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.
A
†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
B
†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
C
†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
D
†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
E
†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
F
†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
G
†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
H
†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