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The Triassic period lasted from about 250 million years ago to about 200 million years ago and was a transitional period betwen the Paleozoic Era and Mesozoic Era. At the beginning of the Triassic, the world land masses were still joined as one in a formation we know as Pangea. By the end of the Triassic and the beginning of the Jurassic, Pangea had begun breaking up. The Triassic ended with a major extinction event that was especially severe on ocean species. The Triassic was especially transitional for life on Earth as many old species died out and newer species came into existence. While it wasn't until the extinction of the dinosaurs much, much later that mammals really flourished, it was at the very end of the Triassic that the first mammals began to appear. The Triassic was the beginning of the "Age of Reptiles."
