Fort Crittenden 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]

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

Vertebrate paleofauna

Amphibians

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

Archosaurs

Tyrannosauridae fossils attributed to Gorgosaurus have been unearthed here.^[2][3]

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.	Crittendenceratops
Hadrosauridae[1][4][5][6]	Indeterminate[1][6]				These teeth were attributed to Trachodon mirabilis in the past.
Crittendenceratops	C. krzyzanowskii[7]		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
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

• Earth sciences portal
• Paleontology portal
• Dinosaurs portal

• List of dinosaur-bearing rock formations