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
  • †Ilex serrata
•  

  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]
  • †Moros intrepidus – type locality for species^[2]
• †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
  • †Talos sampsoni – type locality for species
• †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

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.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.