Fort Crittenden Formation

Fort Crittenden Formation Stratigraphic range: Late Cretaceous
Type	Geological formation
Underlies	Salero Formation
Location
Region	North America
Country	USA

The Fort Crittenden Formation is a geological formation in Arizona whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.^[1]

Vertebrate paleofauna

Amphibians

Amphibians of the Fort Crittenden Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes
Opisthotriton	Indeterminate
Scapherpeton	Indeterminate

Archosaurs

Archosaurs of the Fort Crittenden Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Allognathosuchus	Indeterminate			Known only from a single scute.	Paleontologists Robert M. Sullivan and Spencer G. Lucas question the presence of Allognathosuchus in the formation because the referred remains were so scant and Allognathosuchus has never been reported in Cretaceous strata previously. They regard the referred scute as belonging to an indeterminate alligatoroid.
Hadrosauridae[1][2]	Indeterminate[1]
Gorgosaurus
Richardoestesia	Indeterminate
Saurornitholestes	Indeterminate

Bony fishes

Bony fishes of the Fort Crittenden Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Melvius	Indeterminate					Pachyrhizodus
Pachyrhizodus	Indeterminate

Cartilaginous fishes

Cartilaginous fishes of the Fort Crittenden Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes
Myledaphus	M. bipartitus

Lepidosaurs

Teiid and anguid lizards are known from the formation.

Turtles

Turtles of the Fort Crittenden Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes
Adocus
Aspideretes
Basilemys
Plastomenus

See also

• List of dinosaur-bearing rock formations

Footnotes

1. Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
2. D’Emic, M.D., Wilson, J.A., and Thompson, R. 2010. The end of the sauropod dinosaur hiatus in North America. Paleogeography, Paleoclimatology, Paleoecology 297: 486– 490.

References

• Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.
• Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.