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Ammosaurus(pronounced AM-uh-SAWR-us) Ammosaurus (meaning "sandy-ground lizard") was a large, long-necked, small-headed, quadrupedal, plant-eating plateosaurid prosauropod dinosaur from the early Jurassic period, about 198 million to 187 million years ago. It had a bulky body, small feet, big hands with thumb claws and a long tail. It was about 14 feet (4 m) long, weighing roughly 290 kg. Four incomplete skeletons (juvenile & adult) have been found in Connecticut, Arizona, USA, and perhaps Nova Scotia, Canada. Ammosaurus was named by paleontologist O. Marsh in 1891.