First unambiguous dinosaur specimen from the Upper Triassic Chinle formation in Utah

  • Xavier A. Jenkins College of Liberal Arts and Sciences, Arizona State University
  • John R. Foster Museum of Moab
  • Robert J. Gay Colorado Canyons Association

Abstract

Triassic dinosaurs represent relatively rare but important components of terrestrial faunas across Pangea. Whereas this record has been well studied at various locales across the American West, there has been no previous systematic review of Triassic material assigned to Dinosauria from Utah. Here, we critically examine the published body fossil and footprint record of Triassic dinosaurs from Utah and revise their record from the state. In addition, we describe a sacrum from a locality within the Upper Triassic Chinle Formation of southeastern Utah. _is specimen represents the only unambiguous Triassic dinosaur body fossil from Utah. MWC 5627 falls within the range of variation known for sacrum morphology from Coelophysis bauri. Based on a literature review and examination of specimens available to us, we restrict the Triassic Utah dinosaurian record to _eropoda from the Chinle Formation. Preliminary reports of Triassic dinosaurs from other clades and formations in Utah are unsubstantiated.
Published
Dec 13, 2017
How to Cite
JENKINS, Xavier A.; FOSTER, John R.; GAY, Robert J.. First unambiguous dinosaur specimen from the Upper Triassic Chinle formation in Utah. Geology of the Intermountain West, [S.l.], v. 4, p. 231-242, dec. 2017. ISSN 2380-7601. Available at: <https://utahgeology.org/openjournal/index.php/GIW/article/view/22>. Date accessed: 17 feb. 2018.

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