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A taxonomic and biostratigraphic re-evaluation of the Post Quarry vertebrate assemblage from the Cooper Canyon Formation (Dockum Group, Upper Triassic) of southern Garza County, western Texas

Published online by Cambridge University Press:  23 September 2013

Jeffrey W. Martz
Affiliation:
Department of Earth Sciences, Denver Museum of Nature and Science, Denver, CO 80205, USA. Email: typothorax@gmail.com
Bill Mueller
Affiliation:
Museum of Texas Tech University, Lubbock, TX 79409, USA
Sterling J. Nesbitt
Affiliation:
Department of Biology, University of Washington, Seattle, WA 98195-1800, USA
Michelle R. Stocker
Affiliation:
Department of Geological Sciences, The University of Texas at Austin, Austin, TX 78712, USA
William G. Parker
Affiliation:
Department of Geological Sciences, The University of Texas at Austin, Austin, TX 78712, USA Division of Resource Management, Petrified Forest National Park, P.O. Box 2217, Petrified Forest, AZ 86028, USA
Momchil Atanassov
Affiliation:
Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
Nicholas Fraser
Affiliation:
National Museums Scotland, Chambers Street, Edinburgh EH1 1JF, UK
Jonathan Weinbaum
Affiliation:
Biology Department, Southern Connecticut State University, New Haven, CT 06515, USA
James R. Lehane
Affiliation:
Department of Geology & Geophysics, University of Utah, Salt Lake City, UT 84112, USA
Corresponding
E-mail address:

Abstract

The Post Quarry, within the lower part of the type section of the Upper Triassic Cooper Canyon Formation in southern Garza County, western Texas, contains a remarkably diverse vertebrate assemblage. The Post Quarry has produced: the small temnospondyl Rileymillerus cosgriffi; the metoposaurid Apachesaurus gregorii; possible dicynodonts and eucynodonts; a clevosaurid sphenodontian; non-archosauriform archosauromorphs (Trilophosaurus dornorum, simiosaurians, and possibly Malerisaurus); the phytosaur Leptosuchus; several aetosaurs (Calyptosuchus wellesi, Typothorax coccinarum, Paratypothorax, and Desmatosuchus smalli); the poposauroid Shuvosaurus inexpectatus (“Chatterjeea elegans”); the rauisuchid Postosuchus kirkpatricki; an early crocodylomorph; several dinosauromorphs (the lagerpetid Dromomeron gregorii, the silesaurid Technosaurus smalli, a herrerasaurid, and an early neotheropod); and several enigmatic small diapsids. Revised lithostratigraphic correlations of the lower Cooper Canyon Formation with the Tecovas Formation, the occurrence of Leptosuchus, and the overall composition of the assemblage indicate that the Post Quarry falls within the Adamanian biozone, and not the Revueltian biozone. Stratigraphic subdivision of the Adamanian biozone may be possible, and the Post Quarry may be correlative with the upper part of the Adamanian biozone in Arizona. The age of the Post Quarry assemblage is possibly late Lacian or earliest Alaunian (late early Norian or earliest middle Norian), between 220 and 215 Ma.

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