List of the Mesozoic life of Utah

This list of the Mesozoic life of Utah contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Utah and are between 252.17 and 66 million years of age.

A
  • †Abrekopsis
    • †Abrekopsis depresispirus – type locality for species
  • †Abydosaurus – type locality for genus
    • †Abydosaurus mcintoshi – type locality for species
  • †Aclistochara
    • †Aclistochara bransoni
  • Fossilized skull of the Late Cretaceous duck-billed dinosaur Acristavus
    †Acristavus
    • †Acristavus gagslarsoni
  • †Adelodelphys
    • †Adelodelphys muizoni
  • †Adelolophus – type locality for genus
    • †Adelolophus hutchisoni – type locality for species
  • †Admetopsis
  • †Adocus
  • †Aenigmadelphys
    • †Aenigmadelphys archeri – type locality for species
  • Diagram illustrating the sizes of three specimens of the Late Cretaceous long-necked dinosaur Alamosaurus, with an anachronistic human to scale
    †Alamosaurus
    • †Alamosaurus sanjuanensis
  • †Albanerpeton
    • †Albanerpeton cifellii – type locality for species
    • †Albanerpeton galaktion
    • †Albanerpeton gracilis
    • †Albanerpeton nexuosus
  • †Aletridelphys
    • †Aletridelphys hatcheri
  • †Allocrioceras
    • †Allocrioceras annulatum
  • Life restoration of the Late Jurassic theropod dinosaur Allosaurus
    †Allosaurus
    • †Allosaurus fragilis
  • †Alphadon
    • †Alphadon attaragos
    • †Alphadon eatoni – type locality for species
    • †Alphadon halleyi
    • †Alphadon marshi – or unidentified comparable form
    • †Alphadon sahnii
  • †Alzadites
    • †Alzadites incomptus
  • †Amberleya – tentative report
  • †Amblotherium
    • †Amblotherium gracilis
  • †Ameribaatar – type locality for genus
    • †Ameribaatar zofiae – type locality for species
  • †Ameribataar
    • †Ameribataar zofiae
  • Amia
  • †Ampezzopleura
    • †Ampezzopleura rugosa – type locality for species
  • †Amplovalvata
  • †Anaflemingites
    • †Anaflemingites silberlingi – or unidentified related form
  • †Anasibirites
    • †Anasibirites angulosus
    • †Anasibirites bastini
    • †Anasibirites hircinus
    • †Anasibirites kingianus
    • †Anasibirites mojsisovicsi
    • †Anasibirites multiformis
    • †Anasibirites tenuistriatus
  • †Anawasatchites
  • †Anchisauripus
    • †Anchisauripus sillimani
  • †Anchistodelphys – type locality for genus
    • †Anchistodelphys archibaldi – type locality for species
    • †Anchistodelphys delicatus – type locality for species
  • †Anchura
  • †Anemia
    • †Anemia dakotensis
    • †Anemia dicksoniana
    • †Anemia fremontii
  • Mounted fossilized skeleton of the Cretaceous armored dinosaur Animantarx
    †Animantarx – type locality for genus
    • †Animantarx ramaljonesi – type locality for species
  • †Anisomyon
  • Anomia
  • †Anomoepus
  • †Apatopus
    • †Apatopus lineatus
  • †Apatosaurus
    • †Apatosaurus louisae – type locality for species
  • †Apistodon – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Apistodon exiguus – or unidentified related form
  • †Aquiladelphis – tentative report
    • †Aquiladelphis laurae – type locality for species
  • †Araeodon
    • †Araeodon intermissus
  • †Araucariacites
    • †Araucariacites australis
    • †Araucariacites fissus
  • Petrified trunk segments of the Permian-Late Triassic conifer tree Araucarioxylon arizonicum
    †Araucarioxylon
  • †Arcomya
  • †Arctoceras
    • †Arctoceras tuberculatum
  • †Arctoprionites
    • †Arctoprionites resseri
  • †Arvinachelys – type locality for genus
    • †Arvinachelys goldeni – type locality for species
  • †Aspenites
    • †Aspenites acutus
  • Astarte
    • †Astarte livingstonensis
    • †Astarte meeki
  • Fossil of the Ordovician-Modern sea star trace fossil ichnogenus Asteriacites
    Asteriacites
    • †Asteriacites lumbricalis
  • †Astralopteris
    • †Astralopteris coloradica
  • †Astroconodon
    • †Astroconodon delicatus – type locality for species
  • †Atreipus
    • †Atreipus milfordensis
  • †Aublysodon – tentative report
  • †Aucellina
  • †Austrotindaria
    • †Austrotindaria canalensis
    • †Austrotindaria svalbardensis
  • †Avitotherium – type locality for genus
    • †Avitotherium utahensis – type locality for species

B
  • †Baena
  • †Baibisha – or unidentified comparable form
  • †Bajarunia
    • †Bajarunia confusionensis – type locality for species
  • †Bakevellia
    • †Bakevellia costata
    • †Bakevellia costatus – or unidentified comparable form
    • †Bakevellia exporrecta
    • †Bakevellia silberlingi – type locality for species
  • Life reconstruction of an individual rearing up to defend itself against a pair of Allosaurus
    †Barosaurus
    • †Barosaurus lentus
  • †Basilemys
  • †Batrachopus
  • †Battenizyga
    • †Battenizyga eotriassica – type locality for species
  • †Bernissartia
  • †Bicuspidon – type locality for genus
    • †Bicuspidon numerosus – type locality for species
    • †Bicuspidon smikros – type locality for species
  • †Borissiakoceras
  • †Bothriagenys – type locality for genus
    • †Bothriagenys mysterion – type locality for species
  • Life restoration of the Late Cretaceous plesiosaur Brachauchenius hunting a hesperornithiform bird
    †Brachauchenius
    • †Brachauchenius lucasi
  • †Brachiosaurus
  • †Brachychirotherium
    • †Brachychirotherium thuringiacum
  • †Brachyphyllum
    • †Brachyphyllum crassicaule
  • †Brasilichnium
  • †Brontomerus – type locality for genus
    • †Brontomerus mcintoshi – type locality for species
  • †Brontopodus
  • Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus
    †Brontosaurus
    • †Brontosaurus parvus
  • †Brownichnus
    • †Brownichnus favosites – type locality for species
  • †Bryceomys
    • †Bryceomys fumosus – type locality for species
    • †Bryceomys hadrosus
    • †Bryceomys intermedius – type locality for species

C
  • †Callialasporites
    • †Callialasporites segmentatus
    • †Callialasporites turbatus
  • Callistina
    • †Callistina alta – or unidentified related form
  • †Calycoceras
    • †Calycoceras naviculare
  • Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus
    †Camarasaurus – type locality for genus
    • †Camarasaurus lentus – type locality for species
  • Campeloma
  • †Camptonectes
    • †Camptonectes platessiformis
    • †Camptonectes stygius
  • †Camptosaurus
    • †Camptosaurus dispar
  • †Cantioscyllium – or unidentified comparable form
  • †Carmelopodus – type locality for genus
    • †Carmelopodus untermannorum – type locality for species
  • †Carycorbula
    • †Carycorbula nematophora
  • †Cassiope
    • †Cassiope utahensis
  • †Cedaromys
    • †Cedaromys bestia – type locality for species
    • †Cedaromys hutchisoni – or unidentified comparable form
    • †Cedaromys minimus – type locality for species
    • †Cedaromys parvus – type locality for species
  • †Cedarosaurus – type locality for genus
    • †Cedarosaurus weiskopfae – type locality for species
  • †Cedarpelta – type locality for genus
    • †Cedarpelta bilbeyhallorum – type locality for species
  • †Cedrorestes – type locality for genus
    • †Cedrorestes crichtoni – type locality for species
  • †Cedroxylon
  • †Ceratodus
  • Restoration of the Late Jurassic ceratosaur Ceratosaurus
    †Ceratosaurus
    • †Ceratosaurus nasicornis
  • †Cercomya
    • †Cercomya punctata
  • †Cerebropollenites
    • †Cerebropollenites macroverruesus
  • Cerithiopsis
  • †Chamops
    • †Chamops segnis
  • †Characichnos
  • †Chartronella
    • †Chartronella pagina – type locality for species
    • †Chartronella unicostata – type locality for species
  • Restoration of the Late Triassic coelacanth fish Chinlea
    †Chinlea – type locality for genus
    • †Chinlea sorenseni – type locality for species
  • †Chirotherium
    • †Chirotherium rex – or unidentified comparable form
  • Chlamys
  • †Chondrites
  • †Churkites
    • †Churkites noblei
  • †Cimexomys
    • †Cimexomys antiquus – or unidentified comparable form
    • †Cimexomys gregoryi – type locality for species
  • †Cimolodon
    • †Cimolodon electus
    • †Cimolodon nitidus – or unidentified comparable form
    • †Cimolodon similis
    • †Cimolodon wardi – type locality for species
  • Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys
    †Cimolomys
    • †Cimolomys clarki
    • †Cimolomys milliensis – type locality for species
  • †Cionichthys – type locality for genus
    • †Cionichthys dunklei – type locality for species
  • Cladophlebis
    • †Cladophlebis constricta
    • †Cladophlebis parva
  • †Claraia
  • †Cnodontosaurus – type locality for genus
    • †Cnodontosaurus suchockii – type locality for species
  • †Coelophysis – tentative report
  • †Coelostylina
    • †Coelostylina angulifera – or unidentified comparable form
    • †Coelostylina costata – type locality for species
    • †Coelostylina virginensis – type locality for species
  • Life restoration of the Late Jurassic primmitive tyrannosaur Coelurus
    †Coelurus
    • †Coelurus fragilis
  • †Compsemys
  • †Confusionella
    • †Confusionella loczyi
  • †Coniophis
  • †Coniopteris
    • †Coniopteris hymenophylloides
  • †Contogenys
    • †Contogenys sloani – or unidentified comparable form
  • Corbula
  • †Cordillerites
    • †Cordillerites compressus
  • †Corviconodon
    • †Corviconodon utahensis – type locality for species
  • Cossmannea
    • †Cossmannea imayi
    • †Cossmannea imlayi
    • †Cossmannea kanabensis
  • †Costatoria
  • †Cowboyiceras – type locality for genus
    • †Cowboyiceras farwestense – type locality for species
  • †Cretorectolobus
  • †Crittendenia
  • †Ctenacodon
  • †Cteniogenys
  • †Ctenostreon
    • †Ctenostreon gikshanensis – or unidentified comparable form
  • Cucullaea
    • †Cucullaea haguei
  • †Culicolestes – type locality for genus
    • †Culicolestes kielanae – type locality for species
  • Fossil of the Jurassic-Cretaceous cycad relative Cycadeoidea
    †Cycadeoidea
    • †Cycadeoidea cleavelandii
    • †Cycadeoidea medullara
  • Cylichna
  • †Cylindrobullina
    • †Cylindrobullina convexa – type locality for species
  • †Cymbophora
  • †Cynepteris
    • †Cynepteris lasiophora
  • †Cypellospongia – type locality for genus
    • †Cypellospongia fimbriartis – type locality for species
  • †Czekanowskia
    • †Czekanowskia turneri – type locality for species

D
  • †Dakotadens – type locality for genus
    • †Dakotadens morrowi – type locality for species
    • †Dakotadens pertritus – type locality for species
  • †Dakotamys
    • †Dakotamys malcolmi – type locality for species
  • †Dakotaseps – type locality for genus
    • †Dakotaseps gillettorum – type locality for species
  • †Dakotasuchus
    • †Dakotasuchus kingi
  • †Deinonychus
  • †Denazinemys
    • †Denazinemys nodosa
  • Dentalium
    • †Dentalium sublineatum – or unidentified related form
  • Restoration of the Late Cretaceous horned dinosaur Diabloceratops
    †Diabloceratops – type locality for genus
    • †Diabloceratops eatoni – type locality for species
  • †Dicothodon – type locality for genus
    • †Dicothodon cifelli
    • †Dicothodon cifellii – type locality for species
    • †Dicothodon moorensis – type locality for species
  • †Dieneroceras
    • †Dieneroceras dieneri
  • †Dimekodontosaurus – type locality for genus
    • †Dimekodontosaurus madseni – type locality for species
  • †Dinehichnus – type locality for genus
    • †Dinehichnus socialis – type locality for species
  • †Dinochelys – type locality for genus
    • †Dinochelys whitei – type locality for species
  • †Dinophyton
    • †Dinophyton spinosus
  • †Dinosauropodes – type locality for genus
    • †Dinosauropodes bransfordii
    • †Dinosauropodes magrawii – type locality for species
    • †Dinosauropodes osborni
    • †Dinosauropodes wilsoni
  • †Diplochilus – tentative report
  • Life restoration of the Late Jurassic long-necked dinosaur Diplodocus
    †Diplodocus
    • †Diplodocus hallorum
    • †Diplodocus longus
  • Discinisca – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Docodon
  • †Dolichorhynchops
    • †Dolichorhynchops tropicensis – type locality for species
  • †Doswellia
  • †Drepanocheilus
    • †Drepanocheilus ruidium
  • †Dryolestes
    • †Dryolestes priscus
  • †Dryosaurus
    • †Dryosaurus altus
  • †Dystrophaeus – type locality for genus
    • †Dystrophaeus viaemalae – type locality for species

E
  • †Elegantinia
  • Elliptio
  • Restoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring"
    †Enchodus
  • †Enneabatrachus
  • †Entalophora
    • †Entalophora stokesi
  • †Entolioides
  • †Entolium
  • †Entradasuchus – type locality for genus
    • †Entradasuchus spinosus – type locality for species
  • †Eoalphadon
    • †Eoalphadon clemensi – type locality for species
    • †Eoalphadon lillegraveni – type locality for species
    • †Eoalphadon woodburnei – type locality for species
  • †Eocephalites
    • †Eocephalites primus
  • †Eodelphis
  • †Eoginkgoites
  • Illustration of a reconstructed skull and restorative portrait of the Late Cretaceous primitive duck-billed dinosaur Eolambia
    †Eolambia – type locality for genus
    • †Eolambia caroljonesa – type locality for species
  • †Eopolycotylus – type locality for genus
    • †Eopolycotylus rankini – type locality for species
  • †Equisetites
  • †Equisetum
    • †Equisetum burchardtii
    • †Equisetum UD006 – informal
  • †Eryma
    • †Eryma jungostrix
  • †Eucalyptus
    • †Eucalyptus dakotensis
  • †Eumorphotis
    • †Eumorphotis beneckei – or unidentified comparable form
    • †Eumorphotis ericius – type locality for species
    • †Eumorphotis hinnitidea
    • †Eumorphotis multiformis
    • †Eumorphotis venetiana
    • †Eumorphotis virginensis – type locality for species
  • †Eunaticina
    • †Eunaticina textilis
  • †Euomphaloceras
  • †Euspira
    • †Euspira concinna
  • †Euthlastus
    • †Euthlastus cordiformis
  • †Eutretauranosuchus
  • †Evazoum
  • †Exesipollenites
    • †Exesipollenites tumulosus
  • Fossilized shell of the Jurassic-Cretaceous foam oyster Exogyra
    †Exogyra
    • †Exogyra acroumbonata
    • †Exogyra levis
  • †Exostinus – or unidentified comparable form

F
  • †Fabrosaurus – tentative report
  • Fossilized skeleton of the Early Cretaceous therizinossaur Falcarius
    †Falcarius – type locality for genus
    • †Falcarius utahensis – type locality for species
  • Ficus
    • †Ficus daphnogenoides
  • †Flemingites
  • †Frenelopsis
    • †Frenelopsis varians
    • †Frenelopsis variens

G
  • Mounted fossilized skeletons of the Early Cretaceous armored dinosaur Gastonia
    †Gastonia – type locality for genus
    • †Gastonia burgei – type locality for species
  • †Geltena
  • †Geminiraptor
    • †Geminiraptor suarezarum
  • †Germanonautilus – tentative report
  • †Gervillaria
    • †Gervillaria montanaensis
  • †Gervillia
  • Gleichenia
    • †Gleichenia comptoniaefolia
    • †Gleichenia delicatula
  • †Glirodon – type locality for genus
    • †Glirodon grandis – type locality for species
  • Globularia – tentative report
  • †Glyptops
    • †Glyptops plicatulus – type locality for species
  • †Gondolella
    • †Gondolella planata
  • †Goniobasis – tentative report
    • †Goniobasis subtortuosa
  • †Goniodiscus
    • †Goniodiscus smithi
  • †Goniomya
    • †Goniomya montanaensis
  • Restoration of the Late Jurassic-Early Cretaceous crocodile relative Goniopholis
    †Goniopholis
  • †Grallator
    • †Grallator cursorius
  • †Grammatodon
    • †Grammatodon haguei
  • †Gryphaea
    • †Gryphaea planoconvexa
  • †Gryphaeostrea
  • Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Gryposaurus
    †Gryposaurus
    • †Gryposaurus monumentensis – type locality for species
  • †Guodunites
    • †Guodunites hooveri
  • †Gwyneddichnium
  • †Gypsonictops

H
  • Life restoration of the Late Cretaceous oviraptorosaur Hagryphus
    †Hagryphus – type locality for genus
    • †Hagryphus giganteus – type locality for species
  • †Hamulus – tentative report
    • †Hamulus subquadratus
  • †Hanielites
  • †Harmodontosaurus – type locality for genus
    • †Harmodontosaurus emeryensis – type locality for species
  • †Hausmania
    • †Hausmania rigida
  • †Hedenstroemia
    • †Hedenstroemia kossmati
  • Hemiaster
    • †Hemiaster humphreysanus
  • †Hemicalypterus – type locality for genus
    • †Hemicalypterus weiri – type locality for species
  • †Heminajas – tentative report
    • †Heminajas balatonis – or unidentified comparable form
  • †Hemiprionites
    • †Hemiprionites typus
  • Life restoration of the Early Cretaceous Iguanodon relative Hippodraco
    †Hippodraco – type locality for genus
    • †Hippodraco scutodens – type locality for species
  • †Hispanosauropus
  • †Hoernesia
  • †Holocrinus
    • †Holocrinus dubius – tentative report
    • †Holocrinus smithi
  • †Homalopoma
    • †Homalopoma sinbadensis – type locality for species
  • †Homomya
  • †Hoplitosaurus – or unidentified comparable form
  • †Hoplosuchus – type locality for genus
    • †Hoplosuchus kayi – type locality for species
  • Restoration of two of the Permian-Late Cretaceous cartilaginous fish Hybodus
    †Hybodus
  • †Hyporosopora
    • †Hyporosopora nielsoni – type locality for species

I
  • †Icacinoxylon
    • †Icacinoxylon pittiense – type locality for species
  • †Idahocolumbites
    • †Idahocolumbites cheneyi
  • Life restoration of the Early Cretaceous Iguanodon relative Iguanacolossus
    †Iguanacolossus – type locality for genus
    • †Iguanacolossus fortis – type locality for species
  • †Iguanodon
    • †Iguanodon ottingeri – type locality for species
  • Ilex
  • Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
    †Inoceramus
    • †Inoceramus albertensis – or unidentified comparable form
    • †Inoceramus flavus
    • †Inoceramus gilberti
    • †Inoceramus koeneni
    • †Inoceramus pictus
    • †Inoceramus tenuistriatus – tentative report
    • †Inoceramus undabundus
  • †Inyoites
    • †Inyoites beaverensis – type locality for species
    • †Inyoites oweni
  • †Iqualadelphis
    • †Iqualadelphis lactea
  • †Iridotriton – type locality for genus
    • †Iridotriton hechti – type locality for species
  • †Ischyrhiza – or unidentified comparable form
  • Isocrinus
    • †Isocrinus nicoleti
  • Fossilized shell of the Permian-modern marine bivalve Isognomon
    Isognomon
    • †Isognomon perplana – or unidentified comparable form
  • †Iugomortiferum – type locality for genus
    • †Iugomortiferum thoringtoni – type locality for species

J
  • †Janumys – type locality for genus
    • †Janumys erebos – type locality for species
    • †Janumys erebros
  • †Jeanbesseiceras
    • †Jeanbesseiceras jacksoni
  • †Jugulator
    • †Jugulator amplissimus
  • †Juvenites
    • †Juvenites spathi – or unidentified related form
    • †Juvenites thermarum – or unidentified comparable form

K
  • Fossilized shells of the Jurassic brachiopod Kallirhynchia
    †Kallirhynchia
    • †Kallirhynchia myrina – type locality for species
  • †Kamerunoceras
  • †Kashmirites
    • †Kashmirites confusionensis
    • †Kashmirites meeki
    • †Kashmirites nivalis
    • †Kashmirites perrini
    • †Kashmirites seerleyi
    • †Kashmirites stepheni – type locality for species
    • †Kashmirites subarmatus
    • †Kashmirites utahensis – type locality for species
  • †Kayentapus
  • †Kokopellia – type locality for genus
    • †Kokopellia juddi – type locality for species
  • †Koparion – type locality for genus
    • †Koparion douglassi – type locality for species
  • †Koreanaornis
    • †Koreanaornis hamanensis – or unidentified comparable form
  • Life restoration of the Late Cretaceous horned dinosaur Kosmoceratops
    †Kosmoceratops – type locality for genus
    • †Kosmoceratops richardsoni – type locality for species
  • †Kouphichnium

L
  • †Ladinaticella
    • †Ladinaticella striatocostata
  • †Lanceolites
    • †Lanceolites bicarinatus
    • †Lanceolites compactus
  • †Lasalichthys – type locality for genus
    • †Lasalichthys hillsi – type locality for species
  • †Latochara
    • †Latochara latitruncata
  • †Laubopsis – tentative report
  • †Legumen
  • Fossilized skull of the Late Cretaceous alligator relative Leidyosuchus
    †Leidyosuchus
  • †Lenticidaris – type locality for genus
    • †Lenticidaris utahensis – type locality for species
  • †Lepidotes
    • †Lepidotes walcotti – type locality for species
  • Lepisosteus
  • †Leptalestes
  • †Leptochamops
    • †Leptochamops denticulatus
  • †Leptochondria
    • †Leptochondria curtocardinalis
    • †Leptochondria nuetzeli – type locality for species
    • †Leptochondria occidanea – type locality for species
    • †Leptochondria xijinwulanensis
  • Lima
  • †Lingularia
    • †Lingularia borealis
  • †Liopistha
    • †Liopistha meeki
  • †Liostrea
    • †Liostrea strigilecula
  • †Liriophyllum
    • †Liriophyllum UD012 – informal
  • †Lissodus
  • †Litakis
    • †Litakis gilmorei
  • †Lonchidion
  • Lopha
    • †Lopha engelmanni – or unidentified related form
  • Lucina
  • †Lyosoma
    • †Lyosoma enoda
    • †Lyosoma powelli
  • Life restoration of the Late Cretaceous tyrannosaur Lythronax
    †Lythronax – type locality for genus
    • †Lythronax argestes – type locality for species

M
  • Life restoration of the Late Cretaceous horned dinosaur Machairoceratops
    †Machairoceratops – type locality for genus
    • †Machairoceratops cronusi – type locality for species
  • †Macroelongatoolithus
    • †Macroelongatoolithus carlylei – type locality for species
  • †Mactromya – tentative report
  • †Magadiceramus
    • †Magadiceramus crenelatus
    • †Magadiceramus crenistriatus
    • †Magadiceramus soukupi
  • Magnolia
    • †Magnolia boulayana
  • †Mammites
    • †Mammites nodosoides
  • Life restoration of the Late Jurassic megalosaur Marshosaurus
    †Marshosaurus – type locality for genus
    • †Marshosaurus bicentesimus – type locality for species
  • †Martharaptor – type locality for genus
    • †Martharaptor greenriverensis – type locality for species
  • †Matonidium
    • †Matonidium brownii
    • †Matonidium lancipinnulum
  • †Meekoceras
    • †Meekoceras davisi
    • †Meekoceras gracilitatis
    • †Meekoceras millardense – type locality for species
    • †Meekoceras olivieri – type locality for species
  • †Megalosauripus
  • †Megasphaeroceras
    • †Megasphaeroceras rotundum – or unidentified comparable form
  • †Melvius
    • †Melvius chauliodous – or unidentified comparable form
  • Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus
    †Meniscoessus
    • †Meniscoessus intermedius
  • †Meniscognathus
    • †Meniscognathus altmani – or unidentified comparable form
    • †Meniscognathus molybrochoros – type locality for species
  • †Mesembrioxylon
    • †Mesembrioxylon stokesi
    • †Mesembrioxylon stokesii
  • †Mesembryoxylon
  • †Mesodma
    • †Mesodma formosa – or unidentified comparable form
    • †Mesodma hensleighi – or unidentified comparable form
    • †Mesodma minor – or unidentified comparable form
    • †Mesodma thompsoni – or unidentified comparable form
  • †Mesostoma
  • †Metoicoceras
    • †Metoicoceras geslinianum
  • †Microcachrydites
  • †Microconchus
    • †Microconchus utahensis
  • †Microeciella
    • †Microeciella duoflavina
    • †Microeciella pollostos – type locality for species
  • †Minersvillites – type locality for genus
    • †Minersvillites farai – type locality for species
  • †Miocidaris
    • †Miocidaris utahensis
  • Mounted fossilized skeletons of the Early Cretaceous long-necked dinosaur Moabosaurus
    †Moabosaurus – type locality for genus
    • †Moabosaurus utahensis – type locality for species
  • Modiolus
    • †Modiolus isonemus
    • †Modiolus subimbricatus
  • †Monanthesia
  • †Monocnemodon – type locality for genus
    • †Monocnemodon syphakos – type locality for species
  • †Moros – type locality for genus[1]
  • †Myalina
  • †Myledaphus
    • †Myledaphus bipartitus
  • †Myoconcha
    • †Myoconcha plana – or unidentified comparable form
  • †Myopholas
    • †Myopholas hardyi
  • Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella
    †Myophorella
    • †Myophorella livinigstonensis
    • †Myophorella monatanaensis
    • †Myophorella yellowstonensis
  • †Myophoria
  • †Mytiloides
    • †Mytiloides submytiloides – or unidentified related form
  • †Mytilus
    • †Mytilus whitei – or unidentified comparable form

N
  • †Naomichelys
  • Known material diagram of the Late Cretaceous horned dinosaur Nasutoceratops
    †Nasutoceratops – type locality for genus
    • †Nasutoceratops titusi – type locality for species
  • †Naticopsis
    • †Naticopsis depressispira
    • †Naticopsis fenestravella – type locality for species
    • †Naticopsis utahensis – type locality for species
  • †Natiria
    • †Natiria aequicostata – type locality for species
    • †Natiria costata – or unidentified comparable form
  • †Nedcolbertia – type locality for genus
    • †Nedcolbertia justinhoffmanni – type locality for species
  • †Nemodon
  • †Neocardioceras
    • †Neocardioceras juddii
  • †Neocrioceras
  • †Neoschizodus
    • †Neoschizodus laevigatus
    • †Neoschizodus orbicularis – or unidentified comparable form
    • †Neoschizodus praeorbicularis
    • †Neoschizodus thaynesianus – type locality for species
  • †Neridomus – tentative report
  • Fossilized shell of the Jurassic-Cretaceous sea snail Nerinea
    †Nerinea – tentative report
  • †Neritaria
    • †Neritaria costata – type locality for species
  • Neritina
    • †Neritina phaseolaris
  • †Neurankylus
  • †Nezpercius
    • †Nezpercius dodsoni
  • †Nilsonia
    • †Nilsonia lewisii – type locality for species
  • †Nilssoniopteris
  • †Nododelphinula – tentative report
  • †Normannites – tentative report
    • †Normannites crickmayi – or unidentified related form
  • Mounted fossilized skeleton of the Late Cretaceous Nothronychus
    †Nothronychus
    • †Nothronychus graffami – type locality for species
  • Nucula
  • Nuculana
    • †Nuculana mutuata – or unidentified comparable form
  • †Nymphalucina
    • †Nymphalucina linearia – or unidentified related form

O
  • †Obnixia – type locality for genus
    • †Obnixia thaynesiana
  • †Odaxosaurus
    • †Odaxosaurus piger – or unidentified comparable form
    • †Odaxosaurus priscus
    • †Odaxosaurus roosevelti – type locality for species
  • †Omphaloptycha
    • †Omphaloptycha hormolira – type locality for species
  • †Omphaloptychia
    • †Omphaloptychia laevisphaera – type locality for species
  • Oncousoecia – tentative report
  • †Ooliticia – tentative report
  • †Ophioglypha
    • †Ophioglypha utahensis – type locality for species
  • †Opisthias
  • †Ornithomimus
  • †Osteocallis
    • †Osteocallis mandibulus
  • Ostrea
    • †Ostrea occidentalis
    • †Ostrea strigulecula
  • Mounted fossilized skeleton of the Late Jurassic herbivorous dinosaur Othnielosaurus
    †Othnielosaurus
    • †Othnielosaurus consors
  • †Otozoum
  • †Ovaloolithus
    • †Ovaloolithus tenuisus – type locality for species
    • †Ovaloolithus utahensis – type locality for species
  • †Owenites
    • †Owenites carpenteri
    • †Owenites koeneni

P
  • †Pachyomphalus
    • †Pachyomphalus americanus – type locality for species
  • Fossilized foliage of the Carboniferous-Late Cretaceous plant Pagiophyllum
    †Pagiophyllum
  • †Paiutemys – type locality for genus
    • †Paiutemys tibert – type locality for species
  • †Palaeophycus – or unidentified comparable form
  • †Palaeopiceoxylon
    • †Palaeopiceoxylon thinosu
    • †Palaeopiceoxylon thinosus
  • †Palaeoscincosaurus
    • †Palaeoscincosaurus pharkidodon – type locality for species
  • †Paleoaster
    • †Paleoaster inquirenda
  • †Palmulasaurus – type locality for genus
    • †Palmulasaurus quadratus – type locality for species
  • †Parachondroceras
    • †Parachondroceras andrewsi
    • †Parachondroceras filicostatum – or unidentified comparable form
  • †Paracimexomys
    • †Paracimexomys judithae – or unidentified comparable form
    • †Paracimexomys magnus
    • †Paracimexomys perplexus – type locality for species
    • †Paracimexomys priscus – or unidentified comparable form
    • †Paracimexomys robisoni – type locality for species
  • †Paraglyphanodon – type locality for genus
    • †Paraglyphanodon gazini – type locality for species
    • †Paraglyphanodon utahensis – type locality for species
  • †Parallelodon – tentative report
    • †Parallelodon beyrichii – or unidentified related form
  • †Paramacellodus
    • †Paramacellodus oweni – or unidentified comparable form
  • †Paranyctoides
  • †Paraphyllanthoxylon
    • †Paraphyllanthoxylon utahense
  • †Parasaniwa
    • †Parasaniwa cynochoros – type locality for species
    • †Parasaniwa wyomingensis – or unidentified comparable form
  • Life restoration of the Late Cretaceous duck-billed dinosaur Parasaurolophus being preyed upon by the tyrannosaur Teratophoneus
    †Parasaurolophus
    • †Parasaurolophus cyrtocristatus
  • †Pariadens
    • †Pariadens kirklandi – type locality for species
    • †Pariadens mckennai – type locality for species
  • †Parmicorbula
  • †Paronychodon – or unidentified comparable form
  • †Parotosuchus
    • †Parotosuchus nov. spec. – informal
  • †Parussuria
    • †Parussuria compressa
  • †Patulopora
    • †Patulopora cutleri
  • †Paullia
  • †Pediomys – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Pegmavalvula
    • †Pegmavalvula triassica
  • †Pelecypodichnus
  • †Peloroplites – type locality for genus
    • †Peloroplites cedrimontanus – type locality for species
  • †Peneteius – type locality for genus
    • †Peneteius saueri – type locality for species
  • †Pentasauropus
  • †Periallus
    • †Periallus woodsidensis
  • †Perissoptera
  • †Permophorus
    • †Permophorus bregeri – or unidentified comparable form
    • †Permophorus triassicus
  • †Pernopecten
  • †Phelopteria
    • †Phelopteria minuta – or unidentified comparable form
  • †Phlebopteris
  • Fossilized shell of the Early Triassic-Pliocene marine bivalve Pholadomya
    Pholadomya
    • †Pholadomya inaequiplicata
    • †Pholadomya kingi
  • †Piarorhynchella
    • †Piarorhynchella triassica
    • †Piarorhynchella triassicus
  • †Picopsis
  • †Pinacosuchus – type locality for genus
    • †Pinacosuchus mantiensis – type locality for species
  • Pinna
    • †Pinna kingi
  • †Pistia – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Pistia corrugata
  • †Pityoxylon
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Placenticeras
    †Placenticeras
    • †Placenticeras cumminsi
  • Placopsilina
  • †Plagioglypta
  • †Plagiostoma
    • †Plagiostoma occidentalis
    • †Plagiostoma ziona
  • †Planicoxa – type locality for genus
    • †Planicoxa venenica – type locality for species
  • †Planolites
  • †Plataninium
  • †Plesiopinna
  • †Pleuromya
    • †Pleuromya musculoides – or unidentified comparable form
    • †Pleuromya prima – type locality for species
    • †Pleuromya subcompressa
  • †Pleuronautilus
  • †Pleuronectites
  • Pleurotomaria – tentative report
  • Plicatula
    • †Plicatula ferryi – or unidentified comparable form
  • †Podozamites
  • †Polyacrodus – tentative report
  • †Polyglyphanodon – type locality for genus
    • †Polyglyphanodon sternbergi – type locality for species
  • †Polygyrina
  • Restoration of the Late Triassic crocodile relative Poposaurus with an anachronistic human to scale
    †Poposaurus
    • †Poposaurus gracilis
  • †Preflorianites
    • †Preflorianites toulai
  • †Preprismatoolithus
    • †Preprismatoolithus coloradensis
  • †Priacodon
  • †Primaderma – type locality for genus
    • †Primaderma nessovi – type locality for species
  • †Prismatoolithus
    • †Prismatoolithus jenseni – type locality for species
  • †Procerithium – tentative report
  • †Promathildia
    • †Promathildia spirocostata – type locality for species
  • †Promyalina
    • †Promyalina putiatinensis
    • †Promyalina spathi
  • †Promysidiella
  • †Pronoella
    • †Pronoella cinnabarensis – or unidentified comparable form
    • †Pronoella uintahensis
  • †Proplacenticeras
    • †Proplacenticeras stantoni
  • †Prorokia
    • †Prorokia fontenellensis
  • †Protalphadon
  • †Protocardia
  • †Protogusarella
    • †Protogusarella smithi
  • †Protopis
    • †Protopis waageni – or unidentified related form
  • †Protovirgularia
  • †Psalandon – tentative report
  • †Pseudaspidoceras
  • †Pseudocalycoceras
  • †Pseudocorbula
  • †Pseudohypolophus
  • Fossilized shell of a Pseudomelania sea snail
    †Pseudomelania
  • †Pseudomyoconcha – tentative report
  • †Pseudoptera
  • †Pseudosageceras
    • †Pseudosageceras multilobatum
  • †Pseudosaurillus – or unidentified comparable form
  • †Pseudotetrasauropus
  • †Pseudotritonium
    • †Pseudotritonium sciaphosterum – type locality for species
  • †Psilomya
    • †Psilomya concentrica – or unidentified related form
    • †Psilomya elongata – or unidentified related form
  • †Pteraichnus
    • †Pteraichnus saltwashensis – or unidentified comparable form
    • †Pteraichnus stokesi – or unidentified comparable form
  • †Ptychotrigon
  • Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
    Pycnodonte
    • †Pycnodonte newberryi

Q
  • †Quenstedtia
    • †Quenstedtia bathonica – or unidentified related form

R
  • †Radioceras
    • †Radioceras evolvens – or unidentified related form
  • Fossilized skeleton of the Late Triassic phytosaur Redondasaurus
    †Redondasaurus
    • †Redondasaurus gregorii
  • Rhabdocolpus
    • †Rhabdocolpus viriosus
  • †Rhadinosteus – type locality for genus
    • †Rhadinosteus parvus – type locality for species
  • †Rhynchonella – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Rhynchosauroides
    • †Rhynchosauroides schochardti
  • †Rhynchostreon
    • †Rhynchostreon levis
  • Micrograph with magnified inset of a fossilized tooth of the Late Cretaceous theropod dinosaur Richardoestesia
    †Richardoestesia
    • †Richardoestesia isosceles – or unidentified comparable form
  • Rogerella
  • †Rotodactylus
    • †Rotodactylus cursorius – type locality for species

S
  • †Sabalites
    • †Sabalites NE008 – informal
  • Salix
    • †Salix newberryana
  • Life restoration of the Early Cretaceous armored dinosaurs Sauropelta
    †Sauropelta – or unidentified comparable form
  • †Scapherpeton
  • †Schillerosaurus – type locality for genus
    • †Schillerosaurus utahensis – type locality for species
  • †Sciponoceras
    • †Sciponoceras gracile
  • †Scotiophryne
    • †Scotiophryne pustulosa
  • †Scoyenia
  • Known material diagram of the Early Jurassic primitive long-necked dinosaur Seitaad
    †Seitaad – type locality for genus
    • †Seitaad ruessi – type locality for species
  • †Sementiconcha – type locality for genus
    • †Sementiconcha recuperator – type locality for species
  • †Semionotus
    • †Semionotus kanabensis – type locality for species
  • Serpula
    • †Serpula intrica
    • †Serpula large
  • †Sexta
    • †Sexta navicula – or unidentified related form
  • Life restoration of the Late Cretaceous theropod dinosaur Siats
    †Siats – type locality for genus
    • †Siats meekerorum – type locality for species
  • †Simplicidium
  • †Sinbadelphys
    • †Sinbadelphys schmidti
  • †Sinbadiella – type locality for genus
    • †Sinbadiella pygmaea – type locality for species
  • †Skolithos
  • †Sohlites
    • †Sohlites spinosus
  • Solemya
    • †Solemya obscura
  • †Soleniscus
  • †Spalacolestes
    • †Spalacolestes cretulablatta
    • †Spalacolestes inconcinnus – type locality for species
  • †Spalacotheridium – type locality for genus
    • †Spalacotheridium mckennai – type locality for species
    • †Spalacotheridium noblei
  • Fossils of the dinosaur egg oogenus Spheroolithus
    †Spheroolithus
  • †Spheruprismatoolithus – type locality for genus
    • †Spheruprismatoolithus condensis
    • †Spheruprismatoolithus condensus – type locality for species
  • Spirorbis – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Spirorbis valvata – or unidentified comparable form
  • †Spongioolithus – type locality for genus
    • †Spongioolithus hirschi – type locality for species
  • †Squatirhina
    • †Squatirhina americana
  • †Stagonolepis
  • †Stegopodus – type locality for genus
    • †Stegopodus czerkasi – type locality for species
  • Restoration of the Late Jurassic stegosaur Stegosaurus
    †Stegosaurus
    • †Stegosaurus stenops – or unidentified comparable form
    • †Stegosaurus ungulatus
  • †Stellatochara
    • †Stellatochara obovata
  • †Stemmatoceras
    • †Stemmatoceras albertense – or unidentified related form
    • †Stemmatoceras arcicostum
  • †Stephanoceras
    • †Stephanoceras nodosum – or unidentified related form
  • Life restoration of the primitive tyrannosaur Stokesosaurus
    †Stokesosaurus – type locality for genus
    • †Stokesosaurus clevelandi – type locality for species
  • Stomatopora
  • †Stomohamites
  • †Strobeus
    • †Strobeus batteni
  • †Submeekoceras
    • †Submeekoceras mushbachanum
  • †Symmetrocapulus – tentative report
    • †Symmetrocapulus corrugatus
  • †Symmetrodontoides
    • †Symmetrodontoides foxi – type locality for species
    • †Symmetrodontoides oligodontos – type locality for species
  • †Syncyclonema
  • †Synorichthys
    • †Synorichthys stewarti

T
  • Known material diagram of the Late Cretaceous troodontid Talos
    †Talos – type locality for genus
  • †Tancredia – tentative report
  • †Tanycolagreus
    • †Tanycolagreus topwilsoni
  • †Teinostomopsis – tentative report
  • †Tempskya
    • †Tempskya jonesii – type locality for species
    • †Tempskya knowltoni
    • †Tempskya minor
    • †Tempskya superba
    • †Tempskya whiteheadi – type locality for species
  • †Tenontosaurus
  • Known material diagram of the Late Cretaceous tyrannosaur Teratophoneus
    †Teratophoneus – type locality for genus
    • †Teratophoneus curriei – type locality for species
  • Teredolites
    • †Teredolites clavatus
  • †Tethyaster
    • †Tethyaster jurassicus – type locality for species
  • †Tetrasauropus
  • †Thalassinoides
  • †Therangopodus – tentative report
  • †Therangospodus – type locality for genus
    • †Therangospodus pandemicus – type locality for species
  • †Theretairus
  • †Thescelus
    • †Thescelus insiliens
  • Thracia
    • †Thracia weedi
  • †Tirolites
    • †Tirolites carniolicus – tentative report
    • †Tirolites smithi – or unidentified related form
  • Mounted fossilized skeleton of the Late Jurassic megalosaur Torvosaurus
    †Torvosaurus
  • †Toxolophosaurus – or unidentified comparable form
  • †Trachodon
  • †Torosaurus
    • †Torosaurus utahensis
  • †Triconolestes – type locality for genus
    • †Triconolestes curvicuspis – type locality for species
  • †Trigonia
    • †Trigonia americana
    • †Trigonia elegantissima
    • †Trigonia montanaensis
  • †Trigonodus
    • †Trigonodus orientalis – or unidentified comparable form
    • †Trigonodus sandbergeri – or unidentified comparable form
    • †Trigonodus sandbergi – or unidentified comparable form
  • Fossilized skeleton of the Late Cretaceous polycotylid plesiosaur Trinacromerum
    †Trinacromerum
    • †Trinacromerum bentonianum – tentative report
  • †Tripennaculus – type locality for genus
    • †Tripennaculus eatoni – type locality for species
  • †Trisauropodiscus
    • †Trisauropodiscus moabensis – type locality for species
  • Trochocyathus
  • †Trochosmilia
    • †Trochosmilia moorei – type locality for species
  • †Tulotomops
    • †Tulotomops laevibasalis
  • †Turgidodon – type locality for genus
    • †Turgidodon lillegraveni – type locality for species
    • †Turgidodon madseni – type locality for species
    • †Turgidodon russelli – or unidentified comparable form
  • Turritella
    • †Turritella whitei
  • †Tylostoma – tentative report
  • Fossil of the Late Cretaceous tyrannosaur footprint ichnogenus Tyrannosauripus
    †Tyrannosauripus – type locality for genus
    • †Tyrannosauripus petersoni – type locality for species

U
  • †Undichnia
  • †Unicardium
  • †Unionites
    • †Unionites borealis – or unidentified comparable form
    • †Unionites fassaensis
  • †Ussurites
    • †Ussurites hosei
  • †Utahceratops – type locality for genus
    • †Utahceratops gettyi – type locality for species
  • †Utahgenys – type locality for genus
    • †Utahgenys antongai – type locality for species
    • †Utahgenys evansi – type locality for species
  • Diagram illustrating the Early Cretaceous dromaeosaurid ("raptor") Utahraptor with an anachronistic human to scale
    †Utahraptor – type locality for genus
    • †Utahraptor ostrommaysi – type locality for species
  • †Uteodon
    • †Uteodon aphanoecetes

V
  • Valvata
  • Life restoration of the Late Triassic reptile Vancleavea
    †Vancleavea
    • †Vancleavea campi
  • †Varalphadon – type locality for genus
    • †Varalphadon crebreforme – type locality for species
    • †Varalphadon wahweapensis – type locality for species
  • †Vaugonia
    • †Vaugonia conradi
    • †Vaugonia utahensis
  • †Venenosaurus – type locality for genus
    • †Venenosaurus dicrocei – type locality for species
  • †Vercherites
    • †Vercherites undulatus – type locality for species
  • †Vex
  • Shell of a Viviparus freshwater snail
    Viviparus

W
  • †Wailiceras
    • †Wailiceras aemulus – or unidentified comparable form
  • †Wasatchites
    • †Wasatchites perrini
  • †Webbsaurus – type locality for genus
    • †Webbsaurus lofgreni – type locality for species
  • †Worthenia
    • †Worthenia windowblindensis – type locality for species
  • †Wortheniella
    • †Wortheniella canalifera – or unidentified comparable form
  • †Worthoceras
  • †Wyomingites
    • †Wyomingites aplanatus – or unidentified comparable form

X
  • †Xenoceltites
    • †Xenoceltites cordilleranus
    • †Xenoceltites subevolutus
  • †Xiaoqiaoceras – tentative report
    • †Xiaoqiaoceras americanum – type locality for species

Y
  • Life restoration of the Early Cretaceous dromaeosaurid ("raptor") Yurgovuchia
    †Yurgovuchia – type locality for genus
    • †Yurgovuchia doellingi – type locality for species

Z
  • Fossil of the Early Triassic-Eocene cycad-like frond Zamites
    †Zamites
    • †Zamites powelli
    • †Zamites tidwellii – type locality for species
  • †Zygiocuspis – type locality for genus
    • †Zygiocuspis goldingi – type locality for species
  • †Zygopleura
    • †Zygopleura haasi – type locality for species


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References
  1. Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.
  2. Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.
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