Early Jurassic Newark Supergroup from the Dinosaur Collector

   update 102912

The Newark Super-Group includes all continental sedimentation and extrusive volcanic rocks extending over large areas of eastern North America and covering the time period from the mid Triassic to early Jurassic. Until recently little in the way of fossils had been found except for footprints, but new finds from a number of localities have changed that picture.  The prosauropod grade sauropodomorphs Ammosaurus and Anchisaurus and the coelophysoids Podokesaurus are know from fossils. Fossil trackways indicate there were small and large theropods, sauropods and small ornithischians.

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Anchisaurus was a small basal sauropodomorph with short feet and sturdy limbs. It had more teeth than Thecodontosaurus, and distinctive vertebrae and hip bones. Large claws were present on its thumbs. The estimated size is 4 m (13 ft). Ammosaurus major, is genrally considered a junior synonym of Anchisaurus.

Podokesaurus is a small theropod and is probably a juvenile related to Coelophysis.