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.
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- †Achelousaurus – type locality for genus
- †Achelousaurus horneri – type locality for species
Life restoration of the Late Cretaceous dromaeosaurid ("raptor") Acheroraptor - †Acheroraptor temertyorum – type locality for species
- Acipenser
- †Acristavus – type locality for genus
- †Acristavus gagslarsoni – type locality for species
- †Acrostichopteris
- †Adiantites
- †Adocus
- †Albanerpeton
Life restoration of the Late Cretaceous horned dinosaur Albertaceratops - †Albertatherium
- †Albertosaurus
- †Allocrioceras
Life restoration of the Late Jurassic theropod dinosaur Allosaurus - †Alostera
- †Alphadon
- †Alphadon attaragos
- †Alphadon halleyi – type locality for species
- †Alphadon marshi
- †Alphadon wilsoni
- †Altacreodus
- †Alzadasaurus – tentative report
- †Alzadites – type locality for genus
- †Alzadites alzadensis – type locality for species
- †Ambilestes
- †Ambilestes cerberoides – or unidentified comparable form
- Amia
- †Amphicoelias
- †Anatotitan
- †Anchura – tentative report
Life restoration of the Late Cretaceous armored dinosaur Ankylosaurus - †Ankylosaurus magniventris – type locality for species
- †Anomozamites
- †Aquiladelphis
- †Aquilapollenites
Life restoration of the Early Cretaceous primitive horned dinosaur Aquilops - †Aquilops americanus – type locality for species
- Aralia – or unidentified comparable form
- †Araliaephyllum
- †Araliopsoides
- †Araliopsoides cretacea – or unidentified comparable form
- †Araucarites
- †Arcellites
- †Archaeolamna
- †Archaeotriakis – type locality for genus
- †Archaeotriakis rochelleae – type locality for species
Fossilized shells of the Middle Jurassic ammonoid cephalopod Arcticoceras - †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
- †Asplenium
Shell of a modern Astarte bivalve - †Astarte meeki
- †Astarte morion
- †Astarte packardi – or unidentified comparable form
- †Athrotaxites
- †Athrotaxites berryi – or unidentified comparable form
- †Aublysodon
- †Austrotindaria
- †Avaceratops – type locality for genus
- †Avaceratops lammersi – type locality for species
- Avicula
Life restoration of the Late Cretaceous toothed bird Avisaurus with prey - †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
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B
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- †Baculatisporites
Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites - †Baena
- †Baena callosa – type locality for species
- †Baioconodon
- †Baioconodon nordicus – or unidentified comparable form
- †Bakevellia
Diagram of the known fossil material of the Late Cretaceous dromaeosaurid ("raptor") Bambiraptor - †Bambiraptor feinbergi – type locality for species
- Barbourula – or unidentified comparable form
- †Basilemys
- †Basilemys sinuosa – type locality for species
- †Batodon
- †Belfria – type locality for genus
- †Belfria microphylla – type locality for species
Fossilized skeleton of the Late Cretaceous bony fish Belonostomus - †Bernissartia
- †Biretisporites
- †Borealosuchus
- †Boremys
- †Borissiakoceras
- Brachaelurus
- †Brachyceratops – type locality for genus
- †Brachyceratops montanensis – type locality for species
- †Brachychampsa – type locality for genus
- †Brachychampsa montana – type locality for species
- †Brachychampsa montanus
Fossilized natural mummy of the Late Cretaceous duck-billed dinosaur Brachylophosaurus - †Brachylophosaurus canadensis – type locality for species
- †Buccinammonites – type locality for genus
- †Buccinammonites minimus – type locality for species
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Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus - Campeloma
- †Camptonectes
- Carcharias
- †Cardiaster
- †Carinalestes – type locality for genus
- †Carinalestes murensis – type locality for species
- †Cedrobaena
- †Celastrophyllum – or unidentified comparable form
Life restoration of the Late Cretaceous horned dinosaur 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
- †Chamops
- †Champsosaurus
Life restoration of the Late Cretaceous horned dinosaur Chasmosaurus - Chiloscyllium
- †Chiloscyllium missouriensis – type locality for species
- †Chirostenotes
- Chlamys
- †Chondroceras
- †Chondroceras allani – or unidentified comparable form
- †Chondroceras oblatum
- †Cimexomys
- †Cimolestes
- †Cimoliasaurus
- †Cimolodon
Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys - †Cimolomys clarki – type locality for species
- †Cimolomys gracilis
- †Cimolopteryx
- †Cinnamomoides
- Cladophlebis
- †Claosaurus
- †Claraia
Life restoration of the Late Cretaceous mosasaurid Clidastes - †Clioscaphites
- †Cobbanites
- †Coelostylina
- †Colpodontosaurus
- †Componocancer
- †Compsemys
- †Coniophis
- †Coniopteris
- †Coniopteris bella – or unidentified comparable form
- †Coniopteris hymenophylloides
- †Coniopteris simplex
- †Continuoolithus
- †Contogenys – type locality for genus
- †Contogenys sloani – type locality for species
- †Coriops
- †Corviconodon
- †Corviconodon montanensis – type locality for species
Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Corythosaurus - Crassatella
- †Cremnoceramus
- †Cretolamna
- †Cretorectolobus – type locality for genus
- †Cretorectolobus olsoni – type locality for species
- †Crocodilus
- †Cryptometoicoceras
- Cucullaea
- †Cyathidites
- †Cycadolepis
- †Cycadopites
- †Cyclurus
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- †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 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
- †Diclonius
- †Dictyothykalos
Mounted fossilized skeleton of the Late Cretaceous marsupial relative Didelphodon - †Didymoceras
- †Diettertia
Life restoration of the Late Jurassic long-necked dinosaur Diplodocus - †Doratodon – or unidentified comparable form
- †Dromaeosaurus
- †Dryophyllum – report made of unidentified related form or using admittedly obsolete nomenclature
- †Dunveganoceras
- †Dunveganoceras albertense
- †Dunveganoceras parvum – type locality for species
- †Dunveganoceras pondi
- †Dyadonapites
Illustration of the fossilized pelvis and tail of the Late Cretaceous armored dinosaur Dyoplosaurus
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- †Echinatisporis
- †Ectocentrocristus
- †Ectocentrocristus foxi – type locality for species
- †Ectoconodon
- †Ectoconodon montanensis – type locality for species
- †Edgarosaurus
- †Edmontonia
- †Edmontonia longiceps
- †Edmontonia rugosidens – type locality for species
- †Edmontosaurus
Life restoration of the Late Cretaceous duck-billed dinosaur 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
- †Eodelphis
- †Eopelobates – or unidentified comparable form
A living Equisetum, or horsetail - †Equisetum cascadensis – type locality for species
- †Equisetum laterale
- †Equisetum montanensis
- †Erdtmanipollis
- †Essonodon – type locality for genus
- †Essonodon browni – type locality for species
- †Eubaena
- †Eucrossorhinus
- †Eucrossorhinus microcuspidatus – type locality for species
- †Eumorphotis
- †Eumorphotis amplicostata – type locality for species
- †Eumorphotis ericius – or unidentified comparable form
- †Eumorphotis multiformis
- †Euomphaloceras
Life restoration of the Late Cretaceous armored dinosaur Euoplocephalus - †Eutrephoceras
- †Eutrephoceras montanensis – type locality for species
- †Exiteloceras
- †Exogyra
- †Exostinus
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- †Falepetrus
- Ficus – or unidentified comparable form
- †Fletcherithyris – report made of unidentified related form or using admittedly obsolete nomenclature
- †Foraminisporis
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- †Gastopoda
- †Gervillia
- †Gervillia ussurica – or unidentified comparable form
- †Gilmoremys
Fossilized leaf of the Permian-modern tree Ginkgo - †Ginkgoites
- †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
Mounted fossilized skeleton of the Middle Jurassic-Late Cretaceous mammal Gobiconodon - †Gobiconodon ostromi – type locality for species
- †Goniobasis
- †Gorgosaurus
- †Gorgosaurus libratus – type locality for species
- †Grammatodon
- †Grewipollenites
Interior and exterior of a fossilized shell of the Late Triassic-Eocene marine bivalve Gryphaea - †Gryposaurus
- †Gryposaurus latidens – type locality for species
- †Gryposaurus notabilis
- †Gypsonictops
- †Gypsonictops hypoconus
- †Gypsonictops illuminatus
- †Gypsonictops lewisi – type locality for species
- Gyrodes
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- †Habrosaurus
- †Hadrosaurus
- †Hadrosaurus breviceps – type locality for species
- †Hadrosaurus paucidens – type locality for species
- †Hamites
- †Haptosphenus
- †Hausmannia
- †Helopanoplia
Life restoration of the Late Cretaceous toothed bird Hesperornis - †Hesperornis montana – type locality for species
- †Heteropecten – tentative report
- †Holocrinus
- †Hoploscaphites
- †Hoploscaphites macer – type locality for species
- †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
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- †Idiohamites
- †Idiohamites bispinosus – type locality for species
- †Idiohamites pulchellus – type locality for species
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size - †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
Fossilized skeleton of the Middle Jurassic-Miocene Chimaera relative Ischyodus - †Ischyrhiza
- †Isocyprina – or unidentified comparable form
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Life restoration of the Late Cretaceous horned dinosaur Judiceratops - †Judiceratops tigris – type locality for species
- †Judithemys
K
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- †Kastanoceras – type locality for genus
- †Kastanoceras spiniger – type locality for species
- †Klukia
Life restoration of the Late Cretaceous duck-billed dinosaur Kritosaurus - †Kritosaurus breviceps – or unidentified comparable form
- †Krokolithes
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- †Labrodioctes – type locality for genus
- †Labrodioctes montanensis – type locality for species
- †Laevigatosporites
Fossilized skeleton of the Early Jurassic-Late Cretaceous bony fish 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
- Lepisosteus
- †Leptalestes
- †Leptalestes cooki
- †Leptalestes krejcii
- †Leptalestes prokrejcii
- †Leptalestes toevsi – type locality for species
Life restoration of the Late Cretaceous primitive horned dinosaur Leptoceratops - †Leptochamops
- †Leptochondria
- †Leptopecopites
- †Leptorhynchos – tentative report
- †Lesterwardia – type locality for genus
- †Lesterwardia palustris – type locality for species
- †Liliacidites
- †Lingula
- †Lingularia
- †Lioplacodes
- †Liostrea
- †Lisserpeton – type locality for genus
- †Lisserpeton atlantes
- †Lisserpeton bairdi – type locality for species
- †Lonchidion
Fossilized shell of the Triassic-modern marine bivalve Lopha - †Lucina
- Lunatia
- †Lunatia dakotensis – or unidentified comparable form
- †Lygobius – type locality for genus
- †Lygobius knowltoni – type locality for species
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- †Magadiceramus
- †Magnuviator – type locality for genus
- †Magnuviator ovimonsensis – type locality for species
- †Maiasaura – type locality for genus
- †Maiasaura peeblesorum – type locality for species
- †Marchantiolites
- †Marmarthia
- †Medusaceratops – type locality for genus
- †Medusaceratops lokii – type locality for species
- †Meleagrinella
- †Melvius – type locality for genus
- †Melvius thomasi – type locality for species
- †Meniscoessus
- †Meniscoessus major
- †Meniscoessus robustus – type locality for species
- †Meniscognathus
Life restoration of the Late Cretaceous horned dinosaur Mercuriceratops - †Mercuriceratops gemini – type locality for species
- †Mesodma
- †Metoicoceras
- †Metoicoceras geslinianum
- †Metoicoceras mosbyense – type locality for species
- †Metoicoceras muelleri
- †Metzgeriites
- †Metzgeriites montanensis – type locality for species
- †Micrabacia
- †Microsulcatoceras – type locality for genus
- †Microsulcatoceras puzosiiforme – type locality for species
Life restoration of the Early Cretaceous oviraptorosaur Microvenator - †Microvenator celer – type locality for species
- †Minerisporites
- †Miocidaris
- †Modiolus
- †Monoclonius – type locality for genus
- †Monoclonius crassus – type locality for species
- †Monoclonius recurvicornis – type locality for species
- †Monoclonius sphenocerus – type locality for species
- †Monosulcites
- †Montanalestes
Mounted fossilized skeletons of the Late Cretaceous pterosaur Montanazhdarcho - †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
- †Myalina
- †Myledaphus
Shells washed ashore of Mytilus mussels
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- †Nannometoicoceras
- †Nannometoicoceras nanos – type locality for species
Fossilized skull of the Late Cretaceous tyrannosaur Nanotyrannus, possibly a juvenile Tyrannosaurus rather than a distinct genus - †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
- †Neogastroplites
- †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
Fossilized skeleton of the Late Cretaceous-Eocene bony fish Notogoneus - †Notogoneus montananesis – type locality for species
- †Notogoneus montenensis – type locality for species
- Nucula
- †Nymphaeites
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- †Obamadon – type locality for genus
- †Obamadon gracilis – type locality for species
- †Odaxosaurus
- Odontaspis
- †Odontaspis sanguinei – type locality for species
- †Oklatheridium
- †Oklatheridium wiblei – type locality for species
- †Onchosaurus
Fossilized partial cranium of the Late Cretaceous armored dinosaur Oohkotokia - †Oohkotokia horneri – type locality for species
- †Ophioglypha
- †Ophiomorpha
- †Opisthotriton
- †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
Life restoration of the Late Cretaceous herbivorous dinosaur Oryctodromeus in a burrow - †Oryctodromeus cubicularis – type locality for species
- Ostrea
- †Oxybeloceras
- †Oxytoma
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Life restoration of subadults of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus butting heads - †Pachycephalosaurus wyomingensis – type locality for species
- †Pagiophyllum
- †Palaeobatrachus
- †Palaeolabrus
- †Palaeosaniwa
- †Palaeoscincus – type locality for genus
- †Palaeoscincus costatus – type locality for species
- †Palatobaena
- †Paleopsephurus – type locality for genus
- †Paleopsephurus wilsoni – type locality for species
- †Paleoungulatum – type locality for genus
- †Paleoungulatum hooleyi – type locality for species
Illustration of a fossilized skull of the Late Cretaceous armored dinosaur Panoplosaurus - †Pappotherium
- †Parachondroceras
- †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
- †Paralbula
- †Paramacellodus – or unidentified comparable form
- †Paramacellodus keebleri – type locality for species
- †Paranecturus – type locality for genus
- †Paranecturus garbanii – type locality for species
- †Paranyctoides
Fossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size - †Parapuzosia bradyi – type locality for species
- †Parasaniwa
- †Parataxodium
- †Parazolla – type locality for genus
- †Parazolla heterotricha – type locality for species
- †Parazollopsis – type locality for genus
- †Parazollopsis cascadensis – type locality for species
- †Paronychodon
Micrograph of a fossilized tooth of the Late Cretaceous troodontid Pectinodon - †Pediomys
- †Peneteius – type locality for genus
- †Peneteius aquilonius – type locality for species
- †Penetetrapites
- †Pentacrinus
- †Permophorus
- †Phelopteria
- Pholadomya
Shells in differing orientations of Physa freshwater bladder snails - †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
- †Pistia
- †Pityocladus
- †Pityophyllum
- †Pityosporites
- †Placunopsis
- †Plastomenus
- †Platacodon
- †Platanophyllum
- †Plesiacanthoceras
- †Plesiacanthoceratoides
- †Plesiobaena
- †Pleuromya
- †Pleuromya oblongata – or unidentified comparable form
- †Pleuromya subcompressa
- †Pleuronautilus
- †Pleuronectites – tentative report
- †Plicatolamna
- †Podozamites
- †Polycingulatisporites
Mounted fossilized skeleton of the Late Cretaceous primitive horned dinosaur Prenoceratops - †Prenoceratops pieganensis – type locality for species
- †Prismatoolithus
- †Prismatoolithus hirschi – type locality for species
- †Prismatoolithus levis
- †Pristinuspollenites
- †Proamphiuma
- †Procerberus
- †Prodesmodon
- †Promyalina
- †Promyalina spathi – type locality for species
Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Prosaurolophus - †Prosaurolophus blackfeetensis – type locality for species
- †Protalphadon
- †Protalphadon foxi – type locality for species
- †Protalphadon lulli
- †Protexanites
- †Protocaiman
- †Protocardia
- †Protolambda
- †Protolambda mcgilli – type locality for species
- †?Protolambda clemensi – type locality for species
- †Protolambda florencae
- †Protolambda hatcheri
- †Protolamna
- †Protophyllocladus
- †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
Fossilized mandible of the Late Cretaceous-Paleocene mammal 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
- †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
Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
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- †Quenstedtia – tentative report
- 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
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- †Retinovena – type locality for genus
- †Retinovena fluvialis – type locality for species
- †Retitricolpites
- 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
- †Richardoestesia
- †Rostellites – tentative report
Life restoration of the Late Cretaceous horned dinosaur Rubeosaurus - †Rubeosaurus ovatus – type locality for species
- †Rugocaudia – type locality for genus
- †Rugocaudia cooneyi – type locality for species
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- †Sagenopteris
Life restoration of the Early Cretaceous armored dinosaurs Sauropelta - †Sauropelta edwardsorum – type locality for species
- †Saurornitholestes
- †Scabrastephanocolpites
- †Scapherpeton
- †Scaphites
- †Scaphotrigonia
- †Schizolepis
- †Schizosporis
- †Sciponoceras
- †Scollardius
Fossilized cranium in multiple views of the Late Cretaceous armored dinosaur Scolosaurus - †Scotiophryne – type locality for genus
- †Scotiophryne pustulosa – type locality for species
- †Sequoia
- †Siberiapollis
- †Sohlites
- †Solenoceras
- †Spalacotheridium
- Sphaerium
- †Sphaerotholus
- †Sphaerotholus buchholtzae – type locality for species
- †Sphenopteris
- †Spheroolithus
- †Spheroolithus albertensis
- †Spheroolithus choteauensis – type locality for species
- †Spheroolithus maiasauroides
Life restoration of the Late Cretaceous horned dinosaur Spiclypeus - †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
- †Squatirhina
- †Stantoniella – type locality for genus
- †Stantoniella cretacea – type locality for species
- †Stegoceras
Restoration of the Late Jurassic stegosaur 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
- †Synechodus
- †Synechodus andersoni – type locality for species
- †Synechodus striatus – type locality for species
T
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- †Tancredia
- †Tancredia inornata – or unidentified comparable form
- †Tarrantoceras
- †Tatankacephalus – type locality for genus
- †Tatankacephalus cooneyorum – type locality for species
- †Taxodiaceaepollenites
Life restoration of the Early Cretaceous Iguanodon relative Tenontosaurus - †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
- †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
Mounted fossilized skeleton of the Late Cretaceous horned dinosaur 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
- Trionyx
- †Triprismatoolithus – type locality for genus
- †Triprismatoolithus stephensi – type locality for species
- †Trochicola
- †Trochodendroides
Illustration of fossilized teeth of the Late Cretaceous Troodon - †Troodon formosus – type locality for species
- †Tubercuoolithus – type locality for genus
- †Tubercuoolithus tetonensis – type locality for species
- †Tubulifloridites
- †Tullochelys
- †Turgidodon
- Turritella
- †Tylosaurus
Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus - †Tyrannosaurus rex – type locality for species
U
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- †Ugrosaurus – type locality for genus
- †Ugrosaurus olsoni – type locality for species
- Unio
- †Unionites
V
Contents
- †Valenopsalis
- Valvata – tentative report
- †Varalphadon
- †Veniella
- Vitis – report made of unidentified related form or using admittedly obsolete nomenclature
- Viviparus
Life restorations of the Late Cretaceous marine bivalve Volviceramus
W
Contents
- †Weediaphyllum – type locality for genus
- †Weediaphyllum parkensis – type locality for species
- †Weltrichia
- †Wodehousia
- †Woodwardia – report made of unidentified related form or using admittedly obsolete nomenclature
X
Contents
- †Xenocephalites – tentative report
A view of the fossil shell of Xenophora infundibulum
Y
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Z
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Fossil of the Early Triassic-Eocene cycad-like frond Zamites - †Zapsalis – or unidentified comparable form
- †Zephyrosaurus – type locality for genus
- †Zephyrosaurus schaffi – type locality for species
- †Zlivisporis
- †Zygastrocarcinus
References
- ^ Neil H. Landman; W. James Kennedy; Neal L. Larson; Joyce C. Grier; James W. Grier; Tom Linn (2019). "Description of two species of Hoploscaphites (Ammonoidea, Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western Interior". Bulletin of the American Museum of Natural History. 2019 (427): 1–72. doi:10.1206/0003-0090.427.1.1. hdl:2246/6926. S2CID 91263199.
- Davis, B. M. (2007). "A revision of 'pediomyid' marsupials from the Late Cretaceous of North America" (PDF). Acta Palaeontologica Polonica. 52 (2): 217–256.
- Thomas S. Kelly (2014). "Preliminary report on the mammals from Lane's Little Jaw Site Quarry: a latest Cretaceous (earliest Puercan?) local fauna, Hell Creek Formation, southeastern Montana" (PDF). Paludicola. 10 (1): 50–91.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
| Lists of the prehistoric life of Montana | |
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