Genus

Valid Extinct

Kritosaurus

Brown 1910

Kritosaurus is an incompletely known genus of hadrosaurid (duck-billed) dinosaur. It lived about 74.5-66 million years ago, in the Late Cretaceous of North America. The name means "separated lizard", but is often mistranslated as "noble lizard" in reference to the presumed "Roman nose".

Temporal range

Triassic

Jurassic

Cretaceous

Paleogene

Neogene

252 201 145 66 0 Ma

PBDB occurrences

Group

Dinosaures

Herbivore Ground dwelling, gregarious Terrestrial

click to enlarge

Kritosaurus navajovius skull © Ryan Somma · CC BY-SA 2.0 · Wikimedia

PBDB ↗ Wikipedia ↗

Classification

Dinosauria Unranked clade

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Ornithischia Unranked clade

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Neornithischia Unranked clade

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Pyrodontia Unranked clade

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Cerapoda Unranked clade

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Ornithopoda Suborder

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Iguanodontia Infraorder

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Euiguanodontia Unranked clade

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Dryomorpha Unranked clade

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Ankylopollexia Unranked clade

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Styracosterna Unranked clade

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Hadrosauriformes Unranked clade

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Hadrosauroidea Unranked clade

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Hadrosauridae Family

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Hadrosaurinae Subfamily

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Kritosaurini Tribe

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Kritosaurus Genus

Fossil sites 25 geolocated sites

Distribution

Top countries

🇺🇸 United States

🇨🇦 Canada

Geological formations

Kirtland

Fruitland

Fruitland/Kirtland

Aguja

Milk River

Javelina

Judith River

Temporal distribution

Maastrichtian (72.2–66 Ma)

Campanian (83.6–72.2 Ma)

Santonian (85.7–83.6 Ma)

Species (2)

Kritosaurus horneri

Kritosaurus navajovius 84 Ma

Bibliography

Original description

B. Brown. 1910. The Cretaceous Ojo Alamo beds of New Mexico with description of the new dinosaur genus <i>Kritosaurus</i>. Bulletin of the American Museum of Natural History 28(24):267-274

Bibliography (10)

T. M. Lehman, S. L. Wick, and J. R. Wagner. 2016. Hadrosaurian dinosaurs from the Maastrichtian Javelina Formation, Big Bend National Park, Texas. Journal of Paleontology 90(2):333-356 DOI ↗

R. M. Sullivan and S. G. Lucas. 2014. Stratigraphic distribution of hadrosaurids in the Upper Cretaceous Fruitland, Kirtland, and Ojo Alamo formations, San Juan Basin, New Mexico. Hadrosaurs

S. G. Lucas, N. J. Mateer, and A. P. Hunt, F. M. O.'Neill. 1987. Dinosaurs, the age of the Fruitland and Kirtland Formations, and the Cretaceous-Tertiary boundary in the San Juan Basin, New Mexico. J. E. Fassett and J. K. Rigby, Jr. (eds.), The Cretaceous-Tertiary Boundary in the San Juan and Raton Basins, New Mexico and Colorado, Geological Society of America Special Paper 209:35-50 DOI ↗

K. L. Davies. 1983. Hadrosaurian Dinosaurs of Big Bend National Park, Brewster County, Texas.

J. G. Armstrong-Ziegler. 1978. An aniliid snake and associated vertebrates from the Campanian of New Mexico. Journal of Paleontology 52(2):480-483

B. S. Kues, J. W. Froehlich, and J. A. Schiebout, S. G. Lucas. 1977. Paleontological survey, resource assessment, and mitigation plan for the Bisti-Star Lake Area, northwestern New Mexico. Report to the Bureau of Land Management, Albuquerque, New Mexico

R. S. Lull and N. E. Wright. 1942. Hadrosaurian dinosaurs of North America. Geological Society of America Special Paper 40:1-242 DOI ↗

L. S. Russell. 1935. Fauna of the upper Milk River Beds, southern Alberta. Transactions of the Royal Society of Canada, series 3 4(29):115-128

C. W. Gilmore. 1916. Contributions to the geology and paleontology of San Juan County, New Mexico. 2. Vertebrate faunas of the Ojo Alamo, Kirtland and Fruitland Formations. United States Geological Survey Professional Paper 98-Q:279-302 DOI ↗

B. Brown. 1910. The Cretaceous Ojo Alamo beds of New Mexico with description of the new dinosaur genus <i>Kritosaurus</i>. Bulletin of the American Museum of Natural History 28(24):267-274