Fort Crittenden Formation
Late Cretaceous geological formation in Arizona
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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 | |
|
Indeterminate |
||||||
|
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. |
 | ||
| These teeth were attributed to Trachodon mirabilis in the past. | ||||||
|
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 |
|
Indeterminate |
 | |||||
|
Indeterminate |
||||||
Cartilaginous fishes
| Cartilaginous fishes of the Fort Crittenden Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
|
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 | |
