List of the Mesozoic life of Montana

This list of the Mesozoic 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 252.17 and 66 million years of age.

• †Achelousaurus – type locality for genus
  • †Achelousaurus horneri – type locality for species

• 

  †Acheroraptor – type locality for genus
  • †Acheroraptor temertyorum – type locality for species
• Acipenser
  • †Acipenser eruciferus
• †Acristavus – type locality for genus
  • †Acristavus gagslarsoni – type locality for species
• †Acrostichopteris
  • †Acrostichopteris longipennis
• †Adiantites
  • †Adiantites montanensis
• †Adocus
• †Albanerpeton
  • †Albanerpeton nexuosus

• 

  †Albertaceratops
  • †Albertaceratops nesmoi
• †Albertatherium
  • †Albertatherium primus
• †Albertosaurus
• †Allocrioceras
  • †Allocrioceras annulatum

• 

  †Allosaurus
• †Alostera
  • †Alostera saskatchewanensis
• †Alphadon
  • †Alphadon attaragos
  • †Alphadon halleyi – type locality for species
  • †Alphadon marshi
  • †Alphadon wilsoni
• †Altacreodus
  • †Altacreodus magnus
• †Alzadasaurus – tentative report
• †Alzadites – type locality for genus
  • †Alzadites alzadensis – type locality for species
• †Ambilestes
  • †Ambilestes cerberoides – or unidentified comparable form
• Amia
  • †Amia fragosa
  • †Amia uintaensis
• †Amphicoelias
• †Anatotitan
  • †Anatotitan copei
• †Anchura – tentative report

• 

  †Ankylosaurus – type locality for genus
  • †Ankylosaurus magniventris – type locality for species
• †Anomozamites
• †Aquiladelphis
  • †Aquiladelphis incus
  • †Aquiladelphis minor
• †Aquilapollenites
  • †Aquilapollenites collaris
  • †Aquilapollenites conatus
  • †Aquilapollenites marmarthensis
  • †Aquilapollenites mtchedlishvilii
  • †Aquilapollenites quadrilobus
  • †Aquilapollenites turbidus

• 

  †Aquilops – type locality for genus
  • †Aquilops americanus – type locality for species
• Aralia – or unidentified comparable form
  • †Aralia wellingtonia
• †Araliaephyllum
  • †Araliaephyllum westonii
• †Araliopsoides
  • †Araliopsoides cretacea – or unidentified comparable form
• †Araucarites
  • †Araucarites longifolia
• †Arcellites
• †Archaeolamna
  • †Archaeolamna kopingensis
• †Archaeotriakis – type locality for genus
  • †Archaeotriakis rochelleae – type locality for species

• 

  †Arcticoceras – tentative report
• †Arctocephalites
  • †Arctocephalites gracilis – or unidentified comparable form
  • †Arctocephalites maculatus – or unidentified comparable form
  • †Arctocephalites platynotus – or unidentified comparable form
  • †Arctocephalites sawtoothensis
  • †Arctocephalites saypoensis
• †Argaliatherium – type locality for genus
  • †Argaliatherium robustum – type locality for species
• †Ariadnaesporites
  • †Ariadnaesporites fluviatilis – type locality for species
• †Ascarinites – type locality for genus
  • †Ascarinites communis – type locality for species
• †Aspideretoides
• †Aspidophyllum – or unidentified comparable form
  • †Aspidophyllum trilobatum
• †Asplenium

• 

  Astarte
  • †Astarte meeki
  • †Astarte morion
  • †Astarte packardi – or unidentified comparable form
• †Athrotaxites
  • †Athrotaxites berryi – or unidentified comparable form
• †Aublysodon
  • †Aublysodon mirandus
• †Austrotindaria
  • †Austrotindaria canalensis
  • †Austrotindaria svalbardensis
• †Avaceratops – type locality for genus
  • †Avaceratops lammersi – type locality for species
• Avicula

• 

  †Avisaurus – type locality for genus
  • †Avisaurus archibaldi – type locality for species
  • †Avisaurus gloriae – type locality for species
• †Axestemys
  • †Axestemys splendida – type locality for species
• Azolla
  • †Azolla barbata
  • †Azolla circinata – type locality for species
  • †Azolla distincta
  • †Azolla simplex – type locality for species
  • †Azolla spinata – type locality for species
• †Azollopsis – type locality for genus
  • †Azollopsis coccoides – type locality for species
  • †Azollopsis tomentosa – type locality for species

• †Baculatisporites

• 

  †Baculites
  • †Baculites asper
  • †Baculites codyensis
  • †Baculites compressus
  • †Baculites mariasensis
• †Baena
  • †Baena callosa – type locality for species
• †Baioconodon
  • †Baioconodon nordicus – or unidentified comparable form
• †Bakevellia

• 

  †Bambiraptor – type locality for genus
  • †Bambiraptor feinbergi – type locality for species
• Barbourula – or unidentified comparable form
• †Basilemys
  • †Basilemys sinuosa – type locality for species
• †Batodon
  • †Batodon tenuis
• †Belfria – type locality for genus
  • †Belfria microphylla – type locality for species

• 

  †Belonostomus
  • †Belonostomus longirostris
• †Bernissartia
• †Biretisporites
  • †Biretisporites deltoideus
• †Borealosuchus
  • †Borealosuchus sternbergii
• †Boremys
  • †Boremys pulchra
• †Borissiakoceras
  • †Borissiakoceras orbiculatum
• Brachaelurus
  • †Brachaelurus estesi
• †Brachyceratops – type locality for genus
  • †Brachyceratops montanensis – type locality for species
• †Brachychampsa – type locality for genus
  • †Brachychampsa montana – type locality for species
  • †Brachychampsa montanus

• 

  †Brachylophosaurus
  • †Brachylophosaurus canadensis – type locality for species
• †Buccinammonites – type locality for genus
  • †Buccinammonites minimus – type locality for species

• 

  †Camarasaurus
• Campeloma
• †Camptonectes
  • †Camptonectes platessiformis
  • †Camptonectes stygius
• Carcharias
• †Cardiaster
  • †Cardiaster curtus
• †Carinalestes – type locality for genus
  • †Carinalestes murensis – type locality for species
• †Cedrobaena
  • †Cedrobaena brinkman
• †Celastrophyllum – or unidentified comparable form

• 

  †Centrosaurus
• †Cerasinops – type locality for genus
  • †Cerasinops hodgskissi – type locality for species
• †Ceratodus
  • †Ceratodus frazieri
  • †Ceratodus guentheri – or unidentified comparable form
• †Ceratops – type locality for genus
  • †Ceratops montanus – type locality for species
• †Cerberophis – type locality for genus
  • †Cerberophis robustus – type locality for species
• †Cercomya
  • †Cercomya punctata
• †Chamops
  • †Chamops segnis
• †Champsosaurus
  • †Champsosaurus natator

• 

  †Chasmosaurus – or unidentified comparable form
• Chiloscyllium
  • †Chiloscyllium missouriensis – type locality for species
• †Chirostenotes
  • †Chirostenotes elegans
• Chlamys
• †Chondroceras
  • †Chondroceras allani – or unidentified comparable form
  • †Chondroceras oblatum
• †Cimexomys
  • †Cimexomys minor
• †Cimolestes
  • †Cimolestes incisus
  • †Cimolestes stirtoni
• †Cimoliasaurus
• †Cimolodon
  • †Cimolodon nitidus

• 

  †Cimolomys
  • †Cimolomys clarki – type locality for species
  • †Cimolomys gracilis
• †Cimolopteryx
  • †Cimolopteryx maxima
• †Cinnamomoides
• Cladophlebis
  • †Cladophlebis alberta
  • †Cladophlebis constricta
  • †Cladophlebis heterophylla
  • †Cladophlebis inclinata
  • †Cladophlebis oblongifolia
  • †Cladophlebis oerstedi
  • †Cladophlebis virginiensis
• †Claosaurus
• †Claraia
  • †Claraia aurita
  • †Claraia clarai
  • †Claraia mulleri
  • †Claraia stachei

• 

  †Clidastes
• †Clioscaphites
  • †Clioscaphites vermiformis
• †Cobbanites
• †Coelostylina
• †Colpodontosaurus
  • †Colpodontosaurus cracens
• †Componocancer
  • †Componocancer roberti
• †Compsemys
  • †Compsemys victa
• †Coniophis
  • †Coniophis precedens
• †Coniopteris
  • †Coniopteris bella – or unidentified comparable form
  • †Coniopteris hymenophylloides
  • †Coniopteris simplex
• †Continuoolithus
  • †Continuoolithus canadensis
• †Contogenys – type locality for genus
  • †Contogenys sloani – type locality for species
• †Coriops
  • †Coriops amnicolus
• †Corviconodon
  • †Corviconodon montanensis – type locality for species

• 

  †Corythosaurus
  • †Corythosaurus casuarius
• Crassatella
• †Cremnoceramus
  • †Cremnoceramus deformis
• †Cretolamna
  • †Cretolamna appendiculata
• †Cretorectolobus – type locality for genus
  • †Cretorectolobus olsoni – type locality for species
• †Crocodilus
  • †Crocodilus humilis
• †Cryptometoicoceras
  • †Cryptometoicoceras mite
• Cucullaea
  • †Cucullaea haguei
  • †Cucullaea rockymontana
• †Cyathidites
  • †Cyathidites minor
• †Cycadolepis
• †Cycadopites
  • †Cycadopites fragilis
• †Cyclurus
  • †Cyclurus fragosus

• †Daspletosaurus
  • †Daspletosaurus horneri – type locality for species
• †Deinodon – type locality for genus
  • †Deinodon horridus – type locality for species

• 

  †Deinonychus – type locality for genus
  • †Deinonychus antirrhopus – type locality for species
• †Deinosuchus – type locality for genus
  • †Deinosuchus rugosus – type locality for species
• †Deltoidospora
  • †Deltoidospora cascadensis – type locality for species
  • †Deltoidospora diaphana
  • †Deltoidospora hallii – type locality for species
• Dentalium
• †Derrisemys
  • †Derrisemys sterea
• †Diclonius
• †Dictyothykalos

• 

  †Didelphodon
  • †Didelphodon vorax
• †Didymoceras
  • †Didymoceras cheyennense
  • †Didymoceras nebrascense
  • †Didymoceras stevensoni
• †Diettertia
  • †Diettertia montanensis

• 

  †Diplodocus
• †Doratodon – or unidentified comparable form
• †Dromaeosaurus
  • †Dromaeosaurus albertensis
• †Dryophyllum – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Dryophyllum subfalcatum
• †Dunveganoceras
  • †Dunveganoceras albertense
  • †Dunveganoceras parvum – type locality for species
  • †Dunveganoceras pondi
• †Dyadonapites
  • †Dyadonapites reticulatus

• 

  †Dyoplosaurus
  • †Dyoplosaurus acutosquameus

• †Echinatisporis
• †Ectocentrocristus
  • †Ectocentrocristus foxi – type locality for species
• †Ectoconodon
  • †Ectoconodon montanensis – type locality for species
• †Edgarosaurus
  • †Edgarosaurus muddi
• †Edmontonia
  • †Edmontonia longiceps
  • †Edmontonia rugosidens – type locality for species
• †Edmontosaurus

  • 

    †Edmontosaurus annectens
• †Einiosaurus – type locality for genus
  • †Einiosaurus procurvicornis – type locality for species
• †Elasmodus
  • †Elasmodus greenoughi – or unidentified comparable form
• †Emarginachelys – type locality for genus
  • †Emarginachelys cretacea – type locality for species
• †Entolioides
  • †Entolioides utahensis
• †Eodelphis
• †Eopelobates – or unidentified comparable form

• 

  †Equisetum
  • †Equisetum cascadensis – type locality for species
  • †Equisetum laterale
  • †Equisetum montanensis
• †Erdtmanipollis
  • †Erdtmanipollis procumbentiformis
• †Essonodon – type locality for genus
  • †Essonodon browni – type locality for species
• †Eubaena
  • †Eubaena cephalica
• †Eucrossorhinus
  • †Eucrossorhinus microcuspidatus – type locality for species
• †Eumorphotis
  • †Eumorphotis amplicostata – type locality for species
  • †Eumorphotis ericius – or unidentified comparable form
  • †Eumorphotis multiformis
• †Euomphaloceras
  • †Euomphaloceras septemseriatum

• 

  †Euoplocephalus
  • †Euoplocephalus tutus
• †Eutrephoceras
  • †Eutrephoceras montanensis – type locality for species
• †Exiteloceras
  • †Exiteloceras jenneyi
• †Exogyra
  • †Exogyra columbella
• †Exostinus
  • †Exostinus lancensis

• †Falepetrus
  • †Falepetrus barwini
• Ficus – or unidentified comparable form
  • †Ficus ovatifolia
• †Fletcherithyris – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Fletcherithyris margaritovi
• †Foraminisporis
  • †Foraminisporis undulates

• †Gastopoda
• †Gervillia
  • †Gervillia ussurica – or unidentified comparable form
• †Gilmoremys
  • †Gilmoremys lancensis

• 

  Ginkgo
  • †Ginkgo pluripartita
• †Ginkgoites
  • †Ginkgoites cascadensis
  • †Ginkgoites pluripartita
• †Glasbius
  • †Glasbius twitchelli – type locality for species
• †Glishades – type locality for genus
  • †Glishades ericksoni – type locality for species
• †Glyptops
  • †Glyptops pervicax – type locality for species
• Glyptostrobus – or unidentified comparable form

• 

  †Gobiconodon – type locality for genus
  • †Gobiconodon ostromi – type locality for species
• †Goniobasis
  • †Goniobasis subtortuosa
• †Gorgosaurus
  • †Gorgosaurus libratus – type locality for species
• †Grammatodon
• †Grewipollenites
  • †Grewipollenites radiatus

• 

  †Gryphaea
  • †Gryphaea – type locality for species – informal
  • †Gryphaea impressimarginata
• †Gryposaurus
  • †Gryposaurus latidens – type locality for species
  • †Gryposaurus notabilis
• †Gypsonictops
  • †Gypsonictops hypoconus
  • †Gypsonictops illuminatus
  • †Gypsonictops lewisi – type locality for species
• Gyrodes
  • †Gyrodes conradi

• †Habrosaurus
  • †Habrosaurus dilatus
• †Hadrosaurus
  • †Hadrosaurus breviceps – type locality for species
  • †Hadrosaurus paucidens – type locality for species
• †Hamites
  • †Hamites cimarronensis
• †Haptosphenus
  • †Haptosphenus placodon
• †Hausmannia
  • †Hausmannia fisheri
  • †Hausmannia montanensis
• †Helopanoplia
  • †Helopanoplia distincta

• 

  †Hesperornis
  • †Hesperornis montana – type locality for species
• †Heteropecten – tentative report
• †Holocrinus
• †Hoploscaphites^[1]
  • †Hoploscaphites macer – type locality for species^[1]
• †Hummelichelys
  • †Hummelichelys beecheri
  • †Hummelichelys foveatus – type locality for species
• †Hybodus
  • †Hybodus montanensis – type locality for species
  • †Hybodus storeri – type locality for species
• †Hypacrosaurus
  • †Hypacrosaurus stebingeri – type locality for species
• †Hypotodus
  • †Hypotodus grandis – type locality for species

• †Idiohamites
  • †Idiohamites bispinosus – type locality for species
  • †Idiohamites pulchellus – type locality for species

• 

  †Inoceramus
  • †Inoceramus arnoldi
  • †Inoceramus canaliculatus
  • †Inoceramus cancellatus
  • †Inoceramus cardissoides - or unidentified loosely related form
  • †Inoceramus cordiformis – or unidentified comparable form
  • †Inoceramus erectus
  • †Inoceramus fragilis – or unidentified related form
  • †Inoceramus frechi – or unidentified comparable form
  • †Inoceramus gibbosus
  • †Inoceramus gilli – type locality for species
  • †Inoceramus glacierensis – type locality for species
  • †Inoceramus koeneni
  • †Inoceramus latisulcatus – or unidentified comparable form
  • †Inoceramus lesginensis
  • †Inoceramus lingua – or unidentified comparable form
  • †Inoceramus lundbreckensis
  • †Inoceramus sokolovi – type locality for species
  • †Inoceramus undabundus
  • †Inoceramus walterdorfensis
• †Iqualadelphis
  • †Iqualadelphis lactea

• 

  †Ischyodus
  • †Ischyodus bifurcatus
• †Ischyrhiza
  • †Ischyrhiza avonicola
  • †Ischyrhiza mira
• †Isocyprina – or unidentified comparable form
  • †Isocyprina iddingsi

• 

  †Judiceratops – type locality for genus
  • †Judiceratops tigris – type locality for species
• †Judithemys
  • †Judithemys backmani

• †Kastanoceras – type locality for genus
  • †Kastanoceras spiniger – type locality for species
• †Klukia
  • †Klukia canadensis

• 

  †Kritosaurus
  • †Kritosaurus breviceps – or unidentified comparable form
• †Krokolithes

• †Labrodioctes – type locality for genus
  • †Labrodioctes montanensis – type locality for species
• †Laevigatosporites
  • †Laevigatosporites haardtii

• 

  †Lepidotes
  • †Lepidotes haydeni – type locality for species
  • †Lepidotes occidentalis – type locality for species
• †Lepismatina – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Lepismatina mansfieldi
• Lepisosteus
  • †Lepisosteus occidentalis
• †Leptalestes
  • †Leptalestes cooki
  • †Leptalestes krejcii
  • †Leptalestes prokrejcii
  • †Leptalestes toevsi – type locality for species

• 

  †Leptoceratops
  • †Leptoceratops gracilis
• †Leptochamops
  • †Leptochamops denticulatus
• †Leptochondria
  • †Leptochondria occidanea
• †Leptopecopites
  • †Leptopecopites pocockii
• †Leptorhynchos – tentative report
• †Lesterwardia – type locality for genus
  • †Lesterwardia palustris – type locality for species
• †Liliacidites
• †Lingula
• †Lingularia
  • †Lingularia borealis
• †Lioplacodes
  • †Lioplacodes judithensis
  • †Lioplacodes williamsi
• †Liostrea
  • †Liostrea strigilecula
• †Lisserpeton – type locality for genus
  • †Lisserpeton atlantes
  • †Lisserpeton bairdi – type locality for species
• †Lonchidion
  • †Lonchidion selachos

• 

  Lopha
• †Lucina
• Lunatia
  • †Lunatia dakotensis – or unidentified comparable form
• †Lygobius – type locality for genus
  • †Lygobius knowltoni – type locality for species

• †Magadiceramus
  • †Magadiceramus soukupi
• †Magnuviator – type locality for genus
  • †Magnuviator ovimonsensis – type locality for species
• †Maiasaura – type locality for genus
  • †Maiasaura peeblesorum – type locality for species
• †Marchantiolites
  • †Marchantiolites blairmorensis
• †Marmarthia
  • †Marmarthia trivialis
• †Medusaceratops – type locality for genus
  • †Medusaceratops lokii – type locality for species
• †Meleagrinella
  • †Meleagrinella curta
• †Melvius – type locality for genus
  • †Melvius thomasi – type locality for species
• †Meniscoessus
  • †Meniscoessus major
  • †Meniscoessus robustus – type locality for species
• †Meniscognathus
  • †Meniscognathus altmani

• 

  †Mercuriceratops – type locality for genus
  • †Mercuriceratops gemini – type locality for species
• †Mesodma
  • †Mesodma formosa
  • †Mesodma hensleighi
  • †Mesodma primaeva
  • †Mesodma thompsoni
• †Metoicoceras
  • †Metoicoceras geslinianum
  • †Metoicoceras mosbyense – type locality for species
  • †Metoicoceras muelleri
• †Metzgeriites
  • †Metzgeriites montanensis – type locality for species
• †Micrabacia
  • †Micrabacia radiata
• †Microsulcatoceras – type locality for genus
  • †Microsulcatoceras puzosiiforme – type locality for species

• 

  †Microvenator – type locality for genus
  • †Microvenator celer – type locality for species
• †Minerisporites
  • †Minerisporites pseudorichardsonii
• †Miocidaris
• †Modiolus
  • †Modiolus rosii
• †Monoclonius – type locality for genus
  • †Monoclonius crassus – type locality for species
  • †Monoclonius recurvicornis – type locality for species
  • †Monoclonius sphenocerus – type locality for species
• †Monosulcites
  • †Monosulcites riparius
• †Montanalestes
  • †Montanalestes keeblerorum

• 

  †Montanazhdarcho – type locality for genus
  • †Montanazhdarcho minor – type locality for species
• †Montania – type locality for genus
  • †Montania glandulosa – type locality for species
• †Montanoceratops
  • †Montanoceratops cerorhynchus – type locality for species
• †Montanoolithus – type locality for genus
  • †Montanoolithus strongorum – type locality for species
• †Moremanoceras
  • †Moremanoceras costatum
  • †Moremanoceras montanaense – type locality for species
  • †Moremanoceras straini
• †Mosasaurus
  • †Mosasaurus missouriensis
• †Myalina
  • †Myalina postcarbonica
• †Myledaphus
  • †Myledaphus bipartitus

• 

  †Mytilus

• †Nannometoicoceras
  • †Nannometoicoceras nanos – type locality for species

• 

  †Nanotyrannus
  • †Nanotyrannus lancensis – type locality for species
• †Naomichelys – type locality for genus
  • †Naomichelys speciosa – type locality for species
• †Necrocarcinus
• †Nelumbo
  • †Nelumbo peltata – type locality for species
• †Neocardioceras
  • †Neocardioceras juddii
  • †Neocardioceras minutum
• †Neogastroplites
  • †Neogastroplites haasi
• †Neoplagiaulax
  • †Neoplagiaulax burgessi – type locality for species
• †Neoschizodus
• †Neurankylus – type locality for genus
  • †Neurankylus eximius – type locality for species
• †Nezpercius – type locality for genus
  • †Nezpercius dodsoni – type locality for species
• †Nidimys – type locality for genus
  • †Nidimys occultus – type locality for species
• †Nilsonia
  • †Nilsonia compta – or unidentified comparable form
• †Normannites – tentative report
  • †Normannites crickmayi – or unidentified comparable form
• †Nortedelphys – type locality for genus
  • †Nortedelphys jasoni – type locality for species
  • †Nortedelphys minimus – type locality for species

• 

  †Notogoneus
  • †Notogoneus montananesis – type locality for species
  • †Notogoneus montenensis – type locality for species
• Nucula
• †Nymphaeites

• †Obamadon – type locality for genus
  • †Obamadon gracilis – type locality for species
• †Odaxosaurus
  • †Odaxosaurus piger
• Odontaspis
  • †Odontaspis sanguinei – type locality for species
• †Oklatheridium
  • †Oklatheridium wiblei – type locality for species
• †Onchosaurus
  • †Onchosaurus avonicolus

• 

  †Oohkotokia – type locality for genus
  • †Oohkotokia horneri – type locality for species
• †Ophioglypha
  • †Ophioglypha bridgerensis
• †Ophiomorpha
• †Opisthotriton
  • †Opisthotriton kayi
• †Orbicoelia
• †Ornithomimus
  • †Ornithomimus grandis – type locality for species
  • †Ornithomimus tenuis – type locality for species
• †Orodromeus – type locality for genus
  • †Orodromeus makelai – type locality for species

• 

  †Oryctodromeus – type locality for genus
  • †Oryctodromeus cubicularis – type locality for species
• Ostrea
• †Oxybeloceras
  • †Oxybeloceras crassum
• †Oxytoma
  • †Oxytoma mclearni

• 

  †Pachycephalosaurus – type locality for genus
  • †Pachycephalosaurus wyomingensis – type locality for species
• †Pagiophyllum
• †Palaeobatrachus
  • †Palaeobatrachus occidentalis
• †Palaeolabrus
  • †Palaeolabrus montanensis
• †Palaeosaniwa
  • †Palaeosaniwa canadensis
• †Palaeoscincus – type locality for genus
  • †Palaeoscincus costatus – type locality for species
• †Palatobaena
  • †Palatobaena bairdi
• †Paleopsephurus – type locality for genus
  • †Paleopsephurus wilsoni – type locality for species
• †Paleoungulatum – type locality for genus
  • †Paleoungulatum hooleyi – type locality for species

• 

  †Panoplosaurus
• †Pappotherium
  • †Pappotherium pattersoni
• †Parachondroceras
  • †Parachondroceras andrewsi
  • †Parachondroceras filicostatum
• †Paracimexomys
  • †Paracimexomys judithae – type locality for species
  • †Paracimexomys magnus – type locality for species
  • †Paracimexomys priscus
  • †Paracimexomys propriscus – type locality for species
  • †Paracimexomys robisoni – or unidentified comparable form
• †Paraderma
  • †Paraderma bogerti
• †Paralbula
  • †Paralbula casei
• †Paramacellodus – or unidentified comparable form
  • †Paramacellodus keebleri – type locality for species
• †Paranecturus – type locality for genus
  • †Paranecturus garbanii – type locality for species
• †Paranyctoides
  • †Paranyctoides maleficus

• 

  †Parapuzosia
  • †Parapuzosia bradyi – type locality for species
• †Parasaniwa
  • †Parasaniwa wyomingensis
• †Parataxodium
• †Parazolla – type locality for genus
  • †Parazolla heterotricha – type locality for species
• †Parazollopsis – type locality for genus
  • †Parazollopsis cascadensis – type locality for species
• †Paronychodon
  • †Paronychodon lacustris

• 

  †Pectinodon – or unidentified comparable form
• †Pediomys
  • †Pediomys elegans
• †Peneteius – type locality for genus
  • †Peneteius aquilonius – type locality for species
• †Penetetrapites
  • †Penetetrapites inconspicuous
• †Pentacrinus
  • †Pentacrinus asteriscus
• †Permophorus
  • †Permophorus triassicus
• †Phelopteria
• Pholadomya
  • †Pholadomya inaequiplicatus
  • †Pholadomya kingi

• 

  Physa
  • †Physa copei – or unidentified comparable form
• †Piceoerpeton
  • †Piceoerpeton naylori – type locality for species
• †Piksi – type locality for genus
  • †Piksi barbarulna – type locality for species
• †Pinna
  • †Pinna kingi
• †Pistia
  • †Pistia corrugata
• †Pityocladus
• †Pityophyllum
  • †Pityophyllum lindstromi
• †Pityosporites
  • †Pityosporites constrictus
• †Placunopsis
• †Plastomenus
  • †Plastomenus costatus
• †Platacodon
  • †Platacodon nanus
• †Platanophyllum
• †Plesiacanthoceras
  • †Plesiacanthoceras wyomingense
• †Plesiacanthoceratoides
  • †Plesiacanthoceratoides alzadense
• †Plesiobaena
  • †Plesiobaena antiqua
• †Pleuromya
  • †Pleuromya oblongata – or unidentified comparable form
  • †Pleuromya subcompressa
• †Pleuronautilus
• †Pleuronectites – tentative report
• †Plicatolamna
  • †Plicatolamna arcuata
• †Podozamites
  • †Podozamites lanceolatus
• †Polycingulatisporites
  • †Polycingulatisporites reduncus

• 

  †Prenoceratops – type locality for genus
  • †Prenoceratops pieganensis – type locality for species
• †Prismatoolithus
  • †Prismatoolithus hirschi – type locality for species
  • †Prismatoolithus levis
• †Pristinuspollenites
  • †Pristinuspollenites microsaccus
• †Proamphiuma
  • †Proamphiuma cretacea
• †Procerberus
• †Prodesmodon
  • †Prodesmodon copei
• †Promyalina
  • †Promyalina spathi – type locality for species

• 

  †Prosaurolophus
  • †Prosaurolophus blackfeetensis – type locality for species
• †Protalphadon
  • †Protalphadon foxi – type locality for species
  • †Protalphadon lulli
• †Protexanites
• †Protocaiman
• †Protocardia
  • †Protocardia schucherti
• †Protolambda^[2]
  • †Protolambda mcgilli – type locality for species^[3]
  • †?Protolambda clemensi – type locality for species
  • †Protolambda florencae
  • †Protolambda hatcheri
• †Protolamna
  • †Protolamna sokolovi
• †Protophyllocladus
  • †Protophyllocladus subintegrifolius
• †Protophyllum – or unidentified comparable form
• †Protoplatyrhina – type locality for genus
  • †Protoplatyrhina renae – type locality for species
• †Protoscaphirhynchus – type locality for genus
  • †Protoscaphirhynchus squamosus – type locality for species

• 

  †Protungulatum
  • †Protungulatum coombsi – type locality for species
  • †Protungulatum gorgun
• †Psammorhynchus
  • †Psammorhynchus longipinnis – type locality for species
• †Pseudocycas
  • †Pseudocycas douglasii – type locality for species
• †Pseudohypolophus
• †Pseudomelania
  • †Pseudomelania hendricksoni
• †Pteria – tentative report
  • †Pteria ussurica – or unidentified comparable form
• †Pteropelyx – type locality for genus
  • †Pteropelyx grallipes – type locality for species
• †Ptychotrygon
  • †Ptychotrygon blainensis – type locality for species
  • †Ptychotrygon hooveri
  • †Ptychotrygon triangularis

• 

  Pycnodonte

• †Quenstedtia – tentative report
• Quercus – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Quercus stantoni

• 

  †Quetzalcoatlus – or unidentified comparable form

• †Retinovena – type locality for genus
  • †Retinovena fluvialis – type locality for species
• †Retitricolpites
  • †Retitricolpites microreticulatus
• Rhabdocolpus
• †Rhaeboceras
  • †Rhaeboceras burkholderi – type locality for species
  • †Rhaeboceras cedarense – type locality for species
  • †Rhaeboceras coloradoense
  • †Rhaeboceras halli
  • †Rhaeboceras subglobosum
• †Rhamnus – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Rhamnus cleburni
• †Richardoestesia
  • †Richardoestesia gilmorei
  • †Richardoestesia isosceles
• †Rostellites – tentative report

• 

  †Rubeosaurus
  • †Rubeosaurus ovatus – type locality for species
• †Rugocaudia – type locality for genus
  • †Rugocaudia cooneyi – type locality for species

• †Sagenopteris
  • †Sagenopteris elliptica
  • †Sagenopteris mclearni
  • †Sagenopteris williamsii

• 

  †Sauropelta – type locality for genus
  • †Sauropelta edwardsorum – type locality for species
• †Saurornitholestes
  • †Saurornitholestes langstoni
• †Scabrastephanocolpites
  • †Scabrastephanocolpites lepidus
• †Scapherpeton
  • †Scapherpeton tectum
• †Scaphites
  • †Scaphites impendicostatus
  • †Scaphites mariasensis
  • †Scaphites preventricosus
  • †Scaphites ventricosus
• †Scaphotrigonia
  • †Scaphotrigonia naviformis
• †Schizolepis
• †Schizosporis
  • †Schizosporis laevigatus
• †Sciponoceras
  • †Sciponoceras gracile
• †Scollardius
  • †Scollardius propalaeoryctes

• 

  †Scolosaurus
  • †Scolosaurus cutleri
• †Scotiophryne – type locality for genus
  • †Scotiophryne pustulosa – type locality for species
• †Sequoia
• †Siberiapollis
  • †Siberiapollis montanensis
• †Sohlites
  • †Sohlites spinosus
• †Solenoceras
  • †Solenoceras bearpawense
• †Spalacotheridium
  • †Spalacotheridium mckennai
• Sphaerium
  • †Sphaerium planum
• †Sphaerotholus
  • †Sphaerotholus buchholtzae – type locality for species
• †Sphenopteris
  • †Sphenopteris brulensis
  • †Sphenopteris geopperti
  • †Sphenopteris goepperti
  • †Sphenopteris latiloba
  • †Sphenopteris mclearni
• †Spheroolithus
  • †Spheroolithus albertensis
  • †Spheroolithus choteauensis – type locality for species
  • †Spheroolithus maiasauroides

• 

  †Spiclypeus – type locality for genus
  • †Spiclypeus shipporum – type locality for species
• †Spiriferina – report made of unidentified related form or using admittedly obsolete nomenclature
• †Sporonites
  • †Sporonites montanensis – type locality for species
• Squalicorax
  • †Squalicorax kaupi
  • †Squalicorax pristodontus
• †Squatirhina
  • †Squatirhina americana
• †Stantoniella – type locality for genus
  • †Stantoniella cretacea – type locality for species
• †Stegoceras
  • †Stegoceras validum

• 

  †Stegosaurus
• †Stemmatoceras
  • †Stemmatoceras albertense – or unidentified related form
  • †Stemmatoceras arcicostum
  • †Stemmatoceras palliseri – or unidentified related form
• †Stygiochelys – type locality for genus
  • †Stygiochelys estesi – type locality for species
• †Sumitomoceras
• †Suuwassea – type locality for genus
  • †Suuwassea emilieae – type locality for species
• †Symmetrodontoides
  • †Symmetrodontoides canadensis
• †Synechodus
  • †Synechodus andersoni – type locality for species
  • †Synechodus striatus – type locality for species

• †Tancredia
  • †Tancredia inornata – or unidentified comparable form
• †Tarrantoceras
  • †Tarrantoceras cuspidum
• †Tatankacephalus – type locality for genus
  • †Tatankacephalus cooneyorum – type locality for species
• †Taxodiaceaepollenites
  • †Taxodiaceaepollenites hiatus

• 

  †Tenontosaurus – type locality for genus
  • †Tenontosaurus tilletti – type locality for species
• †Terminonaris – type locality for genus
  • †Terminonaris browni – type locality for species
  • †Terminonaris robusta – type locality for species
• †Thalassomedon – type locality for genus
  • †Thalassomedon hanningtoni – type locality for species
• †Thescelosaurus
  • †Thescelosaurus garbanii – type locality for species
  • †Thescelosaurus neglectus
• †Thescelus
  • †Thescelus insiliens
• †Thlaeodon – tentative report
• †Todisporites
  • †Todisporites dubius – or unidentified comparable form
• †Toxolophosaurus – type locality for genus
  • †Toxolophosaurus cloudi – type locality for species
• †Trachodon – type locality for genus
  • †Trachodon altidens
  • †Trachodon marginatus
  • †Trachodon mirabilis – type locality for species
• †Trachytriton
  • †Trachytriton – type locality for species – informal

• 

  †Triceratops
  • †Triceratops horridus
  • †Triceratops maximus – type locality for species
  • †Triceratops prorsus
• †Trigonia
  • †Trigonia conradi – or unidentified comparable form
  • †Trigonia montanaensis
  • †Trigonia trafalgarensis – or unidentified comparable form
• †Trigonocallista
  • †Trigonocallista orbiculata
• Trionyx
• †Triprismatoolithus – type locality for genus
  • †Triprismatoolithus stephensi – type locality for species
• †Trochicola
  • †Trochicola scollardiana
• †Trochodendroides

• 

  †Troodon – type locality for genus
  • †Troodon formosus – type locality for species
• †Tubercuoolithus – type locality for genus
  • †Tubercuoolithus tetonensis – type locality for species
• †Tubulifloridites
  • †Tubulifloridites aedicula
• †Tullochelys
  • †Tullochelys montana
• †Turgidodon
  • †Turgidodon praesagus
  • †Turgidodon rhaister
  • †Turgidodon russelli
• Turritella
• †Tylosaurus
  • †Tylosaurus proriger

• 

  †Tyrannosaurus – type locality for genus
  • †Tyrannosaurus rex – type locality for species

• †Ugrosaurus – type locality for genus
  • †Ugrosaurus olsoni – type locality for species
• Unio
• †Unionites
  • †Unionites fassaensis

• †Valenopsalis
  • †Valenopsalis joyneri
• Valvata – tentative report
  • †Valvata montanensis
• †Varalphadon
  • †Varalphadon wahweapensis
• †Veniella
• Vitis – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Vitis stantoni
• Viviparus
  • †Viviparus couesii

• 

  †Volviceramus
  • †Volviceramus exogyroides
  • †Volviceramus involutus

• †Weediaphyllum – type locality for genus
  • †Weediaphyllum parkensis – type locality for species
• †Weltrichia
• †Wodehousia
  • †Wodehousia spinata
• †Woodwardia – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Woodwardia crenata

• †Xenocephalites – tentative report

• 

  Xenophora

• †Yezoites
  • †Yezoites delicatulus

• 

  †Zamites
  • †Zamites arcticus
• †Zapsalis – or unidentified comparable form
• †Zephyrosaurus – type locality for genus
  • †Zephyrosaurus schaffi – type locality for species
• †Zlivisporis
  • †Zlivisporis cenomanianus
• †Zygastrocarcinus
  • †Zygastrocarcinus waagei

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