Fort Crittenden Formation Explained

Fort Crittenden Formation
Type:	Geological formation
Age:	Late Cretaceous
Region:	North America
Country:	United States
Underlies:	Salero Formation

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	Images -->
Opisthotriton	Indeterminate					-->
Scapherpeton	Indeterminate

Archosaurs

Archosaurs of the Fort Crittenden Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Alligatoridae	Indeterminate			Known only from a single scute.	Paleontologists Robert M. Sullivan and Spencer G. Lucas questioned the referral to this specimen to Allognathosuchus in the formation because the referred remains were so scant and Allognathosuchus is confined to the Paleogene. They regarded the referred scute as belonging to an indeterminate alligatoroid.
Hadrosauridae^[2]	Indeterminate
Crittendenceratops	C. krzyzanowskii^[3]		A centrosaurine ceratopsid.
cf. Richardoestesia	Indeterminate
Dromaeosauridae	Indeterminate

Bony fishes

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

Lepidosaurs

Teiid and anguid lizards are known from the formation.

Turtles

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

See also

• List of dinosaur-bearing rock formations

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. .

Notes and References

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. 574–88. .
2. D’Emic, M.D., Wilson, J.A., and Thompson, R. 2010. "The end of the sauropod dinosaur hiatus in North America". Palaeogeography, Palaeoclimatology, Palaeoecology 297: 486–90.
3. Sebastian G. Dalman; John-Paul M. Hodnett; Asher J. Lichtig; Spencer G. Lucas (2018). "A new ceratopsid dinosaur (Centrosaurinae: Nasutoceratopsini) from the Fort Crittenden Formation, Upper Cretaceous (Campanian) of Arizona". New Mexico Museum of Natural History and Science Bulletin. 79: 141–64.