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The Newtonsaurus was a dinosaur which is believed to have lived in the late Triassic period. It is not yet described by any scientist and hence its existence is considered dubious. Its remains were discovered in the year 1899 and were classified under a different existing genus.
The earliest dinosaurs lived in the region of the supercontinent Pangea corresponding to modern-day South America. Until recently, the most famous of these creatures were the relatively large (about 400 pounds) Herrerasaurus and the medium-sized (about 75 pounds) Staurikosaurus, both of which date to about 230 million years ago.