Pterodactyl in pewter supplied on a waxed cord. The information on the reverse of the card is about flying reptiles. Dinosaurs, a type of Archosaur reptile, were the dominant land animals of the Mesozoic era. Over 500 different genera of dinosaurs have been found. Fossils of dinosaurs have been found on every continent, and there are still frequent new discoveries. Dinosaurs appeared in the Upper Triassic, about 231 million years ago. By the early Jurassic they were the top land vertebrates, and dominated most environments on land. They continued until the sudden K/T extinction event 66 million years ago. Birds are the descendants of theropod dinosaurs; all the terrestrial dinosaurs are extinct.
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