The early fossil record of dinosaurs in North America: A new neotheropod from the base of the Upper Triassic Dockum Group of Texas

NESBITT, S. J.; EZCURRA, M. D.

ACTA PALAEONTOLOGICA POLONICA

INST PALEOBIOLOGII PAN

Lugar: Varsovia; Año: 2015 vol. 60 p. 513 - 526

0567-7920

The dinosaur record from the stratigraphically-lowest portions of Upper Triassic deposits of western North America ispoor and only consists of a handful of fragmentary hind limb elements. Here we present an articulated segment of theankle 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. Usingthe most comprehensive analysis of early theropod relationships currently available, we determined that the newspecimen pertains to a coelophysoid neotheropod (i.e., more closely related to Coelophysis bauri than to Allosaurusfragilis). The stratigraphic position of the locality where the new specimen was discovered is equivalent to the famousOtis Chalk localities and this set of localities likely predates the rest of the Dockum Group and possibly the entirety ofthe fossiliferous portion of the Chinle Formation on the Colorado Plateau. Therefore, the new specimen represents one ofthe oldest neotheropods. Accordingly, neotheropods were present at or just after the onset of both the Chinle Formationand Dockum Group deposits.