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.
from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity
The first of the three periods of the Mesozoic Era, lasting from about 225 million to 190 million years ago.
the first period of the Mesozoic Era (It lasted from 225-200 million years ago. Dinosaurs first appeared here.)
The first period of the Mesozoic Era between 225 and 185 million years ago. Pangaea began to breakup during this time. The ancestors of dinosaurs were present, as were early mammals and mammal-like reptiles. PICTURE
first period of the Mesozoic Era; time period when dinosaurs first evolved; "Triassic" comes from Latin, "trias" describing three particular rock layers in Germany
Between 248 and 206 million years ago. Period characterized by the appearance of the first dinosaurs and mammals on earth.
Dinosaurs and mammals evolved during the Triassic period, 245 - 208 million years ago.
