Journal
ACTA PALAEONTOLOGICA POLONICA
Volume 60, Issue 3, Pages 513-526Publisher
INST PALEOBIOLOGII PAN
DOI: 10.4202/app.00143.2014
Keywords
Dinosauria; Archosauria; Neotheropoda; phylogeny; Norian; Otis Chalk; North America
Categories
Funding
- DFG Emmy Noether Programme [BU 2587/3-1]
- National Science Foundation EAR [1349667]
- Virginia Tech
- Division Of Earth Sciences
- Directorate For Geosciences [1349667] Funding Source: National Science Foundation
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The dinosaur record from the stratigraphically-lowest portions of Upper Triassic deposits of western North America is poor and only consists of a handful of fragmentary hind limb elements. Here we present an articulated segment of the ankle region of a dinosaur that consists of the distal ends of the tibia and fibula and a complete astragalocalcaneum. Additionally, we suggest that an isolated femur and maxilla from the same locality may belong to the same taxon. Using the most comprehensive analysis of early theropod relationships currently available, we determined that the new specimen pertains to a coelophysoid neotheropod (i.e., more closely related to Coelophysis bauri than to Allosaurus fragilis). The stratigraphic position of the locality where the new specimen was discovered is equivalent to the famous Otis Chalk localities and this set of localities likely predates the rest of the Dockum Group and possibly the entirety of the fossiliferous portion of the Chinle Formation on the Colorado Plateau. Therefore, the new specimen represents one of the oldest neotheropods. Accordingly, neotheropods were present at or just after the onset of both the Chinle Formation and Dockum Group deposits.
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