Abstract

ABSTRACT Skull material of the prosauropod dinosaur Massospondylus, previously known only from Africa, has been found in the Kayenta Formation (Glen Canyon Group) of northeastern Arizona. A reconstruction of the skull, corrected for distortion, is compared with that of Plateosaurus. The dentition provides evidence for an herbivorous diet in prosauropods; the presence of small palatal teeth is reported for the first time in any dinosaur. The associated fauna is related to faunas from the Elliot and Clarens sandstone formations in southern Africa, and an Early Jurassic (rather than Late Triassic) age is accepted for these formations as well as for the Kayenta Formation.

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