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.

• †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 – 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
  • †Aviculopecten kaibabensis – or unidentified comparable form
• †Aviculopinna
• †Avonia
  • †Avonia arcuata – tentative report
• †Axiodeaneia

• †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 – 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

• †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 – 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

• 

  †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

• 

  †Composita
  • †Composita humilis
  • †Composita laevis
  • †Composita lateralis – or unidentified comparable form
  • †Composita madisonensis
  • †Composita ovata
  • †Composita ozarkana
  • †Composita sulcata
• †Conularia

• 

  †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
  • †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

• †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 – 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
• †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

• †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

• †Faberophyllum

• 

  †Falcatus
  • †Falcatus falcatus
• †Fasciculiamplexus
• †Fasciculophyllum
• †Favosites
• †Fenestella
• †Fenestralia – tentative report
• †Fenestrella
• †Finestrella – tentative report
• †Floweria
  • †Floweria chemungensis – or unidentified comparable form
• †Furcaster

• †Gattendorfia
  • †Gattendorfia costata
• †Gennaeocrinus – or unidentified comparable form

• 

  †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

• †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 – 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

• 

  †Hyolithes
• Hyperammina
• †Hypothyris
• †Hypseloconus
  • †Hypseloconus elongatus
  • †Hypseloconus simplex
• †Hystriculina
  • †Hystriculina wabashensis – or unidentified comparable form
• †Hystricurus

• †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

• 

  †Janassa
  • †Janassa clarki – type locality for species
• †Joanellia
  • †Joanellia lundi
• †Juresania

• †Kainella
  • †Kainella flagricauda
• †Kallimorphocrinus
• †Kalops
  • †Kalops diophrys
  • †Kalops monophrys
• †Katabuporhynchus
  • †Katabuporhynchus mesacostalis
• †Kayseraspis

• 

  †Kendallina
• †Kindbladia
• †Komiella
  • †Komiella ostiolata
• †Koninkophyllum – tentative report
• †Kootenia
• †Kyphocephalus

• †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
  • †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

• †Macluritella
  • †Macluritella stantoni – or unidentified related form
• †Macronoda
• †Maladia
• †Marginifera
• †Marginovatia
  • †Marginovatia duodenaria
• †Martinia
• †Maryvillia
  • †Maryvillia omega – type locality for species
• †Mastigograptus
• †Megalaspidella

• 

  †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

• †Nanorthis
  • †Nanorthis putilla

• 

  †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

• †Obolus

• 

  †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

• †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
• †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

• 

  †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
• †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

• 

  †Ptychoparia
• †Ptyocephalus
  • †Ptyocephalus montanensis – type locality for species
• †Pugnoides
  • †Pugnoides parvulus
• †Punctolira
  • †Punctolira punctolira
• †Punctospirifer
  • †Punctospirifer transversus
• †Pustula

• †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

• 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
  • †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

• 

  †Stethacanthus
  • †Stethacanthus altonensis
• †Stigmacephalus
• †Straparollus
• †Streblochondria
• †Stutchburia
• †Sulcocephalus
• †Sulcoretepora
• †Symphysurina
• †Syntrophina
  • †Syntrophina nana
• †Syntrophopsis

• 

  †Syringopora
  • †Syringopora aculeata Grity
  • †Syringopora suraularia – or unidentified related form
• †Syringospira
  • †Syringospira prima
• †Syringothyris
  • †Syringothyris hannibalensis
  • †Syringothyris typus – or unidentified comparable form

• †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

• †Vesiculophyllum
• †Vogelgnathus
  • †Vogelgnathus campbelli

• †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

• †Xenostegium

• †Yochelsonellisa
  • †Yochelsonellisa eximia

• †Zaphrentites
• †Zaphriphyllum

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.