# List of the Cenozoic life of Colorado

This list of the Cenozoic life of Colorado contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Colorado and are between 66 million and 10,000 years of age.

## A

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* A living Abies, or fir tree Abies
** †Abies longirostris
* †Absarokius
** †Absarokius abbotti – or unidentified comparable form
** †Absarokius metoecus
* †Absyrtus
** †Absyrtus decrepitus – type locality for species
* †Acaenitus
** †Acaenitus defunctus – type locality for species
* †Acalles
** †Acalles exhumatus – type locality for species
* †Acallomyia
** †Acallomyia probolaea – type locality for species
* †Acalyptus
** †Acalyptus obtusus – type locality for species
* †Acanthomyites – type locality for genus
** †Acanthomyites aldrichi – type locality for species
* †Acarictis – or unidentified comparable form
** †Acarictis ryani
* Acer
** †Acer florissanti
** †Acer fragile
** †Acer macginitiei
** †Acer oregonianum
* †Achrestocoris – type locality for genus
** †Achrestocoris cinerarius – type locality for species
* †Acilius
** †Acilius florissantensis – type locality for species
* †Aciprion – type locality for genus
** †Aciprion formosum – type locality for species
** †Aciprion majus – type locality for species
* †Acnemia
** †Acnemia cyclosoma – type locality for species
* †Acocephalus
** †Acocephalus callosus – type locality for species
* Acris
* †Acritoparamys
** †Acritoparamys atwateri
** †Acritoparamys pattersoni
* Acrostichum
** †Acrostichum hesperium
* †Acylophorus
** †Acylophorus immotus – type locality for species
* †Adalia
** †Adalia subversa – type locality for species
* †Adelocera
** †Adelocera perantiqua – type locality for species
* †Adelopsyche – type locality for genus
** †Adelopsyche frustrans – type locality for species
* †Adjidaumo
** †Adjidaumo minimus
** †Adjidaumo minutus
* Fossilized shell of the Early Cretaceous-Oligocene turtle Adocus†Adocus
* Aegialia
** †Aegialia opaca
* †Aelurodon
** †Aelurodon asthenostylus
* Life restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920). †Aepycamelus
** †Aepycamelus giraffinus
* Aeshna
** †Aeshna larvata – type locality for species
** †Aeshna solida – type locality for species
* Agabus
** †Agabus charon – type locality for species
** †Agabus florissantensis – type locality for species
** †Agabus infuscatus
** †Agabus rathbuni – type locality for species
* †Agallia
** †Agallia abstructa – type locality for species
** †Agallia flaccida – type locality for species
** †Agallia instabilis – type locality for species
** †Agallia lewisii – type locality for species
* †Agathemera
** †Agathemera reclusa – type locality for species
* A living Agelaius Agelaius
** †Agelaius phoenicieus
* †Agenia
** †Agenia cockerellae – type locality for species
** †Agenia saxigena – type locality for species
* †Agnotocastor
** †Agnotocastor coloradensis – type locality for species
* Agoliinus
** †Agoliinus plutonicus
* Agrilus
** †Agrilus liragus
** †Agrilus praepolitus – type locality for species
* †Agrion
** †Agrion exsularis – type locality for species
** †Agrion mascescens – type locality for species
** †Agrion telluris – type locality for species
* A living Agriotes click beetle Agriotes
** †Agriotes apicalis
** †Agriotes comminutus – type locality for species
** †Agriotes nearcticus – type locality for species
* †Agromyza
** †Agromyza praecursor – type locality for species
* †Agulla
** †Agulla protomaculata – type locality for species
* †Agyrtes
** †Agyrtes primoticus – type locality for species
* †Ailanthus
** †Ailanthus americana
** †Ailanthus lesquereuxi
* †Aleocharopsis
** †Aleocharopsis caseyi – type locality for species
** †Aleocharopsis secunda – type locality for species
* †Alepidophora – type locality for genus
** †Alepidophora cockerelli – type locality for species
** †Alepidophora minor – type locality for species
** †Alepidophora pealei – type locality for species
* †Aletodon
** †Aletodon gunnelli – or unidentified comparable form
* Aleurites
** †Aleurites glandulosa
* †Alforjas – tentative report
* †Alismaphyllites
** †Alismaphyllites grandifolius
* †Allantodiopsis
** †Allantodiopsis erosa
* Life restoration of the crocodilian Allognathosuchus †Allognathosuchus
** †Allognathosuchus polyodon
* †Allophaiomys
** †Allophaiomys pliocaenicus
* †Allophylus
** †Allophylus flexifolia
* †Alomatia – type locality for genus
** †Alomatia fusca – type locality for species
* Altica
** †Altica renovata – type locality for species
* †Alticonus – type locality for genus
** †Alticonus gazini – type locality for species
* †Alysia
** †Alysia exigua – type locality for species
** †Alysia petrina – type locality for species
** †Alysia phanerognatha – type locality for species
** †Alysia ruskii – type locality for species
* Amara
** †Amara cockerelli – type locality for species
** †Amara danae – type locality for species
** †Amara powellii – type locality for species
** †Amara revocata – type locality for species
** †Amara sterilis
** †Amara veterata – type locality for species
* †Amartus
** †Amartus petrefactus – type locality for species
* †Amauropilio
** †Amauropilio atavus – type locality for species
** †Amauropilio lacoei – type locality for species
* †Amblycorypha – tentative report
** †Amblycorypha perdita – type locality for species
* †Amblyteles
** †Amblyteles pealei – type locality for species
* †Ambystoma
** †Ambystoma alamosensis – type locality for species
** †Ambystoma tigrinum
* Life restoration of the Miocene elephant relative Amebelodon. Margret Flinsch (1932). †Amebelodon
** †Amebelodon floridanus
* Amelanchier
** †Amelanchier peritula
** †Amelanchier scudderi
* Amia
* †Ammophila
** †Ammophila antiquella – type locality for species
* †Ampelopsis
** †Ampelopsis acerifolia
* †Amphechinus
** †Amphechinus horncloudi
* †Amphicerus
** †Amphicerus sublaevis
* Amphicosmus
** †Amphicosmus delicatulus – type locality for species
* †Amphicyon
** †Amphicyon galushai
** †Amphicyon ingens
* †Amphicyrta
** †Amphicyrta inhaesa – type locality for species
* Fossilized skull of the Miocene saber-toothed cat Amphimachairodus †Amphimachairodus
** †Amphimachairodus coloradensis
* †Ampliconus – type locality for genus
** †Ampliconus browni – type locality for species
* †Anabrus
** †Anabrus caudelli – type locality for species
* Anas
* †Anasa
** †Anasa priscoputida – type locality for species
* †Anatis
** †Anatis resurgens – type locality for species
* †Anchastus
** †Anchastus diluvialis – type locality for species
** †Anchastus eruptus – type locality for species
* †Anchitherium
* †Anconatus – type locality for genus
** †Anconatus dorsuosus – type locality for species
** †Anconatus niger – type locality for species
* Andrena
** †Andrena clavula – type locality for species
** †Andrena grandipes – type locality for species
** †Andrena hypolitha – type locality for species
** †Andrena lagopus
** †Andrena percontusa – type locality for species
** †Andrena sepulta – type locality for species
* †Andrenopteryx
** †Andrenopteryx willardi
* †Andrias
** †Andrias matthewi
* †Andricus
** †Andricus myricae – type locality for species
* †Anelaphus
** †Anelaphus extinctus – type locality for species
* †Anemia
** †Anemia elongata
* Fossilized tooth of the Oligocene-Miocene shark Carcharocles angustidens †Angustidens
** †Angustidens vireti
* †Anisonchus
** †Anisonchus athelas – or unidentified comparable form
* Anisotoma
** †Anisotoma sibylla – type locality for species
* †Ankylodon
** †Ankylodon annectens
* †Anobium
** †Anobium durescens – type locality for species
* †Anomala
** †Anomala exterranea – type locality for species
** †Anomala scudderi – type locality for species
* †Anomalon
** †Anomalon deletum – type locality for species
** †Anomalon excisum – type locality for species
** †Anomalon miocenicum – type locality for species
* Anser
* †Antas
** †Antas crecca
* A living Anthaxia jewel beetle Anthaxia
** †Anthaxia exhumata – type locality for species
** †Anthaxia prasina
* †Antherophagus
** †Antherophagus megalops – type locality for species
* †Anthidium
** †Anthidium exhumatum – type locality for species
** †Anthidium scudderi – type locality for species
* †Antholithes
** †Antholithes amoenus
** †Antholithes pediloides
* A living Anthomyia fly †Anthomyia
** †Anthomyia atavella – type locality for species
** †Anthomyia laminarum – type locality for species
** †Anthomyia persepulta – type locality for species
** †Anthomyia winchesteri – type locality for species
* Anthonomus
** †Anthonomus concussus – type locality for species
** †Anthonomus debilatus – type locality for species
** †Anthonomus defossus – type locality for species
** †Anthonomus evigilatus – type locality for species
** †Anthonomus primordius – type locality for species
** †Anthonomus rohweri – type locality for species
** †Anthonomus soporus
* †Anthophora
** †Anthophora melfordi – type locality for species
* †Antiacodon
** †Antiacodon pygmaeus
* A living Antilocapra, or pronghorn Antilocapra
** †Antilocapra americana
* †Antocha
** †Antocha principialis – type locality for species
* †Apanthesis – type locality for genus
** †Apanthesis leuce – type locality for species
* †Apatosciuravus
** †Apatosciuravus bifax
* †Aphaena
** †Aphaena atava – type locality for species
* Aphaenogaster
** †Aphaenogaster donisthorpei – type locality for species
** †Aphaenogaster mayri – type locality for species
* †Apheliscus
* †Aphelops
** †Aphelops malacorhinus
** †Aphelops megalodus
** †Aphelops mutilus
* †Aphidopsis
** †Aphidopsis margarum – type locality for species
* Aphodius
** †Aphodius aboriginalis – type locality for species
** †Aphodius florissantensis – type locality for species
** †Aphodius granarioides – type locality for species
** †Aphodius inundatus – type locality for species
** †Aphodius laminicola – type locality for species
** †Aphodius mediaevus – type locality for species
** †Aphodius praeemptor – type locality for species
** †Aphodius senex – type locality for species
** †Aphodius shoshonis – type locality for species
* A living Aphrophora spittlebug Aphrophora
* Apion
** †Apion attenuatum
** †Apion cockerelli – type locality for species
** †Apion evestigatum – type locality for species
* †Apocymospermum
* †Apocynophyllum
** †Apocynophyllum lesquereuxi
* †Apolysis
** †Apolysis magister – type locality for species
* †Aporema – type locality for genus
** †Aporema praestrictum – type locality for species
* †Apsilocephala
** †Apsilocephala vagabunda – type locality for species
* †Apternodus
** †Apternodus iliffensis
* Aquila
** A living Aquila chrysaetos, or golden eagle †Aquila chysaetos
* †Araneaovoius
** †Araneaovoius columbiae
* Araneus
** †Araneus absconditus – type locality for species
** †Araneus cinefactus – type locality for species
** †Araneus delitus – type locality for species
** †Araneus emertoni – type locality for species
** †Araneus kinchloeae – type locality for species
** †Araneus longimanus – type locality for species
** †Araneus meeki – type locality for species
** †Araneus vulcanalis – type locality for species
* †Archaeochrysa
** †Archaeochrysa creedei – type locality for species
** †Archaeochrysa fracta – type locality for species
** †Archaeochrysa paranervis – type locality for species
* †Archaeomnium
** †Archaeomnium brownii
* Life restoration of the Eocene-Oligocene entelodont mammal Archaeotherium †Archaeotherium
** †Archaeotherium mortoni
* †Archalia – type locality for genus
** †Archalia femorata – type locality for species
* †Archimyrmex – type locality for genus
** †Archimyrmex rostratus – type locality for species
* †Archiponera – type locality for genus
** †Archiponera wheeleri – type locality for species
* †Archiraphidia
** †Archiraphidia somnolenta – type locality for species
** †Archiraphidia tranquilla – type locality for species
** †Archiraphidia tumulata – type locality for species
* Arctobyrrhus
** †Arctobyrrhus subcanus
* Life restoration of the Paleocene mammal Arctocyon †Arctocyon
** †Arctocyon mumak
* †Arctodontomys
** †Arctodontomys nuptus
** †Arctodontomys wilsoni
* †Arctostylops – tentative report
* †Arfia
** †Arfia opisthotoma
** †Arfia shoshoniensis
* †Argia
** †Argia aliena – type locality for species
* †Arhopalus
** †Arhopalus pavitus – type locality for species
* Flower of a living Aristolochia, or birthwort †Aristolochia
** †Aristolochia mortua
* †Artimonius
** †Artimonius australis
** †Artimonius nocerai
* †Artocarpus
** †Artocarpus lessigiana
* †Asilus
** †Asilus amelanchieris – type locality for species
** †Asilus curculionis – type locality for species
** †Asilus florissantinus – type locality for species
** †Asilus peritulus – type locality for species
** †Asilus wickhami – type locality for species
* Fruit and foliage of an Asimina tree, or pawpaw †Asimina
** †Asimina vesperalis
* Asio
* †Aspicolpus
** †Aspicolpus repertus – type locality for species
* †Asplenium
** †Asplenium delicatula – or unidentified comparable form
* †Astephus
* †Aster
** †Aster florissantia
* †Asterocarpinus
** †Asterocarpinus perplexans
* A living Astronium tree, which is related to cashews †Astronium
** †Astronium calyx
** †Astronium truncatum
* Asynarchus
* Ataenius
** †Ataenius patescens – type locality for species
** †Ataenius restructus – type locality for species
* †Atalantycha
** †Atalantycha humata – type locality for species
* †Athalia
** †Athalia wheeleri – type locality for species
* Atheta
** †Atheta florissantensis – type locality for species
* A living Athous click beetle †Athous
** †Athous contusus – type locality for species
** †Athous fractus – type locality for species
** †Athous lethalis – type locality for species
* †Athyana
** †Athyana haydenii
* †Atocus – type locality for genus
** †Atocus cockerelli – type locality for species
** †Atocus defessus – type locality for species
* †Atrichops
** †Atrichops hesperius – type locality for species
* †Attagenus
** †Attagenus aboriginalis – type locality for species
** †Attagenus sopitus – type locality for species
* †Aulacidea
** †Aulacidea ampliforma – type locality for species
** †Aulacidea progenetrix – type locality for species
* †Aulacus
** †Aulacus bradleyi – type locality for species
* †Aulobaris
** †Aulobaris anicilla – type locality for species
** †Aulobaris circumscripta
** †Aulobaris damnata – type locality for species
* †Auraria – type locality for genus
** †Auraria urbana – type locality for species
* †Averrhoites
** †Averrhoites affinis
* †Axestemys – type locality for genus
** †Axestemys puercensis – or unidentified comparable form
** †Axestemys quinni – type locality for species
* Aythya
** †Aythya affinis
** †Aythya americana
* Illustration of the fossilized teeth of the Pliocene-Pleistocene rabbit relative Aztlanolagus †Aztlanolagus

## B

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Baena
** †Baena arenosa
* †Baioconodon
** †Baioconodon denverensis – type locality for species
** †Baioconodon nordicus
* †Baltemys
** †Baltemys velogastros – type locality for species
* †Baptemys
** †Baptemys wyomingensis
* †Barbouromeryx
* †Baris
** †Baris antediluviana – type locality for species
** †Baris cremastorhynchoides – type locality for species
** †Baris divisa – type locality for species
** †Baris florissantensis – type locality for species
** †Baris harlani – type locality for species
** †Baris hoveyi – type locality for species
** †Baris imperfecta – type locality for species
** †Baris matura – type locality for species
** †Baris nearctica – type locality for species
** †Baris primalis – type locality for species
** †Baris renovata – type locality for species
** †Baris schucherti – type locality for species
* Mounted fossilized skeleton of the Paleocene-Eocene pantodont mammal Barylambda †Barylambda
** †Barylambda faberi – type locality for species
* †Barylypa
** †Barylypa primigena – type locality for species
* †Bassus
** †Bassus juvenilis – type locality for species
** †Bassus miocenicus – type locality for species
** †Bassus velatus – type locality for species
* †Bathornis – type locality for genus
** †Bathornis veredus – type locality for species
* †Bathygenys
** †Bathygenys alpha
* Fossilized cranium of the Eocene uintathere mammal Bathyopsis †Bathyopsis
** †Bathyopsis fissidens
* †Belyta
** †Belyta mortuella – type locality for species
* Bembidion
** †Bembidion bimaculatum
** †Bembidion breve
** †Bembidion coloradense
** †Bembidion constricticolle
* †Bembidium
** †Bembidium florissantensis – type locality for species
** †Bembidium obductum – type locality for species
** †Bembidium tumulorum – type locality for species
* †Beringiaphyllum
** †Beringiaphyllum cupanioides
* †Beris
** †Beris miocenica – type locality for species
* A living Betula, or birch tree Betula
** †Betula stevensoni
* Bibio
** †Bibio capnodes – type locality for species
** †Bibio cockerelli – type locality for species
** †Bibio excurvatus – type locality for species
** †Bibio explanatus – type locality for species
** †Bibio jamesi – type locality for species
** †Bibio podager – type locality for species
** †Bibio vetus – type locality for species
** †Bibio vulcanius – type locality for species
** †Bibio wickhami – type locality for species
* †Bibiodes
** †Bibiodes intermedia – type locality for species
* †Bidessus
** †Bidessus laminarum – type locality for species
* Bison
** †Bison antiquus – or unidentified comparable form
** Mounted fossilized skeleton of the Pleistocene Bison latifrons, or long-horned bison †Bison latifrons
* †Blapstinus
** †Blapstinus linellii – type locality for species
* †Blechnum
** †Blechnum anceps
* Bledius
** †Bledius osborni
** †Bledius primitiarum – type locality for species
** †Bledius soli – type locality for species
** †Bledius suturalis
* †Blickomylus
** †Blickomylus galushai
* Boletina
** †Boletina hypogaea – type locality for species
* Fossilized skeleton of the Late Cretaceous-Eocene crocodilian Borealosuchus †Borealosuchus
* †Borophagus
** †Borophagus pugnator
* †Bouromeryx
** †Bouromeryx americanus – type locality for species
* †Brachinus
** †Brachinus newberryi – type locality for species
** †Brachinus repressus – type locality for species
* Restorative portrait of the Miocene oreodont mammal Brachycrus †Brachycrus
* †Brachyerix
** †Brachyerix macrotis
* Brachylagus
** †Brachylagus coloradoensis – type locality for species
* †Brachyprotoma
** †Brachyprotoma obtusata
* †Brachypsalis
** †Brachypsalis modicus
* †Brachyrhynchocyon
* †Brachyspathus – type locality for genus
** †Brachyspathus curiosus – type locality for species
* †Brachytarsus – tentative report
** †Brachytarsus dubius – type locality for species
* Bracon
** †Bracon abstractus – type locality for species
** †Bracon cockerelli – type locality for species
** †Bracon resurrectus – type locality for species
* A living Bruchus leaf beetle †Bruchus
** †Bruchus aboriginalis – type locality for species
** †Bruchus anilis – type locality for species
** †Bruchus antaeus – type locality for species
** †Bruchus bowditchi – type locality for species
** †Bruchus carpophiloides – type locality for species
** †Bruchus dormescens – type locality for species
** †Bruchus exhumatus – type locality for species
** †Bruchus henshawi – type locality for species
** †Bruchus osborni – type locality for species
** †Bruchus succintus – type locality for species
* †Bruesisca
** †Bruesisca submersus – type locality for species
* Bubo
** A living Bubo virginianus, or great horned owl †Bubo virginianus
* Bufo
** †Bufo cognatus
** †Bufo douglassi
** †Bufo woodhousei
* †Bunophorus
** †Bunophorus grangeri
** †Bunophorus pattersoni
** †Bunophorus robustus
** †Bunophorus sinclairi
* †Buprestis
** †Buprestis florissantensis – type locality for species
** †Buprestis megistarche – type locality for species
** †Buprestis scudderi – type locality for species
* †Bursera
** †Bursera serrulata
* A living Buteo hawk Buteo
** †Buteo fluviaticus – type locality for species
* Byrrhus
** †Byrrhus eximius
** †Byrrhus romingeri
* †Bythoscopus
** †Bythoscopus lapidescens – type locality for species

## C

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Cacalydus – type locality for genus
** †Cacalydus exstirpatus – type locality for species
** †Cacalydus lapsus – type locality for species
* †Cacogaster – type locality for genus
** †Cacogaster novamaculatus – type locality for species
* †Cacoschistus – type locality for genus
** †Cacoschistus maceriatus – type locality for species
* †Caenocholax
** †Caenocholax barkleyi – type locality for species
** †Caenocholax palusaxus – type locality for species
* Flower of a living Caesalpinia †Caesalpinia
** †Caesalpinia pecorae
* †Caesalpinites
** †Caesalpinites acuminatus
** †Caesalpinites coloradicus
* †Calamagras – type locality for genus
** †Calamagras angulatus – type locality for species
** †Calamagras murivorus – type locality for species
** †Calamagras talpivorus – type locality for species
* †Calandrites
** †Calandrites cineratius
** †Calandrites defessus
** †Calandrites hindsi – type locality for species
** †Calandrites ursorum – type locality for species
* †Calcarius
** A living Calcarius lapponicus, or Lapland longspur †Calcarius lapponicus
** †Calcarius ornatus
* †Calippus
** †Calippus regulus
* †Caliroa
** †Caliroa micrarche – type locality for species
** †Caliroa mimus – type locality for species
** †Caliroa revelata – type locality for species
* †Callidiopsites – type locality for genus
** †Callidiopsites grandiceps – type locality for species
* †Callimoxys
** †Callimoxys primordialis – type locality for species
* †Callomyia – tentative report
** †Callomyia hypolitha – type locality for species
* Calosoma
** †Calosoma calvini – type locality for species
** †Calosoma cockerelli – type locality for species
** †Calosoma emmonsi – type locality for species
* †Calyptapis – type locality for genus
** †Calyptapis florissantensis – type locality for species
* Life restoration of the Pliocene-Holocene camel Camelops †Camelops
** †Camelops hesternus
* †Camerotops
** †Camerotops solidatus – type locality for species
* Camponotus
** †Camponotus fuscipennis – type locality for species
** †Camponotus microcephalus – type locality for species
** †Camponotus petrifactus – type locality for species
* Canis
** †Canis edwardii – or unidentified comparable form
** †Canis latrans
* †Cantius
** †Cantius abditus
** †Cantius frugivorus
** †Cantius mckennai
** †Cantius ralstoni
* †Capnobotes
** †Capnobotes silens
* †Capnochroa
** †Capnochroa senilis – type locality for species
* †Capsus
** †Capsus lacus – type locality for species
** †Capsus obsolefactus – type locality for species
* †Carabites – tentative report
** †Carabites arapahoensis – type locality for species
* Carabus
** †Carabus jeffersoni – type locality for species
* †Cardichelyon
** †Cardichelyon rogerwoodi – or unidentified comparable form
* †Cardiolophus
** †Cardiolophus radinskyi
* A living Cardiophorus click beetle †Cardiophorus
** †Cardiophorus cockerelli – type locality for species
** †Cardiophorus deprivatus – type locality for species
** †Cardiophorus exhumatus – type locality for species
** †Cardiophorus florissantensis – type locality for species
** †Cardiophorus lithographicus – type locality for species
** †Cardiophorus requiescens – type locality for species
* Cardiospermum
** A Cardiospermum coloradensis leaf†Cardiospermum coloradensis
** †Cardiospermum terminalis
* †Cariblattoides
** †Cariblattoides labandeirai – type locality for species
* †Carmelus
** †Carmelus gravatus – type locality for species
** †Carmelus sepositus – type locality for species
* †Carpites
** †Carpites gemmaceus
** †Carpites miliodes
* †Carpocyon
** †Carpocyon compressus
** †Carpocyon robustus
* Carpodacus
** †Carpodacus cassinii
* †Carpodaptes
** †Carpodaptes aulacodon – type locality for species
** †Carpodaptes cygneus
* †Carpophilus
** †Carpophilus restructus – type locality for species
* A living Carya, or hickory tree Carya
** †Carya antiquorum
** †Carya florissantensis
** †Carya libbeyi
* Castanea
** †Castanea dolichophylla
** †Castanea intermedia
* †Catobaris – type locality for genus
** †Catobaris coenosa – type locality for species
* †Catopamera – type locality for genus
** †Catopamera augheyi – type locality for species
** †Catopamera bradleyi – type locality for species
* †Catopsalis
** †Catopsalis alexanderi – type locality for species
* †Catopsylla – type locality for genus
** †Catopsylla crawfordi – type locality for species
** †Catopsylla prima – type locality for species
* †Cecidomyia – tentative report
** †Cecidomyia pontaniiformis
* Cedrela
** †Cedrela lancifolia
* †Cedrelospermum
** †Cedrelospermum lineatum
* †Cedromus
** †Cedromus wardi
* †Celastrilex – type locality for genus
** †Celastrilex artocarpidioides – type locality for species. Formerly classified as Celastrinites artocarpidioides.
* †Celastrinites
** †Celastrilex artocarpidioides – type locality for species. Later reclassified as Celastrilex artocarpidioides.
* Foliage and fruit of a living Celastrus, or staff vine †Celastrus
** †Celastrus typica
** †Celastrus winchesteri
* Celtis
** †Celtis mccoshii
* †Centetodon
** †Centetodon magnus
** †Centetodon marginalis
** †Centetodon patratus – type locality for species
* †Centimanomys
** †Centimanomys galbreathi
** †Centimanomys major
* †Centrinus
** †Centrinus hypogaeus – type locality for species
** †Centrinus obnuptus – type locality for species
** †Centrinus vulcanicus – type locality for species
* †Centrocerus
** †Centrocerus urophasianus
* †Centron – type locality for genus
** †Centron moricollis – type locality for species
* †Cephalomyrmex – type locality for genus
** †Cephalomyrmex rotundatus – type locality for species
* †Ceratina
** †Ceratina disrupta – type locality for species
* Life restoration of the Paleocene-Eocene crocodilian Ceratosuchus †Ceratosuchus – type locality for genus
** †Ceratosuchus burdoshi – type locality for species
* †Ceraturgus
** †Ceraturgus praecursor – type locality for species
* Cercidiphyllum
** †Cercidiphyllum arcticum
* Cercis
** †Cercis parvifolia
* †Cercocarpus
** †Cercocarpus myricaefolius
* †Cercopis
** †Cercopis cephalinus – type locality for species
** †Cercopis suffocata – type locality for species
* †Ceropalites – type locality for genus
** †Ceropalites infelix – type locality for species
* †Ceruchus
** †Ceruchus fuchsii – type locality for species
* Cervus
** A living Cervus elaphus, or red deer †Cervus elaphus
* Ceutorhynchus
** †Ceutorhynchus blaisdelli – type locality for species
** †Ceutorhynchus clausus – type locality for species
** †Ceutorhynchus compactus – type locality for species
** †Ceutorhynchus degravatus – type locality for species
** †Ceutorhynchus duratus – type locality for species
** †Ceutorhynchus irvingi – type locality for species
* Chaetodipus
** †Chaetodipus hispidus
* †Chaetopleurophora
** †Chaetopleurophora laminarum – type locality for species
* †Chaetoptelea
** †Chaetoptelea microphylla
* †Chalcis
** †Chalcis perdita – type locality for species
** †Chalcis praevalens
** †Chalcis praevolans – type locality for species
** †Chalcis tortilis – type locality for species
* †Chalepus
** †Chalepus americanus – type locality for species
* †Chalybion
** †Chalybion mortuum – type locality for species
* †Chamaecyparis
** †Chamaecyparis linguaefolia
* A stand of living Chamaedorea palms †Chamaedorea
** †Chamaedorea danae
* †Chaneya
** †Chaneya tenuis†Chaneya tenuis
* Charina
** †Charina prebottae
* †Chauliognathus
** †Chauliognathus pristinus – type locality for species
* †Cheilophis – type locality for genus
** †Cheilophis huerfanoensis – type locality for species
* Cheilosia
** †Cheilosia hecate – type locality for species
** †Cheilosia miocenica – type locality for species
** †Cheilosia scudderi – type locality for species
** †Cheilosia sepultula – type locality for species
* †Chelonarium
** †Chelonarium montanum – type locality for species
* †Chelonus
** †Chelonus depressus – type locality for species
** †Chelonus muratus – type locality for species
** †Chelonus solidus – type locality for species
* †Chilocorus
** †Chilocorus ulkei – type locality for species
* †Chionaemopsis – type locality for genus
** †Chionaemopsis quadrifasciatus – type locality for species
* †Chiromyoides
** †Chiromyoides caesor
** †Chiromyoides gigas
** †Chiromyoides potior – type locality for species
* A living Chironomus midge Chironomus
** †Chironomus almelanderi – type locality for species
** †Chironomus depletus – type locality for species
** †Chironomus patens – type locality for species
** †Chironomus pausatus – type locality for species
** †Chironomus primaevus – type locality for species
** †Chironomus pristinus – type locality for species
** †Chironomus proterus – type locality for species
** †Chironomus requiescens – type locality for species
** †Chironomus scudderiellus – type locality for species
* Chondestes
** †Chondestes grammacus
* †Chriacus
** †Chriacus gallinae
* †Chrysis
** †Chrysis miocenica – type locality for species
** †Chrysis rohweri – type locality for species
* †Chrysobothris
** †Chrysobothris coloradensis – type locality for species
** †Chrysobothris gahani – type locality for species
** †Chrysobothris haydeni – type locality for species
** †Chrysobothris suppressa – type locality for species
* †Chrysogaster
** †Chrysogaster antiquarius – type locality for species
* Chrysomela
** †Chrysomela vesperalis – type locality for species
* †Cicada
** †Cicada grandiosa – type locality for species
* †Cicadella
** †Cicadella scudderi – type locality for species
* †Cimbex
** †Cimbex vetusculus – type locality for species
* †Cimexomys
** †Cimexomys arapahoensis – type locality for species
** †Cimexomys minor
* A living Cinnamomum, or cinnamon tree Cinnamomum
** †Cinnamomum sezannense
* †Cissites
** †Cissites rocklandensis
* Cissus
** †Cissus marginata
* †Cixius – tentative report
** †Cixius proavus – type locality for species
* †Cladius
** †Cladius petrinus – type locality for species
* †Cladoneura – type locality for genus
** †Cladoneura willistoni – type locality for species
* †Cladura
** †Cladura integra – type locality for species
** †Cladura maculata – type locality for species
* †Clastoptera
** †Clastoptera comstocki – type locality for species
* A living Cleonus weevil †Cleonus
** †Cleonus degeneratus – type locality for species
** †Cleonus estriatus – type locality for species
** †Cleonus exterraneus – type locality for species
** †Cleonus foersteri – type locality for species
** †Cleonus primoris – type locality for species
** †Cleonus rohweri – type locality for species
* †Closterocoris
** †Closterocoris elegans – type locality for species
* †Clubiona
** †Clubiona arcana
** †Clubiona curvispinosa – type locality for species
** †Clubiona eversa – type locality for species
** †Clubiona florissanti – type locality for species
* †Clytus
** †Clytus pervetustus – type locality for species
* A living Coccinella ladybug †Coccinella
** †Coccinella florissantensis – type locality for species
** †Coccinella sodoma – type locality for species
* †Coccotorus
** †Coccotorus principalis – type locality for species
** †Coccotorus requiescens – type locality for species
* †Coeliodes
** †Coeliodes primotinus – type locality for species
* Colaptes
** †Colaptes auratus
* †Colaspis
** †Colaspis aetatis – type locality for species
** †Colaspis diluvialis – type locality for species
** †Colaspis proserpina – type locality for species
* †Colastes
** †Colastes abrogatus – type locality for species
* †Colemanus – type locality for genus
** †Colemanus keeleyorum – type locality for species
* †Collops
** †Collops desuetus – type locality for species
** †Collops extrusus – type locality for species
** †Collops priscus – type locality for species
* †Colopterus
** †Colopterus pygidialis – type locality for species
* †Colpoclaenus
** †Colpoclaenus keeferi
* A living member of Colubrina †Colubrina
** †Colubrina spireaefolia
** †Colubrina spireafollia
* †Compsemys
** †Compsemys victa
* †Comptosia – type locality for genus
** †Comptosia miranda – type locality for species
* †Conacodon
** †Conacodon delphae – type locality for species
** †Conacodon harbourae – type locality for species
** †Conacodon matthewi – type locality for species
* †Coniatus
** †Coniatus refractus
* Conotelus
** †Conotelus obscurus
* A living Conotrachelus weevil †Conotrachelus
** †Conotrachelus florissantensis – type locality for species
* †Contogenys – or unidentified related form
* †Convolvulites
** †Convolvulites orichitus
* †Conzattia
** †Conzattia coriacea – type locality for species
* †Copecion
** †Copecion brachypternus
* †Copelemur
** †Copelemur praetutus
* †Cophocoris – type locality for genus
** †Cophocoris tenebricosus – type locality for species
* †Cophura
** †Cophura antiquella – type locality for species
* †Copidita
** †Copidita miocenica – type locality for species
* †Coptochromus – type locality for genus
** †Coptochromus manium – type locality for species
* †Cordilura
** †Cordilura exhumata – type locality for species
* †Corethra
** †Corethra exita – type locality for species
* Corixa
** †Corixa immersa – type locality for species
** †Corixa vanduzeei – type locality for species
* †Corizus
** †Corizus abditivus – type locality for species
** †Corizus celatus – type locality for species
** †Corizus somnurnus – type locality for species
* †Cormocyon
** †Cormocyon copei
* Fossilized skeleton preserved in situ (upper left, 2) of the Miocene-Pliocene horse Cormohipparion †Cormohipparion
** †Cormohipparion quinni
** †Cormohipparion sphenodus
* Cornus
** †Cornus hyperborea
* †Corphyra
** †Corphyra calypso – type locality for species
* Corticaria
** †Corticaria aeterna – type locality for species
** †Corticaria egregia – type locality for species
** †Corticaria occlusa – type locality for species
** †Corticaria petrefacta – type locality for species
* Corvus
** †Corvus brachyrhynchos
** †Corvus corax
* †Corylus
** †Corylus insignis
* Life restoration of the Paleocene-Eocene pantodont mammal Coryphodon. Heinrich Harder (1920). †Coryphodon
** †Coryphodon armatus
** †Coryphodon eocaenus
* Cossonus
** †Cossonus gabbii – type locality for species
** †Cossonus rutus – type locality for species
* †Cotinus
** †Cotinus fraterna
* †Crabro
** †Crabro longaevus – type locality for species
* †Cratacanthus
** †Cratacanthus florissantensis – type locality for species
* Fruit of four difference species of Crataegus, or hawthorn tree Crataegus
** †Crataegus copeana
** †Crataegus hendersoni
** †Crataegus nupta
* †Cremastorhynchus
** †Cremastorhynchus stabilis
* †Cremastosaurus – type locality for genus
** †Cremastosaurus carinicollis – type locality for species
** †Cremastosaurus rhambastes – type locality for species
* †Cremnops
** †Cremnops florissanticola – type locality for species
* †Creniphilites – type locality for genus
** †Creniphilites orpheus – type locality for species
* †Crioceridea – type locality for genus
** †Crioceridea dubia – type locality for species
* Crotalus
** A living Crotalus viridis, or prairie rattlesnake †Crotalus viridis
* †Croton
** †Croton furculatum
* †Cryptagriotes – type locality for genus
** †Cryptagriotes minusculus – type locality for species
* †Cryptocephalus
** †Cryptocephalus miocenus – type locality for species
* †Cryptocheilus
** †Cryptocheilus florissantensis – type locality for species
** †Cryptocheilus hypogaeus – type locality for species
** †Cryptocheilus laminarum – type locality for species
** †Cryptocheilus scudderi – type locality for species
** †Cryptocheilus senex – type locality for species
* †Cryptochromus – type locality for genus
** †Cryptochromus letatus – type locality for species
* Cryptohypnus
** †Cryptohypnus exterminatus – type locality for species
** †Cryptohypnus hesperus – type locality for species
* A living Cryptophagus silken fungus beetle Cryptophagus
** †Cryptophagus bassleri – type locality for species
** †Cryptophagus petricola – type locality for species
** †Cryptophagus scudderi – type locality for species
* Cryptorhynchus
** †Cryptorhynchus annosus
** †Cryptorhynchus coloradensis – type locality for species
** †Cryptorhynchus durus – type locality for species
** †Cryptorhynchus evinctus – type locality for species
** †Cryptorhynchus fallii – type locality for species
** †Cryptorhynchus kerri – type locality for species
** †Cryptorhynchus profusus – type locality for species
* †Cryptus
** †Cryptus delineatus – type locality for species
* †Ctereacoris – type locality for genus
** †Ctereacoris primigenus – type locality for species
* A living Culex mosquito Culex
** †Culex winchesteri – type locality for species
* †Curculio
** †Curculio anicularis – type locality for species
** †Curculio beeklyi – type locality for species
** †Curculio curvirostris – type locality for species
** †Curculio duttoni – type locality for species
** †Curculio extinctus – type locality for species
** †Curculio femoratus
** †Curculio flexirostris – type locality for species
** †Curculio florissantensis – type locality for species
** †Curculio minusculoides – type locality for species
** †Curculio minusculus
** †Curculio restrictus – type locality for species
* †Cursoricoccyx – type locality for genus
** †Cursoricoccyx geraldinae – type locality for species
* †Cuterebra
** †Cuterebra ascarides – type locality for species
** †Cuterebra bibosa – type locality for species
* †Cychramites – type locality for genus
** †Cychramites hirtus – type locality for species
* †Cyclotrachelus
** †Cyclotrachelus tenebricus – type locality for species
* †Cydamus
** †Cydamus robustus – type locality for species
* †Cydnopsis
** †Cydnopsis handlirschi – type locality for species
* †Cylindrodon
** †Cylindrodon nebraskensis
* †Cylindrotoma
** †Cylindrotoma veterana – type locality for species
* †Cynarctoides
** †Cynarctoides acridens
* Fossilized cranium of the Miocene bear-dog Cynelos †Cynelos
* Cynomys
** †Cynomys niobrarius
** †Cynomys spenceri – or unidentified comparable form
* †Cyperacites
** †Cyperacites lacustris – type locality for species
* †Cyphomyia
** †Cyphomyia rohweri – type locality for species
* Cyphon
* †Cyphus
** †Cyphus florissantensis – type locality for species
* †Cypris
** †Cypris florissantensis – type locality for species
* †Cyrtapis – type locality for genus
** †Cyrtapis anomala – type locality for species
* †Cyrtomon
** †Cyrtomon subterraneus – type locality for species
* Cytilus
** †Cytilus tartarinus – type locality for species
* †Cyttaromyia
** †Cyttaromyia obdurescens – type locality for species
** †Cyttaromyia princetoniana – type locality for species
** †Cyttaromyia reclusa – type locality for species

## D

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Daphne
** †Daphne septentrionalis
* Daphnia
* Life restoration of the Eocene-Miocene bear dog Daphoenus †Daphoenus
** †Daphoenus vetus
* †Dartonius
** †Dartonius jepseni
* †Dascillus
** †Dascillus lithographicus – type locality for species
* †Davidia
** †Davidia antiqua
* †Deleaster
** †Deleaster grandiceps – type locality for species
* †Delphax
** †Delphax senilis – type locality for species
** †Delphax veterum – type locality for species
* †Demophorus
** †Demophorus antiquus – type locality for species
* †Denaeaspis – type locality for genus
** †Denaeaspis chelonopsis – type locality for species
* †Dendragopus
** †Dendragopus obscurus
* Living Dennstaedtia, or hayscented ferns †Dennstaedtia
** †Dennstaedtia americana
* †Denverus – type locality for genus
** †Denverus middletoni – type locality for species
* †Dermatobia
** †Dermatobia hydropica – type locality for species
* †Dermestes
** †Dermestes tertiarius – type locality for species
* †Derobrochus – type locality for genus
** †Derobrochus abstractus – type locality for species
** †Derobrochus caenulentus – type locality for species
** †Derobrochus commoratus – type locality for species
** †Derobrochus craterae – type locality for species
** †Derobrochus frigescens – type locality for species
** †Derobrochus marcidus – type locality for species
** †Derobrochus typharum – type locality for species
* †Desmatoclaenus
** †Desmatoclaenus protogonioides – or unidentified comparable form
* †Desmatomyia – type locality for genus
** †Desmatomyia scopulicornis – type locality for species
* †Detyopsis – type locality for genus
** †Detyopsis packardi – type locality for species
** †Detyopsis scudderi – type locality for species
* †Deviacer
* †Diabrotica
** †Diabrotica bowditchiana – type locality for species
** †Diabrotica exesa – type locality for species
** †Diabrotica florissantella – type locality for species
** †Diabrotica uteana – type locality for species
* Restoration of two of the Eocene even-toed ungulate Diacodexis being hunted by a primitive whale †Diacodexis
** †Diacodexis kelleyi
** †Diacodexis metsiacus – or unidentified comparable form
** †Diacodexis minutus
** †Diacodexis primus
** †Diacodexis secans – or unidentified comparable form
* †Diacodon
** †Diacodon alticuspis – or unidentified comparable form
* †Dialysis
** †Dialysis revelata – type locality for species
* Dialytes
* Dialytodius
** †Dialytodius decipiens
* Diamesa
** †Diamesa extincta – type locality for species
* †Dianthidium
** †Dianthidium tertiarium – type locality for species
* †Diaplegma – type locality for genus
** †Diaplegma abductum – type locality for species
** †Diaplegma haldemani – type locality for species
** †Diaplegma occultorum – type locality for species
** †Diaplegma ruinosum – type locality for species
** †Diaplegma venerabile – type locality for species
** †Diaplegma veterascens – type locality for species
* Restoration of the Oligocene-Miocene hornless rhinoceros Diceratherium. Robert Bruce Horsfall (1913). †Diceratherium
** †Diceratherium tridactylum
* †Dicerca
** †Dicerca eurydice – type locality for species
* Dicranomyia
** †Dicranomyia faecarius – type locality for species
** †Dicranomyia fontainei – type locality for species
** †Dicranomyia fragilis – type locality for species
** †Dicranomyia inferna – type locality for species
** †Dicranomyia loewi – type locality for species
** †Dicranomyia longipes – type locality for species
** †Dicranomyia primitiva
** †Dicranomyia rohweri – type locality for species
** †Dicranomyia saxetana – type locality for species
** †Dicranomyia stagnorum
** †Dicranomyia stigmosa
* A living Dicranota hairy-eyed cranefly †Dicranota
** †Dicranota cockerelli – type locality for species
* †Dictyla
** †Dictyla veterana – type locality for species
* †Dictyophara
** †Dictyophara bouvei – type locality for species
* †Dictyoraphidia
** †Dictyoraphidia veterana – type locality for species
* †Didelphodus
** †Didelphodus absarokae
** †Didelphodus altidens
* †Didymictis
** †Didymictis altidens
** †Didymictis leptomylus
** †Didymictis protenus
** †Didymictis proteus – or unidentified comparable form
** †Didymictis vancleveae
* †Didymosphaeria
** †Didymosphaeria betheli
* †Dikkomys
* †Dilaropsis – type locality for genus
** †Dilaropsis ornatus – type locality for species
* †Dillenites
** †Dillenites garfieldensis
* †Dilophodon
* †Dineura
** †Dineura cockerelli – type locality for species
** †Dineura fuscipennis – type locality for species
** †Dineura laminarum – type locality for species
** †Dineura microsoma – type locality for species
** †Dineura saxorum – type locality for species
* Life restoration of the Eocene-Miocene false saber-toothed cat Dinictis. Robert Bruce Horsfall (1913). †Dinictis
* †Dinidorites – type locality for genus
** †Dinidorites margiformis – type locality for species
* †Dinoderus
** †Dinoderus cuneicollis – type locality for species
* †Dinohippus
** †Dinohippus interpolatus – or unidentified comparable form
* †Dioctria
** †Dioctria florissantina – type locality for species
** †Dioctria pulveris – type locality for species
* Dioscorea
* †Diplodipelta – type locality for genus
** †Diplodipelta reniptera
* †Diplolophus
** †Diplolophus insolens
* †Diploptera
** †Diploptera gemini – type locality for species
** †Diploptera savba – type locality for species
** †Diploptera vladimir – type locality for species
* Diplotaxis – tentative report
* Diplotaxis
** †Diplotaxis aurora – type locality for species
** †Diplotaxis simplicipes – type locality for species
* Dipodomys
** A living Dipodomys ordii, or Ord's kangaroo rat †Dipodomys ordii
* †Dipsalidictis
** †Dipsalidictis transiens
* Dipteronia
** †Dipteronia brownii
** †Dipteronia insignis
* †Dissacus
** †Dissacus navajovius
* †Docimus – type locality for genus
** †Docimus psylloides – type locality for species
* †Docirhynchus
** †Docirhynchus terebrans – type locality for species
* Dodonaea
** †Dodonaea umbrina
* Preserved Dolichoderus ant Dolichoderus
** †Dolichoderus antiquus – type locality for species
** †Dolichoderus kohlsi – type locality for species
** †Dolichoderus rohweri – type locality for species
* †Dolichomyia
** †Dolichomyia tertiaria – type locality for species
** †Dolichomyia testea – type locality for species
* Dolurgus
** †Dolurgus pumilus
* †Dombeyopsis
** †Dombeyopsis magnifica
* †Dominickus – type locality for genus
** †Dominickus castnioides – type locality for species
* †Domnina
** †Domnina gradata
** †Domnina thompsoni – or unidentified comparable form
* †Domninoides
* Donacia
* Dorytomus
** †Dorytomus coercitus – type locality for species
** †Dorytomus williamsi – type locality for species
* †Doxocopa
** †Doxocopa wilmattae – type locality for species
* †Drassonax
** †Drassonax harpagops – type locality for species
* †Drepanomeryx – tentative report
** †Drepanomeryx falciformis
* Fossilized horns, jaws, and limb bones of the Miocene deer relative Dromomeryx †Dromomeryx
** †Dromomeryx borealis – type locality for species
* †Dryobius
** †Dryobius miocenicus – type locality for species
* Dryocoetes – type locality for genus
** †Dryocoetes diluvialis – type locality for species
* Dryopteris
** †Dryopteris guyottii
** †Dryopteris lakesi
** †Dryopteris serrata
* Dyschirius
* †Dyscoletes
** †Dyscoletes soporatus – type locality for species
* †Dysdercus
** †Dysdercus cinctus – type locality for species
** †Dysdercus unicolor – type locality for species
* †Dyspetochrysa
** †Dyspetochrysa vetuscula – type locality for species

## E

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Earinus
** †Earinus saxatilis – type locality for species
* †Ecclesimus
** †Ecclesimus tenuiceps
* †Echinaphis – type locality for genus
** †Echinaphis rohweri – type locality for species
* Fossilized shell of the Eocene turtle Echmatemys †Echmatemys
** †Echmatemys lativertebralis – or unidentified comparable form
** †Echmatemys septaria
** †Echmatemys stevensoniana – tentative report
* †Ectobius
** †Ectobius kohlsi – type locality for species
* †Ectocion
** †Ectocion major
** †Ectocion medituber
** †Ectocion osbornianus
** †Ectocion parvus
* †Ectoconus
** †Ectoconus ditrigonus
* †Ectoganus
** †Ectoganus lobdelli
* †Ectopria
** †Ectopria laticollis – type locality for species
* †Ectypodus
** †Ectypodus childei – or unidentified comparable form
** †Ectypodus musculus – type locality for species
** †Ectypodus tardus
* †Elaeomyrmex – type locality for genus
** †Elaeomyrmex coloradensis – type locality for species
** †Elaeomyrmex gracilis – type locality for species
* †Elaphidion
** †Elaphidion fracticorne – type locality for species
* Elaphropus
** †Elaphropus incurvus
* †Elater
** †Elater florissantensis – type locality for species
** †Elater rohweri – type locality for species
** †Elater scudderi – type locality for species
* Eleodes
** †Eleodes granulatus – or unidentified comparable form
* †Elidiptera
** †Elidiptera regularis – type locality for species
* †Emiliana – type locality for genus
** †Emiliana alexandri – type locality for species
* A living Empis daggerfly †Empis
** †Empis florissantana – type locality for species
** †Empis infossa – type locality for species
** †Empis miocenica – type locality for species
** †Empis perdita – type locality for species
* †Enallagma
** †Enallagma florissantella – type locality for species
** †Enallagma mortuella – type locality for species
** †Enallagma oblisum – type locality for species
* Engelhardtia
** †Engelhardtia uintaensis – type locality for species
* Enochrus
** †Enochrus hamiltoni
** †Enochrus scudderi – type locality for species
* †Entimus
** †Entimus primordialis – type locality for species
* Life restoration of a pair of the Eocene uintathere mammal Eobasileus. Charles R. Knight (1890s). †Eobasileus
** †Eobasileus cornutus
* †Eobruneria – type locality for genus
** †Eobruneria tessellata – type locality for species
* †Eobumbatrix
** †Eobumbatrix latebrosa – type locality for species
* †Eocleonus – type locality for genus
** †Eocleonus subjectus – type locality for species
* †Eocuculus – type locality for genus
** †Eocuculus cherpinae – type locality for species
* †Eodiplurina – type locality for genus
** †Eodiplurina cockerelli – type locality for species
* †Eoerianthus – type locality for genus
** †Eoerianthus eocaenicus – type locality for species
** †Eoerianthus multispinosa – type locality for species
* †Eoformica – type locality for genus
** †Eoformica globularis – type locality for species
** †Eoformica magna – type locality for species
** †Eoformica pinguis – type locality for species
* †Eofulgorella – type locality for genus
** †Eofulgorella bradburyi – type locality for species
* †Eoglyptosaurus
** †Eoglyptosaurus donohoei
* †Eogryllus
** †Eogryllus elongatus – type locality for species
** †Eogryllus unicolor – type locality for species
* †Eohemichroa
** †Eohemichroa eophila – type locality for species
* Life restoration of the Eocene horse Eohippus. Heinrich Harder (1920). †Eohippus
** †Eohippus angustidens
* †Eolestes – type locality for genus
** †Eolestes syntheticus – type locality for species
* †Eoliarus – type locality for genus
** †Eoliarus quadristictus – type locality for species
* †Eomerope – type locality for genus
** †Eomerope tortriciformis – type locality for species
* †Eomogoplistes – type locality for genus
** †Eomogoplistes longipennis – type locality for species
* †Eomyza – type locality for genus
** †Eomyza holoptera – type locality for species
* †Eopachylosticta
** †Eopachylosticta byrami – type locality for species
* †Eophlebomyia – type locality for genus
** †Eophlebomyia claripennis – type locality for species
* †Eopimpla – type locality for genus
** †Eopimpla grandis – type locality for species
* †Eosacantha – type locality for genus
** †Eosacantha delocranioides – type locality for species
* †Eostentatrix
** †Eostentatrix cockerelli – type locality for species
** †Eostentatrix ostentata – type locality for species
* †Eotetrix – type locality for genus
** †Eotetrix unicornis – type locality for species
* †Eothes – type locality for genus
** †Eothes elegans – type locality for species
* †Eotingis – type locality for genus
** †Eotingis antennata – type locality for species
* Life restoration of the Eocene brontothere mammal Eotitanops †Eotitanops
** †Eotitanops borealis
* †Eotrella – type locality for genus
** †Eotrella mira – type locality for species
* †Eotylopus
* †Eozacla
** †Eozacla arachnomorpha – type locality for species
** †Eozacla problematica – type locality for species
* †Epallagites – type locality for genus
** †Epallagites avus – type locality for species
* †Epanuraea – type locality for genus
** †Epanuraea ingenita – type locality for species
* †Ephalus
** †Ephalus adumbratus – type locality for species
* Living member of the shrub genus Ephedra, which includes the joint-pines and Mormon tea Ephedra
** †Ephedra miocenica
* †Ephemera
** †Ephemera exsucca – type locality for species
** †Ephemera howarthi – type locality for species
** †Ephemera immobilis – type locality for species
** †Ephemera interempta – type locality for species
** †Ephemera macilenta – type locality for species
** †Ephemera pumicosa – type locality for species
** †Ephemera tabifica – type locality for species
* †Epicaerus
** †Epicaerus effossus
** †Epicaerus eradicatus
** †Epicaerus evigoratus
** †Epicaerus exanimis
** †Epicaerus excissus – type locality for species
** †Epicaerus saxatilis
** †Epicaerus subterraneus
** †Epicaerus terrosus
* Epicauta
** †Epicauta subneglecta – type locality for species
* Mounted fossilized skeleton of the Miocene bone-crushing dog Epicyon †Epicyon
** †Epicyon haydeni
* †Epihippus
** †Epihippus gracilis
* †Epiphloeus
** †Epiphloeus pristinus – type locality for species
* Epuraea
** †Epuraea planulata
* †Epyris
** †Epyris deletus – type locality for species
* †Equisetum
** †Equisetum florissantense
** †Equisetum winchesteri
* Equus
** †Equus conversidens
** †Equus francisci
** †Equus scotti – or unidentified comparable form
** Fossilized skeleton of the Pliocene-Pleistocene horse Equus simplicidens, also known as the Hagerman horse or American zebra †Equus simplicidens
* Eremophila
** †Eremophila alpestris
* Erethizon
* Eriocampa
** †Eriocampa bruesi – type locality for species
** †Eriocampa celata – type locality for species
** †Eriocampa disjecta – type locality for species
** †Eriocampa pristina – type locality for species
** †Eriocampa scudderi – type locality for species
** †Eriocampa synthetica – type locality for species
* †Eriophyes – tentative report
** †Eriophyes beutenmulleri
* †Eristalis
** †Eristalis lapideus – type locality for species
* †Ernobius
** †Ernobius effetus – type locality for species
* †Erycus
** †Erycus brevicollis – type locality for species
* †Esthonyx
** †Esthonyx acutidens
** †Esthonyx bisulcatus
** †Esthonyx spatularius
* †Eterochalcis
** †Eterochalcis scudderi – type locality for species
* A living Ethmia moth †Ethmia
** †Ethmia mortuella – type locality for species
* †Etirocoris – type locality for genus
** †Etirocoris infernalis – type locality for species
* †Eubazus
** †Eubazus wilmattae – type locality for species
* †Eucallimyia
** †Eucallimyia fortis – type locality for species
* †Eucicones
** †Eucicones oblongopunctata – type locality for species
* Eucnecosum
** †Eucnecosum brachypterum
** †Eucnecosum brunnescens
** †Eucnecosum tenue
* †Eucnemis
** †Eucnemis antiquatus – type locality for species
* Foliage and flowers of a living Eucommia tree †Eucommia
** †Eucommia serrata
* †Eucorites – type locality for genus
** †Eucorites serescens – type locality for species
* †Eudasytites – type locality for genus
** †Eudasytites listriformis – type locality for species
* †Eudomus
** †Eudomus pinguis
** †Eudomus robustus
* Eugenia
** †Eugenia americana
** †Eugenia arenaceaeformis
* †Eugnamptidea – type locality for genus
** †Eugnamptidea florissantensis – type locality for species
** †Eugnamptidea robusta – type locality for species
** †Eugnamptidea tertiaria – type locality for species
* †Eulithomyrmex – type locality for genus
** Fossil found in Colorado; the holotype specimen of the Eocene ant Eulithomyrmex †Eulithomyrmex rugosus – type locality for species
** †Eulithomyrmex striatus – type locality for species
* †Eumys
** †Eumys brachyodus
** †Eumys elegans
* †Euparius
** †Euparius adumbratus – type locality for species
** †Euparius arcessitus – type locality for species
* Euphorbia
** †Euphorbia minuta
* †Euphorus
** †Euphorus indurescens – type locality for species
* †Eurhinus
** †Eurhinus occultus – type locality for species
* †Euroxenomys
* †Eurytoma
** †Eurytoma sepulta – type locality for species
** †Eurytoma sequax – type locality for species
* Eutamias
** A living Tamias minimus (formerly Eutamias minimus), or least chipmunk †Eutamias minimus – or unidentified comparable form
* †Eutrichopleurus
** †Eutrichopleurus miocenus – type locality for species
* †Eutypomys
** †Eutypomys parvus
* †Evopes
** †Evopes occubatus – type locality for species
** †Evopes veneratus – type locality for species
* Exechia
** †Exechia priscula – type locality for species
* †Exenterus
** †Exenterus dormitans – type locality for species
* †Exetastes
** †Exetastes inveteratus – type locality for species
* †Exitelus – type locality for genus
** †Exitelus exsanguis – type locality for species
* †Exochilum
** †Exochilum inusitatum – type locality for species
* †Exochus
** †Exochus captus – type locality for species
* †Exostinus – type locality for genus
** †Exostinus serratus – type locality for species

## F

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Fagopsis
** †Fagopsis longifolia
* Falcipennis
** †Falcipennis canadenis
* Falco
** A living Falco sparverius, or American kestrel †Falco sparverius
* †Fenusa – type locality for genus
** †Fenusa parvus – type locality for species
** †Fenusa primula – type locality for species
* †Fibla
** †Fibla exusta – type locality for species
* Ficus
** †Ficus affinis
** †Ficus artocarpoides
** †Ficus bruesi
** †Ficus florissantella
** †Ficus florissantia
** †Ficus minutidens
** †Ficus planicostata
** †Ficus subtruncata
** †Ficus uncata
* †Figites
** †Figites solus – type locality for species
* †Florimena – type locality for genus
** †Florimena impressa – type locality for species
* †Floriscolia – type locality for genus
** †Floriscolia relicta – type locality for species
* †Florissantia (planthopper) – type locality for genus
** †Florissantia elegans – type locality for species
* Florissantia sp. fossil flower †Florissantia (plant) – type locality for genus
** †Florissantia speirii
* †Florissantinus – type locality for genus
** †Florissantinus angulatus – type locality for species
* †Florissantoraphidia
** †Florissantoraphidia funerata – type locality for species
** †Florissantoraphidia mortua – type locality for species
* > Formica
** †Formica cockerelli – type locality for species
** †Formica grandis – type locality for species
** †Formica neorufibarbis
** †Formica robusta – type locality for species
* †Fornax
** †Fornax relictus – type locality for species
* †Frangulops – type locality for genus
** †Frangulops pseudostenophylla – type locality for species. Formerly known as Ilex pseudostenophylla.
* †Franimys – tentative report
* †Fraxinus
** †Fraxinus eocenica
* Fulgora
** †Fulgora obticescens – type locality for species
* Fulica
** A living Fulica americana, or American coot Fulica americana
* †Fuscus – tentative report
** †Fuscus faecatus – type locality for species

## G

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Galesimorpha
** †Galesimorpha wheeleri – type locality for species
* †Gastrallanobium – type locality for genus
** †Gastrallanobium subconfusum – type locality for species
* †Gaurotes
** †Gaurotes striatopunctatus – type locality for species
* †Gelastops
** †Gelastops parcus
* †Geocoris
** †Geocoris infernorum – type locality for species
* Geodromicus
** †Geodromicus abditus – type locality for species
* Geomys
** A living Geomys bursarius, or Plains pocket gopher †Geomys bursarius
* †Geotiphia – type locality for genus
** †Geotiphia foxiana – type locality for species
** †Geotiphia halictina – type locality for species
** †Geotiphia pachysoma – type locality for species
** †Geotiphia sternbergi – type locality for species
* †Geralophus
** †Geralophus antiquarius
** †Geralophus discessus – type locality for species
** †Geralophus fossicius
** †Geralophus lassatus
** †Geralophus occultus
** †Geralophus pumiceus – type locality for species
** †Geralophus repositus
** †Geralophus retritus – type locality for species
** †Geralophus saxuosus – type locality for species
** †Geralophus scudderi – type locality for species
* †Geranchon – type locality for genus
** †Geranchon davisii – type locality for species
* †Geron – tentative report
** †Geron platysoma – type locality for species
* †Geroncolabis
** †Geroncolabis commixta – type locality for species
** †Geroncolabis tertiaria – type locality for species
* Gerris
** †Gerris protobates – type locality for species
* Mounted fossilized skeleton of the Miocene-Pleistocene camel Titanotylopus †Gigantocamelus
* †Glossina – type locality for genus
** †Glossina oligocenus – type locality for species
** †Glossina osborni – type locality for species
* †Glypta
** †Glypta aurora – type locality for species
* †Glyptosaurus
** †Glyptosaurus sylvestris
* †Glyptostrobu
** †Glyptostrobu nordenskioldi
* Glyptostrobus
** †Glyptostrobus nordenskioldi
* †Gnathium
** †Gnathium aetatis – type locality for species
* Gnophomyia
** †Gnophomyia seiverti – type locality for species
* †Gomphocerus
** †Gomphocerus abstrusus – type locality for species
* Mounted fossilized skeleton of the Miocene-Pleistocene elephant relative Gomphotherium †Gomphotherium
** †Gomphotherium obscurum
* †Gonodera
** †Gonodera antiqua – type locality for species
** †Gonodera vulcanica – type locality for species
* †Gorytes
** †Gorytes archoryctes – type locality for species
* †Grammoptera
** †Grammoptera nanella – type locality for species
* †Gregorymys
** †Gregorymys larsoni
* †Gryllacris
** †Gryllacris cineris – type locality for species
** †Gryllacris mutilata – type locality for species
* Fossil found in Garfield County; the holotype specimen of the Eocene lace bug Gyaclavator †Gyaclavator – type locality for genus
** †Gyaclavator kohlsi – type locality for species
* †Gymnetron
** †Gymnetron antecurrens – type locality for species
* †Gymnopternus
** †Gymnopternus lacustris – type locality for species
* †Gymnorhinus
** †Gymnorhinus cyanocephatus
* †Gypona
** †Gypona cinercia – type locality for species
* †Gyrophaena
** †Gyrophaena saxicola – type locality for species

## H

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Hadrianus
** †Hadrianus corsoni
* †Hadronema
** †Hadronema cinerescens – type locality for species
* Halesia
** †Halesia reticulata
* †Hammapteryx
** †Hammapteryx ceryniiformis – type locality for species
** †Hammapteryx lepidoides – type locality for species
** †Hammapteryx tripunctata – type locality for species
* Restoration of the Paleocene-Eocene mesonychian mammal Hapalodectes (below) †Hapalodectes
** †Hapalodectes leptognathus – or unidentified comparable form
* †Haplaletes
** †Haplaletes pelicatus
* †Haploconus
** †Haploconus entoconus – or unidentified comparable form
* †Haplolambda
** †Haplolambda quinni
* †Haplomylus
** †Haplomylus simpsoni
** †Haplomylus speirianus
* Harpalus
** †Harpalus maceratus – type locality for species
** †Harpalus nuperus – type locality for species
** †Harpalus redivivus – type locality for species
** †Harpalus ulomaeformis – type locality for species
** †Harpalus veterum – type locality for species
** †Harpalus whitfieldii
* †Harrymys
* †Heeria – type locality for genus
** †Heeria foeda – type locality for species
** †Heeria gulosa – type locality for species
** †Heeria lapidosa – type locality for species
* †Helaletes
** †Helaletes nanus – or unidentified comparable form
* †Helichus
** †Helichus eruptus – type locality for species
** †Helichus tenuior – type locality for species
* †Heliscomys
** †Heliscomys vetus
* †Hellwigia
** †Hellwigia obsoleta – type locality for species
* Helophorus
** †Helophorus auricollis
** †Helophorus eclectus
* †Hemiacodon
* Fossilized lower jaw of the Miocene-Pleistocene llama relative Hemiauchenia †Hemiauchenia
** †Hemiauchenia macrocephala
* †Hemiteles
** †Hemiteles lapidescens – type locality for species
** †Hemiteles obtectus – type locality for species
** †Hemiteles priscus – type locality for species
** †Hemiteles veternus – type locality for species
* †Heptacodon
* †Heptodon
** †Heptodon calciculus
** †Heptodon posticus
* †Heriades
** †Heriades bowditchi – type locality for species
** †Heriades halictinus – type locality for species
** †Heriades laminarum – type locality for species
** †Heriades mersatus – type locality for species
** †Heriades mildredae – type locality for species
** †Heriades priscus – type locality for species
** †Heriades saxosus – type locality for species
* †Herpetotherium
** †Herpetotherium fugax
** †Herpetotherium innominatum
** †Herpetotherium knighti
* Hersiliola
* †Hesperagrion
** †Hesperagrion praevolans – type locality for species
* †Hesperhys
* Life restoration of the Eocene-Oligocene dog Hesperocyon. Robert Bruce Horsfall (1913). †Hesperocyon
** †Hesperocyon coloradensis
** †Hesperocyon gregarius
* †Hesperolagomys
* Heterodon
** †Heterodon nasicus
* †Heteromyza
** †Heteromyza detecta – type locality for species
** †Heteromyza miocenica – type locality for species
* †Heterothops
** †Heterothops conticens – type locality for species
* †Hexacodus
** †Hexacodus pelodes
* †Hexerites – type locality for genus
** †Hexerites primalis – type locality for species
* Heyderia fungus growing among moss †Heyderia
** †Heyderia coloradensis – type locality for species
* †Hiatensor
** †Hiatensor semirutus – type locality for species
* †Hipporhinops – type locality for genus
** †Hipporhinops sternbergi – type locality for species
* †Hirmoneura – type locality for genus
** †Hirmoneura willistoni – type locality for species
* Holbrookia
** †Holbrookia maculata
* †Holcorpa – type locality for genus
** †Holcorpa maculosa – type locality for species
* †Homoeogamia
** †Homoeogamia ventriosa – type locality for species
* Fossilized skull of the Eocene tapir-like mammal Homogalax †Homogalax
** †Homogalax protapirinus
* †Hoplia
** †Hoplia striatipennis – type locality for species
* †Hoplisidia – type locality for genus
** †Hoplisidia kohliana – type locality for species
* †Hoplocampa
** †Hoplocampa ilicis – type locality for species
* †Hoplochelys
** †Hoplochelys crassa
* †Horistonotus
** †Horistonotus coloradensis – type locality for species
* †Hormorus
** †Hormorus saxorum – type locality for species
* †Humulus
** †Humulus florissantellus
* Life restoration of the Eocene-Miocene creodont mammal Hyaenodon †Hyaenodon
** †Hyaenodon crucians
** †Hyaenodon horridus
** †Hyaenodon mustelinus
* †Hydnobius
** †Hydnobius tibialis – type locality for species
* Hydraena
** †Hydraena circulata – or unidentified comparable form
* Hydrangea
** †Hydrangea antica
** †Hydrangea fraxinifolia
* Hydriomena – tentative report
** †Hydriomena? protrita – type locality for species
* Hydrobius
** A living Hydrobius fuscipes water scavenger beetle †Hydrobius fuscipes
** †Hydrobius maceratus – type locality for species
** †Hydrobius prisconatator – type locality for species
** †Hydrobius titan – type locality for species
* †Hydromystria
** †Hydromystria expansa
* Hydrophilus
** †Hydrophilus extricatus – type locality for species
* Hydroporus
** †Hydroporus sedimentorum – type locality for species
* Hydropsyche
** †Hydropsyche marcens – type locality for species
** †Hydropsyche operta – type locality for species
** †Hydropsyche scudderi – type locality for species
* †Hydroptila
** †Hydroptila phileos – type locality for species
* A living Hygrotus predaceous diving beetle Hygrotus
** †Hygrotus miocenus – type locality for species
* Hylastes
** †Hylastes americanus – type locality for species
** †Hylastes nigrinus
* †Hylesinus – type locality for genus
** †Hylesinus dormiscens – type locality for species
** †Hylesinus extractus – type locality for species
** †Hylesinus hydropicus – type locality for species
* †Hylobius
** †Hylobius lacoei – type locality for species
* †Hylomeryx
* Hylurgops
** †Hylurgops piger – type locality for species
* †Hymenophyllum
** †Hymenophyllum confusum
* †Hymenorus
** †Hymenorus haydeni – type locality for species
* Life restoration of the Eocene odd-toed ungulate Hyopsodus †Hyopsodus
** †Hyopsodus loomisi
** †Hyopsodus lysitensis
** †Hyopsodus paulus
** †Hyopsodus powellianus
** †Hyopsodus simplex
** †Hyopsodus walcottianus
** †Hyopsodus wortmani
* †Hypertragulus
** †Hypertragulus calcaratus
* †Hypisodus
** †Hypisodus minimus
* Hypnum
** †Hypnum coloradense
** †Hypnum haydenii
* †Hypohippus
** †Hypohippus osborni – type locality for species
* †Hypolagus
* †Hyporhina
** †Hyporhina galbreathi – type locality for species
* †Hyposodus
** †Hyposodus loomisi
* †Hyrachyus
** †Hyrachyus modestus
* Life restoration of the Eocene-Oligocene odd-toed ungulate Hyracodon. Charles R. Knight (1896). †Hyracodon
** †Hyracodon arcidens – type locality for species
** †Hyracodon leidyanus
** †Hyracodon nebraskensis
* †Hyracotherium
** †Hyracotherium vasacciense
* †Hystricops

## I

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ichneumon
** †Ichneumon alpha – type locality for species
** †Ichneumon concretus – type locality for species
** †Ichneumon decrepitus – type locality for species
** †Ichneumon dormitans – type locality for species
** †Ichneumon exesus – type locality for species
** †Ichneumon obduratus – type locality for species
** †Ichneumon petrinus – type locality for species
** †Ichneumon pollens – type locality for species
** †Ichneumon primigenius – type locality for species
** †Ichneumon provectus – type locality for species
** †Ichneumon somniatus – type locality for species
** †Ichneumon torpefactus – type locality for species
* †Ignacius
** †Ignacius frugivorus
* Foliage and fruit of a living Ilex, or holly Ilex
** †Ilex artocarpidioides
** †Ilex knightiaefolia
** †Ilex pseudostenophylla – type locality for species. Later reclassified in the new genus Frangulops.
* †Indusia
** †Indusia cypridis – type locality for species
* †Iridomyrmex
** †Iridomyrmex florissantius – type locality for species
** †Iridomyrmex obscurans – type locality for species
* Ischnoptera
** †Ischnoptera brunneri – type locality for species
* Mounted fossilized skeleton of the Eocene-Oligocene rodent Ischyromys †Ischyromys
** †Ischyromys douglassi – or unidentified comparable form
** †Ischyromys typus
** †Ischyromys veterior – or unidentified comparable form
* †Isectolophus
** †Isectolophus annectens
* †Isoetites
** †Isoetites horridus
* †Isomira
** †Isomira aurora – type locality for species
** †Isomira florissantensis – type locality for species
* †Isothea – type locality for genus
** †Isothea alleni – type locality for species
* †Isotrilophus
** †Isotrilophus rasnitsyni – type locality for species
* †Iulus
** †Iulus florissantellus – type locality for species

## J

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Jadera
** †Jadera interita – type locality for species
* †Janus
** †Janus disperditus – type locality for species
* †Jassopsis – type locality for genus
** †Jassopsis evidens – type locality for species
* Jassus – tentative report. Lapsus calami of Iassus.
** †"Jassus" latebrae – type locality for species
* †Judolia
** †Judolia antecurrens – type locality for species
* A living Juglans, or walnut tree Juglans
** †Juglans berryana
* Junco
** †Junco hyemalis
* †Juncus
** †Juncus crassulus
* †Jungermanniopsis
** †Jungermanniopsis cockerellii
* †Jupitellia – type locality for genus
** †Jupitellia charon – type locality for species

## K

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Flowers of a living Kalmia shrub †Kalmia
** †Kalmia elliptica
* †Kimbetohia
** †Kimbetohia mziae – type locality for species
* †Knightomys
** †Knightomys depressus
** †Knightomys huerfanensis
* Koelreuteria
** †Koelreuteria alleni
* †Kohlsimyrma – type locality for genus
** †Kohlsimyrma gracilis – type locality for species
** †Kohlsimyrma laticeps – type locality for species
** †Kohlsimyrma longiceps – type locality for species
* †Kronolictus – type locality for genus
** †Kronolictus scudderiellus – type locality for species
** †Kronolictus vulcanus – type locality for species

## L

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Laasbium – type locality for genus
** †Laasbium agassizii – type locality for species
** †Laasbium sectile – type locality for species
* †Labandeiraia – type locality for genus
** †Labandeiraia americaborealis – type locality for species
* †Labidolemur
** †Labidolemur kayi
** †Labidolemur serus
** †Labidolemur soricoides – type locality for species
* †Labiduromma
** †Labiduromma avia – type locality for species
** †Labiduromma bormansi – type locality for species
* †Laccopygus – type locality for genus
** †Laccopygus nilesii – type locality for species
* †Lachnopus
** †Lachnopus humatus – type locality for species
** †Lachnopus recuperatus – type locality for species
* †Lacon
** †Lacon exhumatus – type locality for species
* A living Lagopus leucura, or white-tailed ptarmigan, in full summer plumage †Lagopus
** †Lagopus leucurus
* †Lambdotherium
** †Lambdotherium popoagicum – type locality for species
* †Lampronota
** †Lampronota pristina – type locality for species
** †Lampronota stygialis – type locality for species
** †Lampronota tenebrosa – type locality for species
* †Lapton
** †Lapton daemon – type locality for species
* Larus
* †Lasiopa
** †Lasiopa carpenteri – type locality for species
* Lasiopodomys
** †Lasiopodomys deceitensis
* Lasius
** †Lasius peritulus – type locality for species
* †Lastrea
** †Lastrea goldiana
* Lathrobium
** †Lathrobium antediluvianum – type locality for species
* †Laurophyllum
** †Laurophyllum caudatum
** †Laurophyllum perseanum
* Living Laurus, or laurel trees Laurus
** †Laurus socialis
* †Lebia
** †Lebia protospiloptera – type locality for species
* †Leguminosites
** †Leguminosites coloradensis
** †Leguminosites lespedezoides – type locality for species
** †Leguminosites lesquereuxiana
* †Leia
** †Leia miocenica – type locality for species
* †Lema
** †Lema evanescens – type locality for species
** †Lema fortior – type locality for species
** †Lema lesquereuxi – type locality for species
* Lemmiscus
** †Lemmiscus curtatus
* †Lepismophlebia
** †Lepismophlebia platymera – type locality for species
* Illustration of a living Lepisosteus, or gar Lepisosteus
* †Leptacinus
** †Leptacinus exsucidus – type locality for species
** †Leptacinus fossus – type locality for species
** †Leptacinus leidyi – type locality for species
** †Leptacinus maclurei – type locality for species
** †Leptacinus rigatus – type locality for species
* †Leptacodon
** †Leptacodon tener – type locality for species
* †Leptarctus
** †Leptarctus primus
* †Leptauchenia
** †Leptauchenia decora
** †Leptauchenia major
* †Leptis
** †Leptis mystaceaeformis – type locality for species
* †Leptobatopsis
** †Leptobatopsis ashmeadii – type locality for species
* †Leptobrochus – type locality for genus
** †Leptobrochus luteus – type locality for species
* †Leptochoerus
** †Leptochoerus spectabilis
* Illustration of a fossilized skull of the Oligocene-Miocene dog Leptocyon †Leptocyon
** †Leptocyon vafer
* †Leptogaster
** †Leptogaster prior – type locality for species
* †Leptomeryx
** †Leptomeryx esulcatus
** †Leptomeryx evansi
** †Leptomeryx speciosus
* †Leptomorphus
** †Leptomorphus palaeospilus – type locality for species
* Leptophloeus
** †Leptophloeus alternans – or unidentified comparable form
* †Leptostylus
** †Leptostylus scudderi – type locality for species
* †Leptotomus
** †Leptotomus parvus
* †Leptura
** †Leptura petrorum – type locality for species
** †Leptura ponderosissima – type locality for species
** †Leptura wickhami – type locality for species
* Lepus
** A living Lepus townsendii, or white-tailed jackrabbit †Lepus townsendii
* †Lestomyia
** †Lestomyia miocenica – type locality for species
* †Leucosticte
** †Leucosticte atrata
** †Leucosticte tephrocotis
* †Leucozona
** †Leucozona nigra – type locality for species
* †Libellulapis – type locality for genus
** †Libellulapis antiquorum – type locality for species
** †Libellulapis wilmattae – type locality for species
* †Lichnanthe
** †Lichnanthe defuncta – type locality for species
* †Ligyrocoris
** †Ligyrocoris exsuctus – type locality for species
* †Ligyrus
** †Ligyrus compositus – type locality for species
** †Ligyrus effetus – type locality for species
* A living Limnephilus caddisfly †Limnephilus
** †Limnephilus eocenicus – type locality for species
* †Limnerium
** †Limnerium consuetum – type locality for species
** †Limnerium depositum – type locality for species
** †Limnerium plenum – type locality for species
** †Limnerium tectum – type locality for species
** †Limnerium vetustum – type locality for species
* †Limnobium
** †Limnobium obliteratum
* †Limnocema
** †Limnocema lutescens – type locality for species
** †Limnocema marcescens – type locality for species
** †Limnocema mortoni – type locality for species
** †Limnocema sternbergi – type locality for species
** †Limnocema styx – type locality for species
* †Limnoecus
** †Limnoecus compressus
* †Limnophila
** †Limnophila rogersii – type locality for species
** †Limnophila vasta – type locality for species
* †Limnophilus
** †Limnophilus soporatus – type locality for species
* †Limnopsyche – type locality for genus
** †Limnopsyche dispersa – type locality for species
* †Limonius
** †Limonius aboriginalis – type locality for species
** †Limonius florissantensis – type locality for species
** †Limonius praecursor – type locality for species
** †Limonius shoshonis – type locality for species
** †Limonius volans – type locality for species
* Lindera
** †Lindera coloradica – type locality for species
** †Lindera obtusata
** †Lindera varifolia – type locality for species
* Flowers of a living Linnaea †Linnaea – type locality for genus
** †Linnaea abolita – type locality for species
** †Linnaea carcerata – type locality for species
** †Linnaea evoluta – type locality for species
** †Linnaea gravida – type locality for species
** †Linnaea holmesii – type locality for species
** †Linnaea putnami – type locality for species
* †Linyphia
** †Linyphia byrami – type locality for species
** †Linyphia florissanti – type locality for species
** †Linyphia pachygnathoides – type locality for species
** †Linyphia retensa – type locality for species
** †Linyphia seclusa – type locality for species
* Preserved Liometopum ant †Liometopum
** †Liometopum miocenicum – type locality for species
** †Liometopum scudderi – type locality for species
* †Listrochelus
** †Listrochelus puerilis – type locality for species
* †Listroderes
** †Listroderes differens – type locality for species
** †Listroderes evisceratus – type locality for species
* †Lithagrion
** †Lithagrion hyalinum – type locality for species
* †Lithandrena – type locality for genus
** †Lithandrena saxorum – type locality for species
* †Lithanthidium – type locality for genus
** †Lithanthidium pertriste – type locality for species
* †Lithecphora – type locality for genus
** †Lithecphora diaphana – type locality for species
** †Lithecphora murata – type locality for species
** †Lithecphora setigera – type locality for species
** †Lithecphora unicolor – type locality for species
* †Lithembia
** †Lithembia florissantensis – type locality for species
* †Litheuphaea
** †Litheuphaea coloradensis – type locality for species
* †Lithocharis
** †Lithocharis scottii – type locality for species
* †Lithochromus – type locality for genus
** †Lithochromus extraneus – type locality for species
** †Lithochromus gardneri – type locality for species
** †Lithochromus mortuarius – type locality for species
** †Lithochromus obstrictus – type locality for species
* †Lithocicada – type locality for genus
** †Lithocicada perita – type locality for species
* †Lithocoris – type locality for genus
** †Lithocoris evulsus – type locality for species
* †Lithocoryne – type locality for genus
** †Lithocoryne arcuata – type locality for species
** †Lithocoryne coloradensis – type locality for species
** †Lithocoryne gravis – type locality for species
* Life restoration of the Eocene butterfly Lithodryas †Lithodryas – type locality for genus
** †Lithodryas styx – type locality for species
* †Lithogryllites
** †Lithogryllites lutzii – type locality for species
* †Litholabis
** †Litholabis gilberti – type locality for species
* †Lithomacratria – type locality for genus
** †Lithomacratria mirabilis – type locality for species
* †Lithomyza – type locality for genus
** †Lithomyza condita – type locality for species
* †Lithophotina – type locality for genus
** †Lithophotina costalis – type locality for species
** †Lithophotina floccosa – type locality for species
* †Lithophthorus – type locality for genus
** †Lithophthorus rugosicollis – type locality for species
* †Lithopsis
** †Lithopsis delicata – type locality for species
** †Lithopsis dubiosa – type locality for species
** †Lithopsis fimbriata – or unidentified comparable form
** †Lithopsis simillima – type locality for species
* †Lithoserix – type locality for genus
** †Lithoserix williamsi – type locality for species
* †Lithosmylus
** †Lithosmylus columbianus – type locality for species
* †Lithotiphia – type locality for genus
** †Lithotiphia scudderi – type locality for species
* †Lithymnetes – type locality for genus
** †Lithymnetes guttatus – type locality for species
* †Litobrochus – type locality for genus
** †Litobrochus externatus – type locality for species
* †Litomylus
** †Litomylus ishami
* †Locrites – type locality for genus
** †Locrites copei – type locality for species
** †Locrites whitei – type locality for species
* †Locusta
** †Locusta silens – type locality for species
* Lomatia
* †Lomatites
** †Lomatites spinosa
* Longitarsus
* Lontra
** Pair of living Lontra canadensis, or North American river otter †Lontra canadensis – or unidentified comparable form
* †Lophiparamys
** †Lophiparamys debequensis
* Lordithon
** †Lordithon durabilis – type locality for species
** †Lordithon funditus – type locality for species
** †Lordithon longiceps
** †Lordithon lyelli – type locality for species
** †Lordithon stygis – type locality for species
* †Loveina
** †Loveina zephyri
* †Lowesaurus
** †Lowesaurus matthewi – type locality for species
* †Loxolophus
** †Loxolophus hyattianus
* †Lucanus
** †Lucanus fossilis – type locality for species
* †Lucidota
** †Lucidota prima – type locality for species
* †Ludiophanes – type locality for genus
** †Ludiophanes haydeni – type locality for species
* †Ludius
** †Ludius exanimatus – type locality for species
** †Ludius granulicollis – type locality for species
** †Ludius heeri – type locality for species
** †Ludius laevissimus – type locality for species
** †Ludius primitivus – type locality for species
** †Ludius propheticus – type locality for species
** †Ludius restructus – type locality for species
** †Ludius submersus – type locality for species
* †Luperodes
** †Luperodes submonilis – type locality for species
* †Lutrochites – type locality for genus
** †Lutrochites lecontei – type locality for species
* A living Lycosa wolf spider †Lycosa
** †Lycosa florissanti – type locality for species
* †Lygaeus
** †Lygaeus faeculentus – type locality for species
** †Lygaeus obsolescens – type locality for species
** †Lygaeus stabilitus – type locality for species
* Lygodium
** †Lygodium coloradense
** †Lygodium kaulfussi
* Lynx
** †Lynx rufus
* Lytta
** †Lytta lithophila – type locality for species

## M

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Macratria
** †Macratria gigantea – type locality for species
* Life restoration of the Eocene mammal Macrocranion Macrocranion
** †Macrocranion nitens
* †Macrodactylus
** †Macrodactylus pluto – type locality for species
** †Macrodactylus propheticus – type locality for species
* †Macrophya
** †Macrophya pervetusta – type locality for species
* †Macrorhoptus
** †Macrorhoptus intutus – type locality for species
* Magdalis
** †Magdalis lecontei
** †Magdalis sedimentorum – type locality for species
* Close-up view of a Magnolia flower Magnolia
** †Magnolia berryi
** †Magnolia magnifolia
** †Magnolia regalis
** †Magnolia rotundifolia
* Mahonia
** †Mahonia marginata
** †Mahonia obliqua – type locality for species
** †Mahonia subdenticulata
* †Maiorana
* †Malachius
** †Malachius immurus – type locality for species
* †Malus
** †Malus florissantensis
** †Malus pseudocredneria
* †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
* †Manapsis – type locality for genus
** †Manapsis anomala – type locality for species
* Marmota
** †Marmota flaviventris
* †Marquettia
** †Marquettia americana – type locality for species
* Marsilea
** †Marsilea sprungerorum
* Martes
* †Masteutes
** †Masteutes rupis – type locality for species
** †Masteutes saxifer – type locality for species
* †Mataeoschistus – type locality for genus
** †Mataeoschistus limigenus – type locality for species
* †Matthewlabis
** †Matthewlabis cedrensis
* †Mattimys
* †Mecistoneuron – type locality for genus
** †Mecistoneuron perpetuum – type locality for species
* Mecocephala
* Life restoration of the Eocene brontothere mammal Megacerops †Megacerops
** †Megacerops kuwagatarhinus
* Megachile
** †Megachile praedicta – type locality for species
* †Megacyllene
** †Megacyllene florissantensis – type locality for species
* †Megadelphus
** †Megadelphus lundeliusi
* †Megahippus
* †Megalagus
** †Megalagus brachydon
** †Megalagus brachyodon
** †Megalagus turgidus
* †Megalesthonyx
* †Megalictis
* †Megapenthes
** †Megapenthes primaevus – type locality for species
* †Megaraphidia – type locality for genus
** †Megaraphidia elegans – type locality for species
** †Megaraphidia exhumata – type locality for species
* †Megatryphon – type locality for genus
** †Megatryphon mortiferus – type locality for species
* †Megatylopus
** †Megatylopus gigas – or unidentified comparable form
* †Megaxyela
** †Megaxyela petrefacta – type locality for species
* †Melanactes
** †Melanactes cockerelli – type locality for species
* †Melanagrion
** †Melanagrion nigerrimum – type locality for species
** †Melanagrion umbratum – type locality for species
* †Melanagromyza
** †Melanagromyza prisca – type locality for species
** †Melanagromyza tephrias – type locality for species
* †Melanderella
** †Melanderella glossalis – type locality for species
* †Melanophila
** †Melanophila cockerellae – type locality for species
** †Melanophila handlirschi – type locality for species
** †Melanophila heeri – type locality for species
* Melanthrips
** †Melanthrips extincta – type locality for species
* †Melieria
** †Melieria atavina – type locality for species
** †Melieria calligrapha – type locality for species
* †Melittomma
** †Melittomma lacustrinum – type locality for species
* †Mellinus
** †Mellinus handlirschi – type locality for species
* Melospiza
** †Melospiza lincolnii
* †Meniscotherium
** †Meniscotherium chamense
** †Meniscotherium tapiacitum
* Life restoration of the Miocene rhinoceros Menoceras †Menoceras
** †Menoceras barbouri
* Mephitis
** †Mephitis mephitis
* †Meracantha
** †Meracantha lacustris – type locality for species
* †Merychippus
** †Merychippus coloradense
** †Merychippus sejunctus
* †Merychyus
** †Merychyus arenarum
** †Merychyus elegans – type locality for species
* †Merycochoerus
** †Merycochoerus magnus
** †Merycochoerus matthewi
* †Merycodus
** †Merycodus warreni
* †Merycoidodon – type locality for genus
** †Merycoidodon culbertsoni – type locality for species
** †Merycoidodon major
* †Mesatirhinus
** †Mesatirhinus junius
* †Mesobrochus – type locality for genus
** †Mesobrochus imbecillus – type locality for species
** †Mesobrochus lethaeus – type locality for species
* †Mesochorus
** †Mesochorus abolitus – type locality for species
** †Mesochorus aboriginalis – type locality for species
** †Mesochorus carceratus – type locality for species
** †Mesochorus cataclysmi – type locality for species
** †Mesochorus dormitorius – type locality for species
** †Mesochorus lapideus – type locality for species
** †Mesochorus revocatus – type locality for species
** †Mesochorus terrosus – type locality for species
* Skull fossils of the Oligocene-Miocene dog Mesocyon †Mesocyon
** †Mesocyon temnodon
* †Mesodma
** †Mesodma ambigua
** †Mesodma hensleighi
* †Mesogaulus
** †Mesogaulus paniensis
* †Mesohippus
** †Mesohippus bairdi
* †Mesoleptus
** †Mesoleptus apertus – type locality for species
** †Mesoleptus exstirpatus – type locality for species
* †Mesoneura
** †Mesoneura vexabilis – type locality for species
* Life restoration of the Eocene mammal Mesonyx †Mesonyx
** †Mesonyx obtusidens
* †Mesopimpla – type locality for genus
** †Mesopimpla sequoiarum – type locality for species
* †Mesostenus
** †Mesostenus modestus – type locality for species
* Messor
** †Messor sculpturatus – type locality for species
* †Metacheiromys
* Metachroma
** †Metachroma florissantensis – type locality for species
* †Metarhinus
* Metasequoia
** †Metasequoia occidentalis
* †Metechinus
** †Metechinus amplior
* †Metoecus
** †Metoecus geikiei – type locality for species
* †Metrobates
** †Metrobates aeternalis – type locality for species
* Life restoration of the Paleocene-Eocene mammal Miacis †Miacis
** †Miacis edax
** †Miacis exiguus
** †Miacis latidens
** †Miacis parvivorus
** †Miacis vorax
* Miagrammopes
* †Mianeuretus – type locality for genus
** †Mianeuretus eocenicus – type locality for species
** †Mianeuretus mirabilis – type locality for species
* †Michenia
* †Microgaster
** †Microgaster primordialis – type locality for species
* †Microplitis
** †Microplitis vesperus – type locality for species
* †Microrhagus
** †Microrhagus fossilis – type locality for species
** †Microrhagus miocenicus – type locality for species
** †Microrhagus vulcanicus – type locality for species
* †Microstylum
** †Microstylum destructum – type locality for species
** †Microstylum wheeleri – type locality for species
* †Microsyops
** †Microsyops angustidens
** †Microsyops annectens
** †Microsyops elegans
** †Microsyops knightensis
** †Microsyops latidens
** †Microsyops scottianus
* †Microtomarctus
** †Microtomarctus conferta
* Microtus
** A living Microtus californicus, or California vole †Microtus californicus – or unidentified comparable form
** †Microtus longicaudus
** †Microtus meadensis
** †Microtus ochrogaster
** †Microtus paroperarius
* Mictomys
** †Mictomys meltoni
** †Mictomys vetus
* †Mimomys
** †Mimomys virginianus
* †Mimoperadectes
** †Mimoperadectes labrus
* †Mimosites
** †Mimosites coloradensis
* †Mimotricentes
** †Mimotricentes ischyrus – type locality for species
* †Mindarus – type locality for genus
** †Mindarus recurvus – type locality for species
** †Mindarus scudderi – type locality for species
* Life restoration of the Eocene-Oligocene oreodont mammal Miniochoerus †Miniochoerus
** †Miniochoerus gracilis
* †Miocaenia – type locality for genus
** †Miocaenia pectinicornis – type locality for species
* †Miocitta – type locality for genus
** †Miocitta galbreathi – type locality for species
* †Miocoris – type locality for genus
** †Miocoris fagi – type locality for species
* †Miocyphon – type locality for genus
** †Miocyphon punctulatus – type locality for species
* †Miodytiscus – type locality for genus
** †Miodytiscus hirtipes – type locality for species
* †Miogeraeus – type locality for genus
** †Miogeraeus recurrens – type locality for species
* Fossilized skull of the Eocene-Oligocene three-toed horse Miohippus †Miohippus
** †Miohippus obliquidens
* †Miolabis
** †Miolabis longiceps
* †Miolachnosterna – type locality for genus
** †Miolachnosterna tristoides – type locality for species
* †Miolithocharis – type locality for genus
** †Miolithocharis lithographica – type locality for species
* †Miomyrmex
** †Miomyrmex impactus – type locality for species
** †Miomyrmex striatus – type locality for species
* †Miophenolia – type locality for genus
** †Miophenolia cilipes – type locality for species
* †Miopodagrion
** †Miopodagrion optimum – type locality for species
* †Miosilpha – type locality for genus
** †Miosilpha necrophiloides – type locality for species
* †Miospermophilus
** †Miospermophilus bryanti
* †Miostenosis – type locality for genus
** †Miostenosis lacordairei – type locality for species
* Restoration of the Pliocene-Pleistocene Miracinonyx, or American cheetah †Miracinonyx
** †Miracinonyx inexpectatus – or unidentified comparable form
** †Miracinonyx studeri
* †Mischoserphus
** †Mischoserphus bruesi – type locality for species
* †Mitostylus
** †Mitostylus abacus – type locality for species
** †Mitostylus obdurefactus – type locality for species
* †Monocrepidius
** †Monocrepidius dubiosus – type locality for species
* †Monophlebus
** †Monophlebus simplex – type locality for species
* †Monosaulax
** †Monosaulax curtus
* 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 protogaea – type locality for species
** †Mordellistena scudderiana – type locality for species
** †Mordellistena smithiana – type locality for species
* †Moropus
** †Moropus elatus – or unidentified comparable form
* Morus
** †Morus symmetrica
* †Moyamyia – type locality for genus
** †Moyamyia limigena – type locality for species
* Musca
** †Musca vinculata – type locality for species
* Mustela
** †Mustela richardsonii
** †Mustela nigripes
* †Myas
** †Myas rigefactus – type locality for species
** †Myas umbrarum – type locality for species
* †Mycetaulus
** †Mycetaulus incretus – type locality for species
* †Mycetophagus
** †Mycetophagus exterminatus – type locality for species
** †Mycetophagus willistoni – type locality for species
* †Mycetophila
** †Mycetophila bradenae – type locality for species
** †Mycetophila occultata – type locality for species
* Mycetoporus
** †Mycetoporus demersus – type locality for species
* †Mycomya
** †Mycomya cockerelli – type locality for species
** †Mycomya lithomendax – type locality for species
* †Mydas
** †Mydas miocenicus – type locality for species
* Fruit of a living Myrica, or firetree Myrica
** †Myrica drymeja
* †Myrmecites – type locality for genus
** †Myrmecites rotundiceps – type locality for species
* Myrmica
** †Myrmica lobifrons
* †Myrtophyllum
** †Myrtophyllum torreyi
* †Mystipterus
** †Mystipterus martini
* †Mytonomys
** †Mytonomys coloradensis

## N

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Najadopsis
** †Najadopsis rugulosa
* †Nannodectes
** †Nannodectes gazini
** †Nannodectes gidleyi
** †Nannodectes simpsoni
* †Nanodelphys
** †Nanodelphys hunti
* †Nanthacia
** †Nanthacia torpida – type locality for species
* †Navajovius
** †Navajovius kohlhaasae – type locality for species
* A living Nebria ground beetle Nebria
** †Nebria occlusa – type locality for species
* †Nebritus
** †Nebritus willistoni – type locality for species
* †Necrobia
** †Necrobia divinatoria – type locality for species
** †Necrobia sibylla – type locality for species
* †Necrochromus – type locality for genus
** †Necrochromus cockerelli – type locality for species
** †Necrochromus labatus – type locality for species
** †Necrochromus saxificus – type locality for species
* †Necrocydnus – type locality for genus
** †Necrocydnus amyzonus – type locality for species
** †Necrocydnus revectus – type locality for species
** †Necrocydnus senior – type locality for species
** †Necrocydnus solidatus – type locality for species
** †Necrocydnus stygius – type locality for species
** †Necrocydnus torpens – type locality for species
** †Necrocydnus vulcanius – type locality for species
* †Necrodes
** †Necrodes primaevus – type locality for species
* †Necropsylla – type locality for genus
** †Necropsylla rigida – type locality for species
** †Necropsylla rigidula – type locality for species
* †Nelumbium
** †Nelumbium tenuifolium
* †Nemognatha
** †Nemognatha exsecta – type locality for species
* Neohypnus
* Neogale
** †Neogale frenata
** †Neogale vison
* †Neoliotomus
** †Neoliotomus conventus
** †Neoliotomus ultimus
* Neoptochus – tentative report
* †Neorhynchocephalus
** †Neorhynchocephalus melanderi – type locality for species
** †Neorhynchocephalus occultator – type locality for species
** †Neorhynchocephalus vulcanicus – type locality for species
* Neotoma
** †Neotoma cinerea
** †Neotoma ozarkensis
* †Nepa
** †Nepa vulcanica – type locality for species
* A living Nephila, or golden silk orb-weaver †Nephila
** †Nephila pennatipes – type locality for species
* †Netelia
** †Netelia memorialis – type locality for species
* †Neurodromicus – type locality for genus
** †Neurodromicus dorsalis – type locality for species
* †Nicocles
** †Nicocles miocenicus – type locality for species
* †Niptomomys
** †Niptomomys doreenae – type locality for species
* Nitidotachinus
** †Nitidotachinus lanei
* Nitidula
** †Nitidula prior – type locality for species
* †Nordenskioldia
** †Nordenskioldia borealis
* †Nortonella – type locality for genus
** †Nortonella typica – type locality for species
* †Nosotetocus – type locality for genus
** †Nosotetocus debilis – type locality for species
** †Nosotetocus marcovi – type locality for species
** †Nosotetocus vespertinus – type locality for species
* Mounted fossilized skeleton of the Eocene primate Notharctus †Notharctus
** †Notharctus robinsoni
** †Notharctus robustior
* †Nothopus
** †Nothopus kingii – type locality for species
* †Nothoserphus
** †Nothoserphus rasnitsyni – type locality for species
* Notonecta
** †Notonecta binuda – type locality for species
** †Notonecta emersoni – type locality for species
* †Notoparamys
** †Notoparamys arctios – type locality for species
** †Notoparamys costilloi
* Numenius
** †Numenius madagascariensis
* †Numitor – type locality for genus
** †Numitor claviger – type locality for species
* †Nyctea
** †Nyctea scandiaca
* †Nyctitherium
** †Nyctitherium velox – or unidentified comparable form
* †Nyktalos – type locality for genus
** †Nyktalos uhleri – type locality for species
** †Nyktalos vigil – type locality for species
* Flower of a living Nymphaea Nymphaea
** †Nymphaea leei
** †Nymphaea pulchella
* †Nymphalites – type locality for genus
** †Nymphalites obscurus – type locality for species
** †Nymphalites scudderi – type locality for species
* Nysius
** †Nysius stratus – type locality for species
** †Nysius terrae – type locality for species
** †Nysius tritus – type locality for species
** †Nysius vecula – type locality for species
** †Nysius vinctus – type locality for species
* †Nyssa
** †Nyssa alata
** †Nyssa obovata

## O

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Ochotona
** †Ochotona princeps
* †Ocymoromelitta – type locality for genus
** †Ocymoromelitta florissantella – type locality for species
** †Ocymoromelitta miocenica – type locality for species
** †Ocymoromelitta sorella – type locality for species
* †Odaxosaurus – or unidentified comparable form
** †Odaxosaurus piger
* Odocoileus
** Living male (right) and female (left) Odocoileus hemionus, or mule deer. †Odocoileus hemionus
* †Odynerus
** †Odynerus palaeophilus – type locality for species
** †Odynerus percontusus – type locality for species
** †Odynerus praesepultus – type locality for species
** †Odynerus terryi – type locality for species
** †Odynerus wilmattae – type locality for species
* †Oedipoda
** †Oedipoda praefocata – type locality for species
* †Ogygoptynx – type locality for genus
** †Ogygoptynx wetmorei – type locality for species
* †Olbiogaster
** †Olbiogaster simplex – type locality for species
* †Oligaeschna
** †Oligaeschna lapidaria – type locality for species
** †Oligaeschna separata – type locality for species
* †Oligoaeschna – type locality for genus
** †Oligoaeschna needhami – type locality for species
* †Oligobruchus
** †Oligobruchus florissantensis – type locality for species
** †Oligobruchus haywardi – type locality for species
** †Oligobruchus primoticus – type locality for species
** †Oligobruchus scudderi – type locality for species
** †Oligobruchus submersus – type locality for species
** †Oligobruchus wilsoni – type locality for species
* †Oligocryptus – type locality for genus
** †Oligocryptus sectus – type locality for species
* †Oligodonta – type locality for genus
** †Oligodonta florissantensis – type locality for species
* Illustration of a living Oligomerus death-watch beetle †Oligomerus
** †Oligomerus breviusculus – type locality for species
** †Oligomerus duratus – type locality for species
** †Oligomerus florissantensis – type locality for species
* †Oligomyotis
** †Oligomyotis casementi
* †Oligoneuroides – type locality for genus
** †Oligoneuroides destructus – type locality for species
* †Oligoryctes
* †Oligoscalops
** †Oligoscalops galbreathi
* †Oligotricha
** †Oligotricha evanescens – type locality for species
* †Ologlyptus
** †Ologlyptus primus – type locality for species
* Olophrum
** †Olophrum boreale
** †Olophrum obtectum
* Omalium
** †Omalium antiquorum – type locality for species
* †Omileus
** †Omileus evanidus – type locality for species
* †Omomys
** †Omomys carteri
* Omus
** †Omus audouini
* A living Ondatra, or muskrat Ondatra
** †Ondatra annectens
* †Oodectes
** †Oodectes herpestoides
* Ophisaurus
* Ophryastes
** †Ophryastes championi
** †Ophryastes grandis – type locality for species
** †Ophryastes petrarum
* †Ophryastites
** †Ophryastites absconsus – type locality for species
** †Ophryastites cinereus – type locality for species
** †Ophryastites dispertitus – type locality for species
** †Ophryastites hendersoni – type locality for species
** †Ophryastites miocenus – type locality for species
* †Ophyra
** †Ophyra vetusta – type locality for species
* †Opisthotriton
** †Opisthotriton kayi – or unidentified comparable form
* †Orchelimum
** †Orchelimum placidum – type locality for species
* Orchestes
** †Orchestes languidulus – type locality for species
* Oreamnos – or unidentified comparable form
** A living Oreamnos harringtoni, or Harrington's mountain goat †Oreamnos harringtoni
* †Oreolagus
** †Oreolagus wilsoni – type locality for species
* †Oreopanax
** †Oreopanax dissecta
** †Oreopanax elongatum – type locality for species
* †Oreotalpa – type locality for genus
** †Oreotalpa florissantensis – type locality for species
* †Ormyrodes
** †Ormyrodes petrefactus – type locality for species
* †Orohippus
** †Orohippus sylvaticus
* †Oromeryx
* A living Orontium, or golden-club †Orontium
** †Orontium fossile
* †Orphilus
** †Orphilus dubius
* †Orthocentrus
** †Orthocentrus defossus – type locality for species
** †Orthocentrus primus – type locality for species
* †Orthriocorisa – type locality for genus
** †Orthriocorisa longipes – type locality for species
* †Oryctogma – type locality for genus
** †Oryctogma sackenii – type locality for species
* †Oryctorhinus – type locality for genus
** †Oryctorhinus tenuirostris – type locality for species
* †Oryctoscirtetes – type locality for genus
** †Oryctoscirtetes protogaeum – type locality for species
* †Osmanthus
** †Osmanthus praemissa
* Living Osmunda ferns †Osmunda
** †Osmunda greenlandica
* †Osmylidia
** †Osmylidia requieta – type locality for species
* †Otiorhynchites
** †Otiorhynchites absentivus – type locality for species
** †Otiorhynchites commutatus – type locality for species
** †Otiorhynchites florissantensis – type locality for species
** †Otiorhynchites tysoni
* †Otiorhynchus
** †Otiorhynchus flaccus – type locality for species
** †Otiorhynchus subteractus – type locality for species
* Ovis
** †Ovis canadensis
* †Oxyacodon
** †Oxyacodon archibaldi – type locality for species
* Life restoration of the Paleocene-Eocene creodont mammal Oxyaena †Oxyaena
** †Oxyaena forcipata
** †Oxyaena gulo
** †Oxyaena intermedia
** †Oxyaena lupina – or unidentified comparable form
** †Oxyaena pardalis – or unidentified comparable form
* †Oxycera
** †Oxycera contusa – type locality for species
* †Oxyclaenus
** †Oxyclaenus cuspidatus – or unidentified comparable form
** †Oxyclaenus subbituminus – type locality for species
* †Oxygonus
** †Oxygonus primus – type locality for species
* †Oxyomus
** †Oxyomus nearcticus – type locality for species
* †Oxyprimus
** †Oxyprimus galadrielae – or unidentified comparable form
* †Oxyserphus
** †Oxyserphus exhumatus – type locality for species
* Oxytelus
** †Oxytelus laqueatus
** †Oxytelus pristinus – type locality for species
** †Oxytelus subapterus – type locality for species

## P

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Fossilized mandibles of the Paleocene-Eocene mesonychian mammal Pachyaena †Pachyaena
** †Pachyaena ossifraga – tentative report
* †Pachybaris
** †Pachybaris rudis – type locality for species
* †Pachylobius
** †Pachylobius compressus
** †Pachylobius depraedatus – type locality for species
* †Pachysomites – type locality for genus
** †Pachysomites inermis – type locality for species
* †Pachysystropus – type locality for genus
** †Pachysystropus condemnatus – type locality for species
** †Pachysystropus rohweri – type locality for species
* †Pactopus
** †Pactopus americanus – type locality for species
* A living Paederus rove beetle †Paederus
** †Paederus adumbratus – type locality for species
* †Paladicella – type locality for genus
** †Paladicella eruptionis – type locality for species
* †Palaeictops
** †Palaeictops bicuspis
** †Palaeictops multicuspis
* †Palaeobittacus – type locality for genus
** †Palaeobittacus eocenicus – type locality for species
* †Palaeochrysa – type locality for genus
** †Palaeochrysa concinnula – type locality for species
** †Palaeochrysa stricta – type locality for species
** †Palaeochrysa wickhami – type locality for species
* †Palaeocrex – type locality for genus
** †Palaeocrex fax – type locality for species
* †Palaeodrassus
** †Palaeodrassus cockerelli – type locality for species
** †Palaeodrassus florissanti – type locality for species
** †Palaeodrassus hesternus
** †Palaeodrassus interitus – type locality for species
* Illustration of a fossilized cranium of the Eocene-Miocene carnivoran mammal Palaeogale †Palaeogale
** †Palaeogale sectoria
* †Palaeogyps – type locality for genus
** †Palaeogyps prodromus – type locality for species
* †Palaeolagus
** †Palaeolagus burkei – type locality for species
** †Palaeolagus haydeni
** †Palaeolagus intermedius
* †Palaeometa
** †Palaeometa opertanea – type locality for species
* †Palaeonanophyes – type locality for genus
** †Palaeonanophyes zherikhini – type locality for species
* Fossilized partial skull of the Paleocene-Eocene creodont mammal Palaeonictis †Palaeonictis
** †Palaeonictis occidentalis
* †Palaeopachygnatha – type locality for genus
** †Palaeopachygnatha cockerelli – type locality for species
** †Palaeopachygnatha scudderi – type locality for species
* †Palaeopherocera
** †Palaeopherocera scudderi – type locality for species
* †Palaeoplatyura
** †Palaeoplatyura eocenica – type locality for species
* †Palaeopotamogeton
** †Palaeopotamogeton florissanti
* †Palaeorehnia – type locality for genus
** †Palaeorehnia maculata – type locality for species
* †Palaeoscincosaurus – type locality for genus
** †Palaeoscincosaurus middletoni – type locality for species
* †Palaeosinopa
** †Palaeosinopa incerta
* †Palaeosmodicum – type locality for genus
** †Palaeosmodicum hamiltoni – type locality for species
* †Palaeospiza
** †Palaeospiza bella
* Restorative model and fossilized skull of the Eocene brontothere mammal Palaeosyops †Palaeosyops – type locality for genus
** †Palaeosyops fontinalis – type locality for species
* †Palaeotaxonus – type locality for genus
** †Palaeotaxonus trivittatus – type locality for species
** †Palaeotaxonus typicus – type locality for species
** †Palaeotaxonus vetus – type locality for species
* †Palaeoteleia – type locality for genus
** †Palaeoteleia oxyura – type locality for species
* †Palaeotorymus
** †Palaeotorymus aciculatus – type locality for species
** †Palaeotorymus laevis – type locality for species
** †Palaeotorymus striatus – type locality for species
** †Palaeotorymus typicus – type locality for species
* †Palaeovelia – type locality for genus
** †Palaeovelia spinosa – type locality for species
* Fossil of the Eocene wasp Palaeovespa †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
* †Palaphrodes – type locality for genus
** †Palaphrodes cincta – type locality for species
** †Palaphrodes irregularis – type locality for species
** †Palaphrodes obliqua – type locality for species
** †Palaphrodes obscura – type locality for species
** †Palaphrodes transversa – type locality for species
* †Palatobaena
** †Palatobaena bairdi
* †Palecphora – type locality for genus
** †Palecphora communis – type locality for species
** †Palecphora inornata – type locality for species
** †Palecphora maculata – type locality for species
** †Palecphora marvinei – type locality for species
** †Palecphora praevalens – type locality for species
* †Paleocarcinophora
** †Paleocarcinophora lithophila – type locality for species
* †Paleoclinolabus
** †Paleoclinolabus dormitus – type locality for species
* †Palmites
* †Palmocarpon
** †Palmocarpon commune
** †Palmocarpon compositum
** †Palmocarpon lineatum
** †Palmocarpon subcylindricum
** †Palmocarpon truncatum
* †Paloedemera – type locality for genus
** †Paloedemera crassipes – type locality for species
* †Paloreodoxites
** †Paloreodoxites plicatus
* †Paltorhynchus
** †Paltorhynchus bisulcatus – type locality for species
** †Paltorhynchus depratus
** †Paltorhynchus narwhal
** †Paltorhynchus rectirostris – type locality for species
** †Paltorhynchus sedatus – type locality for species
* †Panax
** †Panax andrewsii
* †Pandeleteinus
** †Pandeleteinus nudus – type locality for species
* A living Panorpa scorpionfly †Panorpa
** †Panorpa arctiiformis – type locality for species
** †Panorpa rigida – type locality for species
* †Pantoclis
** †Pantoclis deperdita – type locality for species
* †Pantolestes
** †Pantolestes natans
* †Paracarpinus
** †Paracarpinus fraterna
* Paracosmus – type locality for genus
** †Paracosmus antiquus – type locality for species
** †Paracosmus coquilletti – type locality for species
** †Paracosmus palpalis – type locality for species
** †Paracosmus recurrens – type locality for species
* †Paracosoryx
* †Paracynarctus
** †Paracynarctus kelloggi
* †Paradjidaumo
** †Paradjidaumo trilophus
* †Paraglyptosaurus
** †Paraglyptosaurus princeps – type locality for species
* †Parahippus
** †Parahippus leonensis – or unidentified comparable form
** †Parahippus pawniensis – type locality for species
* †Parajulus
** †Parajulus cockerelli – type locality for species
* Fossilized skeleton of the Pliocene-Pleistocene ground sloth Paramylodon †Paramylodon
** †Paramylodon harlani
* †Paramys
** †Paramys copei
** †Paramys excavatus
** †Paramys relictus
** †Paramys taurus
* †Parandra
** †Parandra florissantensis – type locality for species
* †Parattus – type locality for genus
** †Parattus evocatus – type locality for species
** †Parattus latitatus – type locality for species
** †Parattus oculatus – type locality for species
** †Parattus resurrectus – type locality for species
* Fossilized partial skull and limb bone of the Eocene-Oligocene camel Paratylopus †Paratylopus
** †Paratylopus labiatus
* †Parectypodus
** †Parectypodus lunatus
* †Parictis
** †Parictis dakotensis
* †Parodarmistus – type locality for genus
** †Parodarmistus abscissus – type locality for species
** †Parodarmistus caducus – type locality for species
** †Parodarmistus collisus – type locality for species
** †Parodarmistus defectus – type locality for species
** †Parodarmistus exanimatus – type locality for species
** †Parodarmistus inhibitus – type locality for species
* †Parolamia – type locality for genus
** †Parolamia rudis – type locality for species
* †Parophisaurus – type locality for genus
** †Parophisaurus pawneensis – type locality for species
* †Parotermes – type locality for genus
** †Parotermes insignis – type locality for species
* †Parthenocissus
** †Parthenocissus osbornii
* †Parvericius
** †Parvericius montanus
* †Passaloecus
** †Passaloecus fasciatus – type locality for species
** †Passaloecus scudderi – type locality for species
* Life restoration of the Eocene creodont mammal Patriofelis. Charles R. Knight (1896). †Patriofelis
** †Patriofelis ulta
* †Paussopsis – type locality for genus
** †Paussopsis nearctica – type locality for species
** †Paussopsis secunda – type locality for species
* Pediacus
** †Pediacus periclitans – type locality for species
* Pekania
** †Pekania diluviana
* †Pelandrena – type locality for genus
** †Pelandrena reducta – type locality for species
* †Pellea
** †Pellea antiquella
* †Peltis
** †Peltis laminata – type locality for species
* Fossilized skull of the Eocene-Oligocene lizard Peltosaurus †Peltosaurus
** †Peltosaurus granulosus – type locality for species
* †Pelycodus
** †Pelycodus danielsae
** †Pelycodus jarrovii
* †Pelycomys
** †Pelycomys placidus
** †Pelycomys rugosus
* †Penetrigonias
** †Penetrigonias dakotensis
* †Penosphyllum
** †Penosphyllum cordatum
* †Pentatomites – type locality for genus
** †Pentatomites foliarum – type locality for species
* A living Penthetria march fly Penthetria – type locality for genus
** †Penthetria creedensis – type locality for species
** †Penthetria immutabilis – type locality for species
** †Penthetria intermedia – type locality for species
** †Penthetria longifurca – type locality for species
* †Pepsis
** †Pepsis avitula – type locality for species
* †Peraceras
** †Peraceras profectum
** †Peraceras superciliosum
* †Peradectes
** †Peradectes elegans – type locality for species
** †Peradectes protinnominatus – type locality for species
* Fossilized mandible of the Eocene-Miocene mammal Peratherium †Peratherium
** †Peratherium comstocki – or unidentified comparable form
* †Perchoerus
** †Perchoerus nanus
* †Periptychus
** †Periptychus coarctatus
* Peromyscus
** †Peromyscus cragini
** †Peromyscus maniculatus
** †Peromyscus progressus
* Persea
** †Persea brossiana
** †Persea florissantia – type locality for species
* Fossil of the Oligocene ant Petraeomyrmex †Petraeomyrmex – type locality for genus
** †Petraeomyrmex minimus – type locality for species
* †Petrolabis
** †Petrolabis gurneyi – type locality for species
* †Petrolestes – type locality for genus
** †Petrolestes hendersoni – type locality for species
* †Petrolystra – type locality for genus
** †Petrolystra gigantea – type locality for species
** †Petrolystra heros – type locality for species
* †Petrunkevitchiana
** †Petrunkevitchiana oculata – type locality for species
* †Phaca
** †Phaca wilmattae
* Phalacrocorax
** †Phalacrocorax mediterraneus
* Phalaropus
** †Phalaropus lobatus
* †Phaseolites
** †Phaseolites dedal – type locality for species
* †Phasmagyps – type locality for genus
** †Phasmagyps patritus – type locality for species
* Pheidole
** †Pheidole tertiaria – type locality for species
* †Phenacodaptes
** †Phenacodaptes sabulosus
* Life restoration of the Paleocene-Eocene ungulate Phenacodus. Charles R. Knight (1898). †Phenacodus
** †Phenacodus grangeri
** †Phenacodus intermedius
** †Phenacodus magnus
** †Phenacodus vortmani
* †Phenacolestes – type locality for genus
** †Phenacolestes mirandus – type locality for species
** †Phenacolestes parallelus – type locality for species
* Phenacomys
** †Phenacomys deeringensis
** †Phenacomys gryci – or unidentified comparable form
** †Phenacomys intermedius
* †Phenacoperga
** †Phenacoperga coloradensis – type locality for species
* †Phenacopsyche – type locality for genus
** †Phenacopsyche larvalis – type locality for species
** †Phenacopsyche vexans – type locality for species
* †Phenanthera
** †Phenanthera petalifera
* Flowers of a living Philadelphus, or mock-orange Philadelphus
** †Philadelphus minutus – type locality for species
* †Philanthus
** †Philanthus saxigenus – type locality for species
* Philhydrus
** †Philhydrus scudderi
* †Philonicus
** †Philonicus saxorum – type locality for species
* Philonthus
** †Philonthus abavus
** †Philonthus horni – type locality for species
** †Philonthus invelatus – type locality for species
** †Philonthus marcidulus – type locality for species
* †Philoponites
** †Philoponites praefractus – type locality for species
* †Philorites – type locality for genus
** †Philorites johannseni – type locality for species
** †Philorites pallescens – type locality for species
* Illustration of a fossilized skull in multiple views of the Oligocene-Miocene bone-crushing dog Phlaocyon †Phlaocyon
** †Phlaocyon leucosteus – type locality for species
* †Phloeonemites – type locality for genus
** †Phloeonemites miocenus – type locality for species
* Phloeosinus
** †Phloeosinus scopulorum
* Phloeotribus
** †Phloeotribus zimmermanni – type locality for species
* †Phora
** †Phora tumbae – type locality for species
* †Phrudopamera – type locality for genus
** †Phrudopamera chittendeni – type locality for species
** †Phrudopamera wilsoni – type locality for species
* Phryganea
** †Phryganea labefacta – type locality for species
** †Phryganea miocenica – type locality for species
** †Phryganea wickhami – type locality for species
* A living Phrynosoma douglasii, or pygmy short-horned lizard Phrynosoma
** †Phrynosoma douglassi
* †Phthinocoris – type locality for genus
** †Phthinocoris colligatus – type locality for species
** †Phthinocoris languidus – type locality for species
** †Phthinocoris lethargicus – type locality for species
** †Phthinocoris petraeus – type locality for species
* †Phylledestes – type locality for genus
** †Phylledestes vorax – type locality for species
* †Phyllites
** †Phyllites pagosensis
* †Phyllobaenus
** †Phyllobaenus wolcotti – type locality for species
* Phyllobius
** †Phyllobius antecessor – type locality for species
* A living Phyllophaga New World scarab †Phyllophaga
** †Phyllophaga avus
** †Phyllophaga disrupta – type locality for species
** †Phyllophaga extincta – type locality for species
* †Phymatodes
** †Phymatodes grandaevus – type locality for species
** †Phymatodes miocenicus – type locality for species
** †Phymatodes volans – type locality for species
* Pica
** †Pica hudsonia
* Picea
** †Picea lahontense
** †Picea magna – type locality for species
** †Picea pinifructus
* Picoides
** †Picoides villosus
* †Pidonia
** †Pidonia ingenua – type locality for species
** †Pidonia leidyi – type locality for species
* †Piesma – tentative report
** †Piesma rotunda – type locality for species
* †Piezocoris – type locality for genus
** †Piezocoris compactilis – type locality for species
** †Piezocoris peremptus – type locality for species
** †Piezocoris peritus – type locality for species
* A living Pimpla wasp †Pimpla
** †Pimpla appendigera – type locality for species
** †Pimpla eocenica – type locality for species
** †Pimpla morticina – type locality for species
** †Pimpla rediviva – type locality for species
** †Pimpla revelata – type locality for species
** †Pimpla senilis – type locality for species
* Pinus
** †Pinus florissanti
** †Pinus hambachi
** †Pinus wheeleri
* †Pipiza
** †Pipiza melanderi – type locality for species
* †Pison
** †Pison cockerellae – type locality for species
* Pituophis
** A living Pituophis melanoleucus, or pine snake †Pituophis melanoleucus
* Pityophthorus
** †Pityophthorus opaculus
* †Plagiopodiopsis
** †Plagiopodiopsis cockerelliae
** †Plagiopodiopsis scudderi
* †Planocephalus – type locality for genus
** †Planocephalus aselloides – type locality for species
* Planolinoides
** †Planolinoides duplex
* †Plastomenus – tentative report
** †Plastomenus lachrymalis
* †Platanites
** †Platanites marginata
* Leaves and fruit of a living Platanus, or plane tree Platanus
** †Platanus florissanti – type locality for species
** †Platanus nobilis
** †Platanus raynoldsi
** †Platanus raynoldsii
** †Platanus wyomingensis
* Plateumaris
** †Plateumaris flavipes
** †Plateumaris germari
** †Plateumaris primaeva – type locality for species
** †Plateumaris pusilla
* †Platycheirus
** †Platycheirus lethaeus – type locality for species
** †Platycheirus persistens – type locality for species
* Platydema
** †Platydema antiquorum – type locality for species
** †Platydema bethunei – type locality for species
* †Platydracus
** †Platydracus breviantennatus – type locality for species
* Restoration of a herd of alarmed Miocene-Pleistocene peccaries of the genus Platygonus. Charles R. Knight (1922). †Platygonus
** †Platygonus pollenae
* Platynus
** †Platynus florissantensis – type locality for species
** †Platynus insculptipennis – type locality for species
** †Platynus tartareus – type locality for species
* †Platypedia
** †Platypedia primigenia – type locality for species
* †Platyphylax
** †Platyphylax florissantensis – type locality for species
* Platystethus
** †Platystethus archetypus – type locality for species
** †Platystethus carcareus – type locality for species
* A pair of living Plecia march flies Plecia
** †Plecia akerionana
** †Plecia axeliana – type locality for species
** †Plecia decapitata – type locality for species
** †Plecia explanata – type locality for species
** †Plecia gradata – type locality for species
** †Plecia melanderi – type locality for species
** †Plecia orycta – type locality for species
** †Plecia rhodopterina – type locality for species
** †Plecia tessella – type locality for species
** †Plecia winchesteri – type locality for species
* †Plectiscidea
** †Plectiscidea lanhami – type locality for species
* †Plectrotetrophanes – type locality for genus
** †Plectrotetrophanes hageni – type locality for species
* †Plesiadapis
** †Plesiadapis dubius
** †Plesiadapis fodinatus
* †Plesiobaena
** †Plesiobaena antiqua – or unidentified comparable form
* †Plesiosorex
** †Plesiosorex coloradensis – type locality for species
* †Pleurolicus
* Fossilized skull of the Miocene horse Pliohippus †Pliohippus
** †Pliohippus mirabilis – type locality for species
* †Plionictis
** †Plionictis ogygia
* †Plochionus
** †Plochionus lesquereuxi – type locality for species
* †Poabromylus
* Podabrus
** †Podabrus cupesoides – type locality for species
** †Podabrus florissantensis – type locality for species
** †Podabrus fragmentatus – type locality for species
** †Podabrus wheeleri – type locality for species
* Podiceps
* Podilymbus
** †Podilymbus podiceps
* Life restoration of the Eocene-Oligocene camel Poebrotherium †Poebrotherium
** †Poebrotherium eximium
** †Poebrotherium wilsoni
* †Poecilocapsus
** †Poecilocapsus fremontii – type locality for species
** †Poecilocapsus ostentus – type locality for species
** †Poecilocapsus tabidus – type locality for species
** †Poecilocapsus veterandus – type locality for species
** †Poecilocapsus veternosus – type locality for species
* †Poecilognathus – type locality for genus
** †Poecilognathus stigmalis – type locality for species
* †Pogonomyrmex
** †Pogonomyrmex fossilis – type locality for species
* †Polemius
** †Polemius crassicornis – type locality for species
* †Poliocoris – type locality for genus
** †Poliocoris amnesis – type locality for species
* †Polioschistus – type locality for genus
** †Polioschistus lapidarius – type locality for species
** †Polioschistus ligatus – type locality for species
* †Poliosphageus – type locality for genus
** †Poliosphageus psychrus – type locality for species
* Polycentropus
** †Polycentropus aeternus – type locality for species
** †Polycentropus eviratus – type locality for species
** †Polycentropus exesus – type locality for species
* Polygraphus
** †Polygraphus rufipennis
** †Polygraphus wortheni – type locality for species
* †Polysphincta
** †Polysphincta inundata – type locality for species
** †Polysphincta mortuaria – type locality for species
** †Polysphincta petrorum – type locality for species
* †Polystoechotites
** †Polystoechotites piperatus – type locality for species
* †Ponerites – type locality for genus
** †Ponerites coloradensis – type locality for species
** †Ponerites eocenicus – type locality for species
** †Ponerites hypoponeroides – type locality for species
* †Populites
** †Populites heeri
* Populus
** †Populus cinnamomoides
** †Populus crassa
** †Populus pyrifolia
** †Populus wilmattae
* †Porizon
** †Porizon exsectus – type locality for species
* Porzana
** A living Porzana carolina, or sora †Porzana carolina
* †Potamogeton
** †Potamogeton geniculatus
** †Potamogeton verticillatus
* †Poteschistus – type locality for genus
** †Poteschistus obnubilus – type locality for species
* †Praepapilio – type locality for genus
** †Praepapilio colorado – type locality for species
** †Praepapilio gracilis – type locality for species
* †Priabona
** †Priabona florissantius – type locality for species
* †Prinecphora – type locality for genus
** †Prinecphora balteata – type locality for species
* †Pristaulacus – type locality for genus
** †Pristaulacus rohweri – type locality for species
** †Pristaulacus secundus – type locality for species
* †Pristichampsus
* †Proapemon – type locality for genus
** †Proapemon infernus – type locality for species
* †Probathyopsis
** †Probathyopsis harrisorum – type locality for species
* †Procas
** †Procas verberatus – type locality for species
** †Procas vinculatus
* †Procerberus
** †Procerberus andesiticus – type locality for species
** †Procerberus grandis – type locality for species
* †Prochaetocnema – type locality for genus
** †Prochaetocnema florissantella – type locality for species
* †Procoris – type locality for genus
** †Procoris bechleri – type locality for species
** †Procoris sanctaejohannis – type locality for species
* †Procrophius – type locality for genus
** †Procrophius communis – type locality for species
** †Procrophius costalis – type locality for species
** †Procrophius languens – type locality for species
* †Proctotrypes
** †Proctotrypes exhumatus – type locality for species
* †Procydnus – type locality for genus
** †Procydnus devictus – type locality for species
** †Procydnus divexus – type locality for species
** †Procydnus eatoni – type locality for species
** †Procydnus mamillanus
** †Procydnus pronus – type locality for species
** †Procydnus quietus – type locality for species
** †Procydnus reliquus – type locality for species
** †Procydnus vesperus – type locality for species
* †Procymus – type locality for genus
** †Procymus cockerelli – type locality for species
* †Prodeporaides
** †Prodeporaides laminarum – type locality for species
** †Prodeporaides subterraneus – type locality for species
** †Prodeporaides vulcan – type locality for species
** †Prodeporaides wymani – type locality for species
* †Prodeporaus
** †Prodeporaus curiosum – type locality for species
** †Prodeporaus exanimale – type locality for species
** †Prodeporaus exilis – type locality for species
** †Prodeporaus minutissimus – type locality for species
** †Prodeporaus smithii – type locality for species
* †Prodiacodon
** †Prodiacodon tauricinerei
* †Prodipodomys
** †Prodipodomys centralis
* Illustration of a fossil of the Eocene butterfly Prodryas †Prodryas – type locality for genus
** †Prodryas persephone – type locality for species
* †Proelectrotermes
** †Proelectrotermes fodinae – type locality for species
* †Progloma – type locality for genus
** †Progloma rohweri – type locality for species
* †Proheteromys
** †Proheteromys sulculus
* †Proiridomyrmex – type locality for genus
** †Proiridomyrmex vetulus – type locality for species
* †Prokalotermes
** †Prokalotermes hagenii – type locality for species
* †Prolibythea – type locality for genus
** †Prolibythea florissanti – type locality for species
** †Prolibythea vagabunda – type locality for species
* †Prolimnocyon
** †Prolimnocyon atavus
** †Prolimnocyon haematus
* †Prolygaeus – type locality for genus
** †Prolygaeus inundatus – type locality for species
* †Promioclaenus
** †Promioclaenus acolytus
* †Pronemobius
** †Pronemobius ornatipes – type locality for species
** †Pronemobius tertiarius – tentative report
* †Propalaeanodon
* †Prophilanthus – type locality for genus
** †Prophilanthus destructus – type locality for species
* †Proscalops
** †Proscalops miocaenus – type locality for species
** †Proscalops secundus – or unidentified comparable form
* †Prosigara – type locality for genus
** †Prosigara flabellum – type locality for species
* †Prosoeca – type locality for genus
** †Prosoeca florigera – type locality for species
* Prosopis
** †Prosopis linearfolia
* †Protacnaeus – type locality for genus
** †Protacnaeus tenuicornis – type locality for species
* †Protapate – type locality for genus
** †Protapate contorta – type locality for species
* Fossil of the Oligocene ant Protazteca †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
* †Proteleates – type locality for genus
** †Proteleates centralis – type locality for species
* †Protenor
** †Protenor imbecillis – type locality for species
* †Protictis
** †Protictis proteus
* †Protipochus – type locality for genus
** †Protipochus vandykei – type locality for species
* †Protochrysotoxum – type locality for genus
** †Protochrysotoxum sphinx – type locality for species
* †Protoedalea
** †Protoedalea brachystoma – type locality for species
* Fossilized skeleton of the Miocene horse Protohippus †Protohippus
* †Protoibalia
** †Protoibalia connexiva – type locality for species
* †Protolabis
** †Protolabis heterodontus
* †Protoliarus – type locality for genus
** †Protoliarus amabilis – type locality for species
** †Protoliarus humatus – type locality for species
* †Protomarctus
** †Protomarctus optatus
* †Protomelecta – type locality for genus
** †Protomelecta brevipennis – type locality for species
* †Protoncideres – type locality for genus
** †Protoncideres primus – type locality for species
* †Protoplatycera – type locality for genus
** †Protoplatycera laticornis – type locality for species
* †Protoreodon
* Protorohippus †Protorohippus
** †Protorohippus venticolum
* †Protospermophilus
** †Protospermophilus kelloggi
* †Protostephanus – type locality for genus
** †Protostephanus ashmeadi – type locality for species
* †Prototomus
** †Prototomus deimos
** †Prototomus martis
** †Prototomus phobos
** †Prototomus secundarius
* †Protungulatum
** †Protungulatum donnae
* Prunus
** †Prunus coloradensis
** †Prunus corrugis
** †Prunus gracilis
* †Psammaecius
** †Psammaecius sepultus – type locality for species
* †Psapharochus
** †Psapharochus lengii – type locality for species
* †Psephenus
** †Psephenus lutulentus – type locality for species
* Pseudacris
** †Pseudacris triseriata
* Restoration of the Miocene cat Pseudaelurus †Pseudaelurus
** †Pseudaelurus stouti
* †Pseudhipparion
* †Pseudocimbex – type locality for genus
** †Pseudocimbex clavatus – type locality for species
* †Pseudocylindrodon
** †Pseudocylindrodon neglectus – or unidentified comparable form
* †Pseudomesauletes
** †Pseudomesauletes culex – type locality for species
** †Pseudomesauletes ibis – type locality for species
** †Pseudomesauletes obliquus – type locality for species
** †Pseudomesauletes striaticeps – type locality for species
* Pseudomyrmex
** †Pseudomyrmex extinctus – type locality for species
* Fossilized skeleton of the Eocene protoceratid mammal Pseudoprotoceras †Pseudoprotoceras
** †Pseudoprotoceras longinaris
* †Pseudosiobla
** †Pseudosiobla megoura – type locality for species
** †Pseudosiobla misera – type locality for species
* †Pseudosmylidia – type locality for genus
** †Pseudosmylidia relicta – type locality for species
* †Pseudotetonius
** †Pseudotetonius ambiguus
* †Pseudotheridomys
** †Pseudotheridomys hesperus
* †Pseudotrimylus
** †Pseudotrimylus compressus
** †Pseudotrimylus roperi
* Life restoration of the Paleocene taeniodont mammal Psittacotherium multifragum †Psittacotherium
* Ptelea
** †Ptelea cassiodes
* Pterocarya
** †Pterocarya hispida
** †Pterocarya roanensis – type locality for species
* †Pterogaulus
** †Pterogaulus laevis
* †Pteromalus
** †Pteromalus exanimis – type locality for species
* †Pteromogoplistes
** †Pteromogoplistes grandis – type locality for species
** †Pteromogoplistes smithii – tentative report
* †Pteronus
** †Pteronus prodigus – type locality for species
* Pterostichus
** †Pterostichus pumpellyi – type locality for species
** †Pterostichus walcotti
* †Pterotriamescaptor – tentative report
** †Pterotriamescaptor americanus – type locality for species
* Illustration of a fossilized skull of the Paleocene multituberculate mammal Ptilodus †Ptilodus
** †Ptilodus kummae
* †Ptosima
** †Ptosima abyssa – type locality for species
** †Ptosima schaefferi – type locality for species
** †Ptosima silvatica – type locality for species
* †Ptychoptera
** †Ptychoptera miocenica – type locality for species
* †Pulverflumen
* Pycnoglypta
** †Pycnoglypta lurida
* †Pythoceropsis – type locality for genus
** †Pythoceropsis singularis – type locality for species

## Q

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Quadratomus
** †Quadratomus grandis
* Quedius
** †Quedius breweri – type locality for species
** †Quedius chamberlini – type locality for species
** †Quedius mortuus – type locality for species
* A living Quercus, or oak tree Quercus
** †Quercus balaninorum
** †Quercus dumosoides
** †Quercus greenlandica
** †Quercus knowltoniana
** †Quercus lyratiformis
** †Quercus mohavensis
** †Quercus orbata
** †Quercus perdayana – type locality for species
** †Quercus peritula
** †Quercus schottii
** †Quercus scottii
** †Quercus scudderi
** †Quercus sullyi

## R

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Rallus
** †Rallus limicola
* Life restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx. Robert Bruce Horsfall (1913). †Ramoceros
** †Ramoceros osborni
* †Rana
** †Rana catesbeiana
* †Raphidia
** †Raphidia creedei – type locality for species
* †Reichertella
** †Reichertella fasciata – type locality for species
* Reithrodontomys
* †Reithroparamys
** †Reithroparamys debequensis – type locality for species
* †Rembus – tentative report
** †Rembus henshawi – type locality for species
* Reticulitermes
** †Reticulitermes creedei – type locality for species
** †Reticulitermes fossarum – type locality for species
* Rhabdomastix
** †Rhabdomastix frigida – type locality for species
** †Rhabdomastix labefactata – type locality for species
** †Rhabdomastix praecursor – type locality for species
** †Rhabdomastix primogenitalis
** †Rhabdomastix profundi – type locality for species
** †Rhabdomastix scudderi – type locality for species
* †Rhadinobrochus
** †Rhadinobrochus extinctus – type locality for species
* A living Rhagio snipefly †Rhagio
** †Rhagio fossitius – type locality for species
** †Rhagio wheeleri – type locality for species
* †Rhagoderidea – type locality for genus
** †Rhagoderidea striata – type locality for species
* Rhagonycha
** †Rhagonycha hesperus – type locality for species
* †Rhamnites
** †Rhamnites pseudostenophyllus
* †Rhamnus
** †Rhamnus cleburni
** †Rhamnus goldiana
* A living Rhamphomyia dance fly †Rhamphomyia
** †Rhamphomyia aeterna – type locality for species
** †Rhamphomyia craterae – type locality for species
** †Rhamphomyia enena – type locality for species
** †Rhamphomyia fossa – type locality for species
** †Rhamphomyia hypolitha – type locality for species
** †Rhamphomyia inanimata – type locality for species
** †Rhamphomyia infernalis – type locality for species
** †Rhamphomyia interita – type locality for species
** †Rhamphomyia morticina – type locality for species
** †Rhamphomyia senecta – type locality for species
** †Rhamphomyia sepulta – type locality for species
** †Rhamphomyia spodites – type locality for species
** †Rhamphomyia tumulata – type locality for species
* †Rhepocoris – type locality for genus
** †Rhepocoris macrescens – type locality for species
** †Rhepocoris minima – type locality for species
** †Rhepocoris praetectus – type locality for species
** †Rhepocoris praevalens – type locality for species
** †Rhepocoris propinquans – type locality for species
* Rhineastes
** †Rhineastes peltatus
** †Rhineastes smithi
* A living Rhineura floridana, or North American worm lizard Rhineura
** †Rhineura hatcheri
** †Rhineura hatcherii – type locality for species
* †Rhingia
** †Rhingia zephyrea – type locality for species
* †Rhingiopsis
** †Rhingiopsis prisculus – type locality for species
* Rhizophagus
** †Rhizophagus remotus
* A Rhus nigricans leaf Rhus
** †Rhus lesquereuxi
** †Rhus migricans
** †Rhus nigricans
** †Rhus obscura
** †Rhus stellariaefolia
* †Rhyparochromus
** †Rhyparochromus verrillii – type locality for species
* †Rhysosternum
** †Rhysosternum aeternabile – type locality for species
** †Rhysosternum longirostre – type locality for species
* †Rhyssa
** †Rhyssa petiolata – type locality for species
* †Rhyssomatus
** †Rhyssomatus tabescens – type locality for species
* †Ribes
** †Ribes errans – type locality for species
* †Riodinella – type locality for genus
** †Riodinella nympha – type locality for species
* †Robinia
** †Robinia lesquereuxi
** †Robinia wardi
* †Rogas
** †Rogas tertiarius – type locality for species
* Rosa
** †Rosa hilliae
* A living Rothschildia moth †Rothschildia
** †Rothschildia fossilis – type locality for species
* Rubus
** †Rubus coloradensis
* †Runaria – type locality for genus
** †Runaria ostenta – type locality for species
* †Rupiforficula
** †Rupiforficula inferna – type locality for species
** †Rupiforficula labens – type locality for species
** †Rupiforficula scudderi – type locality for species

## S

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Living Sabal, or palmettos Sabal
** †Sabal grayana
** †Sabal imperialis
* †Saccoloma
** †Saccoloma gardneri
* †Sackenia – type locality for genus
** †Sackenia arcuata – type locality for species
* Salix
** †Salix coloradensis
** †Salix coloradica – type locality for species
** †Salix libbeyi
** †Salix longiacuminata
** †Salix longipetiolatum – or unidentified comparable form
** †Salix ramaleyi
** †Salix taxifolioides
* †Sambucus
** †Sambucus newtoni
* Fossilized skeleton of the Eocene monitor lizard Saniwa †Saniwa
* †Saperda
** †Saperda caroli – type locality for species
** †Saperda florissantensis – type locality for species
* †Saperdirhynchus – type locality for genus
** †Saperdirhynchus priscotitillator – type locality for species
* †Sapindus
** †Sapindus coloradensis
* †Sapromyza
** †Sapromyza veterana – type locality for species
* †Saropogon
** †Saropogon oblitescens – type locality for species
* Sassafras
** †Sassafras CR010 informal
** Fossilized leaf of the Eocene sassafras Sassafras hesperia †Sassafras hesperia
** †Sassafras thermale
* †Scalopoides
** †Scalopoides isodens
* Scaphinotus
** †Scaphinotus serus – type locality for species
* †Scaptolenopsis – type locality for genus
** †Scaptolenopsis wilmattae – type locality for species
* Sceloporus
** †Sceloporus undulatus
* †Scenopagus
** †Scenopagus edenensis
** †Scenopagus priscus
* †Schaubeumys
** †Schaubeumys clivosus
** †Schaubeumys galbreathi
* †Schmaltzia
** †Schmaltzia vexans
* †Sciabregma – type locality for genus
** †Sciabregma rugosa – type locality for species
** †Sciabregma tenuicornis – type locality for species
* Sciara
** †Sciara dormitans – type locality for species
** †Sciara florissantensis – type locality for species
** †Sciara requieta – type locality for species
** †Sciara sopora – type locality for species
* Sciomyza
** †Sciomyza florissantensis – type locality for species
** †Sciomyza manca
* †Sciophila
** †Sciophila mirandula – type locality for species
* †Sciuravus
* A living Sciurus squirrel Sciurus
* Scolytus
** †Scolytus piceae
* †Scoparidea – type locality for genus
** †Scoparidea nebulosa – type locality for species
* †Scottimus
** †Scottimus ambiguus
* †Scyphophorus
** †Scyphophorus fossionis – type locality for species
** †Scyphophorus laevis – type locality for species
** †Scyphophorus tertiarius – type locality for species
* †Scythropus
** †Scythropus somniculosus – type locality for species
* †Segestria
** †Segestria scudderi – type locality for species
** †Segestria secessa
* A living Selaginella, or spikemoss †Selaginella
** †Selaginella berthoudi
* †Selandria
** †Selandria sapindi – type locality for species
* †Semanotus
** †Semanotus puncticollis – type locality for species
* †Senoprosopis
** †Senoprosopis antiquus – type locality for species
** †Senoprosopis borealis – type locality for species
** †Senoprosopis eureka – type locality for species
** †Senoprosopis romeri – type locality for species
* Sequoia
** Fossilized branch fragment from a Sequoia affinis †Sequoia affinis
* Serica
** †Serica antediluviana – type locality for species
** †Serica cockerelli – type locality for species
* †Sespia
** †Sespia nitida
* †Setodes
** †Setodes abbreviata – type locality for species
** †Setodes portionalis – type locality for species
* †Sialia
* †Sibinia
** †Sibinia whitneyi – type locality for species
* †Sifrhippus
** †Sifrhippus grangeri
* †Sigaretta
** †Sigaretta florissantella – type locality for species
* Sigmodon
** †Sigmodon curtisi
** †Sigmodon minor
* †Silpha
** †Silpha beutenmuelleri – type locality for species
** †Silpha colorata – type locality for species
* †Silvius
** †Silvius merychippi – type locality for species
* Simplocaria
** †Simplocaria tessellata
* †Simpsonlemur
** †Simpsonlemur jepseni
* †Simpsonodus
** †Simpsonodus chacensis
* †Sinclairella
** †Sinclairella dakotensis
* Life restoration of the Paleocene mesonychid mammal Sinonyx (top) †Sinonyx – or unidentified comparable form
* †Siphlurites – type locality for genus
** †Siphlurites explanatus – type locality for species
* †Siphonophoroides – type locality for genus
** †Siphonophoroides antiqua – type locality for species
** †Siphonophoroides gillettei – type locality for species
** †Siphonophoroides lassa – type locality for species
** †Siphonophoroides pennatus – type locality for species
** †Siphonophoroides simplex – type locality for species
* Sitona
** †Sitona exitiorum – type locality for species
** †Sitona paginarum
* †Sitones
** †Sitones exitiorum
* Sitta
** †Sitta carolinensis
* †Smicrorhynchus
** †Smicrorhynchus macgeei
* †Smilax
** †Smilax labidurommae
* Mounted fossilized skeleton of the Eocene primate Smilodectes †Smilodectes
** †Smilodectes gracilis
** †Smilodectes mcgrewi
* †Solenopsites – type locality for genus
** †Solenopsites minutus – type locality for species
* Sonoma
** †Sonoma margemina
* Sorex
** †Sorex arcticus
** †Sorex hoyi
* †Sparganium
** †Sparganium antiquum
* Spea
** A living Spea bombifrons, or plains spadefoot toad †Spea bombifrons
* †Spermophagus
** †Spermophagus pluto – type locality for species
** †Spermophagus vivificatus – type locality for species
* Spermophilus
** †Spermophilus elegans – or unidentified comparable form
** †Spermophilus lateralis
** †Spermophilus richardsonii
** †Spermophilus tridecemlineatus
* †Sphegina
** †Sphegina obscura – type locality for species
* Life restoration of the Eocene brontothere mammal Sphenocoelus †Sphenocoelus
** †Sphenocoelus uintensis
* †Spiladomyia – type locality for genus
** †Spiladomyia simplex – type locality for species
* †Spiladopygia
** †Spiladopygia exsulata – type locality for species
** †Spiladopygia mortalis – type locality for species
* Spilogale
** †Spilogale putorius
* †Spiniphora
** †Spiniphora cockerelli – type locality for species
* Spizella
** A living Spizella breweri, or Brewer's sparrow †Spizella breweri
* †Spodotribus – type locality for genus
** †Spodotribus terrulentus – type locality for species
* †Staphylea
** †Staphylea acuminata
** †Staphylea minutidens
* Staphylinus
** †Staphylinus lesleyi
** †Staphylinus vetulus – type locality for species
** †Staphylinus vulcan – type locality for species
* †Steganus – type locality for genus
** †Steganus barrandei – type locality for species
* †Stenoechinus
** †Stenoechinus tantalus
* †Stenogomphus – type locality for genus
** †Stenogomphus carletoni – type locality for species
* A living Stenolophus ground beetle †Stenolophus
** †Stenolophus religatus – type locality for species
* †Stenopamera – type locality for genus
** †Stenopamera subterrea – type locality for species
** †Stenopamera tenebrosa – type locality for species
* †Stenosphenus
** †Stenosphenus pristinus – type locality for species
* †Stenovelia – type locality for genus
** †Stenovelia nigra – type locality for species
* Stenus
** †Stenus morsei – type locality for species
* Ripe fruit capsule and seeds of a living Sterculia, or tropical chestnut Sterculia
** †Sterculia rigida
* †Sterictiphora
** †Sterictiphora konowi – type locality for species
* †Stibarus
** †Stibarus obtusilobus
** †Stibarus quadricuspis
* Stilbus
** †Stilbus pallidus
* †Stipa
** †Stipa florissanti
* †Stolopsyche – type locality for genus
** †Stolopsyche libytheoides – type locality for species
* †Strategus
** †Strategus cessatus – type locality for species
* †Stratimus
** †Stratimus strobeli
* †Striaderes – type locality for genus
** †Striaderes conradi – type locality for species
* †Strigorhysis
** †Strigorhysis huerfanensis – type locality for species
* †Stygiochelys
** †Stygiochelys estesi
* †Stylinodon
** †Stylinodon mirus
* Life restoration of the Eocene-Oligocene cow-sized rhinoceros Subhyracodon. Charles R. Knight (1890s). †Subhyracodon
** †Subhyracodon mitis – type locality for species
** †Subhyracodon occidentalis
* †Submeryceros
** †Submeryceros minor
* Sylvilagus
** †Sylvilagus audubonii
* †Symphoromyia
** †Symphoromyia subtrita – type locality for species
* †Synchroa
** †Synchroa quiescens – type locality for species
* †Syntomostylus
** †Syntomostylus rudis
* Syrphus
** †Syrphus aphidopsidis – type locality for species
** †Syrphus carpenteri – type locality for species
** †Syrphus eocenicus – type locality for species
** †Syrphus hendersoni – type locality for species
** †Syrphus lithaphidis – type locality for species
** †Syrphus petrographicus – type locality for species
** †Syrphus platychiralis – type locality for species
** †Syrphus willistoni – type locality for species
* †Systena
** †Systena florissantensis – type locality for species

## T

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Tabanus
** †Tabanus hipparionis – type locality for species
** †Tabanus parahippi – type locality for species
* Tachinus
** †Tachinus angustatus
** †Tachinus elongatus
** †Tachinus fimbriatus
** †Tachinus schwarzi
** †Tachinus sommatus – type locality for species
* Tachycineta
** A living Tachycineta bicolor, or tree swallow †Tachycineta bicolor
* †Tachypeza
** †Tachypeza primitiva – type locality for species
* Tachyporus
** †Tachyporus annosus – type locality for species
** †Tachyporus nimbicola
* †Tachys
** †Tachys haywardi – type locality for species
* †Taeniopodites – type locality for genus
** †Taeniopodites pardalis – type locality for species
* †Taeniurites – type locality for genus
** †Taeniurites fortis – type locality for species
* †Tagalodes – type locality for genus
** †Tagalodes inermis – type locality for species
* †Talpavus
* Tamiasciurus
** A living Tamiasciurus hudsonicus, or American red squirrel †Tamiasciurus hudsonicus
* Tanysphyrus
** †Tanysphyrus lemnae
* †Taphacris – type locality for genus
** †Taphacris bittaciformis – type locality for species
** †Taphacris reliquata – type locality for species
* †Tapholyda
** †Tapholyda caplani – type locality for species
* Tapirus
** †Tapirus haysii
* †Taracticus
** †Taracticus contusus – type locality for species
** †Taracticus hypogaeus – type locality for species
** †Taracticus renovatus – type locality for species
* Taxidea
** †Taxidea taxus
* †Teilhardina
* Restoration of the Miocene-Pliocene rhinoceros Teleoceras †Teleoceras
** †Teleoceras americanum – type locality for species
** †Teleoceras hicksi
** †Teleoceras medicornutum
* †Teleocoris – type locality for genus
** †Teleocoris pothetias – type locality for species
* †Teleoschistus
** †Teleoschistus placatus – type locality for species
** †Teleoschistus rigoratus – type locality for species
* †Tenebrionites
** †Tenebrionites alatus – type locality for species
* †Tenebroides
** †Tenebroides corrugata – type locality for species
* †Tenillus – type locality for genus
** †Tenillus firmus – type locality for species
* †Tenor – type locality for genus
** †Tenor speluncae – type locality for species
* †Tenthredella
** †Tenthredella fenestralis – type locality for species
** †Tenthredella oblita – type locality for species
** †Tenthredella toddi – type locality for species
* A living Tenthredo sawfly †Tenthredo
** †Tenthredo avia – type locality for species
** †Tenthredo infossa – type locality for species
** †Tenthredo saxorum – type locality for species
** †Tenthredo submersa – type locality for species
* †Teretrum
** †Teretrum primulum – type locality for species
* †Tethneus
** †Tethneus guyoti
** †Tethneus hentzi – type locality for species
** †Tethneus obduratus – type locality for species
** †Tethneus provectus – type locality for species
** †Tethneus robustus – type locality for species
** †Tethneus twenhofeli – type locality for species
* †Tetigonia
** †Tetigonia obtecta – type locality for species
** †Tetigonia priscotincta – type locality for species
* †Tetonius
** †Tetonius matthewi
** †Tetonius mckennai – type locality for species
* A living Tetragnatha spider †Tetragnatha
** †Tetragnatha tertiaria – type locality for species
* †Tetragoneura
** †Tetragoneura peritula – type locality for species
* †Tetraonyx
** †Tetraonyx minuscula – type locality for species
* †Tetraopes
** †Tetraopes submersus – type locality for species
* †Tetrapus
** †Tetrapus mayri – type locality for species
* Tetratoma
** †Tetratoma concolor
* †Tettoraptor – type locality for genus
** †Tettoraptor maculatus – type locality for species
* †Texasophis
** †Texasophis fossilis
** †Texasophis galbreathi – type locality for species
* †Texoceros
** †Texoceros vaughani – type locality for species
* Thamnophis
** †Thamnophis elegans
** A living Thamnophis sirtalis, or common garter snake †Thamnophis sirtalis
* †Thamnotettix
** †Thamnotettix eocenicus – type locality for species
** †Thamnotettix fundi – type locality for species
** †Thamnotettix packardi – type locality for species
* †Thanasimus
** †Thanasimus florissantensis – type locality for species
* Thanatophilus
** †Thanatophilus coloradensis
* †Thaumastocladius – type locality for genus
** †Thaumastocladius simplex – type locality for species
* A living Themira black scavenger fly †Themira
** †Themira saxifica – type locality for species
* †Theronia
** †Theronia wickhami – type locality for species
* †Thisbemys
** †Thisbemys elachistos
** †Thisbemys perditus – type locality for species
* †Thlibomenus – type locality for genus
** †Thlibomenus limosus – type locality for species
** †Thlibomenus macer – type locality for species
** †Thlibomenus parvus – type locality for species
** †Thlibomenus perennatus – type locality for species
** †Thlibomenus petreus – type locality for species
* †Thlimmoschistus – type locality for genus
** †Thlimmoschistus gravidatus – type locality for species
* †Thnetoschistus – type locality for genus
** †Thnetoschistus revulsus – type locality for species
* A living Thomisus crab spider †Thomisus
** †Thomisus defossus – type locality for species
** †Thomisus disjunctus – type locality for species
** †Thomisus resutus – type locality for species
* Thomomys
** †Thomomys talpoides
* †Thouinia
** †Thouinia straciata
* †Thryptacodon
** †Thryptacodon antiquus
** †Thryptacodon australis – type locality for species
* †Thuja
** †Thuja interrupta
* †Thylacodon
** †Thylacodon montanensis
** †Thylacodon pusillus
* Fossilized skull of the Miocene oreodont mammal Ticholeptus †Ticholeptus
* Tilia
** †Tilia populifolia
* †Tillomys
** †Tillomys senex – or unidentified comparable form
* †Tingis
** †Tingis florissantensis – type locality for species
* †Tinodes – tentative report
** †Tinodes paludigena – type locality for species
* Tipula – type locality for genus
** †Tipula bilineata – type locality for species
** †Tipula carolinae – type locality for species
** †Tipula carpenteri – type locality for species
** †Tipula clauda
** †Tipula consumpta – type locality for species
** †Tipula evanitura
** †Tipula florissanta
** †Tipula fmartinbrowni – type locality for species
** †Tipula heilprini – type locality for species
** †Tipula hepialina – type locality for species
** †Tipula internecata
** †Tipula lapillescens – type locality for species
** †Tipula lethaea – type locality for species
** †Tipula limi
** †Tipula maclurei
** †Tipula magnifica – type locality for species
** †Tipula needhami – type locality for species
** †Tipula paludis – type locality for species
** †Tipula picta – type locality for species
** †Tipula reliquiae – type locality for species
** †Tipula revivificata – type locality for species
** †Tipula rigens
** †Tipula subterjacens – type locality for species
** †Tipula tartari – type locality for species
** †Tipula wilmatteae – type locality for species
* †Tipulidea
** †Tipulidea distincta
* †Tiromerus – type locality for genus
** †Tiromerus tabifluus – type locality for species
** †Tiromerus torpefactus – type locality for species
* †Tiroschistus – type locality for genus
** †Tiroschistus indurescens – type locality for species
* †Titanoeca
** †Titanoeca ingenua – type locality for species
* Life restoration of the Paleocene pantodont mammal Titanoides †Titanoides
** †Titanoides looki
** †Titanoides primaevus
* †Tithonomyia
** †Tithonomyia atra – type locality for species
* †Tomarctus
** †Tomarctus brevirostris – type locality for species
* †Tomoxia
** †Tomoxia inundata – type locality for species
* †Torreya
** †Torreya geometrorum
* †Tortricites
** †Tortricites destructus – type locality for species
* A living Tortrix moth †Tortrix
** †Tortrix florissantana – type locality for species
* †Torymus
** †Torymus sackeni – type locality for species
* †Toxorhynchus
** †Toxorhynchus arctus
** †Toxorhynchus confectum – type locality for species
** †Toxorhynchus corruptus – type locality for species
** †Toxorhynchus florissantensis – type locality for species
** †Toxorhynchus grandis – type locality for species
** †Toxorhynchus minusculus – type locality for species
** †Toxorhynchus oculatus – type locality for species
** †Toxorhynchus pumilum
** †Toxorhynchus refrenatum – type locality for species
** †Toxorhynchus reventus – type locality for species
** †Toxorhynchus scudderianum – type locality for species
* †Tracheliodes
** †Tracheliodes mortuellus – type locality for species
* †Trapezonotus
** †Trapezonotus exterminatus – type locality for species
** †Trapezonotus stygialis – type locality for species
* Illustration of a living Trechus ground beetle Trechus
** †Trechus fractus – type locality for species
* †Tribochrysa – type locality for genus
** †Tribochrysa firmata – type locality for species
** †Tribochrysa inequalis – type locality for species
* †Tricentes
** †Tricentes subtrigonus
* †Trichilia
** †Trichilia florissanti
* †Trichiosomites – type locality for genus
** †Trichiosomites obliviosus – type locality for species
* †Triga
** †Triga coeni – type locality for species
* †Trigonias
** †Trigonias osborni – type locality for species
* †Trigonorhinus
** †Trigonorhinus sordidus – type locality for species
* †Trigonoscuta
** †Trigonoscuta inventa – type locality for species
* †Triplax
** †Triplax diluviana – type locality for species
** †Triplax materna – type locality for species
** †Triplax petrefacta – type locality for species
** †Triplax submersa – type locality for species
* †Triplopus
** †Triplopus implicatus
* †Trirhabda
** †Trirhabda majuscula – type locality for species
** †Trirhabda megacephala – type locality for species
** †Trirhabda sepulta
* Life restoration of the Eocene creodont mammal Tritemnodon †Tritemnodon
** †Tritemnodon strenuus – or unidentified comparable form
* †Triumfetta
** †Triumfetta ovata – type locality for species
* Trixagus
** †Trixagus sericeus
* †Trixoscelis
** †Trixoscelis patefacta – type locality for species
* †Trogosus
** †Trogosus grangeri
* Trogoxylon
** †Trogoxylon parallelopipedum
* †Trogus
** †Trogus vetus – type locality for species
* †Tropideres
** †Tropideres vastatus – type locality for species
* †Tropisternus
** †Tropisternus limitatus – type locality for species
** †Tropisternus vanus – type locality for species
* Trox
** †Trox antiquus – type locality for species
* †Trypherus
** †Trypherus aboriginalis – type locality for species
* †Tryphon
** †Tryphon amasidis – type locality for species
** †Tryphon cadaver – type locality for species
** †Tryphon explanatum – type locality for species
** †Tryphon florissantensis – type locality for species
** †Tryphon lapideus – type locality for species
** †Tryphon peregrinus – type locality for species
** †Tryphon senex – type locality for species
* †Tychius
** †Tychius evolatus
** †Tychius ferox – type locality for species
** †Tychius secretus – type locality for species
* †Tylecomnus
** †Tylecomnus davisii – type locality for species
** †Tylecomnus pimploides – type locality for species
* †Tylocomnus
** †Tylocomnus creedensis – type locality for species
* Living Typha, or cattails Typha
** †Typha lesquereuxi
* †Tyrbula
** †Tyrbula russelli – type locality for species
** †Tyrbula scudderi – type locality for species

## U

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ubiquitoxylon – type locality for genus
** †Ubiquitoxylon raynoldsii – type locality for species
* †Uintacyon
** †Uintacyon asodes
** †Uintacyon massetericus – or unidentified comparable form
* †Uintanius
** †Uintanius rutherfurdi
* †Uintascorpio – type locality for genus
** †Uintascorpio halandrasorum – type locality for species
* A living Ulmus, or elm Ulmus
** †Ulmus rhamnifolia
** †Ulmus tenuinervis
* †Ulus
** †Ulus minutus – type locality for species
* Urocyon
** †Urocyon cinereoargenteus
* †Urolibellula – type locality for genus
** †Urolibellula eocenica – type locality for species
* †Urortalis
** †Urortalis caudatus – type locality for species
* †Urosigalphus
** †Urosigalphus aeternus – type locality for species
* †Ursavus
** †Ursavus pawniensis
* Ursus
** A living Ursus americanus, or American black bear †Ursus americanus
* †Ustatochoerus
** †Ustatochoerus medius
* †Utemylus
** †Utemylus latomius – type locality for species
** †Utemylus serior

## V

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Vanessa
** †Vanessa amerindica – type locality for species
* †Vauquelinia
** †Vauquelinia coloradensis
* †Verrallites – type locality for genus
** †Verrallites cladurus – type locality for species
* †Viburnum
** †Viburnum goldianum
** †Viburnum solitarium
* †Vicia
* †Villa – type locality for genus
** †Villa setosa – type locality for species
* Leaves and fruit of a living Vitis, or grapevine Vitis
** †Vitis lobata
** †Vitis olriki
* †Viverravus
** †Viverravus acutus
** †Viverravus gracilis
** †Viverravus lutosus
** †Viverravus minutus
** †Viverravus politus – or unidentified comparable form
** †Viverravus sicarius
* †Vrilletta
** †Vrilletta monstrosa – type locality for species
** †Vrilletta tenuistriata – type locality for species
* Mounted fossilized skeleton of the Eocene mammal Vulpavus †Vulpavus
** †Vulpavus australis – or unidentified comparable form
** †Vulpavus canavus
* Vulpes
** †Vulpes stenognathus
** †Vulpes velox
** †Vulpes vulpes

## W

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Washakius
** †Washakius izetti – or unidentified comparable form
* Flowers of a living Weinmannia †Weinmannia
** †Weinmannia phenacophylla
* †Wickia – type locality for genus
** †Wickia brevirhinus – type locality for species
* †Wilsoneumys
** †Wilsoneumys planidens
* †Wilsonosorex
** †Wilsonosorex conulatus
* †Woodwardia
** †Woodwardia arctica

## X

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* A living Xantholinus rove beetle †Xantholinus
** †Xantholinus tenebrarius – type locality for species
* †Xenacodon
** †Xenacodon mutilatus – type locality for species
* †Xenicohippus
** †Xenicohippus craspedotum
** †Xenicohippus grangeri
** †Xenicohippus osborni
* †Xenoberotha – type locality for genus
** †Xenoberotha angustialata – type locality for species
* †Xestobium
** †Xestobium alutaceum – type locality for species
* Xyela
** †Xyela florissantensis – type locality for species
* Xyleborinus
** †Xyleborinus saxeseni
* †Xyleborites – type locality for genus
** †Xyleborites longipennis – type locality for species
* †Xylobiops
** †Xylobiops lacustre – type locality for species
* A living Xylocopa, or carpenter bee †Xylocopa
** †Xylocopa gabrielae – type locality for species
* †Xylomya
** †Xylomya inornata – type locality for species
* †Xylomyia
** †Xylomyia moratula – type locality for species
* †Xylonomus
** †Xylonomus sejugatus – type locality for species
* †Xyronomys
** †Xyronomys robinsoni – type locality for species

## Y

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ylasoia
** †Ylasoia secunda – type locality for species
* †Yumaceras
** †Yumaceras figginsi

## Z

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Zacallites – type locality for genus
** †Zacallites balli – type locality for species
* A living Zamia cycad Zamia
** †Zamia coloradensis
* †Zanycteris – type locality for genus
** †Zanycteris honeyi – type locality for species
** †Zanycteris paleocenus – type locality for species
* Zelkova
** †Zelkova nervosa
** †Zelkova planeroides
* †Zetobora
** †Zetobora brunneri – type locality for species
* †Zingiberites
** †Zingiberites dubius
* Zizyphus
** †Zizyphus fibrillosus
** †Zizyphus florissanti
* Zonotrichia
** †Zonotrichia leucophrys
* †Zootermopsis
** †Zootermopsis coloradensis – type locality for species
* Known material diagram depicting the Miocene-Pleistocene mastodon relative Zygolophodon with a human to scale †Zygolophodon