Cooper Canyon Formation

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

Cooper Canyon Formation
Stratigraphic range:
TypeGeological formation
Unit ofDockum Group
UnderliesRedonda Formation
OverliesTrujillo Formation, possibly Camp Springs Formation and Colorado City Formation
Location
Coordinates33.127°N 101.366°W / 33.127; -101.366
Region Texas
 New Mexico
Country United States
Cooper Canyon Formation (the United States)
Cooper Canyon Formation (Texas)

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

Temnospondyls
Taxa Presence Notes Images

Anaschisma bakeri[3]

Allokotosaurs
Taxa Presence Notes

Trilophosaurus

 species T. jacobsi and T. buettneri
Malerisaurus sp.
Archosaurs of the Cooper Canyon Formation
Taxa Presence Notes Images

Chindesaurus
Coelophysis sp.[4]

Desmatosuchus smalli

Partial skeletons

Doswellia kaltenbachi
Dromomeron
Machaeroprosopus lottorum[5]
Paleorhinus

Postosuchus

Two skeletons

Protoavis

Two partial skeletons

Scutarx

Numerous skeletons

Stagonolepis

Technosaurus[1]

Dentary and premaxilla.

Typothorax coccinarum[5]

Numerous skeletons

Wannia

Procolophonomorphs
Taxa Presence Notes

Libognathus sheddi[6]

Misc.
Taxa Presence Notes
Dicynodontia ident.[3]
Sphenodontia ident.
Pteromimus longicollis
Procoelosaurus brevicollis
Bivalvia ident.

See also

References
  1. 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. 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. Martz, J.W. (2008). Lithostratigraphy, chemostratigraphy, and vertebrate biostratigraphy of the Dockum Group (Upper Triassic), of southern Garza County, West Texas (unpublished PhD thesis). Texas Tech University. Retrieved 16 November 2021.
  4. Lehman, Thomas; Chatterjee, Sankar (June 2005). "Depositional setting and vertebrate biostratigraphy of the Triassic Dockum Group of Texas". Journal of Earth System Science. 114 (3): 325–351. Bibcode:2005JESS..114..325L. doi:10.1007/BF02702953. S2CID 128760266.
  5. Hungerbühler, Axel; Mueller, Bill; Chatterjee, Sankar; Cunningham, Douglas P. (September 2012). "Cranial anatomy of the Late Triassic phytosaur Machaeroprosopus , with the description of a new species from West Texas". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 103 (3–4): 269–312. doi:10.1017/S1755691013000364. S2CID 129442164.
  6. Small, Bryan J. (15 December 1997). "A new procolophonid from the Upper Triassic of Texas, with a description of tooth replacement and implantation". Journal of Vertebrate Paleontology. 17 (4): 674–678. doi:10.1080/02724634.1997.10011016.
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