0 from or referring to the period of time between around 245 and 208 million years ago, in which dinosaurs (= large reptiles that no longer exist) first appeared: --
1 the Triassic period (= between around 245 and 208 million years ago): --
By the end of the Triassic, the dinosaurs were the dominant herbivores worldwide.
At the beginning of the Triassic, the dominant land animals were the mammal-like reptiles.
A primitive dinosaur skeleton from Upper Triassic strata was discovered in northwestern Argentina.
Triassic strata under the Cumberland Plain are thicker than in the west.
The plants at least only showed significant changes with the rifting of the plates in later Triassic times.