List of the Mesozoic life of Colorado

This list of the Mesozoic 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 252.17 and 66 million years of age.

A
  • †Acanthichnus – tentative report
  • Acila
    • †Acila chicotana
  • Acmaea
    • †Acmaea genettae – type locality for species
  • †Adocus
  • †Albanerpeton
    • †Albanerpeton nexuosus
  • †Albertosaurus – tentative report
  • †Aletridelphys
    • †Aletridelphys hatcheri
  • †Allantodiopsis
    • †Allantodiopsis erosa
    • †Allantodiopsis JC018 – informal
  • Life restoration of the Late Jurassic theropod dinosaur Allosaurus
    †Allosaurus – type locality for genus
    • †Allosaurus fragilis – type locality for species
    • †Allosaurus lucasi – type locality for species
  • †Amblotherium – type locality for genus
    • †Amblotherium gracilis
  • Amia
  • †Amphicoelias – type locality for genus
    • †Amphicoelias altus – type locality for species
  • Fossilized skull of the Late Jurassic crocodile relative Amphicotylus
    †Amphicotylus
    • †Amphicotylus lucasii – type locality for species
  • †Amplovalvata
    • †Amplovalvata scabrida
  • †Anaklinoceras
    • †Anaklinoceras minutum – type locality for species
    • †Anaklinoceras reflexum
  • †Anisoceras
    • †Anisoceras plicatilis
  • †Anisomyon
    • †Anisomyon centrale
  • †Anomia
    • †Anomia subquadrata
    • †Anomia tellinoides
  • Fossil (right) of the Early Jurassic dinosaur footprint ichnogenus Anomoepus
    †Anomoepus – tentative report
  • †Apateodus
  • †Apatopus
  • †Apatosaurus – type locality for genus
    • †Apatosaurus ajax – type locality for species
    • †Apatosaurus laticollis – type locality for species. Junior synonym of A. louisae.
    • †Apatosaurus louisae
  • †Arcellites
    • †Arcellites disciformis
  • †Archaeolamna
    • †Archaeolamna kopingensis
  • †Arenicolites
  • Aspideretes
    • †Aspideretes vagans – type locality for species
  • †Aspideretoides
  • Astarte
  • †Atlantosaurus
    • †Atlantosaurus immanis – type locality for species
  • †Axonoceras
    • †Axonoceras compressum

B
  • †Baculites
    • †Baculites aquilaensis
    • †Baculites asper
    • †Baculites clinolobatus – type locality for species
    • †Baculites codyensis
    • †Baculites compressus
    • †Baculites cuneatus
    • †Baculites grandis
    • †Baculites haresi
    • †Baculites mclearni
    • †Baculites meeki – type locality for species
    • †Baculites reesidei
  • Restoration of the Late Jurassic sauropod dinosaur Barosaurus rearing to defend itself against a pair of the theropod Allosaurus
    †Barosaurus
  • †Basilemys
    • †Basilemys sinuosa – or unidentified comparable form
  • †Behuninia
    • †Behuninia provoensis
  • †Bellifusus
  • †Bison
    • †Bison alticornis – type locality for species
  • †Borealosuchus
    • †Borealosuchus sternbergii
  • †Brachauchenius – or unidentified comparable form
  • †Brachiosaurus – type locality for genus
    • †Brachiosaurus altithorax – type locality for species
  • †Brachychampsa
    • †Brachychampsa montana
  • †Brachychirotherium
  • †Brachyphyllum
    • †Brachyphyllum rechtenii – type locality for species
  • Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus
    †Brontosaurus
    • †Brontosaurus excelsus
    • †Brontosaurus yahnahpin

C
  • †Calycoceras
    • †Calycoceras canitaurinum
    • †Calycoceras naviculare
  • Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus
    †Camarasaurus – type locality for genus
    • †Camarasaurus agilis – type locality for species
    • †Camarasaurus grandis
    • †Camarasaurus lewisi
    • †Camarasaurus supremus – type locality for species
  • †Camptosaurus – type locality for genus
    • †Camptosaurus dispar – type locality for species
  • Carcharias
    • †Carcharias amonensis
    • †Carcharias saskatchewanensis
    • †Carcharias tenuiplicatus
  • †Caririchnium
    • †Caririchnium leonardii – type locality for species
    • †Caririchnium leonaridii
  • †Cataceramus
    • †Cataceramus gladbeckensis
  • †Cedrobaena
    • †Cedrobaena brinkman
  • †Ceratodus – type locality for genus
    • †Ceratodus felchi – type locality for species
    • †Ceratodus guentheri – type locality for species
  • Restoration of the Late Jurassic ceratosaur Ceratosaurus
    †Ceratosaurus – type locality for genus
    • †Ceratosaurus nasicornis – type locality for species
  • Cerithiopsis
  • †Champsosaurus
  • Chara
  • †Chelonipus
  • †Chinlea
    • †Chinlea sorenseni
  • †Chinlestegophis – type locality for genus
    • †Chinlestegophis jenkinsi – type locality for species
  • †Chirotherium
    • †Chirotherium lulli
  • †Cimolichthys
    • †Cimolichthys nepaholica
  • †Cimolodon – or unidentified comparable form
  • Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys
    †Cimolomys
  • †Cionichthys
    • †Cionichthys dunklei
  • †Cionodon – type locality for genus
    • †Cionodon arctatus – type locality for species
  • †Cirroceras
    • †Cirroceras conradi
  • †Cladoceramus
    • †Cladoceramus undulatoplicatus
  • †Clidastes
  • †Clioscaphites
    • †Clioscaphites choteauensis
    • †Clioscaphites saxitonianus
    • †Clioscaphites vermiformis
  • †Coahuilites
    • †Coahuilites sheltoni
  • †Cochlichnus
  • †Codellaster – type locality for genus
    • †Codellaster keepersae – type locality for species
  • †Coelophysis – tentative report
  • Diagram illustrating the known fossil material of the Late Jurassic theropod dinosaur Coelurus
    †Coelurus
    • †Coelurus fragilis
  • †Compsemys
  • †Coniasaurus
    • †Coniasaurus crassidens
  • Corbula
  • †Corydalites – type locality for genus
    • †Corydalites fecundum – type locality for species
  • Crassatella
    • †Crassatella franzeseii
  • †Cremnoceramus
    • †Cremnoceramus deformis
  • †Crenella
  • †Creonella
    • †Creonella triplicata
  • †Cretodus
    • †Cretodus semiplicatus
  • †Cretolamna
    • †Cretolamna appendiculata
  • †Cretomanta
    • †Cretomanta canadensis
  • Restoration of the Late Cretaceous shark Cretoxyrhina, or the Ginsu shark
    †Cretoxyrhina
    • †Cretoxyrhina mantelli
  • Cucullaea
    • †Cucullaea nebrascensis
  • Cuspidaria
    • †Cuspidaria ventricosa
  • †Czekanowskia
    • †Czekanowskia turneri – tentative report

D
  • †Diablophis
    • †Diablophis gilmorei – type locality for species
  • †Didymoceras
    • †Didymoceras aurarium – type locality for species
    • †Didymoceras cheyennense
    • †Didymoceras draconis
    • †Didymoceras stevensoni
  • †Dinehichnus
    • †Dinehichnus socialis
  • †Dinochelys
    • †Dinochelys whitei
  • Diagram illustrating the Late Jurassic sauropod dinosaurs Diplodocus carnegii (green) and D. hallorum (orange) with an anachronistic human to scale.
    †Diplodocus – type locality for genus
    • †Diplodocus lacustris – type locality for species
    • †Diplodocus longus – type locality for species
  • Diplodonta
    • †Diplodonta davisi
  • †Diplosaurus
    • †Diplosaurus felix – type locality for species
  • Discinisca
  • †Discoscaphites
    • †Discoscaphites conradi
  • †Docodon
    • †Docodon apoxys – type locality for species
  • †Dorsetisaurus
  • Fossilized skull of the Late Jurassic-Early Cretaceous turtle Dorsetochelys
    †Dorsetochelys
    • †Dorsetochelys buzzops – type locality for species
  • †Drepanocheilus
    • †Drepanocheilus evansi
    • †Drepanocheilus nebrascensis
    • †Drepanocheilus obesus
  • †Dryophyllum
    • †Dryophyllum tennesseensis
  • †Dryosaurus
    • †Dryosaurus altus

E
  • †Edmontonia
  • Skeletal reconstruction and restored soft tissue of the Late Cretaceous duck-billed dinosaur Edmontosaurus regalis with an anachronistic human to scale
    †Edmontosaurus
  • Eilenodon – type locality for genus
    • †Eilenodon robustus – type locality for species
  • †Elopopsis
  • †Enchodus
    • †Enchodus gladiolus – or unidentified comparable form
    • †Enchodus shumardi – or unidentified comparable form
  • †Entolium
  • †Eoacteon
    • †Eoacteon sublinearis
  • †Eomunidopsis
    • †Eomunidopsis cobbani – type locality for species
  • †Eosauropus
    • †Eosauropus cimarronensis
    • †Eosauropus cimmaronensis
  • A living Equisetum, or horsetail
    †Equisetum
    • †Equisetum burchardtii – or unidentified comparable form
  • †Etea
    • †Etea peasei
  • †Eubrontes
    • †Eubrontes giganteus
  • †Eucalycoceras
    • †Eucalycoceras pentagonum
  • †Euomphaloceras
    • †Euomphaloceras septemseriatum
  • †Eutrephoceras
    • †Eutrephoceras dekayi
  • †Eutretauranosuchus – type locality for genus
    • †Eutretauranosuchus delfsi – type locality for species
  • †Exiteloceras
    • †Exiteloceras jenneyi
  • †Exogyra
    • †Exogyra boveyensis – or unidentified related form

F
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia
    †Fagesia
  • Ficus
    • †Ficus planicostata
  • †Forresteria
    • †Forresteria hobsoni – type locality for species
  • †Fruitachampsa – type locality for genus
    • †Fruitachampsa callisoni – type locality for species
  • †Fruitadens – type locality for genus
    • †Fruitadens haagarorum – type locality for species
  • †Fruitafossor – type locality for genus
    • †Fruitafossor windscheffeli – type locality for species

G
  • Fossilized skull of the Late Jurassic sauropod dinosaur Galeamopus
    †Galeamopus
    • †Galeamopus pabsti
  • †Glirodon
    • †Glirodon grandis
  • †Glyptops
    • †Glyptops plicatulus – type locality for species
  • †Goniopholis
    • †Goniopholis felchi – type locality for species
  • †Grallator
    • †Grallator cursorius
    • †Grallator tenuis
  • †Gryphaeostrea
  • †Gwyneddichnium
  • †Gypsonictops
  • †Gyroides

H
  • Restoration of the Late Jurassic crocodile relative Hallopus
    †Hallopus
    • †Hallopus victor – type locality for species
  • †Haplocanthosaurus – type locality for genus
    • †Haplocanthosaurus delfsi – type locality for species
    • †Haplocanthosaurus priscus – type locality for species
  • †Harduinia
    • †Harduinia stantoni
    • †Harduinia taylori
  • †Haresiceras
    • †Haresiceras placentiforme
  • †Helopanoplia
    • †Helopanoplia distincta – or unidentified comparable form
  • †Hemicalypterus
  • †Hermanophyton
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Herrickiceras
    †Herrickiceras
    • †Herrickiceras costatus
  • †Holaster
    • †Holaster feralis – type locality for species
  • †Homolopsis
  • †Hoploscaphites[1]
    • †Hoploscaphites birkelundae
    • †Hoploscaphites landesi
    • †Hoploscaphites macer[1]
    • †Hoploscaphites nicolletii
  • †Hulettia – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Hulettia hawesi – type locality for species
  • †Hypsirophus – type locality for genus
    • †Hypsirophus discurus – type locality for species

I
  • †Ichthyodectes
  • †Ignotornis – type locality for genus
    • †Ignotornis mcconnelli – type locality for species
  • Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
    †Inoceramus
    • †Inoceramus altus
    • †Inoceramus altusiformis
    • †Inoceramus anomalus
    • †Inoceramus arnoldi
    • †Inoceramus balticus
    • †Inoceramus brancoiformis
    • †Inoceramus bueltenensis
    • †Inoceramus cordiformis
    • †Inoceramus crippsi – or unidentified related form
    • †Inoceramus deformis
    • †Inoceramus erectus
    • †Inoceramus flavus
    • †Inoceramus grandis
    • †Inoceramus longealatus
    • †Inoceramus muelleri - or unidentified loosely related form
    • †Inoceramus oblongus
    • †Inoceramus pictus
    • †Inoceramus prefragilis
    • †Inoceramus rutherfordi – or unidentified comparable form
    • †Inoceramus tenuistriatus – tentative report
  • †Ischyrhiza
    • †Ischyrhiza avonicola – or unidentified comparable form

J
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Jeletzkytes
    †Jeletzkytes
    • †Jeletzkytes brevis
    • †Jeletzkytes dorfi
    • †Jeletzkytes nodosus
  • †Jensensispermum
    • †Jensensispermum redmondii
  • Jupiteria
    • †Jupiteria scitula

K
  • †Kepodactylus – type locality for genus
    • †Kepodactylus insperatus – type locality for species

L
  • †Laosaurus – report made of unidentified related form or using admittedly obsolete nomenclature
  • Laternula
  • Lepisosteus – tentative report
    • †Lepisosteus occidentalis
  • †Leptalestes – tentative report
    • †Leptalestes cooki
  • Restoration of a school of the Middle Triassic-Early Cretaceous bony fish Leptolepis
    †Leptolepis – or unidentified comparable form
  • †Lewyites
    • †Lewyites oronensis
  • Lima
    • †Lima janetae – type locality for species
  • †Lingula
  • †Lioestheria
    • †Lioestheria tendagurensis – or unidentified comparable form
  • †Lisserpeton
    • †Lisserpeton bairdi
  • †Lonchidion
    • †Lonchidion selachos
  • †Lucina
  • †Lyropecten

M
  • Diagram illustrating the known fossil material of two specimens of the Late Jurassic crocodile relative Macelognathus
    †Macelognathus
    • †Macelognathus vagans
  • †Magadiceramus
    • †Magadiceramus complicatus
    • †Magadiceramus crenelatus
    • †Magadiceramus soukupi - or unidentified loosely related form
    • †Magadiceramus subquadratus
  • †Magnoavipes
    • †Magnoavipes caneeri – type locality for species
  • †Marmarthia – or unidentified comparable form
    • †Marmarthia pearsonii
  • †Marshosaurus – or unidentified comparable form
  • Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus
    †Meniscoessus
    • †Meniscoessus collomensis – type locality for species
    • †Meniscoessus conquistus
    • †Meniscoessus robustus – or unidentified comparable form
  • †Mesadactylus – type locality for genus
    • †Mesadactylus ornithosphyos – type locality for species
  • †Mesembrioxylon
    • †Mesembrioxylon carterii – type locality for species
  • †Mesodma
    • †Mesodma formosa – or unidentified comparable form
  • †Mesojassoides – type locality for genus
    • †Mesojassoides gigantea – type locality for species
  • †Mesolanistes
    • †Mesolanistes reesidei
  • †Metengonoceras
    • †Metengonoceras dumbli
  • †Metoicoceras
    • †Metoicoceras geslinianum
  • †Micrabacia
    • †Micrabacia radiata
  • †Micropycnodon
    • †Micropycnodon kansasensis
  • †Modiolus
    • †Modiolus kremmlingensis – type locality for species
    • †Modiolus meeki
  • †Moremanoceras
    • †Moremanoceras scotti
  • †Morosaurus
    • †Morosaurus laticollis – type locality for species
  • †Morrolepis
    • †Morrolepis schaefferi – type locality for species
  • †Myledaphus
    • †Myledaphus bipartitus
  • Mounted fossilized skeleton of the Late Jurassic armored dinosaur Mymoorapelta
    †Mymoorapelta – type locality for genus
    • †Mymoorapelta maysi – type locality for species
  • Myrica
    • †Myrica torreyi
  • †Mytiloides
    • †Mytiloides duplicostatus – or unidentified related form
    • †Mytiloides latus – or unidentified comparable form
    • †Mytiloides mytiloides
    • †Mytiloides opalensis
    • †Mytiloides stantoni – or unidentified comparable form
    • †Mytiloides submytiloides – or unidentified related form

N
  • †Nanosaurus – type locality for genus
    • †Nanosaurus agilis – type locality for species
    • †Nanosaurus rex
  • Multiple views of a fossilized shell belonging to a Natica moon snail
    Natica
  • †Nemodon
    • †Nemodon adkinsi
    • †Nemodon harriesi – type locality for species
  • †Neocardioceras
    • †Neocardioceras densicostatum – type locality for species
    • †Neocardioceras juddii
    • †Neocardioceras laevigatum
    • †Neocardioceras minutum
    • †Neocardioceras uptonense
  • †Neocrioceras
  • †Neoptychites
    • †Neoptychites cephalotus
  • †Neurankylus
  • †Nigericeras
    • †Nigericeras scotti – type locality for species
  • †Nonactaeonina
    • †Nonactaeonina deflexa
    • †Nonactaeonina triticea
  • †Nortedelphys
    • †Nortedelphys jasoni
  • Restoration of several species of the Late Cretaceous ammonoid cephalopod Nostoceras
    †Nostoceras
    • †Nostoceras approximans – or unidentified comparable form
    • †Nostoceras larimerense – type locality for species
    • †Nostoceras monotuberculatum
    • †Nostoceras obtusum – or unidentified comparable form
    • †Nostoceras splendidum – or unidentified comparable form
  • Nucula
    • †Nucula percrassa
  • Nuculana
  • †Nymphalucina
    • †Nymphalucina bourni – type locality for species
    • †Nymphalucina cleburni

O
  • †Octopodichnus
  • †Odaxosaurus
    • †Odaxosaurus piger
  • †Oligoptycha
    • †Oligoptycha concinna
  • †Opertochasma
    • †Opertochasma cuneatum
  • †Opisthias
  • †Opisthotriton
    • †Opisthotriton kayi
  • †Ornitholestes – tentative report
  • †Ornithomimipus
    • †Ornithomimipus angustus – or unidentified comparable form
  • Fossilized skeleton of the Late Cretaceous ostrich dinosaur Ornithomimus
    †Ornithomimus – type locality for genus
    • †Ornithomimus velox – type locality for species
  • Ostrea
    • †Ostrea beloiti
    • †Ostrea subradiata
  • †Othnielia – tentative report
  • †Othnielosaurus
    • †Othnielosaurus consors
  • †Oxybeloceras
    • †Oxybeloceras crassum
  • †Oxytoma

P
  • Fossilized skull of the Late Cretaceous dome-headed dinosaur Pachycephalosaurus
    †Pachycephalosaurus
  • †Pachyrhizodus
    • †Pachyrhizodus minimus
  • †Palaeobalistum
  • †Palaeopteryx – type locality for genus
  • †Paleonelumbo
    • †Paleonelumbo macroloba
  • †Parabrontopodus – type locality for genus
    • †Parabrontopodus mcintoshi – type locality for species
  • †Parallelodon
  • †Paramacellodus
  • †Parapleurites
    • †Parapleurites morrisonensis – type locality for species
  • †Paressonodon – type locality for genus
    • †Paressonodon nelsoni – type locality for species
  • †Parikimys – type locality for genus
    • †Parikimys carpenteri – type locality for species
  • †Parviraptor
  • Life restoration of the Late Cretaceous horned dinosaur Pentaceratops
    †Pentaceratops
    • †Pentaceratops sternbergii
  • †Pentasauropus
  • †Petropteron – type locality for genus
    • †Petropteron mirandum – type locality for species
  • †Phelopteria
    • †Phelopteria linguaeformis
    • †Phelopteria ruppii – type locality for species
  • †Phlycticrioceras
    • †Phlycticrioceras trinodosus
  • †Pinna
  • †Placenticeras
  • †Plastomenus – tentative report
    • †Plastomenus insignis – type locality for species
    • †Plastomenus punctulatus – type locality for species
  • †Platanites
    • †Platanites marginata
  • Fossilized shell of the Cretaceous marine bivalve Platyceramus
    †Platyceramus
    • †Platyceramus ahsenensis
    • †Platyceramus cycloides
    • †Platyceramus mantelli - or unidentified loosely related form
    • †Platyceramus platinus
  • †Platyognathus
  • †Plesiobaena
    • †Plesiobaena antiqua – or unidentified comparable form
  • †Polyonax – type locality for genus
    • †Polyonax mortuarius – type locality for species
  • †Preprismatoolithus
    • †Preprismatoolithus coloradensis
  • †Priacodon
    • †Priacodon fruitaensis – type locality for species
  • †Prionocyclus
  • †Probaena
    • †Probaena sculpta – type locality for species
  • Fossilized skull of the Late Cretaceous mosasaur Prognathodon
    †Prognathodon
    • †Prognathodon overtoni
    • †Prognathodon stadtmani – type locality for species
  • Propeamussium
    • †Propeamussium simplicus
  • †Protalphadon
  • †Protexanites
    • †Protexanites shoshonensis
  • †Protocardia
    • †Protocardia barneyi – type locality for species
  • †Protocupressinoxylon
    • †Protocupressinoxylon medlynii – type locality for species
  • Life restoration of the Late Cretaceous bony fish Protosphyraena
    †Protosphyraena
  • Prunus
    • †Prunus corrugis
  • †Pseudaspidoceras
    • †Pseudaspidoceras collignoni
  • †Pseudobaculites
  • †Pseudocalycoceras
    • †Pseudocalycoceras angolaense
    • †Pseudocalycoceras dentonense
  • †Pseudoisurus
  • †Pseudoperna
    • †Pseudoperna bentonensis
    • †Pseudoperna congesta
    • †Pseudoperna inflatum – type locality for species
  • †Pseudotetrasauropus – tentative report
  • †Pteraichnus
  • Restoration of the Late Cretaceous shell-crushing shark Ptychodus with an anachronistic human to scale
    †Ptychodus
    • †Ptychodus anonymus
    • †Ptychodus decurrens
    • †Ptychodus occidentalis
    • †Ptychodus whipplei
  • †Puebloites
    • †Puebloites spiralis
  • Pycnodonte
    • †Pycnodonte newberryi

R
  • †Rhaeboceras
    • †Rhaeboceras coloradoense – type locality for species
    • †Rhaeboceras halli
    • †Rhaeboceras subglobosum
  • A living Rhinobatos guitar fish
    Rhinobatos
    • †Rhinobatos incertus
  • †Rhynchosauroides
  • †Rosselia
  • †Rotodactylus

S
  • †Sabalites
    • †Sabalites JC016 – informal
    • †Sabalites LA042 – informal
  • †Saurillodon
  • †Scapherpeton
    • †Scapherpeton tectum
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Scaphites
    †Scaphites
    • †Scaphites binneyi
    • †Scaphites depressus
    • †Scaphites hippocrepis – or unidentified comparable form
    • †Scaphites nodosus
  • †Schadipes – type locality for genus
    • †Schadipes crypticus – type locality for species
  • †Sciponoceras
    • †Sciponoceras gracile
  • †Scoyenia
  • †Selaginella
    • †Selaginella JC023 – informal
  • Fossilized skeleton of the Late Triassic-Early Jurassic bony fish Semionotus
    †Semionotus
  • †Solenoceras
    • †Solenoceras larimerense
    • †Solenoceras reesidei – or unidentified comparable form
    • †Solenoceras texanum
  • †Sphenodiscus
    • †Sphenodiscus pleurisepta
  • †Spiroxybeloceras
    • †Spiroxybeloceras meekanum
  • Squalicorax
    • †Squalicorax curvatus
    • †Squalicorax falcatus
    • †Squalicorax pristodontus
  • †Squatirhina
    • †Squatirhina americana
  • Restoration of the Late Jurassic stegosaur Stegosaurus
    †Stegosaurus – type locality for genus
    • †Stegosaurus armatus – type locality for species
    • †Stegosaurus stenops – type locality for species
    • †Stegosaurus ungulatus
  • †Steinerocaulis
    • †Steinerocaulis radiatus
  • †Stenomyti – type locality for genus
    • †Stenomyti huangae – type locality for species
  • †Stokesosaurus – or unidentified comparable form
  • †Stramentum
    • †Stramentum haworthi
  • Sulcoretusa
    • †Sulcoretusa dominici – type locality for species
  • †Sumitomoceras
    • †Sumitomoceras bentonianum
    • †Sumitomoceras conlini
  • Restoration in multiple views of the Late Jurassic sauropod dinosaur Supersaurus with an anachronistic human to scale
    †Supersaurus – type locality for genus
    • †Supersaurus vivianae – type locality for species
  • †Syncyclonema
    • †Syncyclonema travisanus
  • †Synorichthys – type locality for genus
    • †Synorichthys stewarti – type locality for species

T
  • †Tanaocrossus – type locality for genus
    • †Tanaocrossus kalliokoskii – type locality for species
  • †Tanocrossus
  • Tellina
  • †Tenea
    • †Tenea parilis
  • Teredo
    • †Teredo irregularis
  • †Texanites
    • †Texanites americanus
  • Fossilized skeleton of the Late Cretaceous plesiosaur Thalassomedon
    †Thalassomedon – type locality for genus
    • †Thalassomedon hanningtoni – type locality for species
  • †Theiophytalia – type locality for genus
    • †Theiophytalia kerri – type locality for species
  • †Therangospodus – or unidentified comparable form
  • †Thescelosaurus
  • †Tibiaporrhais
    • †Tibiaporrhais cooperensis
  • †Titanosaurus
    • †Titanosaurus montanus – type locality for species
  • Fossilized skulls of the Late Cretaceous horned dinosaurs Torosaurus (A) and Triceratops (B) to scale
    †Torosaurus
    • †Torosaurus latus
  • †Torvosaurus – type locality for genus
    • †Torvosaurus tanneri – type locality for species
  • †Trachybaculites
    • †Trachybaculites columna – or unidentified comparable form
  • †Treptichnus
  • †Triceratops
    • †Triceratops galeus – type locality for species
    • †Triceratops horridus
  • †Trinacromerum – or unidentified comparable form
  • Trochocyathus
    • †Trochocyathus egerius
  • †Turbinopsis
  • Turritella
  • †Turseodus
    • †Turseodus dolorensis – type locality for species
  • †Tylosaurus
    • †Tylosaurus proriger
  • Fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus
    †Tyrannosaurus
    • †Tyrannosaurus rex

V
  • †Vanikoropsis
    • †Vanikoropsis nebrascensis
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Vascoceras
    †Vascoceras
    • †Vascoceras birchbyi
  • Viviparus
    • †Viviparus reesidei
  • †Volviceramus
    • †Volviceramus grandis
    • †Volviceramus involutus
  • †Voysa

W
  • †Walteria – type locality for genus
    • †Walteria jeffersonensis – type locality for species
    • †Walteria jeffersoni – type locality for species
  • †Watinoceras
    • †Watinoceras coloradoense – type locality for species
  • †Websteria
    • †Websteria cretacea
  • †Worthoceras

X
  • †Xenoxylon
    • †Xenoxylon moorei – type locality for species
  • Life restoration of the Cretaceous bony fish Xiphactinus
    †Xiphactinus
    • †Xiphactinus audax

Z
  • †Zyziphus
    • †Zyziphus fibrillosus
    • †Zyziphus LA007 – informal
    • †Zyziphus LA032 – informal


gollark: If you have really low latency to the thing somehow, or giant amounts of repeats, it might be possible.
gollark: Although it is *mostly* likely to be too fast to observe much.
gollark: But generally you can get some idea of whether the first sections of some values match based on timing information if the thing is naively checking their equality.
gollark: Yes, I was just wrong and bad.
gollark: Don't proper password hashing algorithms make it take effectively the same time in some magic way.

References
  1. Neil H. Landman; W. James Kennedy; Neal L. Larson; Joyce C. Grier; James W. Grier; Tom Linn (2019). "Description of two species of Hoploscaphites (Ammonoidea, Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western Interior". Bulletin of the American Museum of Natural History. 427: 1–72. doi:10.1206/0003-0090.427.1.1. hdl:2246/6926.
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