Cooper Canyon Formation

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Cooper Canyon Formation
Stratigraphic range: Upper Triassic
TypeGeological formation
Unit ofDockum Group
UnderliesRedonda Formation
OverliesTrujillo Formation, possibly Camp Springs Formation and Colorado City Formation
CountryUnited States

The Cooper Canyon Formation is a geological formation of Norian age in Texas and New Mexico.[1][2]

Type area of the formation is situated in Garza County, Texas. An equivalent formation in eastern New Mexico is named Bull Canyon Formation. Some researchers argue that the latter name should be abandoned.[2]

The formation consist of reddish siltstone and mudstone with lenses of sandstone and conglomerate. Thickness of the formation in the type area is 161.5 meters. It increases to the south, and in some places exceeds 200 m. The formation contains diverse fossils, including vertebrate remains.[2]

Vertebrate fauna[edit]

Archosaurs of the Cooper Canyon Formation
Taxa Presence Notes Images


Desmatosuchus smalli

Partial skeletons


Two skeletons


Two partial skeletons


Numerous skeletons


Dentary and premaxilla.

Typothorax coccinarum

Numerous skeletons

See also[edit]


  1. ^ a b Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 518–521. ISBN 0-520-24209-2.
  2. ^ a b c Lehman T., Chatterjee S., Schnable J. (1992). "The Cooper Canyon Formation (Late Triassic) of western Texas". The Texas Journal of Science. 44 (3): 349–355.CS1 maint: Multiple names: authors list (link)