Definitions for "TRIASSIC PERIOD"
Keywords:  dinosaurs, mesozoic, ago, era, mammal
a period of time that began 245 million years ago and ending 208 million years ago.
Time interval in the geologic time scale spanning from about 245 to 206 million years ago. Dinosaurs had evolved from archosaur ancestors by the latter part of this period, including the clades Theropoda and Sauropodomorpha. Tridactyl Three-toed track or foot, often affiliated with either theropods or most ornithopods, (especially hadrosaurids).
A geological period that lasted from 250-206 million years ago.