List of the prehistoric life of Montana

This list of the prehistoric life of Montana contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Montana.

Precambrian

The Paleobiology Database records no known occurrences of Precambrian fossils in Montana.

Paleozoic

Main article: List of the Paleozoic life of Montana

Selected Paleozoic taxa of Montana

• † Achistrum

• 

  Life restoration of the Carboniferous lobe-finned fish Allenypterus

  † Allenypterus – type locality for genus
  • † Allenypterus montanus – type locality for species
• Ammodiscus
• † Amphiscapha
• † Amplexus
• † Aphelaeceras
• † Athyris
• † Atrypa
• † Aulopora
• † Aviculopecten
  • † Aviculopecten kaibabensis – or unidentified comparable form
• † Avonia
• † Bathyuriscus

• 

  Restoration of the Carboniferous Chimaera relative Belantsea

  † Belantsea – type locality for genus
  • † Belantsea montana – type locality for species
• † Bellerophon
• † Callograptus
• † Camarotoechia
  • † Camarotoechia contracta
  • † Camarotoechia crenistria
  • † Camarotoechia elegantula
  • † Camarotoechia herrickana – or unidentified related form
  • † Camarotoechia metallica
  • † Camarotoechia mutata
  • † Camarotoechia tuta
• † Caninia

• 

  Fossilized skeleton of the Carboniferous coelacanth Caridosuctor

  † Caridosuctor – type locality for genus
• † Carinoclymenia
• † Cavusgnathus
• † Cheiloceras
• † Chonetes
  • † Chonetes geniculatus
  • † Chonetes loganensis
  • † Chonetes logani
  • † Chonetes ornatus
• † Cladodus
• † 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
• † Clonograptus

• 

  Fossilized shell of the Late Devonian-Permian brachiopod Composita

  † Composita
  • † Composita humilis
  • † Composita laevis
  • † Composita lateralis – or unidentified comparable form
  • † Composita madisonensis
  • † Composita ovata
  • † Composita ozarkana
  • † Composita sulcata
• † Cornulites
• † Crania
• † Cyranorhis – type locality for genus
• † 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
• † Debeerius – type locality for genus

• 

  Life restoration of the Carboniferous Chimaera relative Delphyodontos

  † Delphyodontos – type locality for genus
  • † Delphyodontos dacriformes – type locality for species
• † Dendrograptus
• † Dictyonema
• † Dikelocephalus
• † Distomodus
• † Echinaria
• † Echinochimaera – type locality for genus
  • † Echinochimaera meltoni – type locality for species

†Echinochimaera meltoni Lund 1977 from the Mississippian of Bear Gulch

• • † Echinochimaera snyderi – type locality for species
• † Edmondia
• † Elrathina
• Eocaudina
• † Falcatus
  • † Falcatus falcatus
• † Favosites
• † Fenestella
• † Fenestrella
• † Geragnostus
• † Hadronector – type locality for genus

• 

  Restoration (bottom) of the Carboniferous "antlered" Chimaera relative Harpagofututor

  † Harpagofututor – type locality for genus
  • † Harpagofututor volsellorhinus – type locality for species
• † Helicoprion
• † Hyolithes
• † Hypothyris
• † Hypseloconus
• † Irvingella
• † Janassa
• † Joanellia
  • † Joanellia lundi
• † Kendallina
• † Kootenia
• † Lingula
• † Lingulella
• † Lioestheria
• † Lithostrotion
• † Lloydia
• † Lochmocercus – type locality for genus
• † Maladia
• † Martinia
• † Maryvillia
• † Megalaspidella

• 

  Fossil of the Cambrian-Silurian trilobite Megistaspis

  † Megistaspis
• † Micromitra
• † Naticopsis
  • † Naticopsis remex – or unidentified comparable form
• † Neospirifer
  • † Neospirifer praenuntius – type locality for species
  • † Neospirifer striatus
• † Netsepoye – type locality for genus
• † Nisusia
• † Nix – type locality for genus
• † Obolus
• † Ogyginus
• † Orygmaspis
• † Ozarkodina
  • † Ozarkodina deflecta
  • † Ozarkodina elongata
  • † Ozarkodina macilenta
  • † Ozarkodina modesta
  • † Ozarkodina regularis
• † Paladin – tentative report
• † Paleolimulus
• † Paratarrasius – type locality for genus
• † Pelagiella

• 

  Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites

  † Pentremites
• † Peronopsis
• † Pinna
• † Platyceras
• † Platyclymenia
• † Polyosteorhynchus – type locality for genus
• † Prodentalium
• † Proetus
• † Prographularia
• † Ptychagnostus
  • † Ptychagnostus atavus
• † Ptychoparia
• † Ramesses – type locality for genus
• † Rota
• † Siksika – type locality for genus
  • † Siksika ottae – type locality for species
• † Soris – type locality for genus
• † Spathognathodus

• 

  Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer

  † 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 shoshonensis
  • † Spirifer welleri – tentative report
• † Spiriferina
• Spirorbis

• 

  Life restorations of a male (foreground) and female (background) of the Late Devonian-Carboniferous Chimaera relative Stethacanthus

  † Stethacanthus
  • † Stethacanthus altonensis
• † Syringopora
• † Tornoceras
• † Tylonautilus
• † Westergaardodina
• † Wilkingia
• † Worthenia – tentative report

Mesozoic

Main article: List of the Mesozoic life of Montana

Selected Mesozoic taxa of Montana

• 

  Life restoration of the Late Cretaceous horned dinosaur Achelousaurus

  † Achelousaurus – type locality for genus
  • † Achelousaurus horneri – type locality for species
• † Acheroraptor – type locality for genus
  • † Acheroraptor temertyorum – type locality for species
• Acipenser
• † Acristavus – type locality for genus
  • † Acristavus gagslarsoni – type locality for species
• † Adocus
• † Albanerpeton
  • † Albanerpeton nexuosus
• † Albertaceratops
  • † Albertaceratops nesmoi
• † Albertosaurus
• † Allocrioceras

• 

  Life restoration of the Late Jurassic theropod dinosaur Allosaurus

  † Allosaurus
• † Alphadon
  • † Alphadon attaragos
  • † Alphadon halleyi – type locality for species
  • † Alphadon marshi
  • † Alphadon wilsoni
• † Alzadasaurus – tentative report
• Amia
• † Amphicoelias
• † Anatotitan
  • † Anatotitan copei

• 

  Life restoration of the Late Cretaceous armored dinosaur Ankylosaurus

  † Ankylosaurus – type locality for genus
  • † Ankylosaurus magniventris – type locality for species
• † Aquilops – type locality for genus
  • † Aquilops americanus – type locality for species
• Aralia – or unidentified comparable form
• † 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
• † Asplenium
• Astarte
• † Aublysodon
  • † Aublysodon mirandus
• † Avaceratops – type locality for genus
  • † Avaceratops lammersi – type locality for species

• 

  Life restoration of the Late Cretaceous toothed bird Avisaurus with prey

  † Avisaurus – type locality for genus
  • † Avisaurus archibaldi – type locality for species
  • † Avisaurus gloriae – type locality for species
• Azolla
• † Baculites
  • † Baculites asper
  • † Baculites codyensis
  • † Baculites compressus
  • † Baculites mariasensis
• † Baena
• † Bambiraptor – type locality for genus
  • † Bambiraptor feinbergi – type locality for species
• Barbourula – or unidentified comparable form

• 

  Mounted fossilized skeleton of the Cretaceous turtle Basilemys

  † Basilemys
• † Belonostomus
  • † Belonostomus longirostris
• † Bernissartia
• † Borealosuchus
  • † Borealosuchus sternbergii
• Brachaelurus
• † Brachyceratops – type locality for genus
  • † Brachyceratops montanensis – type locality for species
• † Brachychampsa – type locality for genus
  • † Brachychampsa montana – type locality for species

• 

  Fossilized natural mummy of the Late Cretaceous duck-billed dinosaur Brachylophosaurus

  † Brachylophosaurus
  • † Brachylophosaurus canadensis – type locality for species
• † Camarasaurus
• Campeloma
• Carcharias
• † Cedrobaena
• † Centrosaurus
• † Cerasinops – type locality for genus
  • † Cerasinops hodgskissi – type locality for species
• † Ceratodus
• † Ceratops – type locality for genus
  • † Ceratops montanus – type locality for species
• † Chamops

• 

  Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus

  † Champsosaurus
• † Chasmosaurus – or unidentified comparable form
• Chiloscyllium
• † Chirostenotes
  • † Chirostenotes elegans
• Chlamys
• † Chondroceras
• † Cimexomys
  • † Cimexomys minor
• † Cimolestes
  • † Cimolestes incisus
  • † Cimolestes stirtoni
• † Cimoliasaurus
• † Cimolodon
  • † Cimolodon nitidus

• 

  Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys

  † Cimolomys
  • † Cimolomys clarki – type locality for species
  • † Cimolomys gracilis
• † Cimolopteryx
  • † Cimolopteryx maxima
• 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
• † Componocancer
  • † Componocancer roberti
• † Compsemys
• † Coniophis
• † Continuoolithus
• † Coriops

• 

  Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Corythosaurus

  † Corythosaurus
  • † Corythosaurus casuarius
• † Cretolamna
  • † Cretolamna appendiculata
• † Cretorectolobus – type locality for genus
  • † Cretorectolobus olsoni – type locality for species
• † Crocodilus
• Cucullaea
• † Daspletosaurus
  • † Daspletosaurus horneri – type locality for species
• † Deinodon – type locality for genus
  • † Deinodon horridus – type locality for species

• 

  Life restoration of the Early Cretaceous dromaeosaur ("raptor") Deinonychus

  † Deinonychus – type locality for genus
  • † Deinonychus antirrhopus – type locality for species
• † Deinosuchus – type locality for genus
  • † Deinosuchus rugosus – type locality for species
• Dentalium
• † Derrisemys
• † Diclonius
• † Didelphodon
• † Didymoceras
  • † Didymoceras cheyennense
  • † Didymoceras nebrascense
  • † Didymoceras stevensoni

• 

  Life restoration of the Late Jurassic long-necked dinosaur Diplodocus

  † Diplodocus
• † Doratodon – or unidentified comparable form
• † Dromaeosaurus
  • † Dromaeosaurus albertensis
• † Dyoplosaurus
  • † Dyoplosaurus acutosquameus
• † Edgarosaurus
  • † Edgarosaurus muddi
• † Edmontonia
  • † Edmontonia longiceps
  • † Edmontonia rugosidens – type locality for species
• † Edmontosaurus

  • 

    Life restoration of the Late Cretaceous duck-billed dinosaur Edmontosaurus annectens

    † Edmontosaurus annectens
• † Einiosaurus – type locality for genus
  • † Einiosaurus procurvicornis – type locality for species
• † Emarginachelys – type locality for genus
  • † Emarginachelys cretacea – type locality for species
• † Eodelphis
• † Eopelobates – or unidentified comparable form
• † Equisetum
• † Essonodon – type locality for genus
  • † Essonodon browni – type locality for species
• † Eucrossorhinus
• † Euomphaloceras

• 

  Restoration of the Late Cretaceous armored dinosaur Euoplocephalus

  † Euoplocephalus
  • † Euoplocephalus tutus
• † Eutrephoceras
• † Exiteloceras
• † Exogyra
• Ficus – or unidentified comparable form
• † Gervillia
• † Gilmoremys
  • † Gilmoremys lancensis
• Ginkgo
• † Ginkgoites
• † Glishades – type locality for genus
  • † Glishades ericksoni – type locality for species
• † Glyptops
• Glyptostrobus – or unidentified comparable form

• 

  Mounted fossilized skeleton of the Middle Jurassic-Late Cretaceous mammal Gobiconodon

  † Gobiconodon – type locality for genus
• † Goniobasis
• † Gorgosaurus
  • † Gorgosaurus libratus – type locality for species
• † Gryphaea
  • † Gryphaea impressimarginata
• † Gryposaurus
  • † Gryposaurus latidens – type locality for species
  • † Gryposaurus notabilis
• † Habrosaurus
  • † Habrosaurus dilatus
• † Hadrosaurus
  • † Hadrosaurus breviceps – type locality for species
  • † Hadrosaurus paucidens – type locality for species
• † Hamites

• 

  Life restoration of the Late Cretaceous toothed bird Hesperornis

  † Hesperornis
• † Hybodus
  • † Hybodus montanensis – type locality for species
• † Hypacrosaurus
  • † Hypacrosaurus stebingeri – type locality for species

• 

  Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size

  † 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
• † Ischyodus
  • † Ischyodus bifurcatus
• † Ischyrhiza
  • † Ischyrhiza avonicola
  • † Ischyrhiza mira

• 

  Life restoration of the Late Cretaceous horned dinosaur Judiceratops

  † Judiceratops – type locality for genus
  • † Judiceratops tigris – type locality for species
• † Kritosaurus
• † Krokolithes
• † Lepidotes
  • † Lepidotes haydeni – type locality for species
  • † Lepidotes occidentalis – type locality for species
• Lepisosteus
• † Leptalestes
  • † Leptalestes cooki
  • † Leptalestes krejcii
  • † Leptalestes prokrejcii
  • † Leptalestes toevsi – type locality for species

• 

  Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops

  † Leptoceratops
  • † Leptoceratops gracilis
• † Leptorhynchos – tentative report
• † Lingula
• † Lisserpeton – type locality for genus
  • † Lisserpeton atlantes
  • † Lisserpeton bairdi – type locality for species
• † Lonchidion
• Lopha
• † Lucina
• Lunatia
• † Magnuviator – type locality for genus
• † Maiasaura – type locality for genus
  • † Maiasaura peeblesorum – type locality for species
• † Medusaceratops – type locality for genus
  • † Medusaceratops lokii – type locality for species
• † Melvius – type locality for genus
• † Meniscoessus
  • † Meniscoessus major
  • † Meniscoessus robustus – type locality for species
• † 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
• † Microvenator – type locality for genus
  • † Microvenator celer – type locality for species
• † Modiolus
• † Monoclonius – type locality for genus
  • † Monoclonius crassus – type locality for species
  • † Monoclonius recurvicornis – type locality for species
  • † Monoclonius sphenocerus – type locality for species
• † Montanalestes

• 

  Mounted fossilized skeletons of the Late Cretaceous pterosaur Montanazhdarcho

  † Montanazhdarcho – type locality for genus
  • † Montanazhdarcho minor – type locality for species
• † Montanoceratops
  • † Montanoceratops cerorhynchus – type locality for species
• † Montanoolithus – type locality for genus
• † Mosasaurus
  • † Mosasaurus missouriensis
• † Myledaphus
  • † Myledaphus bipartitus
• † Mytilus
• † Nanotyrannus
  • † Nanotyrannus lancensis – type locality for species
• † Naomichelys – type locality for genus

• 

  A living Nelumbo lotus

  † Nelumbo
• † Neocardioceras
  • † Neocardioceras juddii
  • † Neocardioceras minutum
• † Neoplagiaulax
  • † Neoplagiaulax burgessi – type locality for species
• † Nezpercius – type locality for genus
• † Nidimys – type locality for genus
• † Normannites – tentative report
• † Notogoneus
• Nucula
• † Obamadon – type locality for genus
  • † Obamadon gracilis – type locality for species
• † Odaxosaurus
  • † Odaxosaurus piger

• 

  A living Odontaspis sand shark

  Odontaspis
  • † Odontaspis sanguinei – type locality for species
• † Oklatheridium
• † Onchosaurus
• † Oohkotokia – type locality for genus
  • † Oohkotokia horneri – type locality for species
• † Ophiomorpha
• † Opisthotriton
• † Ornithomimus
  • † Ornithomimus grandis – type locality for species
  • † Ornithomimus tenuis – type locality for species
• † Orodromeus – type locality for genus
  • † Orodromeus makelai – type locality for species

• 

  Life restoration of the Late Cretaceous herbivorous dinosaur Oryctodromeus in a burrow

  † Oryctodromeus – type locality for genus
  • † Oryctodromeus cubicularis – type locality for species
• Ostrea
• † Oxytoma
• † Pachycephalosaurus – type locality for genus
  • † Pachycephalosaurus wyomingensis – type locality for species
• † Pagiophyllum
• † Palaeobatrachus
• † Palaeosaniwa
  • † Palaeosaniwa canadensis
• † Palaeoscincus – type locality for genus
  • † Palaeoscincus costatus – type locality for species
• † Palatobaena
• † Paleopsephurus – type locality for genus
  • † Paleopsephurus wilsoni – type locality for species

• 

  Illustration of a fossilized skull of the Late Cretaceous armored dinosaur Panoplosaurus

  † Panoplosaurus
• † Pappotherium
• † 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
• † Paralbula
• † Paramacellodus – or unidentified comparable form
• † Paranecturus – type locality for genus
  • † Paranecturus garbanii – type locality for species

• 

  Fossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size

  † Parapuzosia
  • † Parapuzosia bradyi – type locality for species
• † Paronychodon
  • † Paronychodon lacustris
• † Pectinodon – or unidentified comparable form
• Pholadomya
  • † Pholadomya kingi
• Physa
• † Piceoerpeton
• † Piksi – type locality for genus
  • † Piksi barbarulna – type locality for species
• † Pinna
• † Pistia
• † Plesiobaena
• † Pleuronautilus
• † Prenoceratops – type locality for genus
  • † Prenoceratops pieganensis – type locality for species
• † Prismatoolithus
• † Proamphiuma
• † Prodesmodon

• 

  Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Prosaurolophus

  † Prosaurolophus
  • † Prosaurolophus blackfeetensis – type locality for species
• † Protocardia
• † Protoscaphirhynchus – type locality for genus
• † Protungulatum
• † Pseudomelania
• † Pteria – tentative report
• † Pteropelyx – type locality for genus
  • † Pteropelyx grallipes – type locality for species
• † Ptychotrygon
  • † Ptychotrygon blainensis – type locality for species
  • † Ptychotrygon triangularis
• Pycnodonte
• Quercus – report made of unidentified related form or using admittedly obsolete nomenclature

• 

  Life restoration of a flock of the Late Cretaceous pterosaur Quetzalcoatlus feeding on the ground

  † Quetzalcoatlus – or unidentified comparable form
• † Rhamnus – report made of unidentified related form or using admittedly obsolete nomenclature
• † Richardoestesia
  • † Richardoestesia gilmorei
  • † Richardoestesia isosceles
• † 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

• 

  Life restoration of the Early Cretaceous armored dinosaurs Sauropelta

  † Sauropelta – type locality for genus
  • † Sauropelta edwardsorum – type locality for species
• † Saurornitholestes
  • † Saurornitholestes langstoni
• † Scapherpeton
• † Scaphites
  • † Scaphites impendicostatus
  • † Scaphites preventricosus
  • † Scaphites ventricosus
• † Scolosaurus
  • † Scolosaurus cutleri
• † Scotiophryne – type locality for genus

• 

  Base of the trunk of a living Sequoia tree with a human to scale

  † Sequoia
• Sphaerium
• † Sphaerotholus
  • † Sphaerotholus buchholtzae – type locality for species
• † Sphenopteris
  • † Sphenopteris brulensis
  • † Sphenopteris geopperti
  • † Sphenopteris latiloba
  • † Sphenopteris mclearni
• † Spheroolithus
  • † Spheroolithus albertensis
  • † Spheroolithus choteauensis – type locality for species
  • † Spheroolithus maiasauroides

• 

  Restoration of the Late Cretaceous horned dinosaur Spiclypeus

  † Spiclypeus – type locality for genus
  • † Spiclypeus shipporum – type locality for species
• † Spiriferina – report made of unidentified related form or using admittedly obsolete nomenclature
• Squalicorax
  • † Squalicorax kaupi
  • † Squalicorax pristodontus
• † Squatirhina
  • † Squatirhina americana
• † Stegoceras
  • † Stegoceras validum
• † Stegosaurus
• † Suuwassea – type locality for genus
  • † Suuwassea emilieae – type locality for species
• † Tatankacephalus – type locality for genus
  • † Tatankacephalus cooneyorum – type locality for species

• 

  Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus

  † Tenontosaurus – type locality for genus
  • † Tenontosaurus tilletti – type locality for species
• † Terminonaris – type locality for genus
  • † 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
• † Toxolophosaurus – type locality for genus
• † Trachodon – type locality for genus
  • † Trachodon altidens
  • † Trachodon marginatus
  • † Trachodon mirabilis – type locality for species

• 

  Mounted fossilized skeleton of the Late Cretaceous horned dinosaur Triceratops

  † Triceratops
  • † Triceratops horridus
  • † Triceratops maximus – type locality for species
  • † Triceratops prorsus
• † Trigonia
  • † Trigonia montanaensis
• Trionyx
• † Triprismatoolithus – type locality for genus
• † Troodon – type locality for genus
  • † Troodon formosus – type locality for species
• † Tubercuoolithus – type locality for genus
• Turritella
• † Tylosaurus
  • † Tylosaurus proriger

• 

  Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus

  † Tyrannosaurus – type locality for genus
  • † Tyrannosaurus rex – type locality for species
• † Ugrosaurus – type locality for genus
  • † Ugrosaurus olsoni – type locality for species
• Unio
• † Valenopsalis
• Valvata – tentative report
• Vitis – report made of unidentified related form or using admittedly obsolete nomenclature
• Viviparus
• † Volviceramus
• † Woodwardia – report made of unidentified related form or using admittedly obsolete nomenclature
• † Xenocephalites – tentative report
• Xenophora
• † Yezoites

• 

  Fossil of the Early Triassic-Eocene cycad-like frond Zamites

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

Cenozoic

Main article: List of the Cenozoic life of Montana

Selected Cenozoic taxa of Montana

• Abies
• Abies
• Acer
• † Acheronodon
  • † Acheronodon garbani – type locality for species
• Acipenser

• 

  Mounted fossilized skeleton of the Miocene horse Acritohippus

  † Acritohippus
  • † Acritohippus isonesus
• † Aelurodon
• † Aepycamelus
  • † Aepycamelus stocki
• † Agnotocastor
• † Agriochoerus
• † Agrostis
• † Ailanthus
• Alangium
• Alnus

• 

  Life restoration of the Miocene elephant relative Amebelodon . Margret Flinsch (1932).

  † Amebelodon
• Amelanchier
• † Amentotaxus
• Amia
• † Ampelopsis
• † Amphechinus
• † Amphicyon
• † Amyzon
• Anas
  • † Anas platyrhynchos – or unidentified comparable form
• † Anconodon
• † Anemia
• † Angustidens
• Antilocapra – or unidentified comparable form
  • † Antilocapra americana
• † Aphelops
• † Araucaria
• † Archaeocyon
• † Archaeohippus
• † Arctocyon
• † Arctodus
  • † Arctodus simus
• † Arctostaphylos
• Arundo
• Arvicola
• †aspera
• † Astronium
• † Athyana
• † Avunculus

• 

  Living Azolla water ferns

  Azolla
• † Baiotomeus
  • † Baiotomeus douglassi
  • † Baiotomeus lamberti – type locality for species
• † Bathygenys
• † Berberis
• Berchemia
• Betula
• Bibio – or unidentified related form
• Bison
  • † Bison bison

  • 

    Mounted fossilized skeleton of the Pleistocene Bison latifrons , also known as the giant bison or long-horned bison

    † Bison latifrons – or unidentified comparable form
• † Bisonalveus
  • † Bisonalveus browni
• † Blastomeryx
  • † Blastomeryx gemmifer
• † Bootherium
• † Borealosuchus
  • † Borealosuchus sternbergii
• † Brachychampsa
• † Brachycrus
• † Brachyrhynchocyon
• † Camelops
  • † Camelops minidokae
• † Canavalia
• Canis
  • † Canis latrans
  • † Canis lupus
• † Canna
• † Cardiospermum
• Carpinus

• 

  Life restoration of the Paleocene primate relative Carpolestes

  † Carpolestes
• Carya
• † Cassia
• Castanea
• Castor
  • † Castor californicus
  • † Castor canadensis
• † Catalpa
• † Catopsalis
  • † Catopsalis alexanderi
  • † Catopsalis waddleae
• Ceanothus
• Cedrela
• † Celastrus
• Celtis
• Cercidiphyllum
• Cercis
• † Cercocarpus
• † Chamaecyparis
• † Chamops

• 

  Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus

  † Champsosaurus
• † Chisternon
• † Chriacus
  • † Chriacus calenancus
• † Chthonophis – type locality for genus
  • † Chthonophis subterraneus – type locality for species
• † Cimexomys
  • † Cimexomys minor – type locality for species
• † Cimolestes
  • † Cimolestes incisus

• 

  A living Cinnamomum , or cinnamon tree

  Cinnamomum
• Cissus
• Clematis
• Cocculus
• † Colodon
• † Colubrina
  • † Colubrina asiatica – or unidentified comparable form
• † Compsemys
• † Coniophis – or unidentified comparable form
• † Conzattia
• Cornus
• † Corylus
• † Coryphodon
• † Cosoryx – tentative report
• Crataegus

• 

  Fossilized leaf from a Credneria tree

  † Credneria
• Crematogaster
• Culiseta
• † Cynodesmus
• Cynomys
  • † Cynomys ludovicianus
• † Dalbergia
  • † Dalbergia retusa
• † Daphoenictis – or unidentified comparable form
• † Davidia
• † Derrisemys – type locality for genus
• † Desmatochoerus
• † Diceratherium
• † Didymictis

• 

  Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis . Robert Bruce Horsfall (1913).

  † Dinictis
• † Dinohippus
• † Dioctria – tentative report
• † Diospyros
• † Diphysa
• Dipteronia
• † Dissacus
• Dolichoderus
• † Domnina

• 

  Fossilized horns, jaws, and limb bones of the Miocene deer relative Dromomeryx

  † Dromomeryx
  • † Dromomeryx borealis
• Dryopteris
• † Ectocion
• † Elomeryx – tentative report
• † Eoconodon
  • † Eoconodon nidhoggi
• † Eotitanops
• † Epicyon
  • † Epicyon haydeni
• † Epihippus
• † Equisetum
• Equus
  • † Equus conversidens – or unidentified comparable form
• † Eucastor
• † Eucommia

  • 

    Fossilized fruit of the Eocene Eucommia montana plant

    † Eucommia montana
• † Euonymus
• † Euoplocyon
• Exbucklandia
• Ficus
• Fokienia
• Formica
• † Fraxinus
• Geochelone
• Gerrhonotus – or unidentified comparable form
• Ginkgo
  • † Ginkgo adiantoides
• Gleichenia
• Glyptostrobus
• † Goniacodon
• † Habrosaurus
  • † Habrosaurus dilatus
• † Helaletes
• Helius

• 

  Fossilized skull of the Oligocene lizard Helodermoides

  † Helodermoides – type locality for genus
  • † Helodermoides tuberculatus – type locality for species
• † Herpetotherium
  • † Herpetotherium fugax
  • † Herpetotherium knighti – or unidentified comparable form
• † Hesperocyon
• † Heteraletes
• † Hiodon
• Holmskioldia
• † Holopogon
• Homo
  • † Homo sapiens

• 

  Restoration of Pliocene-Pleistocene Homotherium , or scimitar cat

  † Homotherium
  • † Homotherium serum
• † Hutchemys – type locality for genus
• † Hyaenodon
  • † Hyaenodon crucians
• Hydrangea
• † Hydromystria
• † Hyopsodus
• † Hypertragulus
• † Hypisodus

• 

  Life restoration of the Miocene horse Hypohippus . Heinrich Harder (1920).

  † Hypohippus
• † Hypolagus
• † Hypsiops
• † Hyrachyus
• † Hyracodon
• † Ictidopappus
• † Intyrictis
• † Ischyrhiza – or unidentified comparable form
  • † Ischyrhiza avonicola
• † Ischyromys
• Isoetes
• Juglans
  • † Juglans regia – or unidentified comparable form
• Juniperus
• † Kerria
• † Kimbetohia
• Koelreuteria
• Lasius
• Laurus
• Lemmiscus
  • † Lemmiscus curtatus
• Lepisosteus

• 

  Restoration of the Oligocene-Miocene oreodont mammal Leptauchenia

  † Leptauchenia
• † Leptictis
• † Leptocyon
• † Leptomeryx
• † Leptoreodon
• † Leucaena
• † Limnenetes
• Lindera
• † Lisserpeton
  • † Lisserpeton bairdi
• † Lithornis
  • † Lithornis celetius – type locality for species
• Lynx

  • 

    A living Lynx rufus , or bobcat

    † Lynx rufus
• Magnolia
• Mahonia
• † Mammut
  • † Mammut americanum
• † Mammuthus
  • † Mammuthus columbi
  • † Mammuthus primigenius
• Marchantia
• Marmota
• Martes

• 

  Life restoration of battling males of the Eocene brontothere mammal Megacerops

  † Megacerops
• † Megahippus
• † Megalonyx
  • † Megalonyx jeffersonii
• † Megantereon
• † Megatylopus
• † Menodus
• † Merriamoceros
• † Merychippus
  • † Merychippus sejunctus
• † Merychyus

• 

  Restorative portrait of the Oligocene-Miocene oreodont mammal Merycochoerus

  † Merycochoerus
• † Merycodus
• † Merycoides
• † Merycoidodon
• † Mesodma
  • † Mesodma formosa
  • † Mesodma garfieldensis – type locality for species
  • † Mesodma pygmaea – type locality for species
  • † Mesodma thompsoni
• † Mesohippus
• † Mesoreodon
• Metasequoia
  • † Metasequoia occidentalis
• † Metopium

• 

  Life restoration of the Paleocene-Eocene mammal Miacis

  † Miacis – report made of unidentified related form or using admittedly obsolete nomenclature
• † Microcosmodon
  • † Microcosmodon harleyi – type locality for species
• Microtus
  • † Microtus pennsylvanicus – or unidentified comparable form
• † Mimetodon
• † Miniochoerus – tentative report
• † Miohippus – type locality for genus
  • † Miohippus grandis
• † Monosaulax
• Morus
• Mustela
  • † Mustela frenata
• Myrica
• † Nanotragulus
• † Nelumbo

• 

  Life restoration of a herd of Neohipparion . Robert Bruce Horsfall (1913).

  † Neohipparion
• † Neoplagiaulax
  • † Neoplagiaulax donaldorum – type locality for species
  • † Neoplagiaulax grangeri – type locality for species
  • † Neoplagiaulax hunteri – type locality for species
  • † Neoplagiaulax kremnus
  • † Neoplagiaulax mckennai
  • † Neoplagiaulax nelsoni – type locality for species
• † Niglarodon
• † Nuphar
• † Nyssa
• † Odaxosaurus
  • † Odaxosaurus piger

• 

  A living Odocoileus deer

  Odocoileus – or unidentified comparable form
• Olar
• Ondatra
  • † Ondatra zibethicus
• † Onoclea
• † Opisthotriton
• Oreohelix
• † Oreonetes
• † Osmanthus
• † Osmunda
  • † Osmunda greenlandica
• Ostrya
• † Otarocyon
• † Oxyacodon

• 

  Life restoration of a pair of the Oligocene-Miocene camel Oxydactylus . Robert Bruce Horsfall (1913).

  † Oxydactylus
• † Palaeogale
• † Palaeolagus
• † Palaeoryctes
• † Palaeosinopa
• † Palaeosyops
• † Palatobaena
• † Paleopsephurus – or unidentified comparable form
• Paliurus
• † Pandemonium
• † Pantolambda
• † Pantomimus – type locality for genus

• 

  Fossilized skeleton of the Pliocene-Pleistocene ground sloth Paramylodon

  † Paramylodon
  • † Paramylodon harlani
• † Paramys
• † Paratomarctus
• † Parectypodus
  • † Parectypodus sinclairi – type locality for species
  • † Parectypodus sylviae
• † Parictis
• † Parthenocissus
• † Paulownia
• † Peltosaurus
• Penthetria
• † Peraceras
• Perognathus
• Peromyscus
  • † Peromyscus maniculatus – or unidentified comparable form
• Persea

• 

  Life restoration of the Paleocene-Eocene ungulate Phenacodus . Charles R. Knight (1898).

  † Phenacodus
• Phragmites
• Picea
• † Piceoerpeton
• Pinus
• † Pithecolobium
• † Planetetherium
  • † Planetetherium mirabile – type locality for species
• † Plastomenoides – type locality for genus
• Platanus
• Plecia
• † Plesiadapis
• † Pliohippus
• † Plithocyon
• † Poebrotherium

• 

  Illustration of a fossilized skull of the Oligocene false faber-toothed cat Pogonodon

  † Pogonodon
• Populus
• † Potentilla
• † Prochetodon
  • † Prochetodon foxi – type locality for species
• † Prodesmodon
• † Proiridomyrmex
• † Promerycochoerus
• † Proscalops
• † Prosphyracephala

• 

  Fossil of the Oligocene ant Protazteca

  † Protazteca
• † Protohippus
• † Protolabis
• † Protungulatum
  • † Protungulatum donnae
• Prunus
• † Pseudhipparion
• † Pseudolarix
• † Pseudomesoreodon – type locality for genus
• Pseudomyrmex
• † Pseudotsuga

• 

  Restoration of the Paleocene taeniodont mammal Psittacotherium multifragum

  † Psittacotherium
• Ptelea
• Pteris
• Pterocarya
• † Ptilodus
  • † Ptilodus kummae
  • † Ptilodus montanus – type locality for species
  • † Ptilodus tsosiensis

• 

  Life restoration of the Late Cretaceous-Paleocene primate relative Purgatorius

  † Purgatorius
  • † Purgatorius janisae – type locality for species
  • † Purgatorius titusi – type locality for species
  • † Purgatorius unio – type locality for species
• † Pyracantha
• Quercus
• † Rana – or unidentified comparable form
• Rangifer
  • † Rangifer tarandus
• † Rhamnus
  • † Rhamnus crocea
• Rhus
• † Robinia
• Rosa
• Sabal
• † Saccoloma
• Salix
• † Sambucus
• † Sapindus
• Sassafras

  • 

    Fossilized leaf of the Eocene sassafras Sassafras hesperia

    † Sassafras hesperia
• † Scapherpeton
• † Scaphohippus
• † Scotiophryne – or unidentified comparable form
• † Selaginella
• Sequoia
  • † Sequoia affinis
• † Simoedosaurus
• †Simpson
• † Smilax
• † Sophora
• † Sorbus
• † Sparganium
• Spea
• Spermophilus
  • † Spermophilus richardsonii
• † Spiraea
• † Stelocyon
• † Steneofiber

• 

  Life restoration of the Oligocene-Miocene camel Stenomylus

  † Stenomylus
  • † Stenomylus hitchcocki – or unidentified comparable form
• Sterculia
• † Stygimys
  • † Stygimys camptorhiza – or unidentified comparable form
  • † Stygimys jepseni – type locality for species
  • † Stygimys kuszmauli – type locality for species
• † Subdromomeryx
  • † Subdromomeryx antilopinus
• † Subhyracodon
• † Submerycochoerus
  • † Sylvicola fenestralis
• Sylvilagus
  • † Sylvilagus nuttallii
• † Symplocarpus
• † Taeniolabis
  • † Taeniolabis lamberti – type locality for species

• 

  Life restoration of the Eocene carnivoran relative Tapocyon

  † Tapocyon
• Taricha
• Taxodium
• † Teleoceras
• † Tetraclaenodon
• Thomomys
  • † Thomomys talpoides
• † Thrinax
• † Thuja
• † Ticholeptus
• Tilia
• † Tinuviel
• Tipula

• 

  Life restoration of the Paleocene pantodonts mammal Titanoides

  † Titanoides
  • † Titanoides gidleyi
• † Trapa
• † Trigenicus
• † Trigonias
• † Tropidia
• † Tylocephalonyx
• Typha
• Ulmus
• Ursus
• † Vaccinium
• † Valenopsalis
• † Vauquelinia
• † Viburnum
• † Viguiera
• Vitis
• † Viverravus – tentative report
• † Woodwardia
• † Xyronomys
• Zelkova

References

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