Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era .
Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms during the Mesozoic Era. The seas became inhabited by large marine reptiles. On land, ancestral forms of various modern amphibians arose, as did reptiles such as turtles and crocodilians. By the Late Triassic, archosaur s were becoming more and more dominant, and the first true mammals, small shrewlike omnivores, evolved. Seed ferns dominated the flora of southern Gondwana , and gymnosperm s, including conifers, cycads, and ginkgos, were common throughout much of Pangea .