Evolution of the Dinosaurs

Dinosaurs First Appear

What were early archosaurs like?

One of the first archosaurs—and probably typical of many archosaurs—was the big-headed Shansisuchus, a Middle Triassic period creature that lived in what is now China about 220 million years ago. It was about 7 feet (2.2 meters) long and had long back legs and short front legs.


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