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
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