When was the Triassic Period?
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Triassic Period

During the Triassic period (about 248 to 199 million years ago), most of Earth's land continued to stick together in one big supercontinent, Pangaea. Because the middle of Pangaea was so far from the oceans, it was very dry there, like a desert. The whole world was generally pretty warm all through the Triassic period. Even at the North and South poles, there wasn't any ice.

Because it was warm and dry, the older plants like giant ferns that needed wet ground for their spores to make new plants didn't do well in the Triassic. Most of the ferns died out, while the new pine trees took over as the main plants on Earth, even at the North and South poles. Ginko trees also developed, and possibly the first flowers.

The types of plants and animals were different in southern Pangaea than they were in the north. In the south, there were a lot of warm-blooded reptiles, but the north had more cold-blooded reptiles like the turtles that evolved about 215 million years ago. Throughout this period, the cold-blooded reptiles generally did better than the warm-blooded reptiles. But at the very end of the Triassic, about 200 million years ago, the warm-blooded reptiles evolved into the first flying reptiles - the pterodactyls - and others evolved into the first mammals. Another catastrophe that killed many types of plants and animals about this time (possibly because of big volcanic eruptions as Pangaea began to pull itself apart) marks the transition to the Jurassic period.

Learn by doing: go see a dinosaur skeleton in a museum
More about the Jurassic Era

Bibliography and further reading about the Triassic period and geology:

List of Geological Eras
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Professor Carr

Karen Eva Carr, PhD.
Assoc. Professor Emerita, History
Portland State University

Professor Carr holds a B.A. with high honors from Cornell University in classics and archaeology, and her M.A. and PhD. from the University of Michigan in Classical Art and Archaeology. She has excavated in Scotland, Cyprus, Greece, Israel, and Tunisia, and she has been teaching history to university students for a very long time.

Professor Carr's PSU page

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