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

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

Paleozoic

Selected Paleozoic taxa of Colorado

†Actinoceras †Aglaocrinus †Amorphognathus †Amplexus †Archaeocidaris †Astraspis – type locality for genus †Astraspis desiderata – type locality for species †Athyris †Aviculopecten †Calamites †Calamites cistii †Calamites cruciatus †Callipteris †Callipteris lyratifolia – or unidentified comparable form †Camarotoechia †Caninia †Catenipora †Ceraurinus †Charactoceras – tentative report †Chirognathus †Composita †Composita ovata †Conocardium †Cordaites †Cornulites †Crania †Ctenacanthus †Ctenacanthus buttersi †Ctenacanthus furcicarinatus †Cupressocrinites †Cutleria – type locality for genus †Cutleria wilmarthi – type locality for species †Cyclopteris †Cyrtogomphoceras †Cyrtospirifer †Cyrtospirifer animasensis †Cyrtospirifer whitneyi †Echinosphaerites – tentative report †Edestus †Endoceras †Eretmocrinus †Eryops †Euomphalus †Girvanella †Halysites †Isalaux – type locality for genus †Isonema †Kionoceras †Lambeoceras †Lepidodendron †Lepidostrobus †Limnoscelis †Lingula †Meristella †Neospirifer †Neospirifer goreii †Neuropteris †Neuropteris auriculata †Neuropteris gigantea – tentative report †Neuropteris heterophylla †Ophiacodon †Oradectes †Ormoceras †Orthoceras †Oulodus †Paladin – tentative report †Pecopteris †Pecopteris arborescens †Plaesiomys †Platyceras †Platyhystrix †Platyhystrix rugosus †Pugnax †Receptaculites †Samaropsis †Sandia †Seymouria †Sigillaria †Sigillaria elegans – or unidentified comparable form †Sphenophyllum †Sphenopteris †Spirifer †Spirifer centronatus Spirorbis †Spyroceras †Stigmaria †Strepsodiscus – type locality for genus †Strophomena †Syringopora †Taxocrinus †Walchia †Westonoceras

Mesozoic

Selected Mesozoic taxa of Colorado

Acmaea †Adocus †Albanerpeton †Albanerpeton nexuosus †Albertosaurus – tentative report †Allosaurus – type locality for genus †Allosaurus fragilis – type locality for species †Amblotherium – type locality for genus Amia †Amphicoelias – type locality for genus †Amphicoelias altus – type locality for species †Amphicotylus †Amphicotylus lucasii – type locality for species †Anaklinoceras †Anisoceras †Anomia †Anomoepus – tentative report †Apateodus †Apatopus †Apatosaurus – type locality for genus †Apatosaurus ajax – type locality for species †Apatosaurus louisae – type locality for species †Arenicolites Aspideretes Astarte †Atlantosaurus †Atlantosaurus immanis – type locality for species †Axonoceras †Baculites †Baculites aquilaensis †Baculites asper †Baculites clinolobatus – type locality for species †Baculites codyensis †Baculites compressus †Baculites cuneatus †Baculites grandis †Baculites haresi †Baculites mclearni †Baculites meeki – type locality for species †Baculites reesidei †Barosaurus †Basilemys †Bison †Bison alticornis – type locality for species †Borealosuchus †Borealosuchus sternbergii †Brachauchenius – or unidentified comparable form †Brachiosaurus – type locality for genus †Brachiosaurus altithorax – type locality for species †Brachychampsa †Brachychampsa montana †Brachyphyllum †Brontosaurus †Brontosaurus excelsus †Brontosaurus yahnahpin †Calycoceras †Camarasaurus – type locality for genus †Camarasaurus grandis †Camarasaurus lewisi †Camarasaurus supremus – type locality for species †Camptosaurus – type locality for genus †Camptosaurus dispar – type locality for species Carcharias †Caririchnium †Cedrobaena †Ceratodus – type locality for genus †Ceratosaurus – type locality for genus †Ceratosaurus nasicornis – type locality for species Cerithiopsis †Champsosaurus Chara †Chelonipus †Chinlea †Chirotherium †Chirotherium lulli †Cimolichthys †Cimolichthys nepaholica †Cimolodon – or unidentified comparable form †Cimolomys †Cionodon – type locality for genus †Cionodon arctatus – type locality for species †Cirroceras †Clidastes †Coelophysis – tentative report †Coelurus †Coelurus fragilis †Compsemys †Coniasaurus Corbula †Crenella †Cretolamna †Cretolamna appendiculata †Cretoxyrhina †Cretoxyrhina mantelli Cucullaea Cuspidaria †Didymoceras †Didymoceras cheyennense †Didymoceras stevensoni †Dinehichnus †Dinochelys †Diplodocus – type locality for genus †Diplodocus lacustris – type locality for species †Diplodocus longus – type locality for species †Diplosaurus Discinisca †Discoscaphites †Discoscaphites conradi †Docodon †Dorsetisaurus †Dorsetochelys †Dryosaurus †Dryosaurus altus †Edmontonia †Edmontosaurus †Edmontosaurus regalis – type locality for species Eilenodon – type locality for genus †Elopopsis †Enchodus †Enchodus gladiolus – or unidentified comparable form †Enchodus shumardi – or unidentified comparable form †Equisetum †Eubrontes †Eubrontes giganteus †Eucalycoceras †Euomphaloceras †Eutrephoceras †Eutretauranosuchus – type locality for genus †Eutretauranosuchus delfsi – type locality for species †Exiteloceras †Exogyra †Fagesia Ficus †Forresteria †Fruitachampsa – type locality for genus †Fruitachampsa callisoni – type locality for species †Fruitadens – type locality for genus †Fruitadens haagarorum – type locality for species †Fruitafossor – type locality for genus †Fruitafossor windscheffeli – type locality for species †Galeamopus †Galeamopus pabsti †Glirodon †Glirodon grandis †Glyptops †Goniopholis †Grallator †Hallopus †Hallopus victor – type locality for species †Haplocanthosaurus – type locality for genus †Haplocanthosaurus delfsi – type locality for species †Haplocanthosaurus priscus – type locality for species †Hemicalypterus †Herrickiceras †Hoploscaphites †Hoploscaphites birkelundae †Hoploscaphites nicolletii †Hulettia – report made of unidentified related form or using admittedly obsolete nomenclature †Hypsirophus – type locality for genus †Ichthyodectes †Ignotornis – type locality for genus †Inoceramus †Inoceramus altus †Inoceramus altusiformis †Inoceramus anomalus †Inoceramus arnoldi †Inoceramus balticus †Inoceramus brancoiformis †Inoceramus bueltenensis †Inoceramus cordiformis †Inoceramus crippsi – or unidentified related form †Inoceramus deformis †Inoceramus erectus †Inoceramus flavus †Inoceramus grandis †Inoceramus longealatus †Inoceramus muelleri - or unidentified loosely related form †Inoceramus oblongus †Inoceramus pictus †Inoceramus prefragilis †Inoceramus rutherfordi – or unidentified comparable form †Inoceramus tenuistriatus – tentative report †Ischyrhiza †Ischyrhiza avonicola – or unidentified comparable form †Jeletzkytes †Jeletzkytes brevis †Jeletzkytes dorfi †Jeletzkytes nodosus †Kepodactylus – type locality for genus †Kepodactylus insperatus – type locality for species †Laosaurus – report made of unidentified related form or using admittedly obsolete nomenclature Lepisosteus – tentative report †Leptalestes – tentative report †Leptalestes cooki †Leptolepis – or unidentified comparable form Lima †Lingula †Lioestheria †Lisserpeton †Lisserpeton bairdi †Lonchidion †Lucina †Macelognathus †Magnoavipes †Marshosaurus – or unidentified comparable form †Meniscoessus †Meniscoessus collomensis – type locality for species †Meniscoessus robustus – or unidentified comparable form †Mesadactylus – type locality for genus †Mesadactylus ornithosphyos – type locality for species †Mesodma †Mesodma formosa – or unidentified comparable form †Mesojassoides – type locality for genus †Mesojassoides gigantea – type locality for species †Metoicoceras †Metoicoceras geslinianum †Micropycnodon †Modiolus †Morosaurus †Morrolepis †Myledaphus †Myledaphus bipartitus †Mymoorapelta – type locality for genus †Mymoorapelta maysi – type locality for species Myrica †Nanosaurus – type locality for genus †Nanosaurus agilis – type locality for species †Nanosaurus rex Natica †Neocardioceras †Neocardioceras densicostatum – type locality for species †Neocardioceras juddii †Neocardioceras laevigatum †Neocardioceras minutum †Neocardioceras uptonense †Neoptychites †Nostoceras †Nostoceras approximans – or unidentified comparable form †Nostoceras larimerense – type locality for species †Nostoceras monotuberculatum †Nostoceras obtusum – or unidentified comparable form †Nostoceras splendidum – or unidentified comparable form Nucula †Nucula percrassa †Odaxosaurus †Odaxosaurus piger †Opisthias †Opisthotriton †Ornitholestes – tentative report †Ornithomimipus †Ornithomimus – type locality for genus †Ornithomimus velox – type locality for species Ostrea †Othnielia – tentative report †Othnielosaurus †Othnielosaurus consors †Oxytoma †Pachycephalosaurus †Pachyrhizodus †Pachyrhizodus minimus †Palaeobalistum †Palaeopteryx – type locality for genus †Parabrontopodus – type locality for genus †Paramacellodus †Paressonodon – type locality for genus †Parikimys – type locality for genus †Parviraptor †Pentaceratops †Pentaceratops sternbergii †Pinna †Placenticeras †Placenticeras meeki †Platyceramus †Platyceramus ahsenensis †Platyceramus cycloides †Platyceramus mantelli - or unidentified loosely related form †Platyceramus platinus †Platyognathus †Plesiobaena †Polyonax – type locality for genus †Polyonax mortuarius – type locality for species †Preprismatoolithus †Priacodon †Priacodon fruitaensis – type locality for species †Prognathodon †Prognathodon overtoni †Prognathodon stadtmani – type locality for species Propeamussium †Protocardia †Protosphyraena Prunus †Pseudoperna †Pseudoperna congesta †Pseudotetrasauropus – tentative report †Pteraichnus †Ptychodus †Ptychodus anonymus †Ptychodus decurrens †Ptychodus occidentalis †Ptychodus whipplei Pycnodonte †Pycnodonte newberryi Rhinobatos †Rhinobatos incertus †Rosselia †Saurillodon †Scapherpeton †Scaphites †Scaphites binneyi †Scaphites depressus †Scaphites hippocrepis – or unidentified comparable form †Scaphites nodosus †Scoyenia †Selaginella †Semionotus †Sphenodiscus †Sphenodiscus pleurisepta Squalicorax †Squalicorax curvatus †Squalicorax falcatus †Squalicorax pristodontus †Squatirhina †Squatirhina americana †Stegosaurus – type locality for genus †Stegosaurus armatus – type locality for species †Stegosaurus stenops – type locality for species †Stegosaurus ungulatus †Stenomyti – type locality for genus †Stenomyti huangae – type locality for species †Stokesosaurus – or unidentified comparable form †Supersaurus – type locality for genus †Supersaurus vivianae – type locality for species Tellina †Tenea Teredo †Thalassomedon – type locality for genus †Thalassomedon hanningtoni – type locality for species †Theiophytalia – type locality for genus †Theiophytalia kerri – type locality for species †Therangospodus – or unidentified comparable form †Thescelosaurus †Titanosaurus †Titanosaurus montanus – type locality for species †Torosaurus †Torosaurus latus †Torvosaurus – type locality for genus †Torvosaurus tanneri – type locality for species †Treptichnus †Triceratops †Triceratops galeus – type locality for species †Triceratops horridus †Trinacromerum – or unidentified comparable form Turritella †Tylosaurus †Tylosaurus proriger †Tyrannosaurus †Tyrannosaurus rex †Vascoceras Viviparus †Volviceramus †Walteria – type locality for genus †Watinoceras †Watinoceras coloradoense – type locality for species †Websteria †Xiphactinus †Xiphactinus audax

Cenozoic

Selected Cenozoic taxa of Colorado

Abies †Absyrtus †Acalles Abies †Absyrtus †Acalles Acer †Acilius Acris †Acrostichum †Adalia †Adelopsyche – type locality for genus †Adocus Aegialia †Aelurodon †Aepycamelus †Aepycamelus giraffinus