Colorado City Formation
The Colorado City Formation is a geologic formation in Texas. It preserves fossils dating back to the Triassic period.
| Colorado City Formation Stratigraphic range: Late Triassic | |
|---|---|
| Type | Formation |
| Unit of | Dockum Group |
| Underlies | possibly Cooper Canyon Formation |
| Overlies | Camp Springs Formation |
| Location | |
| Region | Texas |
| Country | United States |
Biochronological significance
The Otis Chalk localities that are situated in the Colorado City Formation form the basis of the Otischalkian Land Vertebrate Faunachron (LVF), which is defined by the first appearance of Parasuchus.[1]
Vertebrate fauna
| Archosaurs of the Cooper Canyon Formation | ||||
|---|---|---|---|---|
| Taxa | Material | Notes | Images | |
|
Based on two skeletons |
A typothoracisine aetosaur |
|||
|
A metoposaurid | ||||
|
A skull |
A member of Latiscopidae | |||
|
Tibia, fibula, astragalus |
A coelophysid | |||
|
A skeleton |
A member of Allokotosauria; regarded as a synonym of Trilophosaurus buettneri by Spielmann et al. (2006)[2] | |||
|
Humerus |
A rhynchosaur | |||
|
Based on a skull |
A basal parasuchian | |||
|
Numerous skulls |
A basal parasuchian | |||
|
Numerous skulls and skeletons |
A trilophosaurid | |||
References
- Lucas, S. G., Hunt, A. P., Heckert, A. B., and Spielmann, J. A., (2007) Global Triassic tetrapod biostratigraphy and biochronology: 2007 status: New Mexico Museum of Natural History and Science Bulletin, v. 41 (The Global Triassic), p. 229- 240.
- Spielmann, J.A., Lucas, S.G., Hunt, A.P., and Heckert. 2006. Reinterpretation of the holotype of Malerisaurus langstoni, a diapsid reptile from the Upper Triassic Chinle Group of West Texas. The Triassic-Jurassic Terrestrial Transition. New Mexico Museum of Natural History and Science, Bulletin 37:543-547.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
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