyonia crassa – type locality for species
 * †Dichostasia
 * †Dichostasia complex – type locality for species
 * †Dichostasia simplex – type locality for species
 * †Dicksonites
 * †Dicranophyllum
 * †Dictyoclostus
 * †Dictyoclostus semireticulatus – tentative report
 * †Dictyotomaria
 * †Dictyotomaria euglyphea – type locality for species
 * †Dictyotomaria scitula
 * †Dictyotomaria type locality for species – informal
 * †Didymodus
 * †Didymodus platypternus
 * †Dielasma
 * †Dielasma adamanteum – type locality for species
 * †Dielasma anterolatum
 * †Dielasma bellulum
 * †Dielasma bovidens
 * †Dielasma compactum – type locality for species
 * †Dielasma cordatum – type locality for species
 * †Dielasma diabloense
 * †Dielasma ellipsoideum – type locality for species
 * †Dielasma emarginatum – type locality for species
 * †Dielasma expansum – type locality for species
 * †Dielasma gracile – type locality for species
 * †Dielasma hessense
 * †Dielasma labiatum
 * †Dielasma ligonorum
 * †Dielasma longisulcatum
 * †Dielasma microrhynchum
 * †Dielasma obesum – type locality for species
 * †Dielasma perplexum – type locality for species
 * †Dielasma pictile
 * †Dielasma planidorsatum – type locality for species
 * †Dielasma prolongatum
 * †Dielasma pygmaeum
 * †Dielasma rigbyi
 * †Dielasma shafterense – type locality for species
 * †Dielasma spatulatum
 * †Dielasma subcirculare
 * †Dielasma subcylindricum
 * †Dielasma sulcatum – type locality for species
 * †Dielasma uniplicatum
 * †Dielasma zebratum – type locality for species
 * †Dielasmella
 * †Dielasmella larga – type locality for species
 * †Diffingia – type locality for genus
 * †Diffingia coita – type locality for species
 * †Diffingia collecticia – type locality for species
 * †Diffingia divisa – type locality for species
 * †Diffingia largifica
 * †Diffingia tortuosa – type locality for species
 * †Diffingia valida – type locality for species
 * †Dimacrodon – type locality for genus
 * †Dimacrodon hottoni – type locality for species
 * †Dimetrodon – type locality for genus
 * †Dimetrodon angelensis – type locality for species
 * †Dimetrodon booneorum – type locality for species
 * †Dimetrodon dollovianus – type locality for species
 * †Dimetrodon gigashomogenes – type locality for species
 * †Dimetrodon grandis – type locality for species
 * †Dimetrodon kempae – type locality for species
 * †Dimetrodon limbatus – type locality for species
 * †Dimetrodon loomisi – type locality for species
 * †Dimetrodon macrospondylus – type locality for species
 * †Dimetrodon milleri – type locality for species
 * †Dimetrodon natalis – type locality for species
 * †Dioonitocarpidium
 * †Diplanus
 * †Diplanus apochordus
 * †Diplanus catatonus – type locality for species
 * †Diplanus lamellatus – type locality for species
 * †Diplanus rarus
 * †Diplanus redactus
 * Exhibit Museum of Natural History, Ann Arbor - IMG 9136.JPG †[[Diplocaulus]] – type locality for genus
 * †Diplocaulus brevirostris – type locality for species
 * †Diplocaulus copei – type locality for species
 * †Diplocaulus magnicornis – type locality for species
 * †Diplocaulus primus
 * †Diplocaulus recurvatus – type locality for species
 * †Diploconula
 * †Diploconula biconvexa – type locality for species
 * †Diplothmema
 * †Diraphora
 * †Discinites
 * †Discotomaria
 * †Discotomaria basisulcata – type locality for species
 * †Discotomaria costata
 * †Discotomaria dubia – type locality for species
 * †Discotomaria nodosa – type locality for species
 * †Discotropis – type locality for genus
 * †Discotropis girtyi – type locality for species
 * †Discotropis publicus
 * †Discotropis sulcifer
 * Dissorophus multicinctus cropped.jpg  †[[Dissorophus]] – type locality for genus
 * †Dissorophus multicinctus – type locality for species
 * †Ditomopyge
 * †Ditomopyge decurtata
 * †Ditomopyge scitula
 * †Divaricosta
 * †Divaricosta squarrosa – type locality for species
 * †Divaricosta vagabunda
 * †Djemelia – tentative report
 * †Docoderma – type locality for genus
 * †Docoderma papillosum – type locality for species
 * †Docoderma rigida
 * †Domatoceras
 * †Domatoceras texanum – type locality for species
 * †Donaldina
 * †Donaldina gracilis – type locality for species
 * †Donaldina knighti – type locality for species
 * †Donaldina robusta
 * †Donaldina stevensana
 * †Donaldina type locality for species – informal
 * †Donaldospira
 * †Donaldospira nodosa – type locality for species
 * †Donezella
 * †Driveria – type locality for genus
 * †Driveria ponderosa – type locality for species
 * †Dunbarites
 * †Dunbarites boardmani – type locality for species
 * †Dunbarites rectilaterale
 * †Durhamina
 * †Durhamina cordillerensis – type locality for species
 * †Dvorakia
 * †Dvorakia philipi – tentative report
 * †Dyoros
 * †Dyoros angulatus – type locality for species
 * †Dyoros attenuatus
 * †Dyoros auriculatus
 * †Dyoros complanatus
 * †Dyoros concavus – type locality for species
 * †Dyoros consanguineus – type locality for species
 * †Dyoros convexus
 * †Dyoros endospinus – type locality for species
 * †Dyoros extensiformis – type locality for species
 * †Dyoros extensus – type locality for species
 * †Dyoros giganteus
 * †Dyoros hillanus
 * †Dyoros intrepidus
 * †Dyoros lateralis
 * †Dyoros magnus
 * †Dyoros parvus – type locality for species
 * †Dyoros planiextensus – type locality for species
 * †Dyoros planus
 * †Dyoros quadrangulatus – type locality for species
 * †Dyoros rectangulatus – type locality for species
 * †Dyoros robustus
 * †Dyoros solidus – type locality for species
 * †Dyoros strigosus – type locality for species
 * †Dyoros subliratus
 * †Dyoros subquadratus
 * †Dyoros tenuis – type locality for species
 * †Dyoros tetragonus
 * †Dyoros transversus – type locality for species
 * †Dyoros vagabundus – type locality for species
 * †Dyoros vulgaris
 * †Dyoros wordensis – type locality for species
 * †Dysoristus
 * †Dysoristus lochmanae

E

 * †Echinaria
 * †Echinaria moorei
 * †Echinaria semipunctatus – tentative report
 * †Echinauris
 * †Echinauris bella – type locality for species
 * †Echinauris boulei
 * †Echinauris circularis
 * †Echinauris crassa
 * †Echinauris interrupta
 * †Echinauris irregularis – type locality for species
 * †Echinauris lappacea – type locality for species
 * †Echinauris lateralis
 * †Echinauris liumbona – type locality for species
 * †Echinauris parva – type locality for species
 * †Echinauris productelloides
 * †Echinauris subquadrata – type locality for species
 * †Echinauris venustula
 * †Echinosteges
 * †Echinosteges guadalupensis – type locality for species
 * †Echinosteges tuberculatus – type locality for species
 * †Economolopsis
 * †Economolopsis anodontoides
 * †Ectenoceras
 * †Ectenolites
 * †Ectenolites primus – type locality for species
 * †Ectochoristites
 * †Ectochoristites inflatus – type locality for species
 * †Ectoposia – type locality for genus
 * †Ectoposia grandis
 * †Ectoposia wildei – type locality for species
 * †Ectosteorachis
 * †Ectosteorachis nitidus
 * †Ectosterohachis
 * †Ectosterohachis nitidus
 * Edaphosaurus pogonias.jpg †[[Edaphosaurus]] – type locality for genus
 * †Edaphosaurus boanerges
 * †Edaphosaurus cruciger – or unidentified related form
 * †Edaphosaurus microdus
 * †Edaphosaurus pogonias – type locality for species
 * †Edestus
 * †Edestus minor
 * †Edmondia
 * †Edmondia bellula – type locality for species
 * †Edmondia glabra
 * †Edmondia rotunda – type locality for species
 * †Edmondia suborbiculata – tentative report
 * Edops craigi12DB.jpg †[[Edops]]
 * †Edops craigi
 * †Edriosteges – type locality for genus
 * †Edriosteges beedei – type locality for species
 * †Edriosteges compactus
 * †Edriosteges medlicottianus
 * †Edriosteges multispinosus – type locality for species
 * †Edriosteges tenuispinosus – type locality for species
 * †Eirlysia
 * †Eirlysia exquisita – type locality for species
 * †Eirlysia nodosa – type locality for species
 * †Eirlysia reticulata
 * †Elassonia
 * †Elassonia micraria
 * †Elassonia petila
 * †Elassonia scitula
 * †Elibatocrinus
 * †Eliva
 * †Eliva inflata
 * †Eliva shumardi
 * †Elivina
 * †Elivina compacta – type locality for species
 * †Elivina detecta
 * †Elivina sulcifer
 * †Ellesmeroceras
 * †Elliottella
 * †Elliottella minima
 * †Elliottella multicostata
 * †Elliottella transversalis
 * †Elliottella varicostata – type locality for species
 * †Elliptechinus – type locality for genus
 * †Elliptechinus kiwiaster – type locality for species
 * †Elversella – type locality for genus
 * †Elversella rugosa
 * †Elyx – tentative report
 * †Emilites
 * †Emilites brownwoodi – type locality for species
 * †Emilites incertum
 * †Emilites incertus – type locality for species
 * †Empedias
 * †Empedias molaris
 * †Enallosia
 * †Enallosia rotundovata
 * †Endelocrinus
 * †Endelocrinus grafordensis
 * †Endelocrinus tumidus
 * Endoceras.JPG †[[Endoceras]]
 * †Endoceras baylorense
 * †Endolobus
 * †Endolobus renfroae – type locality for species
 * †Endoplegma
 * †Endoplegma calathus
 * †Endothyra
 * †Enteletes
 * †Enteletes angulatus – type locality for species
 * †Enteletes costellatus
 * †Enteletes densus
 * †Enteletes dumblei – type locality for species
 * †Enteletes exiguus
 * †Enteletes globosus – type locality for species
 * †Enteletes hemiplicata
 * †Enteletes leonardensis
 * †Enteletes liumbonus – type locality for species
 * †Enteletes plummeri – type locality for species
 * †Enteletes rotundobesus – type locality for species
 * †Enteletes stehlii – type locality for species
 * †Enteletes subcircularis
 * †Enteletes subnudus
 * †Enteletes wolfcampensis
 * †Enteletes wordensis
 * †Eoasianites
 * †Eoasianites smithwickensis
 * †Eoasianites subhanieli
 * †Eoastarte
 * †Eoastarte subcircularis
 * †Eocamptonectes
 * †Eocamptonectes asperatus
 * †Eocamptonectes papillatus
 * †Eocamptonectes sculptilis
 * Eocaudina
 * †Eocaudina marginata
 * †Eocaudina mccormacki
 * †Eocaudina septaforaminalis
 * †Eocaudina subhexagona
 * †Eochonetes
 * †Eochonetes magna – type locality for species
 * †Eochonetes mucronata – type locality for species
 * †Eolyttonia
 * †Eolyttonia catilla
 * †Eolyttonia chaotica – type locality for species
 * †Eolyttonia circularis – type locality for species
 * †Eolyttonia cornucopia
 * †Eolyttonia diabloensis
 * †Eolyttonia fredericksi – type locality for species
 * †Eolyttonia gigantea – type locality for species
 * †Eolyttonia parviconica
 * †Eolyttonia phialiforma
 * †Eolyttonia pocillata – type locality for species
 * †Eolyttonia progressa – type locality for species
 * †Eomartiniopsis
 * †Eomartiniopsis girtyi
 * †Eopteria
 * †Eopteria richardsoni
 * †Eoschistoceras – type locality for genus
 * †Eoschistoceras strawnense – type locality for species
 * †Eosyodon – type locality for genus
 * †Eosyodon hudsoni – type locality for species
 * †Eothalassoceras – tentative report
 * †Eothinites
 * †Eothinites hessensis – type locality for species
 * †Eothinites planulatus
 * Eothyris cropped.jpg †[[Eothyris]] – type locality for genus
 * †Eothyris parkeyi – type locality for species
 * †Eotiaris
 * †Eotiaris connorsi – type locality for species
 * †Eotiaris guadalupensis – type locality for species
 * †Eowellerites
 * †Eowellerites moorei – type locality for species
 * †Ephippioceras
 * †Ephippioceras inexpectans – type locality for species
 * †Ephippioceras moinellae
 * †Epiactinotrypa
 * †Epiactinotrypa sera – type locality for species
 * †Epimastopora
 * †Epiphyton
 * †Epithalassoceras
 * †Epithalassoceras type locality for species – informal
 * †Eridmatus
 * †Eridmatus marathonensis – type locality for species
 * †Eridmatus texanus
 * †Erisocrinus
 * †Erisocrinus propinquus – type locality for species
 * †Erisocrinus trinodus – type locality for species
 * †Ernestiodendron
 * Eryops1DB.jpg †[[Eryops]] – type locality for genus
 * †Eryops anatinus – type locality for species
 * †Eryops kayi – type locality for species
 * †Eryops megacephalus – type locality for species
 * †Estheria
 * †Etheridgella
 * †Etheridgella porosa – type locality for species
 * †Etoblattina
 * †Etoblattina robusta – type locality for species
 * †Etoblattina texana – type locality for species
 * †Euchondria
 * †Euchondria cooperi – type locality for species
 * †Euconia – type locality for genus
 * †Euconia conicus
 * †Euconia etna
 * †Euconia umbilicata
 * †Euconospira
 * †Euconospira obsoleta – type locality for species
 * †Euconospira pulchra – type locality for species
 * †Euconospira spiroperforata – type locality for species
 * †Euconospira varizona
 * †Eugonophyllum
 * †Eugonophyllum huecoensis
 * †Eugonophyllum johnsonii
 * †Eumedlicottia
 * †Eumedlicottia burckhardti – type locality for species
 * †Eumedlicottia whitneyi – type locality for species
 * †Eumorphoceras
 * †Eumorphoceras bisulcatum
 * Euomphalus fossil cropped.png †[[Euomphalus]]
 * †Euomphalus cornudanus – type locality for species
 * †Euomphalus glabribasis
 * †Euomphalus kaibabensis
 * †Euomphalus levicarinatus – type locality for species
 * †Euomphalus pernodosus
 * †Euonychocrinus
 * †Euonychocrinus subservire – type locality for species
 * †Euphemites
 * †Euphemites aequisulcatus
 * †Euphemites batteni – type locality for species
 * †Euphemites blaneyanus
 * †Euphemites circumcostatus
 * †Euphemites crenulatus – type locality for species
 * †Euphemites exquisitus – type locality for species
 * †Euphemites imperator – type locality for species
 * †Euphemites kingi – type locality for species
 * †Euphemites luxuriosus – type locality for species
 * †Euphemites nodocarinatus
 * †Euphemites sparciliratus – type locality for species
 * †Euphemites vittatus
 * †Euphemitopsis
 * †Euphemitopsis multinodosa – type locality for species
 * †Euphemitopsis paucinodosus
 * †Eupleuroceras
 * †Eupleuroceras bellulum
 * †Eurylepidoides – type locality for genus
 * †Eurylepidoides socialis – type locality for species
 * †Euryodus – type locality for genus
 * †Euryodus primus – type locality for species
 * †Euryphyllum – tentative report
 * †Euryphyllum profundum – type locality for species
 * †Euryphyllum robustum – type locality for species
 * †Evolsonia
 * †Exaulipora
 * †Exaulipora permica
 * †Exovasa – type locality for genus
 * †Exovasa cystauletoides – type locality for species

F

 * †Falsiamplexus – type locality for genus
 * †Falsiamplexus delicata
 * †Falsiamplexus elongatus – type locality for species
 * †Falsiamplexus flexibilis – type locality for species
 * †Falsiamplexus reductus – type locality for species
 * †Fascicosta
 * †Fascicosta bella
 * †Fascicosta elongata
 * †Fascicosta longaeva
 * †Fayettevillea
 * †Fenestella
 * †Fenestella amplia
 * †Fenestella archimediformis
 * †Fenestella capitanensis
 * †Fenestella firmior
 * †Fenestella girtyi
 * †Fenestella guadalupensis – type locality for species
 * †Fenestella hilli
 * †Fenestella popeana
 * †Fenestella schucherti – or unidentified comparable form
 * †Fenestella spinulifera
 * †Fenestella texana – type locality for species
 * †Fenestrellina
 * †Ferganispira
 * †Ferganispira acteonina – type locality for species
 * †Fimbrinia
 * †Fimbrinia cristatotuberculata
 * †Fimbrinia ovata
 * †Fimbrinia plummeri
 * †Finkelnburgia
 * †Finkelnburgia crassicostellata – or unidentified comparable form
 * †Finkelnburgia cullisonia – or unidentified comparable form
 * †Fissispongia
 * †Fissispongia jacksboroensis
 * †Fistulipora
 * †Fistulipora guadalupae – type locality for species
 * †Fistulipora guadalupensis
 * †Flexuospiculata – type locality for genus
 * †Flexuospiculata hexactina – type locality for species
 * †Foordiceras
 * †Foordiceras mammiferum – type locality for species
 * †Foordiceras ornatissimum – type locality for species
 * †Fransonia
 * †Fransonia wyomingensis
 * †Fusella
 * †Fusella llanoensis – type locality for species
 * †Fusiella
 * Fusulinid limestone, Upper Pennsylvanian; Elk County KS.jpg †Fusulina – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Fusulina elongata – type locality for species

G

 * †Gasconadia
 * †Gasconadia putilla
 * †Gastrioceras
 * †Gastrioceras montgomeryense
 * †Gastrioceras occidentale
 * †Geinitzina
 * †Genevievella
 * †Genevievella spinox
 * †Geniculifera
 * †Geniculifera brevicula – type locality for species
 * †Geragnostus
 * Gerobatrachus NT.jpg †[[Gerobatrachus]] – type locality for genus
 * †Gerobatrachus hottoni – type locality for species
 * †Gervillia – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Gervillia longa
 * †Geyerella
 * †Geyerella americana – type locality for species
 * †Geyerella hessi – type locality for species
 * †Geyerella inexpectata – type locality for species
 * †Geyerella kingorum
 * †Gigantonoclea
 * †Gigantopteris
 * †Gigantopteris americana
 * †Girtycoelia
 * †Girtycoelia typica
 * †Girtyella
 * †Girtyella cedarensis – or unidentified related form
 * †Girtyoceras
 * †Girtyoceras hamiltonense
 * †Girtyoceras meslerianum
 * †Girtyocoelia
 * †Girtyocoelia beedei
 * †Girtypecten
 * †Girtypecten sublaqueatus
 * †Girtypora
 * †Girtypora constricta – type locality for species
 * †Girtypora hillana – type locality for species
 * †Girtypora ocellata
 * †Girtypora terminalis
 * †Girtypora vittata
 * †Girtyporina
 * †Girtyporina incrustans – type locality for species
 * †Girtyspira
 * †Girtyspira minuta
 * †Girtyspira yodai – type locality for species
 * †Girvanella
 * †Glabrocingulum
 * †Glabrocingulum alveozonum
 * †Glabrocingulum coronatum
 * †Glabrocingulum diablo
 * †Glabrocingulum grayvillense
 * †Glabrocingulum lupus
 * †Glabrocingulum texanum – type locality for species
 * †Glaphyrites
 * †Glaphyrites angulatus
 * †Glaphyrites anguloumbilicatus
 * †Glaphyrites deciensis – type locality for species
 * †Glaphyrites hyattianus
 * †Glaphyrites kansasensis
 * †Glaphyrites millsi
 * †Glaphyrites modestus – type locality for species
 * †Glaphyrites raymondi
 * †Glaphyrites ruzencevi
 * †Glaphyrites welleri
 * †Glassoceras
 * †Glassoceras normani – type locality for species
 * †Glaucosaurus – type locality for genus
 * †Glaucosaurus megalops – type locality for species
 * Glikmanius1DB.jpg †[[Glikmanius]]
 * †Glikmanius occidentalis
 * †Globivalvulina
 * †Glossothyropsis
 * †Glossothyropsis carinata
 * †Glossothyropsis cryptacanthoides
 * †Glossothyropsis immatura
 * †Glossothyropsis juvenis
 * †Glossothyropsis polita
 * †Glossothyropsis rectangulata – type locality for species
 * †Glossothyropsis robusta
 * †Glossothyropsis sinuata
 * †Glossothyropsis superba – type locality for species
 * †Gloverilima
 * †Gloverilima pratti
 * †Glyptagnostus
 * †Glyptorthis
 * †Glyptorthis maquoketensis
 * †Glyptospira
 * †Glyptospira cingulata – type locality for species
 * †Glyptospira huecoensis – type locality for species
 * †Glyptospira quadriserrata – type locality for species
 * †Glyptospira tricostata
 * †Glyptospira turrita
 * †Glyptosteges
 * †Glyptosteges angustus – type locality for species
 * †Glyptosteges insculptus
 * †Glyptosteges intricatus – type locality for species
 * †Glyptosteges sulcatus
 * †Glyptotomaria – type locality for genus
 * †Glyptotomaria apiarium – type locality for species
 * †Glyptotomaria marginata – type locality for species
 * †Glyptotomaria pistra – type locality for species
 * †Gnamptorhynchos
 * †Gnamptorhynchos prayi
 * GnathorhizaDB.jpg †[[Gnathorhiza]]
 * †Gnathorhiza dikeloda – type locality for species
 * †Gnathorhiza serrata
 * †Gomphostrobus
 * †Gomphostrobus bifidus
 * †Goniarina
 * †Goniarina appeli – type locality for species
 * †Goniarina diabloensis
 * †Goniarina futilis
 * †Goniarina magniextensa
 * †Goniarina permiana
 * †Goniarina pyelodes
 * †Goniarina striata
 * †Goniasma
 * †Goniasma lasallense
 * Goniatitidae - Goniatites species.JPG †[[Goniatites]]
 * †Goniatites eganensis
 * †Goniatites multiliratus
 * †Goniocephalus – type locality for genus
 * †Goniocephalus willistoni – type locality for species
 * †Goniocladia
 * †Goniocladia americana
 * †Gonioloboceras
 * †Gonioloboceras bridgeportense – type locality for species
 * †Gonioloboceras goniolobus
 * †Gonioloboceras gracellenae
 * †Gonioloboceras parrishi
 * †Gonioloboceras welleri
 * †Gorgodon – type locality for genus
 * †Gorgodon minutus – type locality for species
 * †Gosseletina
 * †Gosseletina permiana – type locality for species
 * †Grammatodon
 * †Grammatodon politus
 * †Grandaurispina
 * †Grandaurispina bella – type locality for species
 * †Grandaurispina belliformis
 * †Grandaurispina crassa
 * †Grandaurispina elongata
 * †Grandaurispina gibbosa – type locality for species
 * †Grandaurispina kingorum – type locality for species
 * †Grandaurispina meekana
 * †Grandaurispina rara
 * †Grandaurispina rudis
 * †Grandaurispina signata – type locality for species
 * †Grandaurispina undulata
 * †Grandaurispina vaga – type locality for species
 * †Graphiocrinus
 * †Graphiocrinus bridgeportensis – type locality for species
 * RugosaOrdovician.jpg †[[Grewingkia]]
 * †Grewingkia crassa
 * †Grewingkia franklinensis
 * †Grewingkia robusta
 * †Griffithidella
 * †Griffithidella alternata
 * †Griffithidella doris
 * †Gryphochiton
 * †Gryphochiton girtyi – type locality for species
 * †Guadalupelosia
 * †Guadalupelosia inexpectans
 * †Guadalupia
 * †Guadalupia auricula – type locality for species
 * †Guadalupia cupulosa – type locality for species
 * †Guadalupia favosa – type locality for species
 * †Guadalupia lepta – type locality for species
 * †Guadalupia microcamera – type locality for species
 * †Guadalupia minuta – type locality for species
 * †Guadalupia ramescens – type locality for species
 * †Guadalupia vasa – type locality for species
 * †Guadalupia zitteliana
 * †Guizhoupecten
 * †Guizhoupecten cheni
 * †Gypospirifer – type locality for genus
 * †Gypospirifer anancites – type locality for species
 * Spiriferidae - Gypospirifer condor.JPG †[[Gypospirifer condor]]
 * †Gypospirifer infraplicus
 * †Gypospirifer nelsoni

H

 * †Hadropipetta
 * †Hadropipetta ancora
 * †Hamburgia
 * †Hamburgia chappelensis – type locality for species
 * †Hamburgia texana
 * †Haplistion
 * †Haplistion aeluroglossa – type locality for species
 * †Haplistion megalochetus – type locality for species
 * †Haplistion skinneri – or unidentified comparable form
 * †Hayasakapecten
 * †Hayasakapecten americanus
 * †Healdia
 * †Healdia unispinosa – type locality for species
 * †Healdia vidriensis – type locality for species
 * †Hebertella
 * †Hebertella occidentalis
 * †Hebetorthoceras
 * †Hebetorthoceras brokenarrowense
 * †Helicoconchus – type locality for genus
 * †Helicoconchus elongatus – type locality for species
 * Helicoprion ferrieri fossil shark jaw, Brewster County TX.jpg †[[Helicoprion]]
 * †Helicoprion davisii
 * †Heliospongia
 * †Heliospongia excavata
 * †Heliospongia ramosa
 * †Heliospongia vokesi
 * †Helminthochiton
 * †Helminthochiton simplex
 * †Hemileurus
 * †Hemileurus runcinatus
 * †Hemiliroceras
 * †Hemiliroceras reticulatum
 * †Hemizyga
 * Hercosestria040111.jpg †[[Hercosestria]]
 * †Hercosestria cribrosa – type locality for species
 * †Hercosestria hystricula
 * †Hercosestria laevis
 * †Hercosia
 * †Hercosia delicata
 * †Hercosia uddeni – type locality for species
 * †Heritschioides
 * †Hermosanema
 * †Hermosanema carinatum – type locality for species
 * †Hesperiella
 * †Hesperiella permianus – type locality for species
 * †Hesperiella wordensis
 * †Heteralosia
 * †Heteralosia hystricula – type locality for species
 * †Heteralosia magnispina
 * †Heteralosia paucispinosa
 * †Heteralosia tenuispina
 * †Heteralosia vidriensis
 * †Heteraria
 * †Heteraria blakemorei
 * †Heterelasma
 * †Heterelasma angulatum
 * †Heterelasma concavum – type locality for species
 * †Heterelasma contortum
 * †Heterelasma geniculatum
 * †Heterelasma gibbosum – type locality for species
 * †Heterelasma glansfagea – type locality for species
 * †Heterelasma lenticularia
 * †Heterelasma magnum
 * †Heterelasma pentagonum – type locality for species
 * †Heterelasma quadratum
 * †Heterelasma shumardianum
 * †Heterelasma solidum – type locality for species
 * †Heterelasma sulciplicatum
 * †Heterelasma venustulum
 * †Heteropecten
 * †Heteropecten vanvleeti
 * †Heteroschizodus – type locality for genus
 * †Heteroschizodus macomoides – type locality for species
 * †Hexirregularia – type locality for genus
 * †Hexirregularia nana – type locality for species
 * †Hiscobeccus – tentative report
 * †Hiscobeccus capax
 * †Hoffmannia – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Hoffmannia fisheri – type locality for species
 * †Holcacephalus
 * †Holcacephalus tenerus
 * †Holosia – type locality for genus
 * †Holosia ovalis – type locality for species
 * †Holosia ovoidea
 * †Holosia regularis
 * †Holotricharina – type locality for genus
 * †Holotricharina hirsuta – type locality for species
 * †Holotricharina sparsa – type locality for species
 * †Homagnostus
 * †Hormotoma
 * †Hormotoma moderata – type locality for species
 * †Hustedia
 * †Hustedia ampullacea – type locality for species
 * †Hustedia bipartita
 * †Hustedia catella – type locality for species
 * †Hustedia cepacea
 * †Hustedia citeria
 * †Hustedia compressa
 * †Hustedia connorsi – type locality for species
 * †Hustedia consuta – type locality for species
 * †Hustedia crepax
 * †Hustedia culcitula
 * †Hustedia cuneata – type locality for species
 * †Hustedia decollatensis
 * †Hustedia demissa
 * †Hustedia glomerosa
 * †Hustedia hapala
 * †Hustedia hessensis – type locality for species
 * †Hustedia huecoensis – type locality for species
 * †Hustedia inconspicua
 * †Hustedia lusca – type locality for species
 * †Hustedia meekana
 * †Hustedia mormoni
 * †Hustedia mormonii
 * †Hustedia narinosa
 * †Hustedia opsia
 * †Hustedia papillata – type locality for species
 * †Hustedia pugilla – type locality for species
 * †Hustedia pusilla
 * †Hustedia rupinata
 * †Hustedia samiata
 * †Hustedia sculptilis – type locality for species
 * †Hustedia spicata – type locality for species
 * †Hustedia stataria
 * †Hustedia texana
 * †Hustedia tomea
 * †Hustedia trisecta
 * †Hustedia trita
 * Hybodus NT.jpg †[[Hybodus]]
 * †Hybodus copei – type locality for species
 * †Hypergonia
 * †Hypergonia percostata
 * †Hypopsia
 * †Hypopsia versuta
 * †Hypselentoma
 * †Hypselentoma ornata – type locality for species
 * †Hypseloconus
 * †Hypsiptycha
 * †Hypsiptycha argenturbicum
 * †Hypsiptycha neenah
 * †Hystriculina
 * †Hystriculina convexa
 * †Hystriculina dugoutensis – type locality for species
 * †Hystriculina minima
 * †Hystriculina pumila
 * †Hystriculina sulcata – type locality for species
 * †Hystriculina ventroplana
 * †Hystriculina wabashensis
 * †Hystricurus

I

 * †Ianthinopsis
 * †Ianthinopsis medialis
 * †Icriodus
 * †Icriodus eolatericrescens
 * †Icriodus gravesi
 * †Ideliopsis – type locality for genus
 * †Ideliopsis ovalis – type locality for species
 * †Illusioluidia – type locality for genus
 * †Illusioluidia teneryi – type locality for species
 * †Incisimura – type locality for genus
 * †Incisimura bella – type locality for species
 * †Incrustospongia – type locality for genus
 * †Incrustospongia meandrica – type locality for species
 * †Institella
 * †Institella leonardensis – type locality for species
 * †Insulipora
 * †Insulipora elegans
 * †Iotina
 * †Iotina minuta
 * †Isacrodus – type locality for genus
 * †Isacrodus marthae – type locality for species
 * †Ischnoptygma
 * †Ischnoptygma archibaldi – type locality for species
 * †Ischnoptygma valentinei – type locality for species
 * Isodectes obtusus.jpg †[[Isodectes]]
 * †Isodectes obtusus – type locality for species
 * †Isogramma
 * †Isogramma concavum
 * †Isogramma diabloense
 * †Isogramma lobatum
 * †Isogramma millepunctata
 * †Isogramma vidriense
 * †Isotrypa
 * †Ivanovia

J

 * Janassa bituminosa.jpg †[[Janassa]]
 * †Jeffersonia
 * †Jeffersonia granosa
 * †Jereina – type locality for genus
 * †Jereina cylindrica – type locality for species
 * †Jereina ramosa – type locality for species
 * †Jinogondolella
 * †Jinogondolella aserrata
 * †Jinogondolella gladirobusta
 * †Jinogondolella nankingensis
 * †Jinogondolella postserrata
 * †Juresania
 * †Juresanites
 * †Juresanites colemanensis – type locality for species

K

 * †Kahneria – type locality for genus
 * †Kahneria seltina – type locality for species
 * †Kaibabella
 * †Kaibabella basilica
 * †Kalodomia
 * †Kalodomia rugosa
 * †Kargalites
 * †Kargalites subquadratum
 * †Kargalites subquadratus – type locality for species
 * †Kargalites type locality for species – informal
 * †Kaskia
 * †Kaskia rarus
 * †Kellettina
 * †Kellettina vidriensis – type locality for species
 * †Kindlella – type locality for genus
 * †Kindlella centrinoda – type locality for species
 * †Kindlella fissiloba – type locality for species
 * †Kingopora – tentative report
 * †Kingstonia
 * †Kingstonia pontotocensis
 * †Kinsabia
 * †Kinsabia variegata
 * †Kirkbya
 * †Knightina – tentative report
 * †Knightina cuestaforma – type locality for species
 * †Knightina macknighti – type locality for species
 * †Knightites
 * †Knightites maximus – type locality for species
 * †Knightites medius – type locality for species
 * †Knightoceras
 * †Knightoceras kempae – type locality for species
 * †Knoxosaurus – type locality for genus
 * †Knoxosaurus niteckii – type locality for species
 * †Kochiproductus
 * †Kochiproductus elongatus
 * †Kochiproductus occidentalis – type locality for species
 * †Kochiproductus peruvianus
 * †Kochiproductus primitivus – type locality for species
 * †Kochiproductus quadratus
 * †Kochiproductus victorioensis – type locality for species
 * †Kockelella
 * †Kockelella ortus
 * †Komia
 * †Komiella – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Komiella ostiolata
 * †Kormagnostus
 * †Kormagnostus seclusus
 * †Kozlowskia
 * †Kozlowskia alata
 * †Kozlowskia anterosulcata
 * †Kozlowskia capaci
 * †Kozlowskia kingi
 * †Kozlowskia nasuta
 * †Kozlowskia splendens
 * †Kozlowskia subsphaeroidalis
 * †Kutorginella
 * †Kutorginella dartoni – type locality for species
 * †Kutorginella lasallensis
 * †Kutorginella robusta
 * †Kutorginella sullivanensis
 * †Kutorginella uddeni
 * †Kutorginella umbonata

L

 * †Labidosaurikos
 * †Labidosaurikos meachami – type locality for species
 * Labidosaurus.jpg †[[Labidosaurus]]
 * †Labidosaurus barkeri
 * †Labidosaurus hamatus – type locality for species
 * †Labridens
 * †Labridens shupei
 * †Lacunospira
 * †Lacunospira alta – type locality for species
 * †Lacunospira altsia
 * †Lacunospira lirata – type locality for species
 * †Lamarodus – type locality for genus
 * †Lamarodus triangulus – type locality for species
 * †Lambeoceras
 * †Lambeoceras rotundum
 * †Lamellosia
 * †Lamellosia lamellosa
 * †Lamellospira
 * †Lamellospira cincta – type locality for species
 * †Lamellospira conica
 * †Lamellospira spinosa – type locality for species
 * †Langepis – type locality for genus
 * †Langepis campbelli
 * †Laudonocrinus
 * †Laudonocrinus subsinuatus
 * †Lawnia – type locality for genus
 * †Lawnia taylorensis – type locality for species
 * †Lebachia
 * †Lecanospira – type locality for genus
 * †Lecanospira lecanospiroides – type locality for species
 * †Lecanospira sanctisabae
 * †Lecythiocrinus
 * †Leella
 * †Leella bellula – or unidentified comparable form
 * †Leioclema
 * †Leioclema dozierense – type locality for species
 * †Leioclema shumardi
 * †Leiorhynchoidea
 * †Leiorhynchoidea amygdaloidea – type locality for species
 * †Leiorhynchoidea rotundidorsa
 * †Leiorhynchoidea scelesta
 * †Leiorhynchoidea sublamellosa
 * †Leiorhynchoidea sulcata
 * †Leiorhynchus
 * †Leiorhynchus bisulcatum
 * †Leiorhynchus nobilis
 * †Leiostegium
 * †Lekiskochiton – type locality for genus
 * †Lekiskochiton fornicis – type locality for species
 * †Lemonea
 * †Lemonea cylindrica
 * †Lemonea digitata – type locality for species
 * †Lemonea simplex – type locality for species
 * †Leonardophyllum
 * †Leonardophyllum kingi – type locality for species
 * †Lepetopsis
 * †Lepetopsis capitanensis – type locality for species
 * †Lepetopsis haworthi – type locality for species
 * †Lepidocrania – type locality for genus
 * †Lepidocrania sparsispinosa – type locality for species
 * †Lepidocrania sublamellosa
 * †Lepidocrania tardispinosa – type locality for species
 * †Lepidocyclus
 * †Lepidocyclus laddi
 * †Lepidocyclus manniensis
 * †Lepidophyllum
 * †Lepidospirifer
 * †Lepidospirifer angulatus – type locality for species
 * †Lepidospirifer costellus – type locality for species
 * †Lepidospirifer demissus – type locality for species
 * †Lepidospirifer inferus
 * †Leptagonia
 * †Leptalosia
 * †Leptalosia ovalis
 * †Leptodesma
 * †Leptodesma falcata
 * †Leptodesma gouldii
 * †Leptodesma guadalupensis
 * †Leptodus
 * †Leptodus americana
 * †Leptodus guadalupensis – type locality for species
 * †Leptomphalus
 * †Leptomphalus micidus – type locality for species
 * †Leptoplastides
 * †Leptoptygma
 * †Leptoptygma subtilistriatum
 * †Leptotygria
 * †Lercaritubus
 * †Lercaritubus problematicus
 * †Lesueurilla
 * †Leurosina – type locality for genus
 * †Leurosina delicata
 * †Leurosina lata – type locality for species
 * †Leurosina marginata
 * †Leurosina serratoseptata
 * †Leurosina sinesulca
 * †Leurosina vulgarica
 * Breviconic ellesmeroceridan.svg †[[Levisoceras]]
 * †Levisoceras contractum – type locality for species
 * †Levizygopleura
 * †Levizygopleura williamsi
 * †Lichenaria
 * †Limatulina – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Limatulina striaticostata – type locality for species
 * †Limbella
 * †Limbella costata
 * †Limbella costellata
 * †Limbella limbata – type locality for species
 * †Limbella victorioensis
 * †Limbella wolfcampensis – type locality for species
 * †Lindostromella
 * †Lindostromella patula
 * †Lindstroemia – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Lindstroemia cylindrica – type locality for species
 * †Lindstroemia permiana
 * Lingula
 * †Linipalus
 * †Linipalus magnispinus
 * †Linoproductus
 * †Linoproductus cora
 * †Linoproductus delicatus
 * †Linoproductus meniscus
 * †Linoproductus nasutus – type locality for species
 * †Linoproductus phosphaticus
 * †Linoproductus prattenianus
 * †Linoproductus waagenianus
 * †Liosotella
 * †Liosotella costata – type locality for species
 * †Liosotella irregularis – type locality for species
 * †Liosotella opima – type locality for species
 * †Liosotella parva – type locality for species
 * †Liosotella popei – type locality for species
 * †Liosotella rotunda
 * †Liosotella spinumbona
 * †Liosotella tetragonalis – type locality for species
 * †Liosotella texana
 * †Liosotella wordensis – type locality for species
 * †Liraria
 * †Liraria lirata
 * †Lirellaria
 * †Lirellaria costellata
 * †Lirellaria crassa
 * †Lirellaria diabloensis
 * †Liroceras
 * †Liroceras globulare
 * †Lissochonetes
 * †Lissochonetes geinitzianus
 * †Lissochonetes parvisulcatus
 * †Lithostrotionella – tentative report
 * †Llanoaspis
 * †Llanoaspis virginica
 * †Llanoceras – type locality for genus
 * †Llanoceras gracile – type locality for species
 * †Llanocystis – type locality for genus
 * †Llanocystis wilbernsensis – type locality for species
 * †Lobatannularia
 * †Lophonema
 * †Lophophyllidium
 * †Lophophyllidium absitum – type locality for species
 * †Lophophyllidium compressum
 * †Lophophyllidium confertum – or unidentified comparable form
 * †Lophophyllidium cyathaxoniaforme – type locality for species
 * †Lophophyllidium distortum
 * †Lophophyllidium dunbari
 * †Lophophyllidium erugum – type locality for species
 * †Lophophyllidium lanosum – type locality for species
 * †Lophophyllidium magnocolumnare – type locality for species
 * †Lophophyllidium plummeri – type locality for species
 * †Lophophyllidium profundum
 * †Lophophyllidium proliferum
 * †Lophophyllidium radicosum
 * †Lophophyllidium skinneri – type locality for species
 * †Lophophyllidium texanum
 * †Lophophyllidium vallum – type locality for species
 * †Lophophyllidium vidriensis – type locality for species
 * †Lophophyllidium westii
 * †Lophophyllidium wewokanum
 * †Lophotichium
 * †Lophotichium dugoutense – type locality for species
 * †Lophotichium rotundiseptum – type locality for species
 * †Lophotichium simulatum – type locality for species
 * †Lowenstamia – type locality for genus
 * †Lowenstamia ampla
 * †Lowenstamia texana – type locality for species
 * †Loxonema – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Loxonema inconspicuum – type locality for species
 * †Loxophragmus – type locality for genus
 * †Loxophragmus ellipticus – type locality for species
 * †Luederia – type locality for genus
 * †Luederia kempi – type locality for species
 * †Luterospongia – type locality for genus
 * †Luterospongia texana – type locality for species
 * †Lyroschizodus
 * †Lyroschizodus oklahomensis
 * †Lyroschizodus orbicularis – type locality for species
 * Lysorophus.jpg †[[Lysorophus]]
 * †Lysorophus tricarinatus
 * †Lytvolasma
 * †Lytvolasma aucta – type locality for species

M

 * †Mackinneyella
 * †Mackinneyella hinganensis – or unidentified related form
 * †Mackinneyella praepluriformis – or unidentified comparable form
 * †Mackinneyella robustiformis
 * †Macluritella
 * †Macluritella gyroceras
 * †Macluritella uniangulata
 * †Macrochilina – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Macrochilina modesta – type locality for species
 * †Macrodontacanthus – type locality for genus
 * †Macrodontacanthus kingi – type locality for species
 * †Macroporella
 * †Macroporella verticillata – type locality for species
 * †Madarosia
 * †Madarosia anterolamellata
 * †Madarosia pentagona
 * †Maeandrostia
 * †Maeandrostia kansasensis
 * †Manipora
 * †Manipora amicarum
 * †Manipora magna – type locality for species
 * †Manipora trapezoidalis – type locality for species
 * †Manzanospira
 * †Manzanospira carinata
 * †Manzanospira manzanicum
 * †Manzanospira wordensis – type locality for species
 * †Marathonites
 * †Marathonites jpsmithi – type locality for species
 * †Marathonites moorei – type locality for species
 * †Marathonites vidriensis – type locality for species
 * †Marginatia
 * †Marginifera
 * †Marginifera cristobalensis
 * †Marginifera manzanica
 * †Marginifera opima
 * †Marginifera texana
 * †Martinia
 * †Martinia causaria
 * †Martinia cruenta
 * †Martinia exigua
 * †Martinia fucina
 * †Martinia miranda – type locality for species
 * †Martinia nealranchensis
 * †Martinia rhomboidalis
 * †Martinia wolfcampensis – type locality for species
 * †Mastersonia – type locality for genus
 * †Mastersonia driverensis – type locality for species
 * †Mckittrickella – type locality for genus
 * †Mckittrickella pratti – type locality for species
 * †Mcqueenoceras
 * †Meandrostia
 * †Meandrostia tortacloaca
 * †Medlicottia
 * †Medlicottia arroyoensis – type locality for species
 * †Medlicottia chozaensis – type locality for species
 * †Medlicottia copei – type locality for species
 * †Medlicottia costellifera – type locality for species
 * †Medlicottia kingorum – type locality for species
 * †Medlicottia milleri – type locality for species
 * †Meekella
 * †Meekella angustiplicata
 * †Meekella attenuata
 * †Meekella calathica – type locality for species
 * †Meekella caperata – type locality for species
 * †Meekella circularis
 * †Meekella enormis – type locality for species
 * †Meekella hessensis – type locality for species
 * †Meekella intermedia
 * †Meekella magnifica – type locality for species
 * †Meekella mexicana
 * †Meekella multilirata – type locality for species
 * †Meekella occidentalis – type locality for species
 * †Meekella prionota – type locality for species
 * †Meekella skenoides
 * †Meekella striaticostata
 * †Meekella striatocostata
 * †Meekella texana – type locality for species
 * †Meekopora
 * †Meekospira
 * †Meekospira choctawensis
 * †Meekospira mimiae – type locality for species
 * †Meekospira peracuta
 * †Megactenopetalus
 * †Megactenopetalus kaibabanus
 * †Megousia
 * †Megousia auriculata
 * †Megousia definita – type locality for species
 * †Megousia flexuosa
 * †Megousia girtyi – type locality for species
 * †Megousia mucronata
 * †Megousia umbonata
 * †Megousia waageniana – type locality for species
 * †Merista
 * †Merista maccullochensis – type locality for species
 * †Mesolobus
 * Metacoceras discoideum 01.jpg †[[Metacoceras]]
 * †Metacoceras baylorense – type locality for species
 * †Metacoceras cheneyi – type locality for species
 * †Metacoceras inconspicuum
 * †Metacrimites
 * †Metacrimites adamsi – type locality for species
 * †Metacrimites defordi – type locality for species
 * †Metacrimites marathonensis – type locality for species
 * †Metacrimites newelli – type locality for species
 * †Metaindocrinus
 * †Metaindocrinus cooperi – type locality for species
 * †Metalegoceras
 * †Metalegoceras aricki – type locality for species
 * †Metalegoceras baylorense – type locality for species
 * †Metalegoceras schucherti – type locality for species
 * †Metaperrinites
 * †Metaperrinites cumminsi – type locality for species
 * †Metaperrinites vicinus
 * †Metapronorites
 * †Metapronorites pseudotimorensis
 * †Metarmosaurus – type locality for genus
 * †Metarmosaurus fossatus – type locality for species
 * Meteoraspis cropped.png †[[Meteoraspis]]
 * †Meteoraspis metra
 * †Metoptoma
 * †Metoptoma texana – type locality for species
 * †Metriolepis – type locality for genus
 * †Metriolepis carotica
 * †Metriolepis diabloensis
 * †Metriolepis exserta
 * †Metriolepis irenae
 * †Metriolepis larina
 * †Metriolepis nabis
 * †Metriolepis pedicosa
 * †Metriolepis pinea
 * †Metriolepis pulvinata – type locality for species
 * †Metriolepis scrupea
 * †Metriolepis tegulata – type locality for species
 * †Metriolepis ziczac – type locality for species
 * †Mexicoceras
 * †Mexicoceras guadalupense – type locality for species
 * †Michelinoceras – tentative report
 * †Michelinoceras guadalupense – type locality for species
 * †Micraphelia
 * †Micraphelia pumilis
 * †Micraphelia scitula
 * †Micraphelia subalata
 * Micraroter.jpg †[[Micraroter]] – tentative report
 * †Micraroter erythrogeios
 * †Microantyx
 * †Microantyx botoni
 * †Microantyx mudgei
 * †Microbaltoceras – type locality for genus
 * †Microbaltoceras minore – type locality for species
 * †Microdoma
 * †Microdoma conicum
 * †Microdoma gavinae
 * †Microptychis
 * †Microptychis insolita – type locality for species
 * †Microstaura – type locality for genus
 * †Microstaura doliolum
 * †Microstaurella – type locality for genus
 * †Microstaurella minima – type locality for species
 * †Microstaurella parva – type locality for species
 * †Millerella
 * †Millerella marblensis
 * †Millkoninckioceras
 * †Millkoninckioceras bibbi
 * †Miltonella – type locality for genus
 * †Miltonella shupei – type locality for species
 * †Minammodytes
 * †Minilya
 * †Minilya girtyi
 * †Minispongia
 * †Minispongia constricta – type locality for species
 * †Mizzia
 * †Mizzia velebitana
 * †Monaxoradiata – type locality for genus
 * †Monaxoradiata lamina – type locality for species
 * †Monodiexodina
 * †Monodiexodina bispatulata
 * †Monodiexodina linearis – tentative report
 * †Monophyllum
 * †Monophyllum cassum – type locality for species
 * †Monotis – tentative report
 * †Moorefieldella
 * †Mooreoceras
 * †Mooreoceras giganteum – type locality for species
 * †Mooreocrinus
 * †Mooreocrinus magdalensis – type locality for species
 * †Moreauoceras
 * †Moreauoceras milleri
 * †Morrowcrinus – tentative report
 * †Mourlonia
 * †Multistella – type locality for genus
 * †Multistella porosa
 * †Murchisonia
 * †Murchisonia gouldi
 * †Muriceras – type locality for genus
 * †Muriceras anomalum – type locality for species
 * †Muriceras curviseptatum – type locality for species
 * †Muriceras gracile – type locality for species
 * †Muriceras hebetum – type locality for species
 * †Muriceras micromurus – type locality for species
 * †Muriceras moderatum – type locality for species
 * †Muriceras murus – type locality for species
 * †Myalina
 * †Myalina acutirostris – type locality for species
 * †Myalina aviculoides
 * †Myalina copei – type locality for species
 * †Myalina lamellosa – type locality for species
 * †Myalina permiana
 * †Myalina plicata – type locality for species
 * †Myalina pliopetina – type locality for species
 * †Myalina recta – tentative report
 * †Myalina squamosa – tentative report
 * †Myalina wyomingensis – tentative report
 * Mycterosaurus.jpg †[[Mycterosaurus]] – type locality for genus
 * †Mycterosaurus longiceps – type locality for species
 * †Myoconcha
 * †Myoconcha costulata – type locality for species

N

 * †Nabespecha
 * †Nabespecha leonardia – type locality for species
 * †Nanobamus – type locality for genus
 * †Nanobamus macrorhinus – type locality for species
 * †Nasocephalus
 * †Nasocephalus flabellatus
 * †Nasocephalus nasutus
 * †Naticopsis
 * †Naticopsis judithae
 * †Naticopsis remex
 * †Naticopsis shumardi – tentative report
 * †Naticopsis transversa – type locality for species
 * †Neilsonia
 * †Neilsonia laticincta
 * Neldasaurus wrightae.jpg †[[Neldasaurus]]
 * †Neldasaurus wrightae
 * †Nemejcopteris
 * †Neoaganides
 * †Neoaganides grahamensis
 * †Neocalamites – or unidentified comparable form
 * †Neochonetes
 * †Neochonetes costellata – type locality for species
 * †Neochonetes granulifer
 * †Neochonetes liratus
 * †Neochonetes magna
 * †Neochonetes meekanus – tentative report
 * †Neochonetes parvus
 * †Neochonetes transversalis
 * †Neochonetes victoriana – type locality for species
 * †Neocrimites
 * †Neocrimites defordi
 * †Neocrimites type locality for species – informal
 * †Neodimorphoceras
 * †Neodimorphoceras lenticulare
 * †Neodimorphoceras oklahomae
 * †Neodimorphoceras plummerae – type locality for species
 * †Neodimorphoceras texanum
 * †Neogeoceras
 * †Neogeoceras girtyi
 * †Neoglyphioceras
 * †Neoglyphioceras entogonum
 * †Neoicoceras
 * †Neokoninckophyllum
 * †Neokoninckophyllum cooperi – type locality for species
 * †Neokoninckophyllum deciensis – type locality for species
 * †Neokoninckophyllum dunbari – type locality for species
 * †Neophricadothyris
 * †Neophricadothyris conara – type locality for species
 * †Neophricadothyris crassibecca – type locality for species
 * †Neophricadothyris transversa
 * †Neopopanoceras
 * †Neopopanoceras bowmani – type locality for species
 * †Neopronorites
 * †Neopronorites bakeri – type locality for species
 * †Neopronorites boesei
 * †Neoshumardites
 * †Neoshumardites gaptankensis
 * Trigonotretidae - Neospirifer ravana.JPG †[[Neospirifer]]
 * †Neospirifer amphigyus – type locality for species
 * †Neospirifer apothescelus – type locality for species
 * †Neospirifer bakeri – type locality for species
 * †Neospirifer cameratus – tentative report
 * †Neospirifer formulosus
 * †Neospirifer huecoensis – type locality for species
 * †Neospirifer kansasensis
 * †Neospirifer mansuetus
 * †Neospirifer neali
 * †Neospirifer notialis
 * †Neospirifer placidus
 * †Neospirifer t. – informal
 * †Neospirifer triplicatus
 * †Neospirifer venezuelensis
 * †Neotryplasma
 * †Neozeacrinus
 * †Neozeacrinus uddeni – type locality for species
 * Neuropteris PAMuseum.jpg †[[Neuropteris]]
 * †Neuropteris cordata – tentative report
 * †Neuropteris lindahli – or unidentified comparable form
 * †Newellites
 * †Newellites richardsoni – type locality for species
 * †Newellospongia – type locality for genus
 * †Newellospongia perforata – type locality for species
 * †Nicollidina
 * †Nicollidina remscheidensis
 * †Nielsenoceras
 * †Nielsenoceras skinneri – type locality for species
 * †Niviconia – type locality for genus
 * †Niviconia abrupta
 * †Niviconia globosa
 * †Norwoodia
 * †Norwoodia quadrangularis
 * †Nothopindax
 * †Nothopindax egregius
 * †Notothyris
 * †Notothyris gillilandensis
 * †Notothyris planiplicata
 * †Notothyris venusta – type locality for species
 * †Novaculapermia – type locality for genus
 * †Novaculapermia boydi – type locality for species
 * †Novlepatella
 * †Novlepatella beedei – type locality for species
 * †Novlepatella parrishi
 * †Novlepatella patella – type locality for species
 * †Novoameura
 * †Novoameura vitrumons – type locality for species
 * †Nucleospira
 * †Nucleospira cunctata
 * Nuculidae - Nucula piacentina.jpg [[Nucula]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * Nuculana
 * †Nuculavus
 * †Nuculavus levatiformis
 * †Nuculavus okawensis – or unidentified related form
 * †Nuculopsis
 * †Nuculopsis girtyi
 * †Nudauris
 * †Nudauris convexa
 * †Nudauris diabloensis
 * †Nudauris enigmatica – type locality for species
 * †Nudauris linospina – type locality for species
 * †Nudauris reticulata – type locality for species
 * †Nudauris splendens – type locality for species
 * †Nudauris transversa
 * †Nudauris tribulosa
 * †Nudauris whitei
 * †Nuia
 * †Nuia siberica
 * †Nybyoceras
 * †Nybyoceras montoyense
 * †Nyctopora
 * †Nyctopora mutabilis – type locality for species
 * †Nyctopora nondescripta – type locality for species

O

 * †Obliquipecten
 * †Obliquipecten granti
 * †Ochmazochiton – type locality for genus
 * †Ochmazochiton comptus – type locality for species
 * †Odonopteris
 * †Odontopteris
 * †Odontopteris conferta
 * †Odontopteris fischeri
 * †Odontopteris genuina
 * †Odontopteris neuropteroides
 * †Odontopteris osmundaeformis – or unidentified comparable form
 * †Oistodus
 * †Oldhamina – tentative report
 * †Olenus
 * †Oligorthis
 * †Oligorthis arbucklensis
 * †Ombonia
 * †Ombonia guadalupensis
 * †Ombonia invecta
 * †Omphalotrochus
 * †Omphalotrochus alleni – type locality for species
 * †Omphalotrochus cochisensis – type locality for species
 * †Omphalotrochus hessensis – type locality for species
 * †Omphalotrochus obtusispira – type locality for species
 * †Omphalotrochus spinosus – type locality for species
 * †Omphalotrochus wolfcampensis – type locality for species
 * †Oncosarina
 * †Oncosarina rotunda
 * †Oncosarina spinicostata – type locality for species
 * †Oncosarina whitei
 * †Oneotoceras
 * †Onniella
 * †Onniella plicata – type locality for species
 * †Onniella quadrata
 * †Onychochilus
 * Ophiacodon mirus cropped.png †[[Ophiacodon]] – type locality for genus
 * †Ophiacodon major – type locality for species
 * †Ophiacodon retroversus – type locality for species
 * †Ophiacodon uniformis – type locality for species
 * †Ophileta
 * †Ophileta polygyratus
 * †Ophileta rotuliformis
 * †Opisthotreta
 * †Opisthotreta depressa
 * †Orbicoelia
 * †Orbicoelia guadalupensis
 * †Orbicoelia inflata
 * †Orbicoelia tholiaphor – type locality for species
 * †Orbicoelia tumibilis
 * †Orbiculoidea
 * †Orbiculoidea missouriensis
 * †Ormoceras
 * †Ormoceras dartoni
 * Orodus sp1DB.jpg †[[Orodus]]
 * †Orodus corrugatus – type locality for species
 * †Orospira
 * †Orthacanthus
 * †Orthacanthus compressus
 * †Orthacanthus texensis
 * †Orthisina – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Orthoceracone
 * †Orthograptus
 * †Orthograptus fastigatus
 * †Orthograptus quadrimucronatus
 * †Orthograptus thorsteinssoni
 * †Orthomyalina
 * †Orthomyalina subquadrata
 * †Orthonema
 * †Orthonema paedice – type locality for species
 * †Orthonema paxillus – type locality for species
 * †Orthonema salteri
 * †Orthonema striatonodosum
 * †Orthonema telescopiforme – type locality for species
 * †Orthonychia
 * †Orthonychia bowsheri – type locality for species
 * †Orthotetella
 * †Orthotetella wolfcampensis – type locality for species
 * †Orthotetes
 * †Orthotetes mutabilis – or unidentified comparable form
 * †Orthothetina
 * †Orthotichia
 * †Orthotichia hueconiana – type locality for species
 * †Orthotichia irregularis
 * †Orthotichia kozlowskii – type locality for species
 * †Orthotichia newelli – type locality for species
 * †Ossimimus – type locality for genus
 * †Ossimimus robustus
 * †Ostodolepis – type locality for genus
 * †Ostodolepis brevispinatus – type locality for species
 * †Oulodus
 * †Oulodus cristagalli – tentative report
 * †Ovatia
 * †Oxyprora
 * †Oxyprora capitanensis – type locality for species
 * †Oxyprora missouriensis
 * †Ozarkina
 * †Ozarkina typica
 * †Ozarkodina
 * †Ozarkodina bohemica
 * †Ozarkodina wurmi – tentative report
 * †Ozawainella – tentative report
 * †Ozawainella inflata – type locality for species

P

 * †Pachylyroceras
 * †Pachylyroceras cloudi
 * †Pachylyroceras newsomi
 * †Padgettia
 * †Padgettia readi – type locality for species
 * †Paladin
 * †Paladin helmsensis
 * †Palaeanodonta
 * †Palaeocaudina
 * †Palaeocaudina kansasensis
 * †Palaeoceras – type locality for genus
 * †Palaeoceras mutabile – type locality for species
 * †Palaeoceras undulatum – type locality for species
 * †Palaeogeminella
 * †Palaeogeminella folkii
 * †Palaeoneilo
 * †Palaeoneilo taffiana
 * Palaeoniscus vratislavensis.JPG]] †Palaeoniscus'' – tentative report
 * †Palaeophyllum
 * †Palaeophyllum cateniforme – type locality for species
 * †Palaeophyllum gracile – type locality for species
 * †Palaeophyllum margaretae – type locality for species
 * †Palaeophyllum thomi
 * †Palaeostylus
 * †Paleochiridota
 * †Paleochiridota plummerae
 * †Paleochiridota radiata – type locality for species
 * †Paleochiridota terquemi – type locality for species
 * †Paleochiridota waylandensis – type locality for species
 * †Paleofavosites
 * †Paleofavosites kuellmeri – type locality for species
 * †Paleofavosites prayi – type locality for species
 * †Paleofavosites sparsus – type locality for species
 * †Paleowaagia
 * †Paleowaagia cooperi – type locality for species
 * †Paleyoldia
 * †Paleyoldia glabra
 * †Panderodus
 * †Panderodus equicostatus
 * †Panderodus panderi
 * †Panderodus unicostatus
 * †Panduralimulus – type locality for genus
 * †Panduralimulus babcocki – type locality for species
 * Pantylus1DB.jpg †[[Pantylus]] – type locality for genus
 * †Pantylus coicodus – type locality for species
 * †Pantylus cordatus – type locality for species
 * †Parabolinella
 * †Parabolinella triarthroides – tentative report
 * †Parabolinella triathroides – tentative report
 * †Paraboultonia – type locality for genus
 * †Paraboultonia splendens – type locality for species
 * †Paraceltites
 * †Paraceltites altudensis – type locality for species
 * †Paraceltites elegans
 * †Paraceltites multicostatus – type locality for species
 * †Paraceltites ornatus
 * †Paraconularia
 * †Paraconularia leonardensis
 * †Paracravenoceras
 * †Paracravenoceras barnettense – type locality for species
 * †Paracravenoceras ozarkense
 * †Paraduplophyllum
 * †Paraduplophyllum amplexoides – type locality for species
 * †Paraduplophyllum multiplicatum – type locality for species
 * †Paraduplophyllum nealranchense – type locality for species
 * †Paraduplophyllum oppositum – type locality for species
 * †Paraduplophyllum tubaeformis – type locality for species
 * †Paraduplophyllum vermiculare – type locality for species
 * †Parafenestralia
 * †Parafenestralia gregalis – or unidentified comparable form
 * †Parafusulina
 * †Parafusulina amoena – type locality for species
 * †Paragastrioceras
 * †Paragastrioceras type locality for species – informal
 * †Paragoniozona
 * †Paragoniozona granulostriata
 * †Paragoniozona multilirata – or unidentified comparable form
 * †Paragoniozona nodolirata – or unidentified comparable form
 * †Paraheritschioides
 * †Paraheritschioides californiense
 * †Parahystricurus
 * †Parajuresania
 * †Parajuresania nebrascensis
 * †Paralegoceras
 * †Paralegoceras texanum – type locality for species
 * †Parallelodon
 * †Parallelodon multistriatus
 * †Paralleynia – tentative report
 * †Paralleynia acclinis – type locality for species
 * †Paramphicrinus
 * †Paranorella
 * †Paranorella aquilonia
 * †Paranorella comptula
 * †Paraparchites
 * †Paraparchites marathonensis – type locality for species
 * †Parapenascoceras
 * †Parapenascoceras sanandreasense
 * †Paraperrinites
 * †Paraperrinites subcumminsi – type locality for species
 * †Paraplethopeltis
 * †Parapolypora
 * †Parapolypora daurica – or unidentified comparable form
 * †Parapolypora novella – or unidentified comparable form
 * †Parapolypora sparsa – or unidentified related form
 * †Parareteograptus
 * †Paraschistoceras
 * †Paraschistoceras costiferum – type locality for species
 * †Paraschistoceras hildrethi
 * †Paraschistoceras reticulatum
 * †Paraschizodus
 * †Paraschizodus rothi – type locality for species
 * †Paraschwagerina
 * †Paraschwagerina shuleri – type locality for species
 * †Parashumardites
 * †Parashumardites fornicatus – type locality for species
 * †Parashumardites sellardsi – type locality for species
 * †Parashumardites senex
 * †Paraspiriferina
 * †Paraspiriferina amoena
 * †Paraspiriferina billingsi
 * †Paraspiriferina cellulana – type locality for species
 * †Paraspiriferina evax – type locality for species
 * †Paraspiriferina laqueata – type locality for species
 * †Paraspiriferina paginata
 * †Paraspiriferina pulchra
 * †Paraspiriferina rotundata – type locality for species
 * †Paraspiriferina sapinea
 * †Paraspiriferina setulosa
 * †Paraspiriferina sulcata
 * †Parauvanella
 * †Parauvanella minima
 * †Parenteletes
 * †Parenteletes cooperi
 * †Parenteletes superbus – type locality for species
 * †Pariotichus – type locality for genus
 * †Pariotichus brachyops – type locality for species
 * †Parioxys – type locality for genus
 * †Parioxys bolli – type locality for species
 * †Parioxys ferricolus – type locality for species
 * †Parulocrinus
 * †Parulocrinus americanus – type locality for species
 * Patella – tentative report
 * †Patellilabia
 * †Patellilabia junior – type locality for species
 * †Patellostium
 * †Patellostium ourayensis
 * †Paucipora
 * †Paucipora subborealis – or unidentified comparable form
 * †Paucispinifera
 * †Paucispinifera auriculata
 * †Paucispinifera comancheana – type locality for species
 * †Paucispinifera costellata – type locality for species
 * †Paucispinifera guadalupensis
 * †Paucispinifera indentata – type locality for species
 * †Paucispinifera intermedia
 * †Paucispinifera latidorsata
 * †Paucispinifera magnispina
 * †Paucispinifera parasulcata
 * †Paucispinifera quadrata – type locality for species
 * †Paucispinifera rara
 * †Paucispinifera rectangulata
 * †Paucispinifera spinosa
 * †Paucispinifera sulcata – type locality for species
 * †Paucispinifera suspecta
 * †Paucispinifera transversa – type locality for species
 * †Paucispinifera tumida
 * Pecopteris villosa.jpg †[[Pecopteris]]
 * †Pecopteris arborescens
 * †Pecopteris candolleana
 * †Pecopteris densifolia – tentative report
 * †Pecopteris grandifolia
 * †Pecopteris hemitelioides
 * †Pecopteris tenuinervis
 * †Pecopteris unita
 * †Pedanochiton – type locality for genus
 * †Pedanochiton discomptus – type locality for species
 * †Pedavis
 * †Pedavis biexoramus
 * †Pegmavalvula
 * †Pegmavalvula delicata – type locality for species
 * †Pegmavalvula gloveri – type locality for species
 * Pelodosotis1DB.jpg †[[Pelodosotis]] – type locality for genus
 * †Pelodosotis elongatum – type locality for species
 * †Peniculauris
 * †Peniculauris bassi
 * †Peniculauris costata – type locality for species
 * †Peniculauris imitata
 * †Peniculauris ivesi
 * †Peniculauris peniculifera
 * †Peniculauris subcostata – type locality for species
 * †Peniculauris transversa
 * †Penniretepora
 * †Pennoceras
 * †Pennoceras seamani – type locality for species
 * †Perimestocrinus
 * †Perimestocrinus excavatus – type locality for species
 * †Perimestocrinus moseleyi – type locality for species
 * †Peripetoceras
 * †Peripetoceras bridgeportense – type locality for species
 * †Peritrochia – type locality for genus
 * †Peritrochia erebus
 * †Permanomia
 * †Permanomia texana – type locality for species
 * †Permoconcha
 * †Permoconcha conica – type locality for species
 * †Permoconcha tabulata – type locality for species
 * †Permocorynella
 * †Permocorynella capitanense – type locality for species
 * †Permophorus
 * †Permophorus albequus
 * †Permophorus lunulus – type locality for species
 * †Permophorus mexicanus
 * †Permophricodothyris
 * †Permophricodothyris bullata – type locality for species
 * †Permophricodothyris cordata – type locality for species
 * †Pernopecten
 * †Pernopecten obliquus
 * †Pernopecten symmetricus
 * †Pernopecten yini
 * †Perrinites
 * †Perrinites gouldi – type locality for species
 * †Perrinites hilli – type locality for species
 * †Perrinites tardus – type locality for species
 * †Perrinites vidriensis
 * †Peruvispira
 * †Peruvispira delicata
 * Petalodus ohioensis fossil.jpg †[[Petalodus]]
 * †Petasmaia
 * †Petasmaia expansa
 * †Petasmatherus
 * †Petasmatherus depressus
 * †Petasmatherus mundus
 * †Petasmatherus nitidus – type locality for species
 * †Petasmatherus opulus – type locality for species
 * †Petasmatherus pumilus – type locality for species
 * †Petasmatherus pusillus
 * †Petasmatherus recticardinatus
 * †Petrocrania
 * †Petrocrania diabloensis – type locality for species
 * †Petrocrania exasperata
 * †Petrocrania modesta
 * †Petrocrania septifera – type locality for species
 * †Petrocrania teretis – type locality for species
 * †Phaneroceras
 * †Phaneroceras compressum
 * †Phaneroceras lenticulare – type locality for species
 * †Phanerotrema – tentative report
 * †Pharkidonotus
 * †Pharkidonotus harrodi
 * †Pharkidonotus megalius – or unidentified related form
 * †Pharkidonotus percarinatus
 * †Pharkidonotus westi – type locality for species
 * †Phasmatocycas
 * †Phasmatocycas spectabilis – type locality for species
 * †Phestia
 * †Phestia bellistriata
 * †Philhedra
 * Phlegethontia.jpg †[[Phlegethontia]] – tentative report
 * †Phonerpeton
 * †Phonerpeton pricei – type locality for species
 * †Phonerpeton whitei – type locality for species
 * †Phrenophoria
 * †Phrenophoria anterocostata
 * †Phrenophoria bicostata
 * †Phrenophoria compressa
 * †Phrenophoria corpulenta
 * †Phrenophoria depressa
 * †Phrenophoria incomitata
 * †Phrenophoria irregularis
 * †Phrenophoria nesiotes
 * †Phrenophoria nudumbona – type locality for species
 * †Phrenophoria pentagonalis – type locality for species
 * †Phrenophoria perplexa
 * †Phrenophoria pinguiformis
 * †Phrenophoria pinguis – type locality for species
 * †Phrenophoria planifrons
 * †Phrenophoria planiventra
 * †Phrenophoria repugnans
 * †Phrenophoria subcarinata – type locality for species
 * †Phrenophoria ventricosa – type locality for species
 * †Phrenophoria vetula
 * †Phricodothyris
 * †Phricodothyris catatona
 * †Phricodothyris guadalupensis
 * †Phymatopleura
 * †Phymatopleura brazoensis
 * †Phymatopleura nodosa
 * †Pileochiton – type locality for genus
 * †Pileochiton cancellus – type locality for species
 * †Pileolites – type locality for genus
 * †Pileolites baccatus – type locality for species
 * †Piloceras
 * †Pinnularia
 * †Pintoceras – type locality for genus
 * †Pintoceras postvenatum – type locality for species
 * †Pirasocrinus
 * †Pirasocrinus invaginatus – type locality for species
 * †Pithodea
 * †Pithodea tornatilis – or unidentified comparable form
 * Plaesiomyiidae - Plesiomys subquadrata.JPG †[[Plaesiomys]]
 * †Plaesiomys bellistriatus
 * †Plaesiomys subquadrata
 * †Plagioglypta
 * †Plagioglypta annulostriata
 * †Plagioglypta girtyi
 * †Plagiostoma – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Plagiostoma deltoideum
 * †Planispina
 * †Planispina conida
 * †Planotectus
 * †Planotectus cymbellatus – type locality for species
 * †Platyceras
 * Platyhystrix BW.jpg †[[Platyhystrix]] – or unidentified comparable form
 * †Platysaccus
 * †Platysaccus papilionis
 * †Platysaccus saarensis
 * †Platyzona
 * †Platyzona anguispira – type locality for species
 * †Platyzona cancellata – type locality for species
 * †Platyzona pagoda – type locality for species
 * †Platyzona rotunda
 * †Plaxocrinus
 * †Plaxocrinus laxus – type locality for species
 * †Plaxocrinus oeconomicus – type locality for species
 * †Plectelasma
 * †Plectelasma dubium
 * †Plectelasma guadalupense
 * †Plectelasma kingi
 * †Plectelasma nitidum
 * †Plectelasma planidorsatum
 * †Plectospira
 * †Plectospira problematica
 * †Plectronoceras
 * †Plectronoceras exile – type locality for species
 * †Plerodiffia – type locality for genus
 * †Plerodiffia eaglebuttensis – type locality for species
 * †Plethospira
 * †Plethospira rotunda – type locality for species
 * †Pleurelasma
 * †Pleurelasma costatum
 * Tainoceratidae - Pleuronautilus mariani.JPG †[[Pleuronautilus]]
 * †Pleuronautilus cooperi – type locality for species
 * †Pleuronautilus gregarius – type locality for species
 * †Pleuronautilus megaporus – type locality for species
 * †Pleuronautilus mutatus – type locality for species
 * †Pleuronautilus praecursor
 * †Pleuronautilus shumardianus
 * †Pleurophorus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Pleurophorus delawarensis – type locality for species
 * †Pleurophorus occidentalis
 * Pleurotomaria.jpg [[Pleurotomaria]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Pleurotomaria arenaria – type locality for species
 * †Pleurotomaria carinifera – type locality for species
 * †Pleurotomaria discoidea – type locality for species
 * †Pleurotomaria elderi – type locality for species
 * †Pleurotomaria halliana – type locality for species
 * †Pleurotomaria mica – type locality for species
 * †Pleurotomaria neglecta – type locality for species
 * †Pleurotomaria perornata – type locality for species
 * †Pleurotomaria planulata – type locality for species
 * †Pleurotomaria proutiana – type locality for species
 * †Pleurotomaria putilla
 * †Pleurotomaria richardsoni – type locality for species
 * †Plicochonetes
 * †Plicochonetes ornatus – or unidentified comparable form
 * †Plummeroceras
 * †Plummeroceras plummeri – type locality for species
 * †Poacordaites
 * †Poacordaites tenuifolius – or unidentified comparable form
 * †Podozamites
 * †Poikilosakos
 * †Poikilosakos informis
 * †Poikilosakos petaloides
 * †Polidevcia
 * †Polidevcia bellistriata
 * †Polyacrodus
 * †Polyacrodus lapalomensis – type locality for species
 * †Polyacrodus ritchiei – type locality for species
 * †Polyacrodus wichitaensis
 * †Polyacrodus zideki – type locality for species
 * †Polydiexodina
 * †Polydiexodina shumardi
 * †Polylophidium – type locality for genus
 * †Polylophidium discus – type locality for species
 * †Polymorpharia
 * †Polymorpharia polymorpha
 * †Polypora
 * †Polypora andina
 * †Polypora balkhaschensiformis
 * †Polypora bassleri – or unidentified related form
 * †Polypora crassa – or unidentified comparable form
 * †Polypora darashamensis – or unidentified comparable form
 * †Polypora elliptica – or unidentified related form
 * †Polypora fujimotoi – or unidentified related form
 * †Polypora halliana – or unidentified related form
 * †Polypora hirsuta
 * †Polypora hivatchensis – or unidentified related form
 * †Polypora irregularis – or unidentified comparable form
 * †Polypora keyserlingi – or unidentified related form
 * †Polypora mexicana
 * †Polypora nodocarinata
 * †Polypora soyanensis
 * †Polypora virga – or unidentified comparable form
 * †Polypora vitiosa – or unidentified related form
 * †Polyporella
 * †Polyporella perturbata
 * †Polyporella ulakhanensis – or unidentified comparable form
 * †Polysiphon – type locality for genus
 * †Polysiphon mirabilis – type locality for species
 * †Polysiphonaria – type locality for genus
 * †Polysiphonaria flabellata – type locality for species
 * †Polysiphonaria flabellatum
 * †Pontisia
 * †Pontisia costata
 * †Pontisia franklinensis
 * †Pontisia kingi – type locality for species
 * †Pontisia longicosta
 * †Pontisia magnicostata
 * †Pontisia nanas
 * †Pontisia parva
 * †Pontisia robusta
 * †Pontisia stehlii – type locality for species
 * †Pontisia truncata
 * †Pontisia ventricola
 * †Pontisia wolfcampensis
 * †Popanoceras
 * †Popanoceras walcotti – type locality for species
 * †Posidonia
 * †Pragnellia
 * †Pragnellia delicatula – type locality for species
 * †Prehoffmannia – type locality for genus
 * †Prehoffmannia milleri – type locality for species
 * †Preperonidella
 * †Preperonidella delicata
 * †Preperonidella rigbyi
 * †Preshumardites
 * †Preshumardites gaptankensis
 * †Preshumardites illinoisensis
 * †Preshumardites stainbrooki – type locality for species
 * Priscopedatus
 * †Priscopedatus bullatus – type locality for species
 * †Priscopedatus buno – type locality for species
 * †Priscopedatus radiatus – type locality for species
 * †Priscopedatus stellatus – type locality for species
 * †Procostatoria – type locality for genus
 * †Procostatoria cooperi
 * †Procostatoria gloveri – type locality for species
 * †Procostatoria sexaradiata
 * †Procostatoria sexradiata
 * †Prodentalium
 * †Prodentalium canna
 * †Prodentalium raymondi
 * †Productina
 * †Productina sampsoni
 * †Productus
 * †Productus calhounianus – tentative report
 * †Productus hermosanus
 * †Productus mexicanus – type locality for species
 * †Productus norwoodii – tentative report
 * †Productus semistriatus
 * †Progyrolepis
 * †Progyrolepis tricessimalaris – type locality for species
 * †Properrinites
 * †Properrinites bakeri
 * †Properrinites boesei – type locality for species
 * †Properrinites type locality for species – informal
 * †Propinacoceras
 * †Proplina
 * †Propopanoceras
 * †Propopanoceras postsimense
 * †Prorichthofenia
 * †Proshumardites
 * †Proshumardites primus
 * †Prostacheoceras
 * †Prostacheoceras skinneri – type locality for species
 * †Prostacheoceras type locality for species – informal
 * †Prothalassoceras
 * †Prothalassoceras caddoense – type locality for species
 * †Prothalassoceras kingorum
 * †Prothalassoceras welleri – type locality for species
 * †Protocaptorhinus – type locality for genus
 * †Protocaptorhinus pricei – type locality for species
 * †Protoretepora
 * †Protoretepora ampla – or unidentified comparable form
 * †Protorothyris – type locality for genus
 * †Protorothyris archeri – type locality for species
 * †Protowentzelella
 * †Protowentzelella cystosa
 * †Protowentzelella kunthi
 * †Protrete – type locality for genus
 * †Protrete texanus – type locality for species
 * †Protrochiscolithus
 * †Protrochiscolithus alemanensis – type locality for species
 * †Prouddenites
 * †Prouddenites primus – type locality for species
 * Reconstruction of Psaronius.jpg †[[Psaronius]]
 * †Pseudagnostus
 * †Pseudagnostus nordicus
 * †Pseudoalbaillella
 * †Pseudoalbaillella cona – type locality for species
 * †Pseudoalbaillella fusiformis – or unidentified related form
 * †Pseudoalbaillella globosus
 * †Pseudoalbaillella scalprata
 * †Pseudodielasma – type locality for genus
 * †Pseudodielasma brilli
 * †Pseudodielasma gibberum
 * †Pseudodielasma globulum
 * †Pseudodielasma lobatum
 * †Pseudodielasma magnum
 * †Pseudodielasma minor
 * †Pseudodielasma ovatum – type locality for species
 * †Pseudodielasma perplexa – type locality for species
 * †Pseudodielasma pingue
 * †Pseudodielasma pinyonense
 * †Pseudodielasma plicatum
 * †Pseudodielasma scutulatum – type locality for species
 * †Pseudodielasma subcirculare
 * †Pseudodielasma sulcatum
 * †Pseudofusulina
 * †Pseudofusulina powwowensis
 * †Pseudogastrioceras
 * †Pseudogastrioceras texanum – type locality for species
 * †Pseudohystricurus
 * †Pseudoleptodus – type locality for genus
 * †Pseudoleptodus annosus
 * †Pseudoleptodus conicus
 * †Pseudoleptodus cucullatus
 * †Pseudoleptodus getawayensis – type locality for species
 * †Pseudoleptodus giganteus
 * †Pseudoleptodus grandis
 * †Pseudoleptodus granulosus
 * †Pseudoleptodus guadalupensis – type locality for species
 * †Pseudoleptodus lepidus
 * †Pseudoleptodus nodosus
 * †Pseudoleptodus primitivus
 * Pseudomelania shell cropped.png †[[Pseudomelania]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Pseudomonotis
 * †Pseudomonotis acinetus
 * †Pseudomonotis hawni
 * †Pseudomonotis likharevi
 * †Pseudomonotis speluncaria – tentative report
 * †Pseudomonotis sublaevis
 * †Pseudooneotodus
 * †Pseudooneotodus beckmanni
 * †Pseudooneotodus bicornis
 * †Pseudooneotodus linguicornis
 * †Pseudoparalegoceras
 * †Pseudoparalegoceras bellilineatum
 * †Pseudoparalegoceras brazoense – type locality for species
 * †Pseudopronorites
 * †Pseudopronorites arkansiensis
 * †Pseudopronorites llanoensis – type locality for species
 * †Pseudorthoceras
 * †Pseudorthoceras knoxense
 * †Pseudoschwagerina
 * †Pseudoschwagerina beedei
 * †Pseudoschwagerina geiseri
 * †Pseudoschwagerina gerontica
 * †Pseudoschwagerina uddeni
 * †Pseudovidrioceras
 * †Pseudovidrioceras dunbari
 * †Pseudovirgula – type locality for genus
 * †Pseudovirgula tenuis – type locality for species
 * †Pseudovoltzia
 * †Pseudovoltzia liebeana
 * †Pseudowannerophyllum
 * †Pseudowannerophyllum solidum – type locality for species
 * †Pseudozaphrentoides
 * †Pseudozaphrentoides ordinatus – type locality for species
 * †Pseudozygopleura
 * †Pseudozygopleura belli – type locality for species
 * †Pseudozygopleura moorei
 * †Pseudozygopleura multicostata
 * †Pseudozygopleura obtusicacuminis
 * †Pseudozygopleura scitula
 * †Pseudozygopleura type locality for species – informal
 * †Psilocamara – type locality for genus
 * †Psilocamara hesperia
 * †Psilocamara renfroarum – type locality for species
 * Pteria – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Pteria richardsoni
 * †Pteria squamifera – type locality for species
 * †Pterinopectinella
 * †Pterinopectinella spinifera
 * †Pterocephalia
 * †Pterochiton
 * †Pterochiton newelli – type locality for species
 * †Pterochiton spatulatus
 * †Pterochiton texanus – type locality for species
 * †Pteronites
 * †Ptilotorhynchus
 * †Ptilotorhynchus delicatum
 * †Ptychocarpus
 * †Ptygmactrum – type locality for genus
 * †Ptygmactrum acutum
 * †Ptygmactrum angulatum
 * †Ptygmactrum depressum
 * †Ptygmactrum extensum – type locality for species
 * †Ptygmactrum mordicum
 * †Ptygmactrum spiculatum – type locality for species
 * †Pudoproetus
 * †Pudoproetus chappelensis
 * †Pugnax
 * †Pugnax osagensis
 * †Pugnoides
 * †Pugnoides bidentatus
 * †Pugnoides elegans
 * †Pugnoides shumardianus
 * †Pugnoides swallovianus
 * †Pugnoides texanus
 * †Pulchratia
 * †Pulchratia symmetricus
 * †Pulchrilamina
 * †Pulchrilamina spinosa
 * †Pulsatospongia – type locality for genus
 * †Pulsatospongia obconica – type locality for species
 * †Punctospirifer
 * †Punctospirifer billingsii
 * †Punctospirifer kentuckensis
 * †Pustula
 * †Pustula semipunctata

Q

 * †Quadratia
 * †Quadratia egregia – type locality for species
 * †Quadrochonetes
 * †Quadrochonetes girtyi – type locality for species
 * †Quadrochonetes praecursor
 * †Quasicaecilia – type locality for genus
 * †Quasicaecilia texana – type locality for species

R

 * †Radiotrabeculopora
 * †Radiotrabeculopora virga – type locality for species
 * †Rallacosta
 * †Rallacosta actina
 * †Rallacosta imporcata
 * †Rallacosta laminata
 * †Rallacosta xystica
 * †Ramavectus
 * †Ramavectus diabloensis
 * †Ramipora
 * †Ramipora hochstetteri – or unidentified related form
 * †Ramosothalamiella – type locality for genus
 * †Ramosothalamiella divaricata – type locality for species
 * †Rananasus
 * †Raphistomina
 * †Rasettia
 * †Rasettia capax – or unidentified comparable form
 * †Rauserella
 * †Rauserella erratica
 * †Rayonnoceras
 * †Rayonnoceras huecoense – type locality for species
 * †Rectograptus
 * †Rectograptus amplexicaulis
 * †Regrantia
 * †Regrantia linoproductiformis
 * †Reiszorhinus – type locality for genus
 * †Reiszorhinus olsoni – type locality for species
 * †Renalcis
 * Ammonia tepida.jpg †[[Retaria]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Retaria leplayi – tentative report
 * †Reteporidra
 * †Reteporidra orientalis – or unidentified comparable form
 * †Retichonetes – tentative report
 * †Retichonetes gibberulus – type locality for species
 * †Reticularia
 * †Reticularia cooperensis
 * †Reticulariina
 * †Reticulariina bufala
 * †Reticulariina cerina – type locality for species
 * †Reticulariina craticula
 * †Reticulariina echinata
 * †Reticulariina girtyi
 * †Reticulariina hueconiana – type locality for species
 * †Reticulariina impressa
 * †Reticulariina laxa
 * †Reticulariina newelli
 * †Reticulariina phoxa
 * †Reticulariina powwowensis
 * †Reticulariina pristina – type locality for species
 * †Reticulariina pusilla
 * †Reticulariina roscida
 * †Reticulariina senticosa
 * †Reticulariina strigosa
 * †Reticulariina subulata
 * †Reticulariina tetrica
 * †Reticulariina venustula
 * †Reticulariina welleri
 * †Reticulatia
 * †Reticulatia americana
 * †Reticulatia huecoensis – type locality for species
 * †Reticulatia robusta
 * †Retispira
 * †Retispira bellireticulata
 * †Retispira fragilis – type locality for species
 * †Retispira kansasensis
 * †Retispira lyelli – type locality for species
 * †Retispira meekiana
 * †Retispira modesta
 * †Retispira texana – type locality for species
 * †Rhabdiferoceras
 * †Rhabdomeson
 * †Rhabdomeson bellum
 * †Rhabdotocochlis
 * †Rhabdotocochlis type locality for species – informal
 * †Rhamnaria – type locality for genus
 * †Rhamnaria eximia
 * †Rhamnaria grandis
 * †Rhamnaria kingorum – type locality for species
 * †Rhamnaria rectangulata
 * †Rhamnaria shumardi
 * †Rhamnaria sulcata
 * †Rhamnaria tenuispinosa – type locality for species
 * †Rhamnaria vinnula
 * †Rhipidomella
 * †Rhipidomella carbonaria
 * †Rhipidomella hessensis – type locality for species
 * †Rhipidomella hispidula – type locality for species
 * †Rhipidomella miscella
 * †Rhipidomella perminuta
 * †Rhombopora
 * †Rhombopora lepidodendroides
 * Rhynchonellidae - Rhynchonella species.JPG †[[Rhynchonella]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Rhynchonella guadalupae – type locality for species
 * †Rhynchonella texana
 * †Rhynchopora
 * †Rhynchopora dossena
 * †Rhynchopora guadalupensis
 * †Rhynchopora hebetata
 * †Rhynchopora illinoisensis
 * †Rhynchopora molina – type locality for species
 * †Rhynchopora palumbula – type locality for species
 * †Rhynchopora patula
 * †Rhynchopora sansabensis – type locality for species
 * †Rhynchopora sphenoides
 * †Rhynchopora taylori
 * †Rhynchopora tenera
 * †Rhynchotrema
 * †Rhynchotrema iowense
 * †Rhytiophora
 * †Rhytiophora blairi – or unidentified comparable form
 * †Rhytiophora calhounensis
 * †Rhytisia
 * †Rhytisia rugosa
 * †Ribeiria
 * †Ribeiria calcifera
 * †Richardsonites
 * †Richardsonites richardsonianus
 * †Rigbyella
 * †Rigbyella girtyi – type locality for species
 * †Rigrantia
 * †Rigrantia costella
 * †Rigrantia hessensis – type locality for species
 * †Rigrantia planumbona
 * †Rigrantia regularis
 * †Rioceras
 * †Rioceras dartoni – type locality for species
 * †Rioceras tubulare – type locality for species
 * †Rioceras wellsi – type locality for species
 * †Roadoceras
 * †Roadoceras beedei – type locality for species
 * †Roadoceras roadense – type locality for species
 * †Roemerella
 * †Roemerella gigantissima – type locality for species
 * †Romeria – type locality for genus
 * †Romeria prima – type locality for species
 * †Romeria texana – type locality for species
 * †Rota
 * †Rota martini
 * †Rotaia
 * †Rothianiscus – type locality for genus
 * †Rothianiscus multidonta – type locality for species
 * †Roundyella
 * †Roundyella dorsopapillosa – type locality for species
 * Rubeostratilia texensis.jpg †[[Rubeostratilia]] – type locality for genus
 * †Rubeostratilia texensis – type locality for species
 * †Rugaria
 * †Rugaria crassa
 * †Rugaria hessensis – type locality for species
 * †Rugaria molengraaffi – tentative report
 * †Rugatia
 * †Rugatia convexa
 * †Rugatia incurva
 * †Rugatia incurvata – type locality for species
 * †Rugatia mckeei
 * †Rugatia occidentalis
 * †Rugatia paraindica
 * †Rugosochonetes
 * †Rugosochonetes burlingtonensis
 * †Russellites
 * †Russellites taeniata
 * †Ruthenoceras – report made of unidentified related form or using admittedly obsolete nomenclature

S

 * †Saffordophyllum
 * †Saffordophyllum newcombae – type locality for species
 * †Sagenodus
 * †Sagittoceras – tentative report
 * †Sagittoceras hathawayanum – or unidentified comparable form
 * †Sallya
 * †Sallya bicincta
 * †Sallya linsa – type locality for species
 * †Sallya striata – type locality for species
 * †Salvadorea
 * †Salvadorea kingae
 * †Samaropsis
 * †Sandolasma – tentative report
 * †Sandolasma cooperi – type locality for species
 * †Sandrewia – type locality for genus
 * †Sandrewia texana – type locality for species
 * †Sanniolus – type locality for genus
 * †Sanniolus sigmoides – type locality for species
 * †Saportaea – tentative report
 * †Sarganostega
 * †Sarganostega murata
 * †Sarganostega pressa
 * †Sarganostega prisca
 * †Sarganostega pyramidalis – type locality for species
 * †Sarganostega transversalis
 * Sauropleura cropped.jpg †[[Sauropleura]]
 * †Sauropleura bairdi – type locality for species
 * †Scacchinella
 * †Scacchinella americana
 * †Scacchinella exasperata – type locality for species
 * †Scacchinella gigantea
 * †Scacchinella primitiva
 * †Scacchinella titan – type locality for species
 * †Scacchinella triangulata – type locality for species
 * †Scaldia
 * †Scapanops – type locality for genus
 * †Scapanops neglecta – type locality for species
 * †Scapharina
 * †Scapharina levis
 * †Scapharina quadrata
 * †Scapharina rugosa
 * †Sceletonia
 * †Sceletonia crassa
 * †Scenesia
 * †Scenesia extensa
 * †Schaefferichthys – type locality for genus
 * †Schaefferichthys leudersensis – type locality for species
 * †Scheiella – type locality for genus
 * †Scheiella thesaurium – type locality for species
 * †Scheiia
 * †Scheiia tuberosa
 * †Schematochiton
 * †Schematochiton arthurcooperi
 * †Schistoceras
 * †Schistoceras missouriense – type locality for species
 * †Schizodus
 * †Schizodus canalis
 * †Schizodus ovatus
 * †Schizodus securus – type locality for species
 * †Schizodus supaiensis
 * †Schizodus texanus – type locality for species
 * †Schizodus ulrichi – or unidentified comparable form
 * †Schizodus wyomingensis
 * †Schizograptus
 * †Schizopea
 * †Schizophoria
 * †Schubertella
 * †Schubertella kingi
 * †Schuchertella – tentative report
 * †Schuchertella subvexa
 * †Schwagerina
 * †Schwagerina bellula
 * †Schwagerina crassitectoria
 * †Schwagerina davisi
 * †Schwagerina diversiformis
 * †Schwagerina emaciata
 * †Schwagerina eolata
 * †Schwagerina franklinensis
 * †Schwagerina grandensis – or unidentified related form
 * †Schwagerina huecoensis
 * †Schwagerina knighti
 * †Schwagerina menziesi – type locality for species
 * †Schwagerina nelsoni
 * †Schwagerina neolata
 * †Schwagerina thompsoni – tentative report
 * †Schyroconcha
 * †Schyroconcha spinosa – or unidentified related form
 * Secodontosaurus obtus1DB.jpg †[[Secodontosaurus]]
 * †Secodontosaurus obtusidens – type locality for species
 * †Secodontosaurus willistoni – type locality for species
 * †Sedenticellula
 * †Sedenticellula sacra
 * †Sedgwickia
 * †Sedgwickia topekaensis
 * †Sellardsicrinus – tentative report
 * †Semipetasus – type locality for genus
 * †Semipetasus signatus – type locality for species
 * †Septimyalina
 * †Septimyalina burmai
 * †Septimyalina perattenuata
 * †Septopora
 * †Septopora biserialis – or unidentified comparable form
 * †Septopora blanda – or unidentified comparable form
 * †Septopora cestriensis – or unidentified comparable form
 * †Septopora flabellata – or unidentified comparable form
 * †Septopora lineata – or unidentified related form
 * †Septopora orientalis
 * †Septopora pinnata – or unidentified related form
 * †Septopora quasiorientalis – or unidentified comparable form
 * †Septopora robusta – or unidentified related form
 * †Septopora spinulosa – or unidentified related form
 * Serpula – tentative report
 * †Sestropoma
 * †Sestropoma cribriferum
 * Seymouria1.jpg   †[[Seymouria]] – type locality for genus
 * †Seymouria baylorensis – type locality for species
 * †Shamovella
 * †Shansiella
 * †Shansiella beckwithana
 * †Shansiella carbonaria
 * †Shouchangoceras
 * †Shouchangoceras americanum – type locality for species
 * †Shumardella
 * †Shumardella obsolescens
 * †Shumardites
 * †Shumardites cuyleri – type locality for species
 * †Shumardites simondsi
 * †Shwedagonia
 * †Shwedagonia elegans – type locality for species
 * Stanhope Tree - geograph.org.uk - 2531669.jpg †[[Sigillaria]]
 * †Sigillaria brardii
 * †Sigillariostrobus
 * †Sigillariostrobus hastatus
 * †Simplicarina
 * †Simplicarina incompta
 * †Sinuella – type locality for genus
 * †Sinuella minuta – type locality for species
 * †Sinuopea
 * †Sinuopea humerosa
 * †Sinuopea vera
 * †Siphonosia
 * †Siphonosia alleni
 * †Skinnerella
 * †Skinnerella biconica – type locality for species
 * †Skinnerella brevis – type locality for species
 * †Skinnerella cylindrica – type locality for species
 * †Skinnerella diabloensis
 * †Skinnerella formosa – type locality for species
 * †Skinnerella magna – type locality for species
 * †Skinnerella robusta – type locality for species
 * †Skinnerella schucherti
 * †Skinnerella speciosa – type locality for species
 * †Skinnerella tenuis – type locality for species
 * †Skinnerina
 * †Skinnerina fusiformis – type locality for species
 * †Skinnerina mildredae – type locality for species
 * †Skinnerina rotundata – type locality for species
 * †Slaugenhopia – type locality for genus
 * †Slaugenhopia texensis – type locality for species
 * †Soleachiton – type locality for genus
 * †Soleachiton yochelsoni – type locality for species
 * Solemya elarraichensis holotype.jpg [[Solemya]] – tentative report
 * †Soleniscus
 * †Soleniscus diminutus – type locality for species
 * †Soleniscus girtyi – type locality for species
 * †Soleniscus primigenius
 * †Soleniscus primogenius
 * †Soleniscus regularis
 * †Soleniscus texanus – type locality for species
 * †Soleniscus typicus
 * †Soleniscus variabilis
 * †Solenochilus
 * †Solenochilus kempae – type locality for species
 * †Solenopora
 * †Solenopora texana
 * †Sollasia
 * †Sollasia ostiolata
 * †Sollasiella – type locality for genus
 * †Sollasiella reticulata – type locality for species
 * †Sowburia
 * †Sowburia texana – type locality for species
 * †Spermatodus
 * †Spermatodus pustulosus
 * Sphenacanthus1DB.jpg †[[Sphenacanthus]]
 * †Sphenophyllum
 * †Sphenophyllum oblongifolium
 * †Sphenophyllum obovatum
 * †Sphenopteris
 * †Sphenopteris macilenta – or unidentified comparable form
 * †Spica
 * †Spica texana – type locality for species
 * †Spinarella
 * †Spinarella costellata
 * †Spinarella lobata
 * †Spinarella paulula
 * †Spinarella perfecta
 * †Spinifrons
 * †Spinifrons delicatula
 * †Spinifrons magna
 * †Spinifrons quadrata
 * †Spinofenestella
 * †Spinofenestella spinulosa – or unidentified related form
 * †Spinomarginifera – or unidentified comparable form
 * Spirifer perlamosus pedunculate valve.jpg †[[Spirifer]]
 * †Spirifer chappelensis – type locality for species
 * †Spirifer gregeri – or unidentified comparable form
 * †Spirifer guadalupensis – type locality for species
 * †Spirifer rockymontanus
 * †Spiriferella
 * †Spiriferella calcarata
 * †Spiriferella clypeata
 * †Spiriferella embrithes
 * †Spiriferella gloverae
 * †Spiriferella gravis – type locality for species
 * †Spiriferella levis – type locality for species
 * †Spiriferella propria
 * †Spiriferella sulcifer – type locality for species
 * †Spiriferellina
 * †Spiriferellina hilli – type locality for species
 * †Spiriferellina nasuta
 * †Spiriferellina nuda
 * †Spiriferellina paucicostata – type locality for species
 * †Spiriferellina tricosa – type locality for species
 * †Spiriferellina vescula
 * †Spiriferinaella
 * †Spiriferinaella limata
 * †Spiriferinaella medialis
 * †Spiriferinaella scalpata – type locality for species
 * Spirorbis spirorbis Scotland.jpg [[Spirorbis]]
 * †Spirorbis carbonarius – or unidentified comparable form
 * †Spiroscala – type locality for genus
 * †Spiroscala pagoda – type locality for species
 * †Spiroscala pulchra – type locality for species
 * †Spuriosa
 * †Spuriosa circularis
 * †Spyridiophora
 * †Spyridiophora compacta
 * †Spyridiophora distincta – type locality for species
 * †Spyridiophora reticulata – type locality for species
 * †Stacheoceras
 * †Stacheoceras gilliamense – type locality for species
 * †Staffella
 * †Staffella lacunosa
 * †Stearoceras
 * †Stearoceras conchiferum
 * †Stearoceras gibbosum – or unidentified related form
 * †Stearoceras militarium – type locality for species
 * †Stearoceras simplex – type locality for species
 * †Stegochiton – type locality for genus
 * †Stegochiton coxi – type locality for species
 * †Stegochiton onerosus – type locality for species
 * †Stegocoelia
 * †Stegocoelia copei
 * †Stegocoelia crenulata
 * †Stegocoelia dozierensis – type locality for species
 * †Stegocoelia missouriensis
 * †Stellarocrinus
 * †Stellarocrinus texani – type locality for species
 * †Stenocoelia
 * †Stenodiscus – tentative report
 * †Stenoglaphyrites
 * †Stenoglaphyrites incisus
 * †Stenolobulites
 * †Stenolobulites admiralensis – type locality for species
 * †Stenolobulites depressus – type locality for species
 * †Stenolobulites stenolobulus – type locality for species
 * †Stenolobulites subglobosus – type locality for species
 * †Stenolobulites type locality for species – informal
 * †Stenopoceras
 * †Stenopoceras inexpectans – type locality for species
 * †Stenopoceras whitei – type locality for species
 * †Stenopora
 * †Stenopora granulosa – type locality for species
 * †Stenopora richardsoni
 * †Stenopronorites
 * †Stenoscisma
 * †Stenoscisma abbreviatum
 * †Stenoscisma aberrans
 * †Stenoscisma amoenum
 * †Stenoscisma aptatum
 * †Stenoscisma bellatulum
 * †Stenoscisma bonum
 * †Stenoscisma calvatum
 * †Stenoscisma camurum
 * †Stenoscisma doricranum
 * †Stenoscisma exutum
 * †Stenoscisma fabarium
 * †Stenoscisma hadrum – type locality for species
 * †Stenoscisma hueconianum – type locality for species
 * †Stenoscisma inaequale – type locality for species
 * †Stenoscisma indentata
 * †Stenoscisma kalum
 * †Stenoscisma levicostum
 * †Stenoscisma maniculum
 * †Stenoscisma multicostum
 * †Stenoscisma myioides
 * †Stenoscisma oblisum
 * †Stenoscisma pansum
 * †Stenoscisma peneleve
 * †Stenoscisma problematicum
 * †Stenoscisma pyraustoides – type locality for species
 * †Stenoscisma renode – type locality for species
 * †Stenoscisma repigratum
 * †Stenoscisma schlotheimi – tentative report
 * †Stenoscisma thevenini
 * †Stenoscisma trabeatum
 * †Stenoscisma triquetrum
 * †Stenoscisma venustum
 * †Stephanozyga
 * †Stephanozyga subnodosa
 * Steppesaurus1DB.jpg †[[Steppesaurus]] – type locality for genus
 * †Steppesaurus gurleyi – type locality for species
 * †Stereodictyum – type locality for genus
 * †Stereodictyum orthoplectum – type locality for species
 * †Stereophallodon – type locality for genus
 * †Stereophallodon ciscoensis – type locality for species
 * †Stereostylus
 * †Stereostylus adelus – type locality for species
 * †Stethacanthulus
 * †Stethacanthulus decorus
 * †Stethacanthulus meccaensis
 * Steth pair1 cropped.jpg †[[Stethacanthus]]
 * †Stethacanthus meccaensis
 * †Stewartina
 * †Stewartina convexa
 * †Stewartina texana
 * †Stioderma – type locality for genus
 * †Stioderma coscinum – type locality for species
 * †Straparollus
 * †Straparollus savagei
 * †Stratispongia – type locality for genus
 * †Stratispongia cinctuta
 * †Streblochondria
 * †Streblochondria sculptilis
 * †Streblopteria
 * †Streblopteria montpelierensis
 * †Streblotrypa
 * †Strepsodiscus
 * †Strepsodiscus paucivoluta
 * †Streptacis
 * †Streptacis inflata – type locality for species
 * †Streptacis permiana – type locality for species
 * †Streptacis piercei – type locality for species
 * †Streptacis type locality for species – informal
 * †Streptacis whitfieldi
 * †Streptelasma
 * †Streptelasma divaricans
 * †Streptorhynchus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Streptorhynchus shumardianus – tentative report
 * †Striatites
 * †Striatites richteri
 * †Striatosaccites
 * †Striatosaccites bullaeformis – type locality for species
 * †Striatosaccites perisporites – type locality for species
 * †Striatosaccites Type A – informal
 * †Strigigenalis
 * †Strigirhynchia
 * †Strigirhynchia elongata
 * †Strigirhynchia indentata – type locality for species
 * †Strigirhynchia transversa
 * †Strigogoniatites
 * †Strigogoniatites fountaini – type locality for species
 * †Strobeus
 * †Strobeus brevis
 * †Strobeus delawarensis – type locality for species
 * †Strobeus paludinaeformis
 * †Strobeus poromus
 * †Stromatidium – type locality for genus
 * †Stromatidium typicale – type locality for species
 * †Strophalosia
 * †Strophella
 * †Strophella grandaevus
 * Strophomena costellata brachial.jpg †[[Strophomena]]
 * †Strophomena neglecta
 * †Stuartwellercrinus
 * †Stuartwellercrinus symmetricus – type locality for species
 * †Stuartwellercrinus texanus – type locality for species
 * †Stuartwellercrinus turbinatus – type locality for species
 * †Stutchburia
 * †Subkargalites
 * †Subkargalites hargisi – type locality for species
 * †Subkargalites parkeri
 * †Subperrinites
 * †Subperrinites bakeri – type locality for species
 * †Subperrinites denhami – type locality for species
 * †Subperrinites mooreae – type locality for species
 * †Sulcataria
 * †Sulcataria compacta
 * †Sulcataria latisulcata
 * †Svetlanoceras
 * †Svetlanoceras moylei – type locality for species
 * †Symphysurina
 * †Syngastrioceras
 * †Syngastrioceras globulosum
 * †Syngastrioceras scotti
 * †Synocladia
 * †Syntrophina
 * †Syntrophinella
 * †Syringoclemis – tentative report
 * Syringoporid.jpg †[[Syringopora]] – tentative report

T

 * †Tabulipora
 * †Tabulipora carbonaria
 * †Taenicephalus
 * †Taeniopteris
 * †Taeniopteris abnormis
 * †Taeniopteris coriacea – tentative report
 * †Taeniopteris eckardtii
 * †Taeniopteris multinervis
 * †Taeniopters
 * †Tainoceras
 * †Tainoceras clydense – type locality for species
 * †Taphrosestria
 * †Taphrosestria expansa
 * †Taphrosestria peculiaris
 * †Tapinotomaria
 * †Tapinotomaria coronata – type locality for species
 * †Tapinotomaria costata – type locality for species
 * †Tapinotomaria crassa – type locality for species
 * †Tapinotomaria duplicostata – type locality for species
 * †Tapinotomaria globosa – type locality for species
 * †Tapinotomaria mirabilis – type locality for species
 * †Tapinotomaria pyramidalis – type locality for species
 * †Tapinotomaria rugosa – type locality for species
 * †Tapinotomaria submirabilis – type locality for species
 * †Tappenosaurus – type locality for genus
 * †Tappenosaurus magnus – type locality for species
 * †Tarphyceras
 * †Tarphyceras chadwickense
 * †Tarthinia
 * †Tautosia
 * †Tautosia angulata
 * †Tautosia distorta
 * †Tautosia elegans
 * †Tautosia expansa
 * †Tautosia fastigiata
 * †Tautosia galbina
 * †Tautosia lenumbona
 * †Tautosia magnisepta
 * †Tautosia podistra – type locality for species
 * †Tautosia pulchra
 * †Tautosia shumardiana
 * †Tautosia transenna – type locality for species
 * †Teguliferina
 * †Teguliferina armata
 * †Teguliferina boesei – type locality for species
 * †Teguliferina compacta – type locality for species
 * †Teguliferina solidispinosa
 * †Teiichispira
 * †Teiichispira nanus – type locality for species
 * †Temnocheilus
 * †Terebratula – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Terebratula perinflata – type locality for species
 * †Terebratuloidea
 * †Terebratuloidea triplicata
 * †Tersomius – type locality for genus
 * †Tersomius texensis – type locality for species
 * †Tesnusocaris – type locality for genus
 * †Tesnusocaris goldichi – type locality for species
 * Tetraceratops insignis holotype cropped.jpg  †[[Tetraceratops]] – type locality for genus
 * †Tetraceratops insignis – type locality for species
 * †Tetralobula
 * †Tetrataxis
 * †Tetravirga
 * †Texarina
 * †Texarina elongata – type locality for species
 * †Texarina oblongata
 * †Texarina parallela
 * †Texarina paucula
 * †Texarina solida
 * †Texarina wordensis – type locality for species
 * †Texasodus – type locality for genus
 * †Texasodus varidentatus – type locality for species
 * †Texoceras
 * †Texoceras texanum – type locality for species
 * †Thaerodonta
 * †Thaerodonta recedens – or unidentified comparable form
 * †Thalattocanthus
 * †Thalattocanthus consonus
 * †Thamniscus
 * †Thamniscus digitatus – type locality for species
 * †Thamnosia
 * †Thamnosia anterospinosa
 * †Thamnosia arctica
 * †Thamnosia capitanensis
 * †Thamnosia parvispinosa
 * †Thamnosia phragmophora
 * †Thamnosia silicica
 * †Thedusia – type locality for genus
 * †Thedusia angustata
 * †Thedusia biconvexa
 * †Thedusia bucrenata
 * †Thedusia dischides
 * †Thedusia discissa
 * †Thedusia emarginata
 * †Thedusia magna
 * †Thedusia mesocostata
 * †Thedusia paucicostata
 * †Thedusia procera – type locality for species
 * †Thedusia trigonalis
 * †Thedusia ventricosa
 * †Thigriffides
 * †Thigriffides roundyi
 * †Thuroholia
 * †Thuroholia cribriformis
 * †Timaniella
 * †Timaniella pseudocamerata
 * †Timanodictya – tentative report
 * †Timorina
 * †Timorina attenuata
 * †Timorina ovata
 * †Timorina schuchertensis – type locality for species
 * †Timorites
 * †Timorites schucherti – or unidentified comparable form
 * †Timorites uddeni – type locality for species
 * †Tingia
 * †Tinsleya – type locality for genus
 * †Tinsleya texana – type locality for species
 * †Tomicosaurus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Toomeyospongia – type locality for genus
 * †Toomeyospongia apachensis – type locality for species
 * †Toomeyospongia gigantia – type locality for species
 * †Toomeyospongia modica – type locality for species
 * †Toomeyospongiella – type locality for genus
 * †Toomeyospongiella minuta – type locality for species
 * †Tornquistia – tentative report
 * †Tornquistia transversalis – type locality for species
 * †Torynechus
 * †Torynechus alectorius
 * †Torynechus caelatus – type locality for species
 * †Tostonia
 * †Trabeculites – type locality for genus
 * †Trabeculites keithae – type locality for species
 * †Trachydomia
 * †Trachydomia turbonitella – type locality for species
 * †Trailospongia – type locality for genus
 * †Trailospongia reischi – type locality for species
 * †Transennatia
 * †Transennatia gratiosa
 * †Trepospira
 * †Trepospira depressa
 * †Trepospira discoidalis
 * †Trepospira illinoisensis
 * †Trepospira sphaerulata
 * †Trepsipleura – type locality for genus
 * †Trepsipleura chordanodosa – type locality for species
 * †Trepsipleura nodosa – type locality for species
 * †Trichasaurus – type locality for genus
 * †Trichasaurus texensis – type locality for species
 * †Tricoria
 * †Tricoria hirpex
 * †Tricrepicephalus
 * †Tricrepicephalus coria
 * †Tricrepicephalus texanus
 * †Trigonoglossa
 * †Trigonoglossa nebrascensis
 * †Trigonoproductus
 * †Trigonoproductus inexpectans
 * Trimerorhachis insignis.JPG   †[[Trimerorhachis]]
 * †Trimerorhachis greggi – type locality for species
 * †Trimerorhachis insignis – type locality for species
 * †Trimerorhachis mesops – type locality for species
 * †Trimerorhachis rogersi – type locality for species
 * †Triproetus
 * †Triproetus altasulcus – type locality for species
 * †Triproetus angustus – type locality for species
 * †Triproetus tumidus – type locality for species
 * †Tristratocoelia
 * †Tristratocoelia rhythmica
 * †Triticites
 * †Triticites cellamagnus – or unidentified comparable form
 * †Trochilioceras – type locality for genus
 * †Trochilioceras tenuosum – type locality for species
 * Trochus maculatus 01.JPG [[Trochus]] – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Trophisina
 * †Trophisina fenaria
 * †Tropidelasma
 * †Tropidelasma anthicum – type locality for species
 * †Tropidelasma corniculum
 * †Tropidelasma costellatum – type locality for species
 * †Tropidelasma culmenatum
 * †Tropidelasma furcillatum
 * †Tropidelasma gregarium – type locality for species
 * †Tropidelasma perattenuatum – type locality for species
 * †Tropidelasma pygmaeum – type locality for species
 * †Tropidelasma rhamphodes – type locality for species
 * †Tropidelasma robertsi
 * †Tropidelasma strobilum – type locality for species
 * †Tropidelasma undulatum – type locality for species
 * Trypetesa
 * †Trypetesa caveata
 * †Tschernyschewia
 * †Tschernyschewia americana
 * †Tuberitina
 * †Tumulites
 * †Tumulites varians – or unidentified comparable form
 * †Tunstallia – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Tunstallia helicina – tentative report
 * Turbo – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Turbo guadalupensis – type locality for species
 * †Turbo texanus – type locality for species
 * †Turgidiffia – type locality for genus
 * †Turgidiffia columellata – type locality for species
 * †Turgidiffia completa – type locality for species
 * †Turgidiffia composita – type locality for species
 * †Tylothyris
 * †Tylothyris brevaurita – type locality for species
 * †Tylothyris missouriensis – or unidentified comparable form

U

 * †Uddenites – type locality for genus
 * †Uddenites harlani – type locality for species
 * †Uddenites oweni – type locality for species
 * †Uddenites schucherti – type locality for species
 * †Uddenites serratus – type locality for species
 * †Uddenoceras
 * †Uddenoceras oweni
 * †Ullmannia
 * †Ulocrinus
 * †Ulrichotrypa – tentative report
 * †Uncinuloides
 * †Uncinuloides guadalupensis
 * †Undellaria
 * †Undellaria magnifica
 * †Undulella
 * †Undulella guadalupensis
 * †Undulella matutina
 * †Undulella undulata – type locality for species

V

 * Varanops brevirostris Exhibit Museum of Natural History cropped.jpg †[[Varanops]]
 * †Varanops brevirostris – type locality for species
 * †Varanosaurus – type locality for genus
 * †Varanosaurus acutirostris – type locality for species
 * †Varanosaurus wichitaensis – type locality for species
 * †Varialepis – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Vesicaspora
 * †Vesicaspora schaubergeri
 * Vidria cropped.png †[[Vidria]]
 * †Vidria vespa
 * †Vidrioceras
 * †Vidrioceras irregulare – type locality for species
 * †Vidrioceras uddeni – type locality for species
 * †Virgola
 * †Virgola neptunia
 * †Virgola rigida
 * †Voiseyella
 * †Voiseyella texana – type locality for species
 * †Vorticina
 * †Vorticina keytei – type locality for species

W

 * †Waagenella
 * †Waagenella crassus
 * †Waagenella lineatus – type locality for species
 * †Waagenella plummeri – type locality for species
 * †Waagenina
 * †Waagenina rothi – type locality for species
 * †Waagenoceras
 * †Waagenoceras dieneri
 * †Waagenoconcha
 * †Waagenoconcha convexa
 * †Waagenoconcha leonardensis – type locality for species
 * †Waagenoconcha magnifica – type locality for species
 * †Waagenoconcha platys
 * †Waagenoconcha prophetica
 * †Waagenoconcha sulcata
 * †Waggoneria – type locality for genus
 * †Waggoneria knoxensis – type locality for species
 * Walchia piniformis.jpg †[[Walchia]]
 * †Walchia piniformis
 * †Walchia schlotheimii
 * †Walchia schneideri
 * †Walchiostrobus
 * †Walliserodus
 * †Warthia
 * †Warthia americana – type locality for species
 * †Warthia angustior – type locality for species
 * †Warthia crassus – type locality for species
 * †Warthia fissus – type locality for species
 * †Warthia saundersi – type locality for species
 * †Warthia waageni – type locality for species
 * †Warthia welleri
 * †Wattia – type locality for genus
 * †Wattia texana – type locality for species
 * †Wellerella
 * †Wellerella bidentata
 * †Wellerella girtyi – type locality for species
 * †Wellerella nitidula
 * †Wellerella osagensis
 * †Wellerites – type locality for genus
 * †Wellerites mohri – type locality for species
 * †Whitspakia
 * †Whitspakia schucherti
 * †Wiedeyoceras
 * †Wiedeyoceras pingue
 * †Wilbernicyathus
 * †Wilbernicyathus donegani
 * †Wilkingia
 * †Wilkingia dubium – or unidentified comparable form
 * †Wilkingia rothi
 * †Wilkingia terminale
 * †Woosteroceras
 * †Woosteroceras cherokeense
 * †Woosteroceras flexiseptatum – type locality for species
 * †Woosteroceras percurvatum – type locality for species
 * †Woosteroceras spirale – type locality for species
 * †Worthenia
 * †Worthenia alticarinata – type locality for species
 * †Worthenia arizonensis
 * †Worthenia bialveozona
 * †Worthenia bicarinata – type locality for species
 * †Worthenia corrugata
 * †Worthenia crenulata
 * †Worthenia kingi – type locality for species
 * †Worthenia latialveozona
 * †Worthenia pilula – type locality for species
 * †Worthenia planalveozona
 * †Worthenia speciosa
 * †Worthenia tabulata
 * †Worthenia whitehorsensis – type locality for species
 * †Wortheniopsis
 * †Wurmiella
 * †Wurmiella excavata

X

 * Xenacanthus NT small cropped.png †[[Xenacanthus]]
 * †Xenacanthus platypternus
 * †Xenacanthus texensis
 * †Xenechinus – type locality for genus
 * †Xenechinus parvus – type locality for species
 * †Xenelasma
 * †Xenelasma synthrophioides
 * †Xenosaria
 * †Xenosaria exotica
 * †Xenosteges – type locality for genus
 * †Xenosteges adherens – type locality for species
 * †Xenosteges anomalus
 * †Xenosteges magnus
 * †Xenosteges quadratus – type locality for species
 * †Xenosteges trivialis
 * †Xenosteges umbonatus
 * †Xestosia – type locality for genus
 * †Xestosia obsolescens
 * †Xestosia schucherti – type locality for species
 * †Xinjiangospira
 * †Xinjiangospira type locality for species – informal
 * Xylobius.jpg †[[Xyloiulus]] – tentative report

Y

 * †Yakovlevia
 * †Yakovlevia anterospinosa
 * †Yakovlevia costellata
 * †Yakovlevia hessorum
 * †Yakovlevia immatura
 * †Yakovlevia indentata
 * †Yakovlevia intermedia
 * †Yakovlevia multistriata
 * †Yakovlevia sulcata
 * †Yochelsonellisa
 * †Yochelsonellisa eximia
 * Yoldia – tentative report
 * †Yoldia subscitula
 * †Yunnania

Z

 * †Zaphrenthis
 * †Zaphrenthis gibsoni
 * Zatrachys1DB.jpg †[[Zatrachys]]
 * †Zatrachys conchigerus – type locality for species
 * †Zatrachys serratus
 * †Zeilleropteris
 * †Zeilleropteris wattii – type locality for species
 * †Zhonglupuceras
 * †Zhonglupuceras mapesi
 * †Zygopleura
 * †Zygopleura swalloviana – type locality for species
 * †Zygospira
 * †Zygospira resupinata