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Theropod dinosaurs and the Early Jurassic age of the Moenave Formation, Arizona-Utah, USA

Describes fossils from the Lower Jurassic of Arizona that may belong to Syntarsus.

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Abstract

Two theropod dinosaur pelvic regions from the Dinosaur Canyon Member of the Moenave Formation in northeastern Arizona are assigned to Syntarsus sp. Tetrapod fossils from the Moenave Formation, especially the crocodylomorph Protosuchus and the ichnotaxon Eubrontes, indicate it is entirely of Early Jurassic (Hettangian) age. The Moenave Formation thus contains one of a handful of Hettangian-age tetrapod assemblages known worldwide.