<P> This is a list of dinosaurs whose remains have been recovered from North America . North America has a rich dinosaur fossil record with great diversity of dinosaurs . </P> <P> The earliest record of dinosaurs in North America comes from rare, unidentified (possibly theropod) footprints and teeth in the Middle - Late Triassic Pekin Formation of North Carolina . Later in the Triassic period, dinosaurs left more recognizable remains, and could thus be identified as specific genera . Examples of later Triassic North American dinosaur genera include Coelophysis, Chindesaurus, Gojirasaurus, and Tawa . Fossils of Tawa have also been found in South America, which has important indications about paleogeography . During the Early Jurassic Period, dinosaurs such as Dilophosaurus, Anchisaurus, Megapnosaurus (formerly known as Syntarsus), and the early thyreophoran Scutellosaurus lived in North America . The latter is believed to have been the ancestor of all stegosaurs and ankylosaurs . The Middle Jurassic is the only poorly represented time period in North America, although several Middle Jurassic localities are known from Mexico . Footprints, eggshells, teeth, and fragments of bone representing theropods, sauropods, and ornithopods have been found, but none of them are diagnostic to the genus level . </P>

Where did dinosaurs roam in the united states