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Dinosaur and Pterosaur tracks in the Summerville and Bluff (Jurassic) beds of eastern Utah and northeastern Arizona

- Reexamination of the Pteraichnus (pterosaur tracks) type locality in the Four Corners area reveals abundant theropod and brontosaur tracks in the uppermost part of the Bluff sandstone (Recapture Member). These are the first dinosaur tracks reported from these units in this area, and include the theropod track Megalosauripus, which is also found in the Summerville near Chama, New Mexico, the Summerville Bluff transition zone near Blanding, Utah, and the transition zone between the Moab Tongue of the Entrada and the "upper tongue'' of the Summerville in the Moab area, Utah. The widespread theropod track assemblage in this facies and widespread distribution of pterosaur tracks in the upper part of the Summerville Formation and correlative pre-Salt Wash beds adds much to our knowledge of a sequence that was previously regarded as completely unfossiliferous, and helps shed light on debates about regional strati graphic correlation.