List of the prehistoric life of Colorado on:
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This list of the prehistoric life of Colorado contains the various prehistoric life-forms whose fossilized remains have been Scientific literature, reported from Paleontology in Colorado, within the US state of Colorado.
†''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 (genus), Caninia''
* 
†''Catenipora''
* †''Ceraurinus''
* †''Charactoceras'' – tentative report
* †''Chirognathus''
* †''Composita''
** †''Composita ovata''
* †''Conocardium''
* †''Cordaites''
* †''Cornulites''
* †''Crania (brachiopod), Crania''
* †''Ctenacanthus''
** †''Ctenacanthus buttersi''
** †''Ctenacanthus furcicarinatus''
* †''Cupressocrinites''
* 
†''Cutleria (animal), 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 (genus), Lingula''
* †''Meristella''
* †''Neospirifer''
** †''Neospirifer goreii''
* †''Neuropteris''
** †''Neuropteris auriculata''
** †''Neuropteris gigantea'' – tentative report
** †''Neuropteris heterophylla''
* 
†''Ophiacodon''
* †''Oradectes''
* †''Ormoceras''
* †''Orthoceras''
* †''Oulodus''
* †''Paladin (trilobite), Paladin'' – tentative report
* †''Pecopteris''
** †''Pecopteris arborescens''
* †''Plaesiomys''
* †''Platyceras''
* 
†''Platyhystrix''
** †''Platyhystrix rugosus''
* †''Pugnax''
* †''Receptaculites''
* †''Samaropsis''
* †''Sandia (brachiopod), 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''
†''Allosaurus'' – type locality for genus
** †''Allosaurus fragilis'' – type locality for species
* †''Amblotherium'' – type locality for genus
* ''Amia (genus), Amia''
* †''Amphicoelias'' – type locality for genus
** †''Amphicoelias altus'' – type locality for species
* †''Amphicotylus''
** †''Amphicotylus lucasii'' – type locality for species
* †''Anaklinoceras''
* †''Anisoceras''
* †''Anomia (genus), 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 (genus), 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 (genus), Crenella''
* †''Cretolamna''
** †''Cretolamna appendiculata''
* †''Cretoxyrhina''
** †''Cretoxyrhina mantelli''
* ''Cucullaea''
* ''Cuspidaria (bivalve), 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 (genus), Lingula''
* †''Lioestheria''
* †''Lisserpeton''
** †''Lisserpeton bairdi''
* †''Lonchidion''
* †''Genus, 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 (bivalve), 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 (bivalve), 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 (bivalve), 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 (sponge), Walteria'' – type locality for genus
* †''Watinoceras''
** †''Watinoceras coloradoense'' – type locality for species
* †''Websteria''
* †''Xiphactinus''
** †''Xiphactinus audax''
''Abies''
* †''Absyrtus''
* †''Acalles''
* ''Acer (plant), Abies''
* †''Absyrtus''
* †''Acalles''
* ''Acer (plant), Acer''
* †''Acilius (genus), Acilius''
* ''Acris''
* †''Acrostichum''
* †''Adalia (beetle), Adalia''
* †''Adelopsyche'' – type locality for genus
* †''Adocus''
* ''Aegialia''
* †''Aelurodon''
* 
†''Aepycamelus''
** †''Aepycamelus giraffinus''
* †''Aeshna''
* ''Agabus''
* †''Agallia''
* †''Agathemera''
* ''Agelaius''
* †''Agnotocastor''
* ''Agrilus''
* ''Agriotes''
* †''Agromyza''
* †''Agulla (snakefly), Agulla''
** †''Agulla protomaculata'' – type locality for species
* 
†''Ailanthus''
* †''Aletodon''
* ''Aleurites''
* †''Alforjas'' – tentative report
* †''Allognathosuchus''
* †''Allophylus''
* ''Altica''
* †''Alysia''
* ''Amara (genus), Amara''
* †''Amauropilio''
* †''Amblycorypha'' – tentative report
* †''Amblyteles''
* †''Ambystoma''
** †''Ambystoma tigrinum''
* 
†''Amebelodon''
* ''Amelanchier''
* ''Amia (genus), Amia''
* †''Ammophila''
* †''Ampelopsis''
* †''Amphechinus''
* †''Amphicerus''
* †''Amphicyon''
** †''Amphicyon galushai''
** †''Amphicyon ingens''
* 
†''Amphimachairodus''
* †''Anabrus''
* ''Anas''
* †''Anasa''
* †''Anatis''
* †''Anchitherium''
* ''Andrena''
* †''Andrias''
* †''Andricus''
* †''Anelaphus''
* †''Anemia''
* †''Angustidens''
* ''Anisotoma''
* †''Anobium''
* †''Anomala''
* †''Anomalon''
* ''Anser (bird), Anser''
* †''Antas (genus), Antas''
* ''Anthaxia''
* †''Antherophagus''
* 
†''Anthidium''
** †''Anthidium exhumatum'' – type locality for species
** †''Anthidium scudderi'' – type locality for species
* †''Anthomyia''
* ''Anthonomus''
* †''Anthophora''
* ''Antilocapra''
** †''Antilocapra americana''
* †''Antocha''
* ''Aphaenogaster''
** †''Aphaenogaster donisthorpei'' – type locality for species
** †''Aphaenogaster mayri'' – type locality for species
* †''Aphelops''
* ''Aphodius''
* ''Aphrophora''
* ''Apion''
* †''Apolysis''
* ''Aquila (genus), Aquila''
** †''Aquila chysaetos''
* ''Araneus''
* †''Archaeotherium''
* †''Archimyrmex'' – type locality for genus
** †''Archimyrmex rostratus'' – type locality for species
* †''Archiponera'' – type locality for genus
** †''Archiponera wheeleri'' – type locality for species
* 
†''Arctocyon''
* †''Argia''
* †''Arhopalus''
* †''Aristolochia''
* †''Artocarpus''
* †''Asimina''
* ''Asio''
* †''Asplenium''
* †''Aster (genus), Aster''
* †''Astronium''
* ''Ataenius''
* †''Athalia''
* 
†''Athous''
* †''Athyana''
* †''Attagenus''
* †''Auraria (genus), Auraria'' – type locality for genus
* ''Aythya''
** †''Aythya affinis''
** †''Aythya americana''
* †''Aztlanolagus''
* †''Baena''
* †''Baris (genus), Baris''
* 
†''Barylambda''
* †''Braconid wasp, Bassus''
* †''Bathornis'' – type locality for genus
** †''Bathornis veredus'' – type locality for species
* †''Bathygenys''
* †''Bathyopsis''
* †''Belyta''
* ''Bembidion''
** †''Bembidion constricticolle''
* †''Bembidium''
* †''Beris''
* ''Betula''
* ''Bibio''
* †''Bibiodes''
* †''Bidessus''
* ''Bison''
** †''Bison antiquus'' – or unidentified comparable form
** †''Bison latifrons''
* †''Blechnum''
* ''Bledius''
* ''Boletina''
* †''Borealosuchus''
* †''Borophagus''
** †''Borophagus pugnator''
* †''Brachinus''
* †''Brachycrus''
* ''Brachylagus''
* †''Brachyprotoma''
** †''Brachyprotoma obtusata''
* †''Brachypsalis''
* 
†''Brachyrhynchocyon''
* †''Brachyspathus'' – type locality for genus
* ''Bracon''
* †''Bruchus''
* ''Horned owl, Bubo''
** †''Bubo virginianus''
* ''Bufo''
** †''Bufo cognatus''
** †''Bufo woodhousei''
* †''Buprestis''
* †''Bursera''
* 
''Buteo''
* †''Caesalpinia''
* †''Calcarius''
** †''Calcarius lapponicus''
** †''Calcarius ornatus''
* †''Calippus (genus), Calippus''
* †''Caliroa''
* †''Callimoxys''
* †''Callomyia'' – tentative report
* ''Calosoma''
* †''Calyptapis'' – type locality for genus
** †''Calyptapis florissantensis'' – type locality for species
* 
†''Camelops''
** †''Camelops hesternus''
* ''Camponotus''
* ''Canis''
** †''Canis edwardii'' – or unidentified comparable form
** †''Canis latrans''
* †''Cantius''
** †''Cantius abditus''
** †''Cantius frugivorus''
** †''Cantius mckennai''
** †''Cantius ralstoni''
* †''Capnobotes''
* †''Capsus''
* 
''Carabus''
* †''Cardiophorus''
* †''Cardiospermum''
* †''Carpocyon''
* ''Carpodacus''
** †''Carpodacus cassinii''
* †''Carpophilus''
* ''Carya''
* ''Castanea (plant), Castanea''
* †''Catopsalis''
** †''Catopsalis alexanderi'' – type locality for species
* †''Cecidomyia'' – tentative report
* ''Cedrela''
* †''Celastrus''
* ''Celtis''
* †''Centron (weevil), Centron'' – type locality for genus
* †''Ceratina''
* 
†''Ceratosuchus'' – type locality for genus
** †''Ceratosuchus burdoshi'' – type locality for species
* †''Ceraturgus''
* ''Cercidiphyllum''
* ''Cercis''
* †''Cercocarpus''
* †''Cercopis''
* ''Cervus''
** †''Cervus elaphus''
* ''Ceutorhynchus''
* ''Chaetodipus''
** †''Chaetodipus hispidus''
* †''Chalcis''
* †''Chalybion''
* †''Chamaecyparis''
* 
†''Chamaedorea''
* ''Charina''
* †''Chauliognathus''
* ''Cheilosia''
* †''Chelonus''
* †''Chilocorus''
* †''Chionaemopsis'' – type locality for genus
* ''Chironomus''
* ''Chondestes''
** †''Chondestes grammacus''
* †''Chriacus''
* †''Chrysis (wasp), Chrysis''
* †''Chrysobothris''
* †''Chrysogaster''
* ''Chrysomela''
* †''Cicada''
* †''Cicadella''
* †''Cimbex''
* †''Cimexomys''
** †''Cimexomys arapahoensis'' – type locality for species
** †''Cimexomys minor''
* 
''Cinnamomum''
* ''Cissus''
* †''Cixius'' – tentative report
* †''Cladius (genus), Cladius''
* †''Cladura''
* †''Clastoptera''
* †''Cleonus''
* †''Closterocoris''
** †''Closterocoris elegans'' – type locality for species
* †''Clubiona''
* †''Clytus''
* †''Coccinella''
* †''Coeliodes''
* ''Colaptes''
** 
†''Colaptes auratus''
* †''Colaspis''
* †''Collops''
* †''Colopterus''
* †''Colubrina''
* †''Compsemys''
* †''Coniatus''
* ''Conotelus''
** †''Conotelus obscurus''
* †''Conotrachelus''
* †''Conzattia''
* †''Copecion''
* †''Copelemur''
* †''Copidita''
* ''Corixa''
* †''Corizus''
* †''Cormocyon''
* †''Cormohipparion''
* ''Cornus''
* ''Corticaria''
* ''Corvus''
** †''Corvus brachyrhynchos''
** †''Corvus corax''
* †''Corylus''
* 
†''Coryphodon''
* ''Cossonus''
* †''Cotinus''
* †''Crabro''
* †''Cratacanthus''
* ''Crataegus''
* ''Crotalus''
** †''Crotalus viridis''
* †''Croton''
* †''Cryptocephalus''
* †''Cryptocheilus''
* ''Cryptophagus''
* ''Cryptorhynchus''
* †''Cryptus''
* 
''Culex''
* †''Curculio''
* †''Cuterebra''
* †''Cyclotrachelus''
* †''Cydamus''
* †''Cylindrotoma''
* †''Cynarctoides''
** †''Cynarctoides acridens''
* †''Cynelos''
* ''Cynomys''
* †''Cyphomyia''
* †''Cypris''
* †''Daphne (plant), Daphne''
* ''Daphnia''
* 
†''Daphoenus''
* †''Davidia''
* †''Denaeaspis'' – type locality for genus
** †''Denaeaspis chelonopsis'' – type locality for species
* †''Dennstaedtia''
* †''Dermatobia''
* †''Dermestes''
* †''Diabrotica''
* †''Diacodexis''
* †''Dialysis (fly), Dialysis''
* ''Diamesa''
* †''Dianthidium''
* †''Diceratherium''
* †''Dicerca''
* ''Dicranomyia''
* †''Dicranota''
* †''Dictyla''
* †''Didymictis''
* †''Didymosphaeria''
* †''Dilophodon''
* 
†''Dinictis''
* †''Dinohippus''
* †''Dioctria''
* ''Dioscorea''
* †''Diploptera''
* ''Diplotaxis'' – tentative report
* ''Diplotaxis''
* ''Dipodomys''
** †''Dipodomys ordii''
* ''Dipteronia''
* †''Dissacus''
* †''Docimus'' – type locality for genus
* ''Dodonaea''
* 
''Dolichoderus''
** †''Dolichoderus antiquus'' – type locality for species
** †''Dolichoderus kohlsi'' – type locality for species
** †''Dolichoderus rohweri'' – type locality for species
* †''Dominickus'' – type locality for genus
** †''Dominickus castnioides'' – type locality for species
* †''Domnina (genus), Domnina''
* ''Donacia''
* ''Dorytomus''
* †''Doxocopa''
* †''Drassonax''
* 
†''Dromomeryx''
** †''Dromomeryx borealis'' – type locality for species
* †''Dryobius''
* ''Dryopteris''
* ''Dyschirius''
* †''Dysdercus''
* †''Echmatemys''
* †''Ectobius''
* †''Ectocion''
* †''Ectoconus''
* †''Elaeomyrmex'' – type locality for genus
** †''Elaeomyrmex coloradensis'' – type locality for species
** †''Elaeomyrmex gracilis'' – type locality for species
* †''Elaphidion''
* ''Elaphropus''
* †''Elater''
* ''Eleodes''
* †''Emiliana'' – type locality for genus
** †''Emiliana alexandri'' – type locality for species
* †''Empis''
* †''Enallagma''
* ''Engelhardtia''
* ''Enochrus''
* †''Entimus''
* 
†''Eobasileus''
** †''Eobasileus cornutus''
* †''Eocuculus'' – type locality for genus
* †''Eogryllus''
* †''Eohippus''
** †''Eohippus angustidens''
* †''Eosacantha'' – type locality for genus
** †''Eosacantha delocranioides'' – type locality for species
* †''Eotitanops''
* ''Ephedra (plant), Ephedra''
* †''Ephemera''
* †''Epicaerus''
* ''Epicauta''
* †''Epicyon''
** †''Epicyon haydeni''
* †''Epihippus''
* ''Epuraea''
* †''Epyris''
* †''Equisetum''
* ''Equus (genus), Equus''
** †''Equus conversidens''
** †''Equus francisci''
** 
†''Equus scotti'' – or unidentified comparable form
** †''Equus simplicidens''
* ''Eremophila (bird), Eremophila''
** †''Eremophila alpestris''
* ''Erethizon''
* ''Eriocampa''
* †''Eriophyes'' – tentative report
* †''Eristalis''
* †''Ernobius''
* †''Ethmia''
* †''Eubazus''
* †''Eucnemis''
* †''Eucommia''
* ''Eugenia''
* 
†''Eulithomyrmex'' – type locality for genus
** †''Eulithomyrmex rugosus'' – type locality for species
** †''Eulithomyrmex striatus'' – type locality for species
* †''Euparius''
* ''Euphorbia''
* †''Eurytoma''
* ''Eutamias''
** †''Eutamias minimus'' – or unidentified comparable form
* †''Exochus''
* ''Fagus (plant), Fagus''
* ''Falcipennis''
* ''Falco (genus), Falco''
** †''Falco sparverius''
* ''Ficus''
* †''Florissantia (plant), Florissantia'' – type locality for genus
** †''Florissantoraphidia funerata'' – type locality for species
* ''Formica''
* †''Fornax''
* †''Fraxinus''
* †''Fulgora''
* †''Coot, Fulica''
** †''Fulica americana''
* †''Gaurotes''
* †''Geocoris''
* ''Geomys''
** †''Geomys bursarius''
* †''Geron (insect), Geron'' – tentative report
* ''Gerris''
* †''Gigantocamelus''
* †''Glossina'' – type locality for genus
* ''Glyptostrobus''
* ''Gnophomyia''
* †''Gomphocerus''
* 
†''Gomphotherium''
* †''Gorytes''
* †''Grammoptera''
* †''Gyaclavator'' – type locality for genus
** †''Gyaclavator kohlsi'' – type locality for species
* †''Gymnopternus''
* †''Gymnorhinus''
* †''Hadrianus (genus), Hadrianus''
* ''Halesia''
* †''Hapalodectes''
* †''Haplolambda''
* ''Harpalus''
* †''Helaletes''
* †''Helichus''
* †''Hellwigia''
* ''Helophorus''
* †''Hemiauchenia''
** †''Hemiauchenia macrocephala''
* 
†''Heptodon''
* †''Heriades''
* †''Herpetotherium''
** †''Herpetotherium fugax''
** †''Herpetotherium knighti''
* ''Hersiliola''
* †''Hesperocyon''
* ''Heterodon''
** †''Heterodon nasicus''
* †''Hexerites'' – type locality for genus
** †''Hexerites primalis'' – type locality for species
* †''Heyderia''
* ''Holbrookia''
** †''Holbrookia maculata''
* †''Holcorpa'' – type locality for genus
** †''Holcorpa maculosa'' – type locality for species
* †''Homogalax''
* †''Hoplia''
* †''Hoplocampa''
* †''Hoplochelys''
* †''Humulus''
* 
†''Hyaenodon''
** †''Hyaenodon crucians''
** †''Hyaenodon horridus''
** †''Hyaenodon mustelinus''
* †''Hydnobius''
* ''Hydrangea''
* ''Hydriomena''
* †''Hydriomena? protrita'' – tentative report
* ''Hydrobius''
** †''Hydrobius fuscipes''
* †''Hydromystria''
* ''Hydrophilus (insect), Hydrophilus''
* ''Hydroporus''
* ''Hydropsyche''
* †''Hydroptila''
* ''Hygrotus''
* †''Hylobius''
* †''Hymenophyllum''
* †''Hyopsodus''
* †''Hypertragulus''
* †''Hypisodus''
* †''Hypohippus''
* †''Hypolagus''
* †''Hyporhina''
** †''Hyporhina galbreathi'' – type locality for species
* †''Hyrachyus''
* 
†''Hyracodon''
* †''Hyracotherium''
** †''Hyracotherium vasacciense''
* †''Ichneumon (genus), Ichneumon''
* ''Ilex''
* †''Indusia''
* †''Iridomyrmex''
** †''Iridomyrmex florissantius'' – type locality for species
** †''Iridomyrmex obscurans'' – type locality for species
* †''Ischyromys''
* †''Isomira''
* †''Isothea'' – type locality for genus
* †''Isotrilophus''
* †''Iulus''
* †''Jadera''
* †''Janus (genus), Janus''
* ''Jassus'' – tentative report. ''Lapsus calami'' of ''Iassus (leafhopper), Iassus''.
* †''Judolia''
** †''Judolia antecurrens'' – type locality for species
* 
''Juglans''
* ''Junco''
** †''Junco hyemalis''
* †''Juncus''
* †''Kalmia''
* †''Kimbetohia''
* ''Koelreuteria''
* †''Lacon (beetle), Lacon''
* †''Lagopus''
** †''Lagopus leucurus''
* †''Lambdotherium''
* †''Lapton (biology), Lapton''
* 
''Larus''
* ''Lasiopodomys''
* ''Lasius''
* ''Lathrobium''
* ''Laurus''
* †''Lebia''
* †''Leia''
* †''Lema (genus), Lema''
* ''Lemmiscus''
** †''Lemmiscus curtatus''
* ''Lepisosteus''
* †''Leptauchenia''
* †''Leptis''
* †''Leptocyon''
* 
†''Leptomeryx''
* †''Leptomorphus''
* ''Leptophloeus''
* †''Leptostylus''
* †''Leptura''
* ''Lepus''
** †''Lepus townsendii''
* †''Leucosticte''
** †''Leucosticte atrata''
** †''Leucosticte tephrocotis''
* †''Leucozona''
* †''Ligyrocoris''
* †''Ligyrus''
* 
†''Limnephilus''
* †''Limnobium''
* †''Limnophila (fly), Limnophila''
* †''Limonius''
* ''Lindera''
* †''Linnaea'' – type locality for genus
* †''Linyphia''
* †''Liometopum''
** †''Liometopum miocenicum'' – type locality for species
** †''Liometopum scudderi'' – type locality for species
* †''Lithocharis''
* 
†''Lithodryas'' – type locality for genus
** †''Lithodryas styx'' – type locality for species
* †''Locusta''
* ''Lomatia''
* ''Longitarsus''
* ''Lontra''
** †''Lontra canadensis'' – or unidentified comparable form
* †''Lucanus (genus), Lucanus''
* †''Lycosa''
* †''Lygaeus''
* ''Lygodium''
* ''Lynx''
** †''Lynx rufus''
* ''Lytta''
* 
''Macrocranion''
* †''Macrodactylus''
* †''Macrophya''
* †''Macrorhoptus''
* ''Magdalis''
* ''Magnolia''
* ''Mahonia''
* †''Maiorana (genus), Maiorana''
* †''Malachius''
* †''Malus''
* †''Mammuthus''
** 
†''Mammuthus columbi''
* ''Marmota''
** †''Marmota flaviventris''
* ''Martes''
* †''Megacerops''
* ''Megachile''
* †''Megacyllene''
* †''Megahippus''
* †''Megalictis''
* †''Megapenthes''
* †''Megatylopus''
* †''Melanactes''
* †''Melanophila''
* †''Melieria''
* †''Melittomma''
* †''Mellinus''
* ''Melospiza''
** †''Melospiza lincolnii''
* †''Meniscotherium''
* 
†''Menoceras''
* ''Mephitis (genus), Mephitis''
** †''Mephitis mephitis''
* †''Merychippus''
** †''Merychippus sejunctus''
* †''Merychyus''
* †''Merycochoerus''
* †''Merycodus''
* †''Merycoidodon'' – type locality for genus
* †''Mesatirhinus''
* †''Mesochorus''
* †''Mesocyon''
* †''Mesodma''
** †''Mesodma hensleighi''
* †''Mesohippus''
* †''Mesoleptus''
* †''Mesonyx''
** †''Mesonyx obtusidens''
* †''Mesostenus''
* ''Messor''
* 
†''Metacheiromys''
* ''Metachroma''
* †''Metarhinus''
* ''Metasequoia''
** †''Metasequoia occidentalis''
* †''Miacis''
* ''Miagrammopes''
* †''Michenia''
* †''Microplitis''
* †''Microsyops''
* †''Microtomarctus''
* ''Microtus''
** †''Microtus californicus'' – or unidentified comparable form
** †''Microtus longicaudus''
** †''Microtus ochrogaster''
* †''Mimoperadectes''
* †''Mindarus'' – type locality for genus
* †''Miniochoerus''
* †''Miodytiscus'' – type locality for genus
* †''Miohippus''
* †''Miomyrmex''
** †''Miomyrmex impactus'' – type locality for species
** †''Miomyrmex striatus'' – type locality for species
* 
†''Miracinonyx''
** †''Miracinonyx inexpectatus'' – or unidentified comparable form
** †''Miracinonyx studeri''
* †''Monosaulax''
* ''Mordella''
** †''Mordella atrata'' – or unidentified comparable form
** †''Mordella lapidicola'' – type locality for species
** †''Mordella priscula'' – type locality for species
** †''Mordella stygia'' – type locality for species
* ''Mordellistena''
** †''Mordellistena florissantensis'' – type locality for species
** †''Mordellistena nearctica'' – type locality for species
** †''Mordellistena scudderiana'' – type locality for species
** †''Mordellistena smithiana'' – type locality for species
* †''Moropus''
* ''Morus''
* ''Musca''
* ''Mustela''
** †''Mustela richardsonii''
** †''Mustela nigripes''
* †''Myas''
* †''Mycetophagus''
* ''Mycetoporus''
* ''Myrica''
* ''Myrmica''
* ''Nebria''
* †''Nemognatha''
* †''Neoliotomus''
** †''Neoliotomus conventus''
** †''Neoliotomus ultimus''
* ''Neogale''
** ''Neogale frenata''
** ''Neogale vison''
* ''Neotoma''
** †''Neotoma cinerea''
* †''Nepa (insect), Nepa''
* †''Nephila''
* †''Netelia''
* †''Nicocles (fly), Nicocles''
* 
†''Notharctus''
** †''Notharctus robustior''
* ''Notonecta''
* ''Numenius (bird), Numenius''
** †''Numenius madagascariensis''
* †''Numitor'' – type locality for genus
* †''Nyctea''
** †''Nyctea scandiaca''
* ''Nymphaea''
* ''Nysius''
* †''Nyssa (plant), Nyssa''
* ''Ochotona''
** †''Ochotona princeps''
* †''Odaxosaurus'' – or unidentified comparable form
** †''Odaxosaurus piger''
* ''Odocoileus''
** 
†''Odocoileus hemionus''
* †''Odynerus''
* †''Oedipoda''
* †''Ogygoptynx'' – type locality for genus
* †''Oligoaeschna'' – type locality for genus
* †''Oligomerus''
* †''Oligotricha''
* ''Omalium''
* ''Omus''
* ''Ondatra''
* †''Oodectes''
* ''Ophisaurus''
* ''Ophryastes''
* †''Ophyra''
* †''Opisthotriton''
* †''Orchelimum''
* ''Orchestes''
* ''Oreamnos'' – or unidentified comparable form
** 
†''Oreamnos harringtoni''
* †''Oreopanax''
* †''Orohippus''
* †''Orontium''
* †''Orphilus''
* †''Orthocentrus''
* †''Osmanthus''
* †''Osmunda''
** †''Osmunda greenlandica''
* †''Otiorhynchus''
* ''Ovis''
** †''Ovis canadensis''
* †''Oxyacodon''
* 
†''Oxyaena''
* †''Oxycera''
* †''Oxyomus''
* †''Pachyaena''
* †''Paederus''
* †''Palaeogale''
* †''Palaeolagus''
* †''Palaeonictis''
* †''Palaeosinopa''
** †''Palaeospiza bella''
* 
†''Palaeosyops'' – type locality for genus
* †''Palaeovespa'' – type locality for genus
** †''Palaeovespa florissantia'' – type locality for species
** †''Palaeovespa gillettei'' – type locality for species
** †''Palaeovespa relecta'' – type locality for species
** †''Palaeovespa scudderi'' – type locality for species
** †''Palaeovespa wilsoni'' – type locality for species
* †''Palatobaena''
* †''Panax''
* †''Panorpa''
* †''Paracynarctus''
* †''Parahippus''
** †''Parahippus leonensis'' – or unidentified comparable form
* 
†''Paramylodon''
** †''Paramylodon harlani''
* †''Paramys''
* †''Parandra''
* †''Paratylopus''
* †''Parectypodus''
** †''Parectypodus lunatus''
* †''Parictis''
* †''Parthenocissus''
* †''Passaloecus''
* †''Patriofelis''
* ''Pediacus''
* ''Pekania''
* †''Pellea''
* 
†''Peltosaurus''
** †''Peltosaurus granulosus'' – type locality for species
* †''Pelycodus''
** †''Pelycodus danielsae''
** †''Pelycodus jarrovii''
* ''Penthetria'' – type locality for genus
* †''Pepsis''
* †''Peraceras''
* †''Peratherium''
* ''Peromyscus''
** †''Peromyscus maniculatus''
* ''Persea''
* 
†''Petraeomyrmex'' – type locality for genus
** †''Petraeomyrmex minimus'' – type locality for species
* †''Phaca''
* ''Phalacrocorax''
* ''Phalaropus''
** †''Phalaropus lobatus''
* †''Phasmagyps'' – type locality for genus
* ''Pheidole''
* †''Phenacodus''
* ''Phenacomys''
** †''Phenacomys intermedius''
* ''Philadelphus''
* †''Philanthus''
* 
†''Phlaocyon''
* ''Phloeosinus''
* †''Phora''
* ''Phryganea''
* ''Phrynosoma''
** †''Phrynosoma douglassi''
* †''Phylledestes'' – type locality for genus
** †''Phylledestes vorax'' – type locality for species
* †''Phyllobaenus''
* ''Phyllobius''
* †''Phyllophaga''
* †''Phymatodes''
* ''Pica (genus), Pica''
** †''Pica hudsonia''
* ''Picea''
* ''Picoides''
** †''Picoides villosus''
* †''Pidonia''
* †''Pimpla''
* ''Pinus''
* †''Pipiza''
* †''Pison''
* ''Pituophis''
** †''Pituophis melanoleucus''
* ''Platanus''
* ''Plateumaris''
* †''Platycheirus''
* ''Platydema''
* 
†''Platygonus''
* ''Platynus''
* ''Platystethus''
* ''Plecia''
* †''Plesiadapis''
* †''Plesiobaena''
* †''Pliohippus''
* †''Plochionus''
* †''Poabromylus''
* ''Podabrus''
* ''Podiceps''
* ''Podilymbus''
** †''Podilymbus podiceps''
* 
†''Poebrotherium''
* †''Poecilocapsus''
* †''Poecilognathus'' – type locality for genus
* †''Pogonomyrmex''
** †''Pogonomyrmex fossilis'' – type locality for species
* †''Polysphincta''
* ''Populus''
* ''Porzana''
** †''Porzana carolina''
* †''Potamogeton''
* †''Praepapilio'' – type locality for genus
** †''Praepapilio colorado'' – type locality for species
** †''Praepapilio gracilis'' – type locality for species
* †''Priabona (genus), Priabona''
* †''Pristichampsus''
* †''Probathyopsis''
* †''Procas''
* 
†''Prodryas'' – type locality for genus
** †''Prodryas persephone'' – type locality for species
* †''Proiridomyrmex'' – type locality for genus
** †''Proiridomyrmex vetulus'' – type locality for species
* †''Prolimnocyon''
* †''Proscalops''
* ''Prosopis''
* †''Protazteca'' – type locality for genus
** †''Protazteca capitata'' – type locality for species
** †''Protazteca elongata'' – type locality for species
** †''Protazteca hendersoni'' – type locality for species
** †''Protazteca quadrata'' – type locality for species
* †''Protohippus''
* †''Protolabis''
* †''Protomarctus''
* 
†''Protorohippus''
* †''Protostephanus'' – type locality for genus
** †''Protostephanus ashmeadi'' – type locality for species
* †''Protungulatum''
** †''Protungulatum donnae''
* ''Prunus''
** †''Prunus gracilis''
* †''Psephenus''
* ''Pseudacris''
** †''Pseudacris triseriata''
* 
†''Pseudaelurus''
* †''Pseudhipparion''
* ''Pseudomyrmex''
* †''Pseudoprotoceras''
* †''Psittacotherium''
* ''Ptelea''
* ''Pterocarya''
* †''Pteromalus''
* ''Pterostichus''
* †''Ptilodus''
** †''Ptilodus kummae''
* †''Ptosima''
* ''Quedius''
* ''Quercus''
* ''Rallus''
** †''Rallus limicola''
* †''Ramoceros''
* †''Rana (genus), Rallus''
** †''Rallus limicola''
* 
†''Ramoceros''
* †''Rana (genus), Rana''
** †''Rana catesbeiana''
* †''Raphidia''
* ''Reithrodontomys''
* ''Reticulitermes''
* ''Rhabdomastix''
* †''Rhagio''
* ''Rhagonycha''
* †''Rhamnus (genus), Rhamnus''
* †''Rhamphomyia''
* 
''Rhineura''
* †''Rhingia''
* ''Rhizophagus (beetle), Rhizophagus''
* ''Rhus''
* †''Rhyssa''
* †''Ribes''
* †''Robinia''
* †''Rogas''
* ''Rose, Rosa''
* †''Rothschildia''
* ''Rubus''
* ''Sabal''
* †''Saccoloma''
* ''Salix''
* †''Sambucus''
* 
†''Saniwa''
* †''Saperda''
** †''Saperda florissantensis'' – type locality for species
* †''Sapindus''
* †''Sapromyza''
* ''Sassafras''
** †''Sassafras hesperia''
* ''Scaphinotus''
* ''Sceloporus''
** †''Sceloporus undulatus''
* ''Sciara (gnat), Sciara''
* †''Sciophila (fly), Sciophila''
* ''Sciurus''
* ''Scolytus''
* †''Segestria (spider), Segestria''
* †''Selaginella''
* †''Semanotus''
* ''Sequoia (genus), Sequoia''
** 
†''Sequoia affinis''
* ''Serica (genus), Serica''
* †''Sespia''
* †''Sialia''
* †''Sibinia''
* †''Sifrhippus''
* ''Sigmodon''
* †''Silpha''
* †''Silvius (insect), Silvius''
* †''Sinonyx'' – or unidentified comparable form
* ''Sitona''
* †''Sitones''
* ''Sitta''
** †''Sitta carolinensis''
* †''Smilax''
* 
†''Smilodectes''
** †''Smilodectes gracilis''
** †''Smilodectes mcgrewi''
* ''Sonoma''
* ''Sorex''
** †''Sorex arcticus''
** †''Sorex hoyi''
* †''Sparganium''
* ''Spea''
** †''Spea bombifrons''
* †''Spermophagus''
* ''Spermophilus''
** †''Spermophilus elegans'' – or unidentified comparable form
** †''Spermophilus lateralis''
** †''Spermophilus richardsonii''
** †''Spermophilus tridecemlineatus''
* †''Sphegina''
* 
†''Sphenocoelus''
* ''Spilogale''
** †''Spilogale putorius''
* ''Spizella''
** †''Spizella breweri''
* †''Staphylea''
* ''Staphylinus''
* †''Stenolophus''
* †''Stenosphenus''
* ''Stenus''
* ''Sterculia''
* ''Stilbus''
* †''Stipa''
* †''Strategus''
* †''Stylinodon''
* 
†''Subhyracodon''
* ''Sylvilagus''
** †''Sylvilagus audubonii''
* †''Symphoromyia''
* ''Syrphus''
* †''Systena''
* †''Tabanus''
* ''Tachycineta''
** †''Tachycineta bicolor''
* ''Tachyporus''
* †''Tachys''
* ''Tamiasciurus''
** †''Tamiasciurus hudsonicus''
** †''Tanysphyrus lemnae''
* ''Tapirus''
* ''Taxidea''
** †''Taxidea taxus''
* †''Teilhardina''
* 
†''Teleoceras''
* †''Tenor'' – type locality for genus
* †''Tenthredo''
* †''Tetragnatha''
* †''Tetraonyx''
* †''Tetraopes''
** †''Tetraopes submersus'' – type locality for species
* †''Tetrapus''
* ''Thamnophis''
** 
†''Thamnophis elegans''
** †''Thamnophis sirtalis''
* †''Thanasimus''
* †''Themira''
* †''Thomisus''
* ''Thomomys''
** †''Thomomys talpoides''
* †''Thouinia''
* †''Thuja''
* †''Ticholeptus''
* ''Tilia''
* †''Tingis''
* ''Tipula'' – type locality for genus
* †''Titanoeca''
* †''Titanoides''
** †''Titanoides looki''
** †''Titanoides primaevus''
* †''Tomarctus''
** †''Tomarctus brevirostris'' – type locality for species
* †''Tomoxia''
** †''Tomoxia inundata'' – type locality for species
* †''Torreya''
* †''Tortricites''
* †''Tortrix''
** †''Tortrix florissantana'' – type locality for species
* †''Torymus''
* ''Trechus''
* †''Trichilia''
* †''Triga (genus), Triga''
* †''Trigonias''
* †''Trigonoscuta''
* †''Triplax''
* †''Tritemnodon''
* †''Triumfetta''
* †''Trixoscelis''
* †''Trogosus''
* ''Trogoxylon''
* †''Trogus''
* †''Tropisternus''
* ''Trox''
* †''Trypherus''
* †''Tryphon (wasp), Tryphon''
* †''Tychius''
* ''Typha''
* †''Uintacyon''
* †''Uintascorpio'' – type locality for genus
* ''Ulmus''
* †''Ulus''
* ''Urocyon''
** 
†''Urocyon cinereoargenteus''
* †''Ursavus''
* ''Ursus (genus), Ursus''
** †''Ursus americanus''
* †''Ustatochoerus''
* †''Vanessa (butterfly), Vanessa''
* †''Vauquelinia''
* †''Viburnum''
* †''Vicia''
* †''Villa'' – type locality for genus
* ''Vitis''
* †''Viverravus''
* †''Vrilletta''
* 
†''Vulpavus''
* ''Vulpes''
** †''Vulpes velox''
** †''Vulpes vulpes''
* †''Weinmannia''
* †''Woodwardia''
* †''Xantholinus''
* †''Xestobium''
* †''Xylocopa''
* †''Xylomya''
* †''Xyronomys''
* †''Yumaceras''
* †''Zamia''
* ''Zelkova''
* ''Zizyphus''
* ''Zonotrichia''
** †''Zonotrichia leucophrys''
* †''Zootermopsis''
* 
†''Zygolophodon''
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 (genus), Caninia''
* †''Catenipora''
* †''Ceraurinus''
* †''Charactoceras'' – tentative report
* †''Chirognathus''
* †''Composita''
** †''Composita ovata''
* †''Conocardium''
* †''Cordaites''
* †''Cornulites''
* †''Crania (brachiopod), Crania''
* †''Ctenacanthus''
** †''Ctenacanthus buttersi''
** †''Ctenacanthus furcicarinatus''
* †''Cupressocrinites''
* †''Cutleria (animal), 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 (genus), Lingula''
* †''Meristella''
* †''Neospirifer''
** †''Neospirifer goreii''
* †''Neuropteris''
** †''Neuropteris auriculata''
** †''Neuropteris gigantea'' – tentative report
** †''Neuropteris heterophylla''
* †''Ophiacodon''
* †''Oradectes''
* †''Ormoceras''
* †''Orthoceras''
* †''Oulodus''
* †''Paladin (trilobite), Paladin'' – tentative report
* †''Pecopteris''
** †''Pecopteris arborescens''
* †''Plaesiomys''
* †''Platyceras''
* †''Platyhystrix''
** †''Platyhystrix rugosus''
* †''Pugnax''
* †''Receptaculites''
* †''Samaropsis''
* †''Sandia (brachiopod), 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 (genus), Amia''
* †''Amphicoelias'' – type locality for genus
** †''Amphicoelias altus'' – type locality for species
* †''Amphicotylus''
** †''Amphicotylus lucasii'' – type locality for species
* †''Anaklinoceras''
* †''Anisoceras''
* †''Anomia (genus), 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 (genus), 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 (genus), Crenella''
* †''Cretolamna''
** †''Cretolamna appendiculata''
* †''Cretoxyrhina''
** †''Cretoxyrhina mantelli''
* ''Cucullaea''
* ''Cuspidaria (bivalve), 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 (genus), Lingula''
* †''Lioestheria''
* †''Lisserpeton''
** †''Lisserpeton bairdi''
* †''Lonchidion''
* †''Genus, 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 (bivalve), 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 (bivalve), 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 (bivalve), 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 (sponge), 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''
* ''Acer (plant), Abies''
* †''Absyrtus''
* †''Acalles''
* ''Acer (plant), Acer''
* †''Acilius (genus), Acilius''
* ''Acris''
* †''Acrostichum''
* †''Adalia (beetle), Adalia''
* †''Adelopsyche'' – type locality for genus
* †''Adocus''
* ''Aegialia''
* †''Aelurodon''
* †''Aepycamelus''
** †''Aepycamelus giraffinus''
* †''Aeshna''
* ''Agabus''
* †''Agallia''
* †''Agathemera''
* ''Agelaius''
* †''Agnotocastor''
* ''Agrilus''
* ''Agriotes''
* †''Agromyza''
* †''Agulla (snakefly), Agulla''
** †''Agulla protomaculata'' – type locality for species
* †''Ailanthus''
* †''Aletodon''
* ''Aleurites''
* †''Alforjas'' – tentative report
* †''Allognathosuchus''
* †''Allophylus''
* ''Altica''
* †''Alysia''
* ''Amara (genus), Amara''
* †''Amauropilio''
* †''Amblycorypha'' – tentative report
* †''Amblyteles''
* †''Ambystoma''
** †''Ambystoma tigrinum''
* †''Amebelodon''
* ''Amelanchier''
* ''Amia (genus), Amia''
* †''Ammophila''
* †''Ampelopsis''
* †''Amphechinus''
* †''Amphicerus''
* †''Amphicyon''
** †''Amphicyon galushai''
** †''Amphicyon ingens''
* †''Amphimachairodus''
* †''Anabrus''
* ''Anas''
* †''Anasa''
* †''Anatis''
* †''Anchitherium''
* ''Andrena''
* †''Andrias''
* †''Andricus''
* †''Anelaphus''
* †''Anemia''
* †''Angustidens''
* ''Anisotoma''
* †''Anobium''
* †''Anomala''
* †''Anomalon''
* ''Anser (bird), Anser''
* †''Antas (genus), Antas''
* ''Anthaxia''
* †''Antherophagus''
* †''Anthidium''
** †''Anthidium exhumatum'' – type locality for species
** †''Anthidium scudderi'' – type locality for species
* †''Anthomyia''
* ''Anthonomus''
* †''Anthophora''
* ''Antilocapra''
** †''Antilocapra americana''
* †''Antocha''
* ''Aphaenogaster''
** †''Aphaenogaster donisthorpei'' – type locality for species
** †''Aphaenogaster mayri'' – type locality for species
* †''Aphelops''
* ''Aphodius''
* ''Aphrophora''
* ''Apion''
* †''Apolysis''
* ''Aquila (genus), Aquila''
** †''Aquila chysaetos''
* ''Araneus''
* †''Archaeotherium''
* †''Archimyrmex'' – type locality for genus
** †''Archimyrmex rostratus'' – type locality for species
* †''Archiponera'' – type locality for genus
** †''Archiponera wheeleri'' – type locality for species
* †''Arctocyon''
* †''Argia''
* †''Arhopalus''
* †''Aristolochia''
* †''Artocarpus''
* †''Asimina''
* ''Asio''
* †''Asplenium''
* †''Aster (genus), Aster''
* †''Astronium''
* ''Ataenius''
* †''Athalia''
* †''Athous''
* †''Athyana''
* †''Attagenus''
* †''Auraria (genus), Auraria'' – type locality for genus
* ''Aythya''
** †''Aythya affinis''
** †''Aythya americana''
* †''Aztlanolagus''
* †''Baena''
* †''Baris (genus), Baris''
* †''Barylambda''
* †''Braconid wasp, Bassus''
* †''Bathornis'' – type locality for genus
** †''Bathornis veredus'' – type locality for species
* †''Bathygenys''
* †''Bathyopsis''
* †''Belyta''
* ''Bembidion''
** †''Bembidion constricticolle''
* †''Bembidium''
* †''Beris''
* ''Betula''
* ''Bibio''
* †''Bibiodes''
* †''Bidessus''
* ''Bison''
** †''Bison antiquus'' – or unidentified comparable form
** †''Bison latifrons''
* †''Blechnum''
* ''Bledius''
* ''Boletina''
* †''Borealosuchus''
* †''Borophagus''
** †''Borophagus pugnator''
* †''Brachinus''
* †''Brachycrus''
* ''Brachylagus''
* †''Brachyprotoma''
** †''Brachyprotoma obtusata''
* †''Brachypsalis''
* †''Brachyrhynchocyon''
* †''Brachyspathus'' – type locality for genus
* ''Bracon''
* †''Bruchus''
* ''Horned owl, Bubo''
** †''Bubo virginianus''
* ''Bufo''
** †''Bufo cognatus''
** †''Bufo woodhousei''
* †''Buprestis''
* †''Bursera''
* ''Buteo''
* †''Caesalpinia''
* †''Calcarius''
** †''Calcarius lapponicus''
** †''Calcarius ornatus''
* †''Calippus (genus), Calippus''
* †''Caliroa''
* †''Callimoxys''
* †''Callomyia'' – tentative report
* ''Calosoma''
* †''Calyptapis'' – type locality for genus
** †''Calyptapis florissantensis'' – type locality for species
* †''Camelops''
** †''Camelops hesternus''
* ''Camponotus''
* ''Canis''
** †''Canis edwardii'' – or unidentified comparable form
** †''Canis latrans''
* †''Cantius''
** †''Cantius abditus''
** †''Cantius frugivorus''
** †''Cantius mckennai''
** †''Cantius ralstoni''
* †''Capnobotes''
* †''Capsus''
* ''Carabus''
* †''Cardiophorus''
* †''Cardiospermum''
* †''Carpocyon''
* ''Carpodacus''
** †''Carpodacus cassinii''
* †''Carpophilus''
* ''Carya''
* ''Castanea (plant), Castanea''
* †''Catopsalis''
** †''Catopsalis alexanderi'' – type locality for species
* †''Cecidomyia'' – tentative report
* ''Cedrela''
* †''Celastrus''
* ''Celtis''
* †''Centron (weevil), Centron'' – type locality for genus
* †''Ceratina''
* †''Ceratosuchus'' – type locality for genus
** †''Ceratosuchus burdoshi'' – type locality for species
* †''Ceraturgus''
* ''Cercidiphyllum''
* ''Cercis''
* †''Cercocarpus''
* †''Cercopis''
* ''Cervus''
** †''Cervus elaphus''
* ''Ceutorhynchus''
* ''Chaetodipus''
** †''Chaetodipus hispidus''
* †''Chalcis''
* †''Chalybion''
* †''Chamaecyparis''
* †''Chamaedorea''
* ''Charina''
* †''Chauliognathus''
* ''Cheilosia''
* †''Chelonus''
* †''Chilocorus''
* †''Chionaemopsis'' – type locality for genus
* ''Chironomus''
* ''Chondestes''
** †''Chondestes grammacus''
* †''Chriacus''
* †''Chrysis (wasp), Chrysis''
* †''Chrysobothris''
* †''Chrysogaster''
* ''Chrysomela''
* †''Cicada''
* †''Cicadella''
* †''Cimbex''
* †''Cimexomys''
** †''Cimexomys arapahoensis'' – type locality for species
** †''Cimexomys minor''
* ''Cinnamomum''
* ''Cissus''
* †''Cixius'' – tentative report
* †''Cladius (genus), Cladius''
* †''Cladura''
* †''Clastoptera''
* †''Cleonus''
* †''Closterocoris''
** †''Closterocoris elegans'' – type locality for species
* †''Clubiona''
* †''Clytus''
* †''Coccinella''
* †''Coeliodes''
* ''Colaptes''
** †''Colaptes auratus''
* †''Colaspis''
* †''Collops''
* †''Colopterus''
* †''Colubrina''
* †''Compsemys''
* †''Coniatus''
* ''Conotelus''
** †''Conotelus obscurus''
* †''Conotrachelus''
* †''Conzattia''
* †''Copecion''
* †''Copelemur''
* †''Copidita''
* ''Corixa''
* †''Corizus''
* †''Cormocyon''
* †''Cormohipparion''
* ''Cornus''
* ''Corticaria''
* ''Corvus''
** †''Corvus brachyrhynchos''
** †''Corvus corax''
* †''Corylus''
* †''Coryphodon''
* ''Cossonus''
* †''Cotinus''
* †''Crabro''
* †''Cratacanthus''
* ''Crataegus''
* ''Crotalus''
** †''Crotalus viridis''
* †''Croton''
* †''Cryptocephalus''
* †''Cryptocheilus''
* ''Cryptophagus''
* ''Cryptorhynchus''
* †''Cryptus''
* ''Culex''
* †''Curculio''
* †''Cuterebra''
* †''Cyclotrachelus''
* †''Cydamus''
* †''Cylindrotoma''
* †''Cynarctoides''
** †''Cynarctoides acridens''
* †''Cynelos''
* ''Cynomys''
* †''Cyphomyia''
* †''Cypris''
* †''Daphne (plant), Daphne''
* ''Daphnia''
* †''Daphoenus''
* †''Davidia''
* †''Denaeaspis'' – type locality for genus
** †''Denaeaspis chelonopsis'' – type locality for species
* †''Dennstaedtia''
* †''Dermatobia''
* †''Dermestes''
* †''Diabrotica''
* †''Diacodexis''
* †''Dialysis (fly), Dialysis''
* ''Diamesa''
* †''Dianthidium''
* †''Diceratherium''
* †''Dicerca''
* ''Dicranomyia''
* †''Dicranota''
* †''Dictyla''
* †''Didymictis''
* †''Didymosphaeria''
* †''Dilophodon''
* †''Dinictis''
* †''Dinohippus''
* †''Dioctria''
* ''Dioscorea''
* †''Diploptera''
* ''Diplotaxis'' – tentative report
* ''Diplotaxis''
* ''Dipodomys''
** †''Dipodomys ordii''
* ''Dipteronia''
* †''Dissacus''
* †''Docimus'' – type locality for genus
* ''Dodonaea''
* ''Dolichoderus''
** †''Dolichoderus antiquus'' – type locality for species
** †''Dolichoderus kohlsi'' – type locality for species
** †''Dolichoderus rohweri'' – type locality for species
* †''Dominickus'' – type locality for genus
** †''Dominickus castnioides'' – type locality for species
* †''Domnina (genus), Domnina''
* ''Donacia''
* ''Dorytomus''
* †''Doxocopa''
* †''Drassonax''
* †''Dromomeryx''
** †''Dromomeryx borealis'' – type locality for species
* †''Dryobius''
* ''Dryopteris''
* ''Dyschirius''
* †''Dysdercus''
* †''Echmatemys''
* †''Ectobius''
* †''Ectocion''
* †''Ectoconus''
* †''Elaeomyrmex'' – type locality for genus
** †''Elaeomyrmex coloradensis'' – type locality for species
** †''Elaeomyrmex gracilis'' – type locality for species
* †''Elaphidion''
* ''Elaphropus''
* †''Elater''
* ''Eleodes''
* †''Emiliana'' – type locality for genus
** †''Emiliana alexandri'' – type locality for species
* †''Empis''
* †''Enallagma''
* ''Engelhardtia''
* ''Enochrus''
* †''Entimus''
* †''Eobasileus''
** †''Eobasileus cornutus''
* †''Eocuculus'' – type locality for genus
* †''Eogryllus''
* †''Eohippus''
** †''Eohippus angustidens''
* †''Eosacantha'' – type locality for genus
** †''Eosacantha delocranioides'' – type locality for species
* †''Eotitanops''
* ''Ephedra (plant), Ephedra''
* †''Ephemera''
* †''Epicaerus''
* ''Epicauta''
* †''Epicyon''
** †''Epicyon haydeni''
* †''Epihippus''
* ''Epuraea''
* †''Epyris''
* †''Equisetum''
* ''Equus (genus), Equus''
** †''Equus conversidens''
** †''Equus francisci''
** †''Equus scotti'' – or unidentified comparable form
** †''Equus simplicidens''
* ''Eremophila (bird), Eremophila''
** †''Eremophila alpestris''
* ''Erethizon''
* ''Eriocampa''
* †''Eriophyes'' – tentative report
* †''Eristalis''
* †''Ernobius''
* †''Ethmia''
* †''Eubazus''
* †''Eucnemis''
* †''Eucommia''
* ''Eugenia''
* †''Eulithomyrmex'' – type locality for genus
** †''Eulithomyrmex rugosus'' – type locality for species
** †''Eulithomyrmex striatus'' – type locality for species
* †''Euparius''
* ''Euphorbia''
* †''Eurytoma''
* ''Eutamias''
** †''Eutamias minimus'' – or unidentified comparable form
* †''Exochus''
* ''Fagus (plant), Fagus''
* ''Falcipennis''
* ''Falco (genus), Falco''
** †''Falco sparverius''
* ''Ficus''
* †''Florissantia (plant), Florissantia'' – type locality for genus
** †''Florissantoraphidia funerata'' – type locality for species
* ''Formica''
* †''Fornax''
* †''Fraxinus''
* †''Fulgora''
* †''Coot, Fulica''
** †''Fulica americana''
* †''Gaurotes''
* †''Geocoris''
* ''Geomys''
** †''Geomys bursarius''
* †''Geron (insect), Geron'' – tentative report
* ''Gerris''
* †''Gigantocamelus''
* †''Glossina'' – type locality for genus
* ''Glyptostrobus''
* ''Gnophomyia''
* †''Gomphocerus''
* †''Gomphotherium''
* †''Gorytes''
* †''Grammoptera''
* †''Gyaclavator'' – type locality for genus
** †''Gyaclavator kohlsi'' – type locality for species
* †''Gymnopternus''
* †''Gymnorhinus''
* †''Hadrianus (genus), Hadrianus''
* ''Halesia''
* †''Hapalodectes''
* †''Haplolambda''
* ''Harpalus''
* †''Helaletes''
* †''Helichus''
* †''Hellwigia''
* ''Helophorus''
* †''Hemiauchenia''
** †''Hemiauchenia macrocephala''
* †''Heptodon''
* †''Heriades''
* †''Herpetotherium''
** †''Herpetotherium fugax''
** †''Herpetotherium knighti''
* ''Hersiliola''
* †''Hesperocyon''
* ''Heterodon''
** †''Heterodon nasicus''
* †''Hexerites'' – type locality for genus
** †''Hexerites primalis'' – type locality for species
* †''Heyderia''
* ''Holbrookia''
** †''Holbrookia maculata''
* †''Holcorpa'' – type locality for genus
** †''Holcorpa maculosa'' – type locality for species
* †''Homogalax''
* †''Hoplia''
* †''Hoplocampa''
* †''Hoplochelys''
* †''Humulus''
* †''Hyaenodon''
** †''Hyaenodon crucians''
** †''Hyaenodon horridus''
** †''Hyaenodon mustelinus''
* †''Hydnobius''
* ''Hydrangea''
* ''Hydriomena''
* †''Hydriomena? protrita'' – tentative report
* ''Hydrobius''
** †''Hydrobius fuscipes''
* †''Hydromystria''
* ''Hydrophilus (insect), Hydrophilus''
* ''Hydroporus''
* ''Hydropsyche''
* †''Hydroptila''
* ''Hygrotus''
* †''Hylobius''
* †''Hymenophyllum''
* †''Hyopsodus''
* †''Hypertragulus''
* †''Hypisodus''
* †''Hypohippus''
* †''Hypolagus''
* †''Hyporhina''
** †''Hyporhina galbreathi'' – type locality for species
* †''Hyrachyus''
* †''Hyracodon''
* †''Hyracotherium''
** †''Hyracotherium vasacciense''
* †''Ichneumon (genus), Ichneumon''
* ''Ilex''
* †''Indusia''
* †''Iridomyrmex''
** †''Iridomyrmex florissantius'' – type locality for species
** †''Iridomyrmex obscurans'' – type locality for species
* †''Ischyromys''
* †''Isomira''
* †''Isothea'' – type locality for genus
* †''Isotrilophus''
* †''Iulus''
* †''Jadera''
* †''Janus (genus), Janus''
* ''Jassus'' – tentative report. ''Lapsus calami'' of ''Iassus (leafhopper), Iassus''.
* †''Judolia''
** †''Judolia antecurrens'' – type locality for species
* ''Juglans''
* ''Junco''
** †''Junco hyemalis''
* †''Juncus''
* †''Kalmia''
* †''Kimbetohia''
* ''Koelreuteria''
* †''Lacon (beetle), Lacon''
* †''Lagopus''
** †''Lagopus leucurus''
* †''Lambdotherium''
* †''Lapton (biology), Lapton''
* ''Larus''
* ''Lasiopodomys''
* ''Lasius''
* ''Lathrobium''
* ''Laurus''
* †''Lebia''
* †''Leia''
* †''Lema (genus), Lema''
* ''Lemmiscus''
** †''Lemmiscus curtatus''
* ''Lepisosteus''
* †''Leptauchenia''
* †''Leptis''
* †''Leptocyon''
* †''Leptomeryx''
* †''Leptomorphus''
* ''Leptophloeus''
* †''Leptostylus''
* †''Leptura''
* ''Lepus''
** †''Lepus townsendii''
* †''Leucosticte''
** †''Leucosticte atrata''
** †''Leucosticte tephrocotis''
* †''Leucozona''
* †''Ligyrocoris''
* †''Ligyrus''
* †''Limnephilus''
* †''Limnobium''
* †''Limnophila (fly), Limnophila''
* †''Limonius''
* ''Lindera''
* †''Linnaea'' – type locality for genus
* †''Linyphia''
* †''Liometopum''
** †''Liometopum miocenicum'' – type locality for species
** †''Liometopum scudderi'' – type locality for species
* †''Lithocharis''
* †''Lithodryas'' – type locality for genus
** †''Lithodryas styx'' – type locality for species
* †''Locusta''
* ''Lomatia''
* ''Longitarsus''
* ''Lontra''
** †''Lontra canadensis'' – or unidentified comparable form
* †''Lucanus (genus), Lucanus''
* †''Lycosa''
* †''Lygaeus''
* ''Lygodium''
* ''Lynx''
** †''Lynx rufus''
* ''Lytta''
* ''Macrocranion''
* †''Macrodactylus''
* †''Macrophya''
* †''Macrorhoptus''
* ''Magdalis''
* ''Magnolia''
* ''Mahonia''
* †''Maiorana (genus), Maiorana''
* †''Malachius''
* †''Malus''
* †''Mammuthus''
** †''Mammuthus columbi''
* ''Marmota''
** †''Marmota flaviventris''
* ''Martes''
* †''Megacerops''
* ''Megachile''
* †''Megacyllene''
* †''Megahippus''
* †''Megalictis''
* †''Megapenthes''
* †''Megatylopus''
* †''Melanactes''
* †''Melanophila''
* †''Melieria''
* †''Melittomma''
* †''Mellinus''
* ''Melospiza''
** †''Melospiza lincolnii''
* †''Meniscotherium''
* †''Menoceras''
* ''Mephitis (genus), Mephitis''
** †''Mephitis mephitis''
* †''Merychippus''
** †''Merychippus sejunctus''
* †''Merychyus''
* †''Merycochoerus''
* †''Merycodus''
* †''Merycoidodon'' – type locality for genus
* †''Mesatirhinus''
* †''Mesochorus''
* †''Mesocyon''
* †''Mesodma''
** †''Mesodma hensleighi''
* †''Mesohippus''
* †''Mesoleptus''
* †''Mesonyx''
** †''Mesonyx obtusidens''
* †''Mesostenus''
* ''Messor''
* †''Metacheiromys''
* ''Metachroma''
* †''Metarhinus''
* ''Metasequoia''
** †''Metasequoia occidentalis''
* †''Miacis''
* ''Miagrammopes''
* †''Michenia''
* †''Microplitis''
* †''Microsyops''
* †''Microtomarctus''
* ''Microtus''
** †''Microtus californicus'' – or unidentified comparable form
** †''Microtus longicaudus''
** †''Microtus ochrogaster''
* †''Mimoperadectes''
* †''Mindarus'' – type locality for genus
* †''Miniochoerus''
* †''Miodytiscus'' – type locality for genus
* †''Miohippus''
* †''Miomyrmex''
** †''Miomyrmex impactus'' – type locality for species
** †''Miomyrmex striatus'' – type locality for species
* †''Miracinonyx''
** †''Miracinonyx inexpectatus'' – or unidentified comparable form
** †''Miracinonyx studeri''
* †''Monosaulax''
* ''Mordella''
** †''Mordella atrata'' – or unidentified comparable form
** †''Mordella lapidicola'' – type locality for species
** †''Mordella priscula'' – type locality for species
** †''Mordella stygia'' – type locality for species
* ''Mordellistena''
** †''Mordellistena florissantensis'' – type locality for species
** †''Mordellistena nearctica'' – type locality for species
** †''Mordellistena scudderiana'' – type locality for species
** †''Mordellistena smithiana'' – type locality for species
* †''Moropus''
* ''Morus''
* ''Musca''
* ''Mustela''
** †''Mustela richardsonii''
** †''Mustela nigripes''
* †''Myas''
* †''Mycetophagus''
* ''Mycetoporus''
* ''Myrica''
* ''Myrmica''
* ''Nebria''
* †''Nemognatha''
* †''Neoliotomus''
** †''Neoliotomus conventus''
** †''Neoliotomus ultimus''
* ''Neogale''
** ''Neogale frenata''
** ''Neogale vison''
* ''Neotoma''
** †''Neotoma cinerea''
* †''Nepa (insect), Nepa''
* †''Nephila''
* †''Netelia''
* †''Nicocles (fly), Nicocles''
* †''Notharctus''
** †''Notharctus robustior''
* ''Notonecta''
* ''Numenius (bird), Numenius''
** †''Numenius madagascariensis''
* †''Numitor'' – type locality for genus
* †''Nyctea''
** †''Nyctea scandiaca''
* ''Nymphaea''
* ''Nysius''
* †''Nyssa (plant), Nyssa''
* ''Ochotona''
** †''Ochotona princeps''
* †''Odaxosaurus'' – or unidentified comparable form
** †''Odaxosaurus piger''
* ''Odocoileus''
** †''Odocoileus hemionus''
* †''Odynerus''
* †''Oedipoda''
* †''Ogygoptynx'' – type locality for genus
* †''Oligoaeschna'' – type locality for genus
* †''Oligomerus''
* †''Oligotricha''
* ''Omalium''
* ''Omus''
* ''Ondatra''
* †''Oodectes''
* ''Ophisaurus''
* ''Ophryastes''
* †''Ophyra''
* †''Opisthotriton''
* †''Orchelimum''
* ''Orchestes''
* ''Oreamnos'' – or unidentified comparable form
** †''Oreamnos harringtoni''
* †''Oreopanax''
* †''Orohippus''
* †''Orontium''
* †''Orphilus''
* †''Orthocentrus''
* †''Osmanthus''
* †''Osmunda''
** †''Osmunda greenlandica''
* †''Otiorhynchus''
* ''Ovis''
** †''Ovis canadensis''
* †''Oxyacodon''
* †''Oxyaena''
* †''Oxycera''
* †''Oxyomus''
* †''Pachyaena''
* †''Paederus''
* †''Palaeogale''
* †''Palaeolagus''
* †''Palaeonictis''
* †''Palaeosinopa''
** †''Palaeospiza bella''
* †''Palaeosyops'' – type locality for genus
* †''Palaeovespa'' – type locality for genus
** †''Palaeovespa florissantia'' – type locality for species
** †''Palaeovespa gillettei'' – type locality for species
** †''Palaeovespa relecta'' – type locality for species
** †''Palaeovespa scudderi'' – type locality for species
** †''Palaeovespa wilsoni'' – type locality for species
* †''Palatobaena''
* †''Panax''
* †''Panorpa''
* †''Paracynarctus''
* †''Parahippus''
** †''Parahippus leonensis'' – or unidentified comparable form
* †''Paramylodon''
** †''Paramylodon harlani''
* †''Paramys''
* †''Parandra''
* †''Paratylopus''
* †''Parectypodus''
** †''Parectypodus lunatus''
* †''Parictis''
* †''Parthenocissus''
* †''Passaloecus''
* †''Patriofelis''
* ''Pediacus''
* ''Pekania''
* †''Pellea''
* †''Peltosaurus''
** †''Peltosaurus granulosus'' – type locality for species
* †''Pelycodus''
** †''Pelycodus danielsae''
** †''Pelycodus jarrovii''
* ''Penthetria'' – type locality for genus
* †''Pepsis''
* †''Peraceras''
* †''Peratherium''
* ''Peromyscus''
** †''Peromyscus maniculatus''
* ''Persea''
* †''Petraeomyrmex'' – type locality for genus
** †''Petraeomyrmex minimus'' – type locality for species
* †''Phaca''
* ''Phalacrocorax''
* ''Phalaropus''
** †''Phalaropus lobatus''
* †''Phasmagyps'' – type locality for genus
* ''Pheidole''
* †''Phenacodus''
* ''Phenacomys''
** †''Phenacomys intermedius''
* ''Philadelphus''
* †''Philanthus''
* †''Phlaocyon''
* ''Phloeosinus''
* †''Phora''
* ''Phryganea''
* ''Phrynosoma''
** †''Phrynosoma douglassi''
* †''Phylledestes'' – type locality for genus
** †''Phylledestes vorax'' – type locality for species
* †''Phyllobaenus''
* ''Phyllobius''
* †''Phyllophaga''
* †''Phymatodes''
* ''Pica (genus), Pica''
** †''Pica hudsonia''
* ''Picea''
* ''Picoides''
** †''Picoides villosus''
* †''Pidonia''
* †''Pimpla''
* ''Pinus''
* †''Pipiza''
* †''Pison''
* ''Pituophis''
** †''Pituophis melanoleucus''
* ''Platanus''
* ''Plateumaris''
* †''Platycheirus''
* ''Platydema''
* †''Platygonus''
* ''Platynus''
* ''Platystethus''
* ''Plecia''
* †''Plesiadapis''
* †''Plesiobaena''
* †''Pliohippus''
* †''Plochionus''
* †''Poabromylus''
* ''Podabrus''
* ''Podiceps''
* ''Podilymbus''
** †''Podilymbus podiceps''
* †''Poebrotherium''
* †''Poecilocapsus''
* †''Poecilognathus'' – type locality for genus
* †''Pogonomyrmex''
** †''Pogonomyrmex fossilis'' – type locality for species
* †''Polysphincta''
* ''Populus''
* ''Porzana''
** †''Porzana carolina''
* †''Potamogeton''
* †''Praepapilio'' – type locality for genus
** †''Praepapilio colorado'' – type locality for species
** †''Praepapilio gracilis'' – type locality for species
* †''Priabona (genus), Priabona''
* †''Pristichampsus''
* †''Probathyopsis''
* †''Procas''
* †''Prodryas'' – type locality for genus
** †''Prodryas persephone'' – type locality for species
* †''Proiridomyrmex'' – type locality for genus
** †''Proiridomyrmex vetulus'' – type locality for species
* †''Prolimnocyon''
* †''Proscalops''
* ''Prosopis''
* †''Protazteca'' – type locality for genus
** †''Protazteca capitata'' – type locality for species
** †''Protazteca elongata'' – type locality for species
** †''Protazteca hendersoni'' – type locality for species
** †''Protazteca quadrata'' – type locality for species
* †''Protohippus''
* †''Protolabis''
* †''Protomarctus''
* †''Protorohippus''
* †''Protostephanus'' – type locality for genus
** †''Protostephanus ashmeadi'' – type locality for species
* †''Protungulatum''
** †''Protungulatum donnae''
* ''Prunus''
** †''Prunus gracilis''
* †''Psephenus''
* ''Pseudacris''
** †''Pseudacris triseriata''
* †''Pseudaelurus''
* †''Pseudhipparion''
* ''Pseudomyrmex''
* †''Pseudoprotoceras''
* †''Psittacotherium''
* ''Ptelea''
* ''Pterocarya''
* †''Pteromalus''
* ''Pterostichus''
* †''Ptilodus''
** †''Ptilodus kummae''
* †''Ptosima''
* ''Quedius''
* ''Quercus''
* ''Rallus''
** †''Rallus limicola''
* †''Ramoceros''
* †''Rana (genus), Rallus''
** †''Rallus limicola''
* †''Ramoceros''
* †''Rana (genus), Rana''
** †''Rana catesbeiana''
* †''Raphidia''
* ''Reithrodontomys''
* ''Reticulitermes''
* ''Rhabdomastix''
* †''Rhagio''
* ''Rhagonycha''
* †''Rhamnus (genus), Rhamnus''
* †''Rhamphomyia''
* ''Rhineura''
* †''Rhingia''
* ''Rhizophagus (beetle), Rhizophagus''
* ''Rhus''
* †''Rhyssa''
* †''Ribes''
* †''Robinia''
* †''Rogas''
* ''Rose, Rosa''
* †''Rothschildia''
* ''Rubus''
* ''Sabal''
* †''Saccoloma''
* ''Salix''
* †''Sambucus''
* †''Saniwa''
* †''Saperda''
** †''Saperda florissantensis'' – type locality for species
* †''Sapindus''
* †''Sapromyza''
* ''Sassafras''
** †''Sassafras hesperia''
* ''Scaphinotus''
* ''Sceloporus''
** †''Sceloporus undulatus''
* ''Sciara (gnat), Sciara''
* †''Sciophila (fly), Sciophila''
* ''Sciurus''
* ''Scolytus''
* †''Segestria (spider), Segestria''
* †''Selaginella''
* †''Semanotus''
* ''Sequoia (genus), Sequoia''
** †''Sequoia affinis''
* ''Serica (genus), Serica''
* †''Sespia''
* †''Sialia''
* †''Sibinia''
* †''Sifrhippus''
* ''Sigmodon''
* †''Silpha''
* †''Silvius (insect), Silvius''
* †''Sinonyx'' – or unidentified comparable form
* ''Sitona''
* †''Sitones''
* ''Sitta''
** †''Sitta carolinensis''
* †''Smilax''
* †''Smilodectes''
** †''Smilodectes gracilis''
** †''Smilodectes mcgrewi''
* ''Sonoma''
* ''Sorex''
** †''Sorex arcticus''
** †''Sorex hoyi''
* †''Sparganium''
* ''Spea''
** †''Spea bombifrons''
* †''Spermophagus''
* ''Spermophilus''
** †''Spermophilus elegans'' – or unidentified comparable form
** †''Spermophilus lateralis''
** †''Spermophilus richardsonii''
** †''Spermophilus tridecemlineatus''
* †''Sphegina''
* †''Sphenocoelus''
* ''Spilogale''
** †''Spilogale putorius''
* ''Spizella''
** †''Spizella breweri''
* †''Staphylea''
* ''Staphylinus''
* †''Stenolophus''
* †''Stenosphenus''
* ''Stenus''
* ''Sterculia''
* ''Stilbus''
* †''Stipa''
* †''Strategus''
* †''Stylinodon''
* †''Subhyracodon''
* ''Sylvilagus''
** †''Sylvilagus audubonii''
* †''Symphoromyia''
* ''Syrphus''
* †''Systena''
* †''Tabanus''
* ''Tachycineta''
** †''Tachycineta bicolor''
* ''Tachyporus''
* †''Tachys''
* ''Tamiasciurus''
** †''Tamiasciurus hudsonicus''
** †''Tanysphyrus lemnae''
* ''Tapirus''
* ''Taxidea''
** †''Taxidea taxus''
* †''Teilhardina''
* †''Teleoceras''
* †''Tenor'' – type locality for genus
* †''Tenthredo''
* †''Tetragnatha''
* †''Tetraonyx''
* †''Tetraopes''
** †''Tetraopes submersus'' – type locality for species
* †''Tetrapus''
* ''Thamnophis''
** †''Thamnophis elegans''
** †''Thamnophis sirtalis''
* †''Thanasimus''
* †''Themira''
* †''Thomisus''
* ''Thomomys''
** †''Thomomys talpoides''
* †''Thouinia''
* †''Thuja''
* †''Ticholeptus''
* ''Tilia''
* †''Tingis''
* ''Tipula'' – type locality for genus
* †''Titanoeca''
* †''Titanoides''
** †''Titanoides looki''
** †''Titanoides primaevus''
* †''Tomarctus''
** †''Tomarctus brevirostris'' – type locality for species
* †''Tomoxia''
** †''Tomoxia inundata'' – type locality for species
* †''Torreya''
* †''Tortricites''
* †''Tortrix''
** †''Tortrix florissantana'' – type locality for species
* †''Torymus''
* ''Trechus''
* †''Trichilia''
* †''Triga (genus), Triga''
* †''Trigonias''
* †''Trigonoscuta''
* †''Triplax''
* †''Tritemnodon''
* †''Triumfetta''
* †''Trixoscelis''
* †''Trogosus''
* ''Trogoxylon''
* †''Trogus''
* †''Tropisternus''
* ''Trox''
* †''Trypherus''
* †''Tryphon (wasp), Tryphon''
* †''Tychius''
* ''Typha''
* †''Uintacyon''
* †''Uintascorpio'' – type locality for genus
* ''Ulmus''
* †''Ulus''
* ''Urocyon''
** †''Urocyon cinereoargenteus''
* †''Ursavus''
* ''Ursus (genus), Ursus''
** †''Ursus americanus''
* †''Ustatochoerus''
* †''Vanessa (butterfly), Vanessa''
* †''Vauquelinia''
* †''Viburnum''
* †''Vicia''
* †''Villa'' – type locality for genus
* ''Vitis''
* †''Viverravus''
* †''Vrilletta''
* †''Vulpavus''
* ''Vulpes''
** †''Vulpes velox''
** †''Vulpes vulpes''
* †''Weinmannia''
* †''Woodwardia''
* †''Xantholinus''
* †''Xestobium''
* †''Xylocopa''
* †''Xylomya''
* †''Xyronomys''
* †''Yumaceras''
* †''Zamia''
* ''Zelkova''
* ''Zizyphus''
* ''Zonotrichia''
** †''Zonotrichia leucophrys''
* †''Zootermopsis''
* †''Zygolophodon''
References
* {{Lists of the prehistoric life of the United States Paleontology in Colorado, * Lists of prehistoric life in the United States, Colorado Colorado-related lists