List of the Paleozoic life of Montana

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

A

 * †Acanthocrania
 * †Acanthocrania spinosa – type locality for species
 * †Acanthograptus
 * †Acanthopecten
 * †Acanthopecten coloradoensis
 * †Achistrum
 * †Achistrum coloculum
 * †Achistrum gamma
 * †Achistrum monochordata
 * †Acrothele
 * †Acrothele colleni – type locality for species
 * †Acrothele pentagonensis
 * †Acrotreta
 * †Acrotreta attica – or unidentified comparable form
 * †Actinopteria
 * †Actinopteria subdecussata – or unidentified comparable form
 * †Adetognathus
 * †Adetognathus gigantus
 * †Adetognathus lautus
 * †Adetognathus spathus
 * †Aenigmacaris – type locality for genus
 * †Aenigmacaris cornigerum – type locality for species
 * †Aesopichthys – type locality for genus
 * †Aesopichthys erinaceus – type locality for species
 * †Albertella – type locality for genus
 * †Albertella hellena – type locality for species
 * †Allanaria
 * Allenypterus montanus fossil - Museum of the Rockies.jpg †[[Allenypterus]] – type locality for genus
 * †Allenypterus montanus – type locality for species
 * †Allorisma
 * †Ambocoelia
 * †Ambocoelia gregaria
 * †Ambothyris
 * †Ameura – tentative report
 * Ammodiscus
 * †Amphiscapha
 * †Amplexizaphrentis
 * †Amplexizaphrentis spinulosus – or unidentified comparable form
 * †Amplexus
 * †Angulotreta
 * †Angyomphalus – tentative report
 * †Angyomphalus excavatus – type locality for species
 * †Anisotrypa
 * †Ankhelasma
 * †Annuliconcha
 * †Anoria
 * †Anthracospirifer
 * †Anthracospirifer curvilateralis – type locality for species
 * †Anthracospirifer occidus
 * †Anthracospirifer shoshonensis
 * †Anthracospirifer welleri
 * †Antiquatonia
 * †Antiquatonia coloradoensis
 * †Antiquatonia pernodosa – type locality for species
 * †Apatokephalus
 * †Apatokephalus canadensis – or unidentified comparable form
 * †Aphelaeceras
 * †Aphelaspis
 * †Apheoorthis
 * †Apheoorthis ocha
 * †Aporthophyla
 * †Apotocardium
 * †Apotocardium latifasciatum
 * †Arceodomus
 * †Arceodomus glabrata – type locality for species
 * †Archisymplectes
 * †Archisymplectes rhothon
 * †Arctospirifer
 * †Arctospirifer allegheniensis – or unidentified comparable form
 * †Asaphellus
 * †Astartella
 * †Astreptoscolex
 * †Astreptoscolex anasillosus
 * †Athyris
 * †Atrypa
 * †Aulacoparia
 * †Aulacoparia impressa – type locality for species
 * †Aulacoparia wibauxensis
 * †Aulopora
 * Aviculopecten subcardiformis01.JPG †[[Aviculopecten]]
 * †Aviculopecten kaibabensis – or unidentified comparable form
 * †Aviculopinna
 * †Avonia
 * †Avonia arcuata – tentative report
 * †Axiodeaneia

B

 * †Babylonites
 * †Bactrites
 * †Bactrites nitidus
 * Bairdia
 * †Barytichisma
 * †Barytichisma amsdenense
 * †Basilicorhynchus
 * †Basilicorhynchus ventricosum
 * †Bathyuriscus
 * †Bathyuriscus formosus – or unidentified comparable form
 * †Beagiascus – type locality for genus
 * †Beagiascus pulcherrimus – type locality for species
 * †Beecheria
 * †Beecheria paraplicata – type locality for species
 * Belantsea montana.JPG †[[Belantsea]] – type locality for genus
 * †Belantsea montana – type locality for species
 * †Bellefontia
 * †Bellerophon
 * †Bellerophon deflectus
 * †Bifungites
 * †Bifungites bisagitta
 * †Billingsella
 * †Blountia
 * †Bolaspis
 * †Brachythyris
 * †Bradyphyllum
 * †Bradyphyllum clavigerum – type locality for species
 * †Bryantodus
 * †Bryantodus crassidens
 * †Bryantodus scitulus
 * †Bryograptus
 * †Bucanella
 * †Bulimorpha
 * †Bulimorpha elegans
 * †Burnetiella
 * †Buxtonia
 * †Buxtonia arizonensis
 * †Bynumiella – tentative report
 * †Bynumina

C

 * †Cactocrinus – tentative report
 * †Caenanoplia – tentative report
 * †Caenanoplia logani – or unidentified related form
 * †Callograptus
 * †Camaraspis
 * †Camarophorella
 * †Camarophorella buckleyi – or unidentified comparable form
 * †Camarotoechia
 * †Camarotoechia C. chouteauensis – or unidentified comparable form
 * †Camarotoechia C. inaequa Shaw – or unidentified comparable form
 * †Camarotoechia contracta
 * †Camarotoechia crenistria
 * †Camarotoechia elegantula
 * †Camarotoechia herrickana – or unidentified related form
 * †Camarotoechia metallica
 * †Camarotoechia mettalica – or unidentified comparable form
 * †Camarotoechia mutata
 * †Camarotoechia tuta
 * †Canadiphyllum
 * †Caninia
 * †Caninia montanensis – type locality for species
 * †Carbosesostris – type locality for genus
 * †Carbosesostris megaliphagon – type locality for species
 * Caridosuctor populosum.jpg †[[Caridosuctor]] – type locality for genus
 * †Caridosuctor populosum – type locality for species
 * †Carinoclymenia
 * †Cavusgnathus
 * †Cavusgnathus alta
 * †Cavusgnathus naviculus
 * †Ceratopea
 * †Ceratopea sinclairensis
 * †Ceratreta
 * †Cheilocephalus
 * †Cheilocephalus brevilobus
 * †Cheiloceras
 * †Cheiloceras simplex
 * †Chilotrypa – tentative report
 * †Chonetes
 * †Chonetes geniculatus
 * †Chonetes loganensis
 * †Chonetes logani
 * †Chonetes ornatus
 * Cladodont-tooth-cladodus-belifer.jpg †[[Cladodus]]
 * †Clavallus
 * †Clavallus spicaudina
 * †Cleiothyridina
 * †Cleiothyridina atrypoides
 * †Cleiothyridina ciriacksi – type locality for species
 * †Cleiothyridina coloradoensis – or unidentified comparable form
 * †Cleiothyridina devonica
 * †Cleiothyridina hirsuta
 * †Cleiothyridina incrassata – or unidentified related form
 * †Cleiothyridina sublamellosa
 * †Cleiothyridnia
 * †Cleiothyridnia sublamellosa
 * †Cleistopora
 * †Cleistopora placenta
 * †Clelandia
 * †Cliffia
 * †Clionolithes
 * †Clonograptus
 * Compositafossil.jpg †[[Composita]]
 * †Composita humilis
 * †Composita laevis
 * †Composita lateralis – or unidentified comparable form
 * †Composita madisonensis
 * †Composita ovata
 * †Composita ozarkana
 * †Composita sulcata
 * †Conularia
 * Cornulites cellulosus.jpg †[[Cornulites]]
 * †Cornulites carbonarius
 * †Costatoblastus – type locality for genus
 * †Costatoblastus sappingtonensis – type locality for species
 * †Cranaena – tentative report
 * †Cranaena circularis – type locality for species
 * †Crania
 * †Crania blairi – or unidentified comparable form
 * †Crania rowleyi
 * †Croixana
 * †Crurithyris
 * †Crurithyris minuta
 * †Crurithyris parva – or unidentified comparable form
 * †Cryptonella – tentative report
 * †Cryptonella pinyonensis – or unidentified comparable form
 * †Crytina
 * †Crytina acutirostris
 * †Culmicrinus
 * †Culmicrinus jeffersonensis – or unidentified comparable form
 * †Cupularostrum
 * †Cupularostrum contracta
 * †Cyathaxonia
 * †Cypricardella
 * †Cyranorhis – type locality for genus
 * †Cyranorhis bergeraci – type locality for species
 * †Cyrtina
 * †Cyrtina acutirostris – or unidentified comparable form
 * †Cyrtiopsis – tentative report
 * †Cyrtodiscus
 * †Cyrtorostra
 * †Cyrtorostra varicostata
 * Cyrtospirifer verneuili duo.jpg †[[Cyrtospirifer]]
 * †Cyrtospirifer animaensis
 * †Cyrtospirifer animasensis – or unidentified comparable form
 * †Cyrtospirifer bertrandi – type locality for species
 * †Cyrtospirifer gallatinensis
 * †Cyrtospirifer hornellensis
 * †Cyrtospirifer monticola
 * †Cyrtospirifer perryi – type locality for species
 * †Cyrtospirifer thalattodoxa – tentative report
 * †Cyrtospirifer whitneyi
 * †Cystodictya

D

 * †Damocles – type locality for genus
 * †Damocles serratus – type locality for species
 * †Deadwoodia
 * †Debeerius – type locality for genus
 * †Debeerius ellefseni – type locality for species
 * †Dellea
 * Delphyodontos dacriformes cropped.jpg †[[Delphyodontos]] – type locality for genus
 * †Delphyodontos dacriformes – type locality for species
 * †Delthyris – tentative report
 * †Dendrograptus
 * †Dentinella
 * †Derbyia
 * †Deuteronectanebos – type locality for genus
 * †Deuteronectanebos papillorum – type locality for species
 * †Diaphelasma
 * †Diaphragmus
 * †Diaphragmus fasciculatus
 * †Dicellomus
 * †Dicellomus occidentalis
 * †Dictyclostus
 * †Dictyclostus richardsi
 * †Dictyoclostus
 * †Dictyoclostus ferglenensis – or unidentified comparable form
 * †Dictyoclostus gallatinensis
 * †Dictyoclostus inflatus
 * †Dictyoclostus richardsi
 * †Dictyoclosyus
 * †Dictyoclosyus inflatus
 * †Dictyonema
 * †Dielasma
 * Dikelocephalus minnesotensis pygidium draw.png †[[Dikelocephalus]]
 * †Dimegelasma
 * †Dinotocrinus
 * †Discoserra – type locality for genus
 * †Discoserra pectinodon – type locality for species
 * †Distomodus
 * †Dithyrocaris
 * †Dithyrocaris rolfei – type locality for species
 * †Ditodus
 * †Drepanodus
 * †Drepanodus subarcuatus
 * †Drumaspis
 * †Dysoristus

E

 * †Echinaria
 * †Echinauris – or unidentified related form
 * †Echinochimaera – type locality for genus
 * †Echinochimaera meltoni – type locality for species
 * †Echinochimaera snyderi – type locality for species
 * †Echinocoelia
 * †Echinocoelia youngstownensis
 * †Echinoconchus
 * †Echinoconchus alternatus – or unidentified related form
 * †Echinoconchus angustus – type locality for species
 * †Echinocrinus
 * †Edmondia
 * †Edmondia E. marionensis – or unidentified comparable form
 * †Edmondia stuchburia
 * †Ehmania – tentative report
 * †Eleutherokomma
 * †Eleutherokomma raymondi
 * †Elrathiella – or unidentified comparable form
 * †Elrathina
 * †Elvinia
 * †Elvinia roemeria
 * †Emanuella
 * †Enygmophyllum
 * Eocaudina
 * †Eocaudina columcanthus
 * †Eocaudina marginata
 * †Eocaudina subhexagona
 * †Eolissochonetes
 * †Eolissochonetes pseudoliratus – type locality for species
 * †Eoorthis
 * †Eoorthis remnicha
 * †Euconia
 * †Euconia umbilicata
 * †Euloma
 * †Eumetria
 * †Eumetria acuticosta
 * †Eumetria vera – or unidentified comparable form
 * †Eumetria verneuilana – or unidentified comparable form
 * †Eumetria verneuiliana – or unidentified comparable form
 * †Euphemites
 * †Euphemites crenulatus
 * †Euphemites sacajawensis
 * †Euphemitopsis
 * †Euphemitopsis paucinodosus – or unidentified comparable form
 * †Euphemitopsis subpapillosa
 * †Exochops

F

 * †Faberophyllum
 * Falcatus.jpg †[[Falcatus]]
 * †Falcatus falcatus
 * †Fasciculiamplexus
 * †Fasciculophyllum
 * †Favosites
 * †Fenestella
 * †Fenestralia – tentative report
 * †Fenestrella
 * †Finestrella – tentative report
 * †Floweria
 * †Floweria chemungensis – or unidentified comparable form
 * †Furcaster

G

 * †Gattendorfia
 * †Gattendorfia costata
 * †Gennaeocrinus – or unidentified comparable form
 * Geragnostus mediterraneus CRF cropped.jpg †[[Geragnostus]]
 * †Girtyella
 * †Girtyella indianensis
 * †Girtyella woodsworthi – or unidentified comparable form
 * †Girtyella woodworthi
 * †Glabretina – type locality for genus
 * †Glabretina andrewsi – type locality for species
 * †Glabrocingulum – tentative report
 * †Glaphyraspis
 * †Glaphyraspis parva
 * †Glossopleura
 * †Glyphaspis
 * †Glyphaspis robusta
 * †Grammysia
 * †Grammysia G. welleri – or unidentified comparable form
 * †Graphiadactyllis
 * †Guizhoupecten

H

 * †Hadronector – type locality for genus
 * †Hadronector donbairdi – type locality for species
 * †Hallograptus
 * †Hamburgia – tentative report
 * †Hamburgia walteri – or unidentified comparable form
 * †Hammatocyclus
 * †Haplistion
 * †Hapsiphyllum
 * †Hardistiella – type locality for genus
 * †Hardistiella montanensis – type locality for species
 * Harpagofututor volsellorhinus.jpg †[[Harpagofututor]] – type locality for genus
 * †Harpagofututor volsellorhinus – type locality for species
 * †Helicoprion
 * †Heteralosia
 * †Heteralosia beecheri
 * †Heteropecten
 * †Heteropecten vanvleeti – or unidentified comparable form
 * †Heteropetalus – type locality for genus
 * †Heteropetalus elegantulus – type locality for species
 * †Homalophyllites
 * †Homotreta
 * †Homotreta interrupta
 * †Hormotoma
 * †Horridonia – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Housia
 * †Housia canadensis
 * †Huenella
 * †Hunanospirifer
 * †Hunanospirifer animasensis
 * †Hunanospirifer gallatinensis – tentative report
 * †Hunanospirifer monticola
 * †Hustedia
 * †Hustedia texana
 * Hyoliths01.JPG]] †Hyolithes''
 * Hyperammina
 * †Hypothyris
 * †Hypseloconus
 * †Hypseloconus elongatus
 * †Hypseloconus simplex
 * †Hystriculina
 * †Hystriculina wabashensis – or unidentified comparable form
 * †Hystricurus

I

 * †Icodonta
 * †Icodonta nixonensis – or unidentified comparable form
 * †Icodonta typica
 * †Idahoia
 * †Imbrexia
 * †Imbricatia
 * †Imitoceras
 * †Inflatia
 * †Inflatia inflata – or unidentified comparable form
 * †Iphidella
 * †Iphidella hexagona
 * †Iphidella nyssa
 * †Irvingella

J

 * Janassa bituminosa.jpg †[[Janassa]]
 * †Janassa clarki – type locality for species
 * †Joanellia
 * †Joanellia lundi
 * †Juresania

K

 * †Kainella
 * †Kainella flagricauda
 * †Kallimorphocrinus
 * †Kalops
 * †Kalops diophrys
 * †Kalops monophrys
 * †Katabuporhynchus
 * †Katabuporhynchus mesacostalis
 * †Kayseraspis
 * Kendallina sp CRF.jpg †[[Kendallina]]
 * †Kindbladia
 * †Komiella
 * †Komiella ostiolata
 * †Koninkophyllum – tentative report
 * †Kootenia
 * †Kyphocephalus

L

 * †Labiostria
 * †Laminatia
 * †Laminatia laminata – tentative report
 * †Langepis
 * †Langepis campbelli
 * †Lecanospira
 * †Leioestheria
 * †Leioproductus
 * †Leioproductus coloradensis
 * †Leioproductus montanensis – type locality for species
 * †Leioproductus plicatus
 * †Leiorhynchus
 * †Leiorhynchus carboniferus
 * †Leiorhynchus dunbarense – or unidentified comparable form
 * †Leiorhynchus gibbosa – or unidentified comparable form
 * †Leiorhynchus jeffersonense
 * †Leiorhynchus lesleyi
 * †Leiorhynchus seversoni
 * †Leiorhynchus ventricosa
 * †Leiorhynchus ventricosta – or unidentified related form
 * †Lepidasterella
 * †Lepidasterella montanensis – type locality for species
 * †Leptaena
 * †Leptagonia
 * †Leptagonia analoga
 * †Leptalosia
 * †Leptalosia scintilla – tentative report
 * †Leptella
 * †Leptodesma
 * †Leptodus
 * †Leptotrypella
 * †Liardiphyllum
 * †Licnocephala
 * †Limipecten
 * †Limipecten grandicostatus – or unidentified comparable form
 * †Limipecten otterensis – type locality for species
 * †Lineagruan – type locality for genus
 * †Lineagruan judithi – type locality for species
 * †Lineagruan snowyi – type locality for species
 * †Lingula
 * †Lingula carbonaria – or unidentified comparable form
 * Lingulella caelata 1.png †[[Lingulella]]
 * †Lingulella ibicus
 * †Lingulepis
 * †Linnarssonella
 * †Linnarssonella girtyi
 * †Linnarssonia
 * †Linnarssonia perplexa
 * †Linnarssonia rotunda
 * †Linoproductus
 * †Linoproductus croneisi
 * †Linoproductus duodenaris – type locality for species
 * †Linoproductus nodosus
 * †Linoproductus ovatus
 * †Lioestheria
 * †Lithostrotion
 * †Lithostrotionella
 * †Lithostrotionella microstylum Grity
 * Lituotuba – tentative report
 * †Lloydia
 * †Lloydia incomperta
 * †Lloydia manitouensis – or unidentified comparable form
 * †Lochmocercus – type locality for genus
 * †Lochmocercus aciculodontus – type locality for species
 * †Lonchodina
 * †Lonchodina projecta
 * †Longiclava – type locality for genus
 * †Longiclava tumida – type locality for species
 * †Loxonema
 * †Loxonema approximatum
 * †Lyroschizodus
 * †Lyroschizodus oklahomensis – or unidentified comparable form

M

 * †Macluritella
 * †Macluritella stantoni – or unidentified related form
 * †Macronoda
 * †Maladia
 * †Marginifera
 * †Marginovatia
 * †Marginovatia duodenaria
 * †Martinia
 * †Maryvillia
 * †Maryvillia omega – type locality for species
 * †Mastigograptus
 * †Megalaspidella
 * Trilobites - Megistaspis aliena..JPG †[[Megistaspis]]
 * †Megistocrinus – or unidentified comparable form
 * †Metriophyllum
 * †Michelinia
 * †Microantyx
 * †Microantyx botoni
 * †Microantyx mudgei
 * †Microantyx permiana
 * †Micromitra
 * †Micromitra sculptilis
 * †Micromitra subdita
 * †Millerella
 * †Monocheilus
 * †Mooreoceras – tentative report
 * †Multivasculatus
 * †Myalina
 * †Myalina meeki
 * †Myalina parallela – type locality for species

N

 * †Nanorthis
 * †Nanorthis putilla
 * Neritopsidae - Naticopsis.JPG †[[Naticopsis]]
 * †Naticopsis remex – or unidentified comparable form
 * †Nemavermes
 * †Nemavermes mackeei
 * †Neoprioniodus
 * †Neospirifer
 * †Neospirifer praenuntius – type locality for species
 * †Neospirifer striatus
 * †Neozaphrentis
 * †Neozaphrentis parasitica
 * †Netsepoye – type locality for genus
 * †Netsepoye hawesi – type locality for species
 * †Nickelsopora
 * †Nisusia
 * †Nisusia deissi
 * †Nisusia lickensis
 * †Nisusia montanaensis
 * †Nix – type locality for genus
 * †Nix angulata – type locality for species
 * †Nucleospira
 * †Nucleospira obesa
 * Nuculana
 * †Nuculana biangulata – type locality for species
 * †Nuculopsis
 * †Nuculopsis poposiensis

O

 * †Obolus
 * [[File:Ogyginus corndensis - National Museum of Nature and Science, Tokyo - DSC07744 cropped.jpg|thumb|upright=0.5|Fossil of the Ordovician trilobite Ogyginus]] †[[Ogyginus]]
 * †Olenopsis
 * †Orbiculoidea
 * †Orbiculoidea interlineata – type locality for species
 * †Orbiculoidea missouriensis – or unidentified comparable form
 * †Orbiculoidea utahensis
 * †Orbinaria
 * †Orthonychia
 * †Orthotetes
 * †Orygmaspis
 * †Ovatia
 * †Ovatia croneisi
 * †Oxinoxis
 * †Ozarkodina
 * †Ozarkodina deflecta
 * †Ozarkodina elongata
 * †Ozarkodina macilenta
 * †Ozarkodina modesta
 * †Ozarkodina regularis

P

 * †Paladin – tentative report
 * †Palaeoneilo
 * †Palaeoneilo elongata
 * †Palaeonucula
 * †Palaeonucula montanensis
 * †Paleolimulus
 * †Paleolimulus longispinus
 * †Papilionichthys – type locality for genus
 * †Papilionichthys stahlae – type locality for species
 * †Parabolinoides
 * †Paracyclus
 * †Paraparchites
 * †Paraphorhynchus
 * †Paraphorhynchus ashboughense – type locality for species
 * †Paraphorhynchus jeffersonense
 * †Paraphorhynchus madisonense
 * †Paraphorhynchus threeforkensis – type locality for species
 * †Paraphorhynchus threeforksense
 * †Paratarrasius – type locality for genus
 * †Paratarrasius hibbardi – type locality for species
 * †Pegmatrea – or unidentified related form
 * †Pelagiella
 * †Peltabellia
 * †Peltabellia willistoni – type locality for species
 * †Pennireptepora
 * Pentremites Glen Dean Fm KY.jpg †[[Pentremites]]
 * †Perditocardinia
 * †Pericyclus
 * †Pericyclus rockymontanus – type locality for species
 * †Permophorus
 * †Permophorus albequus
 * †Pernoceras
 * †Pernoceras crebriseptum
 * †Peronopsis
 * †Peronopsis scutalis – or unidentified comparable form
 * †Petalorhynchus
 * †Petalorhynchus beargulchensis – type locality for species
 * †Petrocrania
 * †Petrocrania modesta – or unidentified comparable form
 * †Phestia
 * †Phestia rugodorsata – type locality for species
 * †Phiops – type locality for genus
 * †Phiops aciculorum – type locality for species
 * †Pinctus
 * †Pinna
 * †Pinna ludlovi
 * †Plagioglypta
 * †Platyceras
 * †Platyceras niagarensis – or unidentified comparable form
 * Platyclymeniidae - Platyclymenia species.JPG †[[Platyclymenia]]
 * †Platyclymenia montana
 * †Platycrinus
 * †Platycrinus bozemanensis
 * †Platycrinus incomptus
 * †Plectodiscus
 * †Plectodiscus latinautilus
 * †Plectospira – tentative report
 * †Plectospira problematica – or unidentified comparable form
 * †Plethopeltis
 * †Plethospira
 * †Pleuroclymenia
 * †Pleuroclymenia americana
 * †Polidevcia
 * †Polidevcia obesa
 * †Polyosteorhynchus – type locality for genus
 * †Polyosteorhynchus simplex – type locality for species
 * †Polypora
 * †Polyrhizodus
 * †Polyrhizodus digitatus
 * †Praepatokephalus
 * †Presbynileus
 * †Proceramala – type locality for genus
 * †Proceramala montanensis – type locality for species
 * †Procostatoria
 * †Procostatoria sexradiata
 * †Prodentalium
 * †Prodentalium canna
 * †Productella
 * †Productella coloradensis
 * †Productella coloradoense – or unidentified comparable form
 * †Productella coloradoensis
 * †Productella plicata – or unidentified comparable form
 * †Productella spinerga – or unidentified comparable form
 * †Productus
 * Proetus concinnus reconstruction cropped.png †[[Proetus (trilobite)|Proetus]]
 * †Prographularia
 * †Prographularia groenlandica – or unidentified comparable form
 * †Promesus
 * †Proplina
 * †Proplina loganensis – type locality for species
 * †Protopliomerops
 * †Prototreta
 * †Prototreta flabellata
 * †Prototreta subcircularis
 * †Prototreta trapeza
 * †Psalikilus
 * †Psalikilus paraspinosum
 * †Psammodus
 * †Pseudagnostus
 * †Pseudoclelandia
 * †Pseudodicellomus
 * †Pseudogastrioceras
 * †Pseudomonotis
 * †Pseudopermophorus
 * †Pseudopermophorus annettae – type locality for species
 * †Pseudozygopleura
 * †Pseudozygopleura scitula – or unidentified related form
 * †Pterocephalia
 * †Ptilograptus
 * †Ptychagnostus
 * †Ptychagnostus atavus
 * †Ptychaspis
 * †Ptychomalotoechia
 * †Ptychomalotoechia sobrina
 * Trilobites - Ptychoparia striata.JPG †[[Ptychoparia]]
 * †Ptyocephalus
 * †Ptyocephalus montanensis – type locality for species
 * †Pugnoides
 * †Pugnoides parvulus
 * †Punctolira
 * †Punctolira punctolira
 * †Punctospirifer
 * †Punctospirifer transversus
 * †Pustula

R

 * †Rachistognathus
 * †Rainerichthys – type locality for genus
 * †Rainerichthys zangerli – type locality for species
 * †Ramesses – type locality for genus
 * †Ramesses magnus – type locality for species
 * †Ramiporalia
 * †Raphistomina
 * †Renalcis
 * †Reticularia
 * †Reticulariina
 * †Reticulariina browni
 * †Reticulariina spinosa
 * †Reticularina
 * †Reticularina spinosa
 * †Retispira
 * †Reubenella – type locality for genus
 * †Reubenella rex – type locality for species
 * †Rhabdomeson
 * †Rhineoderma
 * †Rhipidomella
 * †Rhipidomella missouriensis
 * †Rhipidomella newalbanensis – or unidentified comparable form
 * †Rhombopora
 * †Rhynchopora
 * †Rhynchotreta – tentative report
 * †Rhytiophora
 * †Rhytiophora arcuatus
 * †Rhytiopora
 * †Rhytiopora arcuatus – tentative report
 * †Rota
 * †Rota martini
 * †Rotiphyllum
 * †Rugoclostus
 * †Rylstonia
 * †Rystonia
 * †Rystonia R. teres (Grity) – or unidentified comparable form

S

 * Saccammina
 * †Sanguinolites
 * †Sanguinolites altidorsata – type locality for species
 * †Saratogia
 * †Saukia
 * †Scalarituba
 * †Scalarituba missouriensis
 * †Scapallina
 * †Scapallina phosphoriensis
 * †Scaphellina
 * †Scaphellina concinna
 * †Scaphiomanon – type locality for genus
 * †Scaphiomanon hadros – type locality for species
 * †Scaphiomanon nodulosum – type locality for species
 * †Schallwienella
 * †Schellwienella
 * †Schellwienella inflata
 * †Schizambon
 * †Schizodus
 * †Schizodus bifidus – type locality for species
 * †Schizopea
 * †Schizophoria
 * †Schizophoria australis
 * †Schizophoria compacta
 * †Schizophoria depressa – type locality for species
 * †Schizophoria striatula
 * †Schizophoria strophodonta
 * †Schuchertalla
 * †Schuchertella
 * †Schuchertella arctostriata
 * †Schuchertella extensus – or unidentified comparable form
 * †Schuchertella inflata
 * †Schuchertella lens
 * †Schuchertella nodocostata
 * †Scolopodus
 * †Scolopodus quadraplicatus
 * †Sentosia
 * †Sentosia spinigera – or unidentified comparable form
 * †Septimyalina
 * †Shizophoria
 * †Shizophoria chouteauensis
 * †Shizophoria swalleri
 * †Shumardella
 * †Shumardella dunbarensis
 * †Siksika – type locality for genus
 * †Siksika ottae – type locality for species
 * †Sinuella
 * †Soleniscus
 * †Solenopleurella
 * †Soris – type locality for genus
 * †Soris labiosus – type locality for species
 * †Spathognathodus
 * †Spathognathodus peculiaris
 * †Sphenosteges
 * †Sphenotus
 * †Sphenotus altidorsatus – or unidentified comparable form
 * Spirifer perlamosus pedunculate valve.jpg †[[Spirifer]]
 * †Spirifer brazerianus – or unidentified related form
 * †Spirifer centronatus
 * †Spirifer greenockensis – or unidentified comparable form
 * †Spirifer grimesi
 * †Spirifer louisianensis – or unidentified related form
 * †Spirifer marionensis – or unidentified comparable form
 * †Spirifer mudulus
 * †Spirifer raymondi
 * †Spirifer S. centronatus Winchell – or unidentified comparable form
 * †Spirifer S. grimesi Hall – or unidentified comparable form
 * †Spirifer shoshonensis
 * †Spirifer welleri – tentative report
 * †Spiriferina
 * †Spiriferina solidirostris – or unidentified comparable form
 * Spirorbis
 * †Spirorbis kinderhookensis
 * †Spirorbis moreyi – or unidentified related form
 * †Spraparallus
 * †Squamaria
 * †Squatinactis – type locality for genus
 * †Squatinactis caudispinatus – type locality for species
 * †Squillites – type locality for genus
 * †Squillites spinosus – type locality for species
 * †Stenoglaphyrites
 * †Stenoglaphyrites hesperius
 * †Stenoscisma
 * †Stenoscisma obesa
 * Steth pair1 cropped.jpg †[[Stethacanthus]]
 * †Stethacanthus altonensis
 * †Stigmacephalus
 * †Straparollus
 * †Streblochondria
 * †Stutchburia
 * †Sulcocephalus
 * †Sulcoretepora
 * †Symphysurina
 * †Syntrophina
 * †Syntrophina nana
 * †Syntrophopsis
 * Syringoporid.jpg †[[Syringopora]]
 * †Syringopora aculeata Grity
 * †Syringopora suraularia – or unidentified related form
 * †Syringospira
 * †Syringospira prima
 * †Syringothyris
 * †Syringothyris hannibalensis
 * †Syringothyris typus – or unidentified comparable form

T

 * †Taenicephalus
 * †Teiichispira
 * †Teiichispira affinis
 * †Tetralobula
 * †Thalattocanthus
 * †Thalattocanthus consonus
 * †Thamnopora
 * Thurammina
 * †Thuroholia
 * †Thuroholia cribriformis
 * †Thuroholia spicatus
 * †Thysanophyllum
 * †Timaniella
 * †Timaniella pseudocamerata
 * †Tolypammina
 * †Tomagnostus
 * †Tomasina – tentative report
 * †Tonkinella
 * †Tonkinella stephenensis – or unidentified comparable form
 * †Tornoceras
 * †Tornoceras crebiseptum
 * †Torynifer
 * †Torynifer cooperensis
 * †Torynifer setiger – or unidentified comparable form
 * †Torynifera
 * †Torynifera montanus
 * †Trachelocrinus – tentative report
 * †Triplophylliltes
 * †Triplophylliltes spinulosus – or unidentified comparable form
 * †Trochophyllum
 * †Tropidodiscus
 * Tubulipora
 * †Tubulipora amsdenense – tentative report
 * †Tylonautilus
 * †Tylothyris
 * †Tylothyris clarkesvillensis
 * †Tylothyris clarksvillensis
 * †Tylothyris compacta
 * †Tylothyris novamexicana – or unidentified comparable form

V

 * †Vesiculophyllum
 * †Vogelgnathus
 * †Vogelgnathus campbelli

W

 * †Warthia
 * †Waylandella
 * †Wellerella
 * †Wellerella osagensis – or unidentified comparable form
 * †Wendyichthys – type locality for genus
 * †Wendyichthys dicksoni – type locality for species
 * †Wendyichthys lautreci – type locality for species
 * †Westergaardodina
 * †Whidbornella
 * †Whidbornella hirsuta
 * †Whidbornella lachrymosa
 * †Wilbernia
 * †Wilkingia
 * †Wilkingia inflata – type locality for species
 * †Wilkingia walkeri
 * †Wimanella – type locality for genus
 * †Wimanella simplex – type locality for species
 * †Worthenia – tentative report

X

 * †Xenostegium

Y

 * †Yochelsonellisa
 * †Yochelsonellisa eximia

Z

 * †Zaphrentites
 * †Zaphriphyllum