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
Selected Paleozoic taxa of Montana
†Achistrum †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 †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 †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 †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 †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 snyderi – type locality for species †Edmondia †Elrathina Eocaudina †Falcatus †Falcatus falcatus †Favosites †Fenestella †Fenestrella †Geragnostus †Hadronector – type locality for genus †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 †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 †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 †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 †Stethacanthus †Stethacanthus altonensis †Syringopora †Tornoceras †Tylonautilus †Westergaardodina †Wilkingia †Worthenia – tentative report
Mesozoic
Selected Mesozoic taxa of Montana
†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 †Allosaurus †Alphadon †Alphadon attaragos †Alphadon halleyi – type locality for species †Alphadon marshi †Alphadon wilsoni †Alzadasaurus – tentative report Amia †Amphicoelias †Anatotitan †Anatotitan copei †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 †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 †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 †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 †Champsosaurus †Chasmosaurus – or unidentified comparable form Chiloscyllium †Chirostenotes †Chirostenotes elegans Chlamys †Chondroceras †Cimexomys †Cimexomys minor †Cimolestes †Cimolestes incisus †Cimolestes stirtoni †Cimoliasaurus †Cimolodon †Cimolodon nitidus †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 †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 †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 †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 †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 †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 †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 †Hesperornis †Hybodus †Hybodus montanensis – type locality for species †Hypacrosaurus †Hypacrosaurus stebingeri – 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 †Ischyodus †Ischyodus bifurcatus †Ischyrhiza †Ischyrhiza avonicola †Ischyrhiza mira †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 †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