# List of the prehistoric life of Colorado

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
* Life restoration of the Middle-Late Ordovician jawless fish Astraspis †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
* Fossil of the Ordovician-Silurian tabulate coral Catenipora †Catenipora
* †Ceraurinus
* †Charactoceras – tentative report
* †Chirognathus
* †Composita
** †Composita ovata
* †Conocardium
* †Cordaites
* †Cornulites
* †Crania
* †Ctenacanthus
** †Ctenacanthus buttersi
** †Ctenacanthus furcicarinatus
* †Cupressocrinites
* Restoration of the Permian synapsid (mammal precursor) Cutleria †Cutleria – type locality for genus
** †Cutleria wilmarthi – type locality for species
* †Cyclopteris
* †Cyrtogomphoceras
* †Cyrtospirifer
** †Cyrtospirifer animasensis
** †Cyrtospirifer whitneyi
* †Echinosphaerites – tentative report
* †Edestus
* †Endoceras
* †Eretmocrinus
* Life restoration of the Carboniferous-Permian amphibian Eryops †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
* Restoration of the Carboniferous-Permian synapsid (mammal precursor) Ophiacodon †Ophiacodon
* †Oradectes
* †Ormoceras
* †Orthoceras
* †Oulodus
* †Paladin – tentative report
* †Pecopteris
** †Pecopteris arborescens
* †Plaesiomys
* †Platyceras
* Life restoration of the Carboniferous-Permian sail-backed amphibian Platyhystrix †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
* Fossil of the Silurian-Carboniferous crinoid ("sea lily") Taxocrinus (right) †Taxocrinus
* †Walchia
* †Westonoceras

## Mesozoic
### Selected Mesozoic taxa of Colorado

* Acmaea
* †Adocus
* †Albanerpeton
** †Albanerpeton nexuosus
* †Albertosaurus – tentative report
* Life restoration of the Late Jurassic theropod dinosaur Allosaurus †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
* Comparison of A. ajax (orange) and A. louisae (red) with a human (blue) and Brontosaurus parvus (green) †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
* Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites †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
* Fossilized skeleton of the Cretaceous turtle Basilemys †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
* Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus †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
* Restoration of the Late Jurassic ceratosaur Ceratosaurus †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
* Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys †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
* Diagram illustrating the Late Jurassic sauropod dinosaurs Diplodocus carnegii (green) and D. hallorum (orange) with an anachronistic human to scale. †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
* Skeletal reconstruction and restored soft tissue of the Late Cretaceous duck-billed dinosaur Edmontosaurus regalis with an anachronistic human to scale †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
* Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia †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
* Restoration of the Late Jurassic-Early Cretaceous crocodile relative Goniopholis †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
* Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size †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
* Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes †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
* Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus †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
* Fossilized skeleton of the Late Jurassic armored dinosaur Mymoorapelta †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
* Restoration of several species of the Late Cretaceous ammonoid cephalopod Nostoceras †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
* Fossilized skull of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus †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
* Fossilized shell of the Cretaceous marine bivalve Platyceramus †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
* Fossilized skull of the Late Cretaceous mosasaur Prognathodon †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
* Fossilized shell of the Late Cretaceous ammonoid cephalopod Scaphites †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
* Restoration of the Late Jurassic stegosaur Stegosaurus †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
* Fossilized skulls of the Late Cretaceous horned dinosaurs Torosaurus (A) and Triceratops (B) to scale †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
* Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus †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

* A living Abies, or fir tree Abies
* †Absyrtus
* †Acalles
* Abies
* †Absyrtus
* †Acalles
* Acer
* †Acilius
* Acris
* †Acrostichum
* †Adalia
* †Adelopsyche – type locality for genus
* †Adocus
* Aegialia
* †Aelurodon
* Life restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920). †Aepycamelus
** †Aepycamelus giraffinus
* †Aeshna
* Agabus
* †Agallia
* †Agathemera
* Agelaius
* †Agnotocastor
* Agrilus
* Agriotes
* †Agromyza
* †Agulla
** †Agulla protomaculata – type locality for species
* Foliage and fruits of an Ailanthus tree †Ailanthus
* †Aletodon
* Aleurites
* †Alforjas – tentative report
* †Allognathosuchus
* †Allophylus
* Altica
* †Alysia
* Amara
* †Amauropilio
* †Amblycorypha – tentative report
* †Amblyteles
* †Ambystoma
** †Ambystoma tigrinum
* Life restoration of the Miocene elephant relative Amebelodon. Margret Flinsch (1932). †Amebelodon
* Amelanchier
* Amia
* †Ammophila
* †Ampelopsis
* †Amphechinus
* †Amphicerus
* †Amphicyon
** †Amphicyon galushai
** †Amphicyon ingens
* Fossilized skull of the Miocene saber-toothed cat Amphimachairodus †Amphimachairodus
* †Anabrus
* Anas
* †Anasa
* †Anatis
* †Anchitherium
* Andrena
* †Andrias
* †Andricus
* †Anelaphus
* †Anemia
* †Angustidens
* Anisotoma
* †Anobium
* †Anomala
* †Anomalon
* Anser
* †Antas
* Anthaxia
* †Antherophagus
* A living Anthidium, or carder bee †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
** †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
* Life restoration of the Paleocene mammal Arctocyon †Arctocyon
* †Argia
* †Arhopalus
* †Aristolochia
* †Artocarpus
* †Asimina
* Asio
* †Asplenium
* †Aster
* †Astronium
* Ataenius
* †Athalia
* A living Athous click beetle †Athous
* †Athyana
* †Attagenus
* †Auraria – type locality for genus
* Aythya
** †Aythya affinis
** †Aythya americana
* †Aztlanolagus
* †Baena
* †Baris
* Life restoration of the Paleocene-Eocene pantodont mammal Barylambda †Barylambda
* †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
** Mounted fossilized skeleton of the Pleistocene Bison latifrons, or long-horned bison †Bison latifrons
* †Blechnum
* Bledius
* Boletina
* †Borealosuchus
* †Borophagus
** †Borophagus pugnator
* †Brachinus
* †Brachycrus
* Brachylagus
* †Brachyprotoma
** †Brachyprotoma obtusata
* †Brachypsalis
* Skeletal reconstruction of the Eocene-Oligocene bear-dog Brachyrhynchocyon †Brachyrhynchocyon
* †Brachyspathus – type locality for genus
* Bracon
* †Bruchus
* Bubo
** †Bubo virginianus
* Bufo
** †Bufo cognatus
** †Bufo woodhousei
* †Buprestis
* †Bursera
* A living Buteo hawk Buteo
* †Caesalpinia
* †Calcarius
** †Calcarius lapponicus
** †Calcarius ornatus
* †Calippus
* †Caliroa
* †Callimoxys
* †Callomyia – tentative report
* Calosoma
* †Calyptapis – type locality for genus
** †Calyptapis florissantensis – type locality for species
* Life restoration of the Pliocene-Holocene camel Camelops †Camelops
** †Camelops hesternus
* Camponotus
* Canis
** †Canis edwardii – or unidentified comparable form
** †Canis latrans
* †Cantius
** †Cantius abditus
** †Cantius frugivorus
** †Cantius mckennai
** †Cantius ralstoni
* †Capnobotes
* †Capsus
* A living Carabus ground beetle Carabus
* †Cardiophorus
* †Cardiospermum
* †Carpocyon
* Carpodacus
** †Carpodacus cassinii
* †Carpophilus
* Carya
* Castanea
* †Catopsalis
** †Catopsalis alexanderi – type locality for species
* †Cecidomyia – tentative report
* Cedrela
* †Celastrus
* Celtis
* †Centron – type locality for genus
* †Ceratina
* Life restoration of the Paleocene-Eocene crocodilian Ceratosuchus †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
* A stand of living Chamaedorea palms †Chamaedorea
* Charina
* †Chauliognathus
* Cheilosia
* †Chelonus
* †Chilocorus
* †Chionaemopsis – type locality for genus
* Chironomus
* Chondestes
** †Chondestes grammacus
* †Chriacus
* †Chrysis
* †Chrysobothris
* †Chrysogaster
* Chrysomela
* †Cicada
* †Cicadella
* †Cimbex
* †Cimexomys
** †Cimexomys arapahoensis – type locality for species
** †Cimexomys minor
* A living Cinnamomum, or cinnamon tree Cinnamomum
* Cissus
* †Cixius – tentative report
* †Cladius
* †Cladura
* †Clastoptera
* †Cleonus
* †Closterocoris
** †Closterocoris elegans – type locality for species
* †Clubiona
* †Clytus
* †Coccinella
* †Coeliodes
* Colaptes
** A living Colaptes auratus, or northern flicker †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
* Life restoration of the Paleocene-Eocene pantodont mammal Coryphodon. Heinrich Harder (1920). †Coryphodon
* Cossonus
* †Cotinus
* †Crabro
* †Cratacanthus
* Crataegus
* Crotalus
** †Crotalus viridis
* †Croton
* †Cryptocephalus
* †Cryptocheilus
* Cryptophagus
* Cryptorhynchus
* †Cryptus
* A living Culex mosquito Culex
* †Curculio
* †Cuterebra
* †Cyclotrachelus
* †Cydamus
* †Cylindrotoma
* †Cynarctoides
** †Cynarctoides acridens
* †Cynelos
* Cynomys
* †Cyphomyia
* †Cypris
* †Daphne
* Daphnia
* Life restoration of the Eocene-Miocene bear dog Daphoenus †Daphoenus
* †Davidia
* †Denaeaspis – type locality for genus
** †Denaeaspis chelonopsis – type locality for species
* †Dennstaedtia
* †Dermatobia
* †Dermestes
* †Diabrotica
* †Diacodexis
* †Dialysis
* Diamesa
* †Dianthidium
* †Diceratherium
* †Dicerca
* Dicranomyia
* †Dicranota
* †Dictyla
* †Didymictis
* †Didymosphaeria
* †Dilophodon
* Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis. Robert Bruce Horsfall (1913). †Dinictis
* †Dinohippus
* †Dioctria
* Dioscorea
* †Diploptera
* Diplotaxis – tentative report
* Diplotaxis
* Dipodomys
** †Dipodomys ordii
* Dipteronia
* †Dissacus
* †Docimus – type locality for genus
* Dodonaea
* Preserved Dolichoderus ant 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
* Donacia
* Dorytomus
* †Doxocopa
* †Drassonax
* Fossilized horns, jaws, and limb bones of the Miocene deer relative Dromomeryx †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
* Life restoration of a pair of the Eocene uintathere mammal Eobasileus. Charles R. Knight (1890s). †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
* †Ephemera
* †Epicaerus
* Epicauta
* †Epicyon
** †Epicyon haydeni
* †Epihippus
* Epuraea
* †Epyris
* †Equisetum
* Equus
** †Equus conversidens
** †Equus francisci
** Restoration of the Pliocene-Holocene horse Equus scotti, or Scott's horse †Equus scotti – or unidentified comparable form
** †Equus simplicidens
* Eremophila
** †Eremophila alpestris
* Erethizon
* Eriocampa
* †Eriophyes – tentative report
* †Eristalis
* †Ernobius
* †Ethmia
* †Eubazus
* †Eucnemis
* †Eucommia
* Eugenia
* Fossil of the Eocene ant Eulithomyrmex †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
* Falcipennis
* Falco
** †Falco sparverius
* Ficus
* Fossilized flower of the Eocene-Oligocene mallow relative Florissantia †Florissantia – type locality for genus
** †Florissantoraphidia funerata – type locality for species
* Formica
* †Fornax
* †Fraxinus
* †Fulgora
* †Fulica
** †Fulica americana
* †Gaurotes
* †Geocoris
* Geomys
** †Geomys bursarius
* †Geron – tentative report
* Gerris
* †Gigantocamelus
* †Glossina – type locality for genus
* Glyptostrobus
* Gnophomyia
* †Gomphocerus
* Mounted fossilized skeleton of the Miocene-Pleistocene elephant relative Gomphotherium †Gomphotherium
* †Gorytes
* †Grammoptera
* †Gyaclavator – type locality for genus
** †Gyaclavator kohlsi – type locality for species
* †Gymnopternus
* †Gymnorhinus
* †Hadrianus
* Halesia
* †Hapalodectes
* †Haplolambda
* Harpalus
* †Helaletes
* †Helichus
* †Hellwigia
* Helophorus
* †Hemiauchenia
** †Hemiauchenia macrocephala
* Life restoration of the Eocene tapir relative Heptodon †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
* Life restoration of the Eocene-Miocene creodont mammal Hyaenodon †Hyaenodon
** †Hyaenodon crucians
** †Hyaenodon horridus
** †Hyaenodon mustelinus
* †Hydnobius
* Hydrangea
* Hydriomena
* †Hydriomena? protrita – tentative report
* Hydrobius
** †Hydrobius fuscipes
* †Hydromystria
* Hydrophilus
* Hydroporus
* Hydropsyche
* †Hydroptila
* A living Hygrotus predaceous diving beetle Hygrotus
* †Hylobius
* †Hymenophyllum
* †Hyopsodus
* †Hypertragulus
* †Hypisodus
* †Hypohippus
* †Hypolagus
* †Hyporhina
** †Hyporhina galbreathi – type locality for species
* †Hyrachyus
* Life restoration of the Eocene-Oligocene odd-toed ungulate Hyracodon. Charles R. Knight (1896). †Hyracodon
* †Hyracotherium
** †Hyracotherium vasacciense
* †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
* Jassus – tentative report. Lapsus calami of Iassus.
* †Judolia
** †Judolia antecurrens – type locality for species
* A living Juglans, or walnut tree Juglans
* Junco
** †Junco hyemalis
* †Juncus
* †Kalmia
* †Kimbetohia
* Koelreuteria
* †Lacon
* †Lagopus
** †Lagopus leucurus
* †Lambdotherium
* †Lapton
* A living Larus gull Larus
* Lasiopodomys
* Lasius
* Lathrobium
* Laurus
* †Lebia
* †Leia
* †Lema
* Lemmiscus
** †Lemmiscus curtatus
* Lepisosteus
* †Leptauchenia
* †Leptis
* †Leptocyon
* Life restoration of the Eocene-Oligocene even-toed ungulate Leptomeryx †Leptomeryx
* †Leptomorphus
* Leptophloeus
* †Leptostylus
* †Leptura
* Lepus
** †Lepus townsendii
* †Leucosticte
** †Leucosticte atrata
** †Leucosticte tephrocotis
* †Leucozona
* †Ligyrocoris
* †Ligyrus
* A living Limnephilus caddisfly †Limnephilus
* †Limnobium
* †Limnophila
* †Limonius
* Lindera
* †Linnaea – type locality for genus
* †Linyphia
* †Liometopum
** †Liometopum miocenicum – type locality for species
** †Liometopum scudderi – type locality for species
* †Lithocharis
* Life restoration of the Eocene butterfly Lithodryas †Lithodryas – type locality for genus
** †Lithodryas styx – type locality for species
* †Locusta
* Lomatia
* Longitarsus
* Lontra
** †Lontra canadensis – or unidentified comparable form
* †Lucanus
* †Lycosa
* †Lygaeus
* Lygodium
* Lynx
** †Lynx rufus
* Lytta
* Life restoration of the Eocene mammal Macrocranion Macrocranion
* †Macrodactylus
* †Macrophya
* †Macrorhoptus
* Magdalis
* Magnolia
* Mahonia
* †Maiorana
* †Malachius
* †Malus
* †Mammuthus
** Life restoration of a herd of Mammuthus columbi, or Columbian mammoths. The extent of the fur depicted is hypothetical. Charles R. Knight (1909). †Mammuthus columbi
* Marmota
** †Marmota flaviventris
* Martes
* †Megacerops
* Megachile
* †Megacyllene
* †Megahippus
* †Megalictis
* †Megapenthes
* †Megatylopus
* †Melanactes
* †Melanophila
* †Melieria
* †Melittomma
* †Mellinus
* Melospiza
** †Melospiza lincolnii
* †Meniscotherium
* Life restoration of the Miocene rhinoceros Menoceras †Menoceras
* 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
* Life restoration of the Eocene pangolin relative Metacheiromys †Metacheiromys
* Metachroma
* †Metarhinus
* Metasequoia
** †Metasequoia occidentalis
* †Miacis
* Miagrammopes
* †Michenia
* †Microplitis
* †Microsyops
* †Microtomarctus
* Microtus
** A living Microtus californicus, or California vole †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
* Restoration of the Pliocene-Pleistocene Miracinonyx, or American cheetah †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
* †Nephila
* †Netelia
* †Nicocles
* Mounted fossilized skeleton of the Eocene primate Notharctus †Notharctus
** †Notharctus robustior
* Notonecta
* Numenius
** †Numenius madagascariensis
* †Numitor – type locality for genus
* †Nyctea
** †Nyctea scandiaca
* Nymphaea
* Nysius
* †Nyssa
* Ochotona
** †Ochotona princeps
* †Odaxosaurus – or unidentified comparable form
** †Odaxosaurus piger
* Odocoileus
** Living male (right) and female (left) Odocoileus hemionus, or mule deer. †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
** A living Oreamnos harringtoni, or Harrington's mountain goat †Oreamnos harringtoni
* †Oreopanax
* †Orohippus
* †Orontium
* †Orphilus
* †Orthocentrus
* †Osmanthus
* †Osmunda
** †Osmunda greenlandica
* †Otiorhynchus
* Ovis
** †Ovis canadensis
* †Oxyacodon
* Restoration of the Paleocene-Eocene creodont mammal Oxyaena †Oxyaena
* †Oxycera
* †Oxyomus
* †Pachyaena
* †Paederus
* †Palaeogale
* †Palaeolagus
* †Palaeonictis
* †Palaeosinopa
** †Palaeospiza bella
* Restorative model and fossilized skull of the Eocene brontothere mammal Palaeosyops †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
* Fossilized skeleton of the Pliocene-Pleistocene ground sloth Paramylodon †Paramylodon
** †Paramylodon harlani
* †Paramys
* †Parandra
* †Paratylopus
* †Parectypodus
** †Parectypodus lunatus
* †Parictis
* †Parthenocissus
* †Passaloecus
* †Patriofelis
* Pediacus
* Pekania
* †Pellea
* Fossilized skull of the Eocene-Oligocene lizard Peltosaurus †Peltosaurus
** †Peltosaurus granulosus – type locality for species
* †Pelycodus
** †Pelycodus danielsae
** †Pelycodus jarrovii
* Penthetria – type locality for genus
* †Pepsis
* †Peraceras
* †Peratherium
* Peromyscus
** †Peromyscus maniculatus
* Persea
* Fossil of the Oligocene ant Petraeomyrmex †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
* Illustration of a fossilized skull in multiple views of the Oligocene-Miocene bone-crushing dog Phlaocyon †Phlaocyon
* Phloeosinus
* †Phora
* Phryganea
* Phrynosoma
** †Phrynosoma douglassi
* †Phylledestes – type locality for genus
** †Phylledestes vorax – type locality for species
* †Phyllobaenus
* Phyllobius
* †Phyllophaga
* †Phymatodes
* Pica
** †Pica hudsonia
* Picea
* Picoides
** †Picoides villosus
* †Pidonia
* †Pimpla
* Pinus
* †Pipiza
* †Pison
* Pituophis
** †Pituophis melanoleucus
* Platanus
* Plateumaris
* †Platycheirus
* Platydema
* Life restoration of a herd of alarmed Miocene-Pleistocene peccaries of the genus Platygonus. Charles R. Knight (1922). †Platygonus
* Platynus
* Platystethus
* Plecia
* †Plesiadapis
* †Plesiobaena
* †Pliohippus
* †Plochionus
* †Poabromylus
* Podabrus
* Podiceps
* Podilymbus
** †Podilymbus podiceps
* Life restoration of the Eocene-Oligocene camel Poebrotherium †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
* †Pristichampsus
* †Probathyopsis
* †Procas
* Illustration of a fossil of the Eocene butterfly Prodryas †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 †Protorohippus
* †Protostephanus – type locality for genus
** †Protostephanus ashmeadi – type locality for species
* †Protungulatum
** †Protungulatum donnae
* Prunus
** †Prunus gracilis
* †Psephenus
* Pseudacris
** †Pseudacris triseriata
* Restoration of the Miocene cat Pseudaelurus †Pseudaelurus
* †Pseudhipparion
* Pseudomyrmex
* †Pseudoprotoceras
* †Psittacotherium
* Ptelea
* Pterocarya
* †Pteromalus
* Pterostichus
* †Ptilodus
** †Ptilodus kummae
* †Ptosima
* Quedius
* Quercus
* Rallus
** †Rallus limicola
* †Ramoceros
* †Rallus
** †Rallus limicola
* Life restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx. Robert Bruce Horsfall (1913). †Ramoceros
* †Rana
** †Rana catesbeiana
* †Raphidia
* Reithrodontomys
* Reticulitermes
* Rhabdomastix
* †Rhagio
* Rhagonycha
* †Rhamnus
* †Rhamphomyia
* A living Rhineura floridana, or North American worm lizard Rhineura
* †Rhingia
* Rhizophagus
* Rhus
* †Rhyssa
* †Ribes
* †Robinia
* †Rogas
* Rosa
* †Rothschildia
* Rubus
* Sabal
* †Saccoloma
* Salix
* †Sambucus
* Fossilized skeleton of the Eocene monitor lizard Saniwa †Saniwa
* †Saperda
** †Saperda florissantensis – type locality for species
* †Sapindus
* †Sapromyza
* Sassafras
** †Sassafras hesperia
* Scaphinotus
* Sceloporus
** †Sceloporus undulatus
* Sciara
* †Sciophila
* Sciurus
* Scolytus
* †Segestria
* †Selaginella
* †Semanotus
* Sequoia
** Fossilized branch fragment from a Sequoia affinis †Sequoia affinis
* Serica
* †Sespia
* †Sialia
* †Sibinia
* †Sifrhippus
* Sigmodon
* †Silpha
* †Silvius
* †Sinonyx – or unidentified comparable form
* Sitona
* †Sitones
* Sitta
** †Sitta carolinensis
* †Smilax
* Mounted fossilized skeleton of the Eocene primate Smilodectes †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
* Life restoration of the Eocene brontothere mammal Sphenocoelus †Sphenocoelus
* Spilogale
** †Spilogale putorius
* Spizella
** †Spizella breweri
* †Staphylea
* Staphylinus
* †Stenolophus
* †Stenosphenus
* Stenus
* Sterculia
* Stilbus
* †Stipa
* †Strategus
* †Stylinodon
* Life restoration of the Eocene-Oligocene cow-sized rhinoceros Subhyracodon. Charles R. Knight (1890s). †Subhyracodon
* Sylvilagus
** †Sylvilagus audubonii
* †Symphoromyia
* Syrphus
* †Systena
* †Tabanus
* Tachycineta
** †Tachycineta bicolor
* Tachyporus
* †Tachys
* Tamiasciurus
** †Tamiasciurus hudsonicus
** †Tanysphyrus lemnae
* Tapirus
* Taxidea
** †Taxidea taxus
* †Teilhardina
* Restoration of the Miocene-Pliocene rhinoceros Teleoceras †Teleoceras
* †Tenor – type locality for genus
* †Tenthredo
* †Tetragnatha
* †Tetraonyx
* †Tetraopes
** †Tetraopes submersus – type locality for species
* †Tetrapus
* Thamnophis
** A living Thamnophis elegans, or western terrestrial garter snake †Thamnophis elegans
** †Thamnophis sirtalis
* †Thanasimus
* †Themira
* †Thomisus
* Thomomys
** †Thomomys talpoides
* †Thouinia
* †Thuja
* †Ticholeptus
* Tilia
* †Tingis
* Tipula – type locality for genus
* †Titanoeca
* Life restoration of the Paleocene pantodont mammal Titanoides †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
* †Trigonias
* †Trigonoscuta
* †Triplax
* †Tritemnodon
* †Triumfetta
* †Trixoscelis
* †Trogosus
* Trogoxylon
* †Trogus
* †Tropisternus
* Trox
* †Trypherus
* †Tryphon
* †Tychius
* Typha
* †Uintacyon
* †Uintascorpio – type locality for genus
* Ulmus
* †Ulus
* Urocyon
** A living Urocyon cinereoargenteus, or gray fox †Urocyon cinereoargenteus
* †Ursavus
* Ursus
** †Ursus americanus
* †Ustatochoerus
* †Vanessa
* †Vauquelinia
* †Viburnum
* †Vicia
* †Villa – type locality for genus
* Vitis
* †Viverravus
* †Vrilletta
* Mounted fossilized skeleton of the Eocene mammal Vulpavus †Vulpavus
* Vulpes
** †Vulpes velox
** †Vulpes vulpes
* †Weinmannia
* †Woodwardia
* †Xantholinus
* †Xestobium
* †Xylocopa
* †Xylomya
* †Xyronomys
* †Yumaceras
* †Zamia
* Zelkova
* Zizyphus
* Zonotrichia
** †Zonotrichia leucophrys
* †Zootermopsis
* Known material diagram depicting the Miocene-Pleistocene mastodon relative Zygolophodon with a human to scale †Zygolophodon