Colorado City Formation

Colorado City Formation
Stratigraphic range: Late Triassic
TypeFormation
Unit ofDockum Group
Underliespossibly Cooper Canyon Formation
OverliesCamp Springs Formation
Location
RegionTexas
CountryUnited States

The Colorado City Formation is a geologic formation in Texas. It preserves fossils dating back to the Triassic period.

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

Coahomasuchus chathamensis

Based on two skeletons

A typothoracisine aetosaur

Koskinonodon

A metoposaurid

Latiscopus

A skull

A member of Latiscopidae

Lepidus

Tibia, fibula, astragalus

A coelophysid

Malerisaurus langstoni

A skeleton

A member of Allokotosauria; regarded as a synonym of Trilophosaurus buettneri by Spielmann et al. (2006)[2]

Otischalkia

Humerus

A rhynchosaur

"Paleorhinus" sawini

Based on a skull

A basal parasuchian

Parasuchus bransomi

Numerous skulls

A basal parasuchian

Trilophosaurus buettneri

Numerous skulls and skeletons

A trilophosaurid

See also

References

  1. ^ 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.
  2. ^ 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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