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The layers of the Chinle Formation have also yielded fossils of Rauisuchia, which look like dinosaurs, but aren't. Scientists most credit a global outpouring of volcanos for the end-Triassic extinction 200 million years ago. Some 65 million years ago, scientists think a giant asteroid played a key role in a mass extinction that wiped out the dinosaurs -- clearing the way for the dominance of mammals

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The Jaws of Extinction

Petrified Forest lays reveals violent past to a warm-blooded pair of survivors

The wind blew. The planet spun. The light faded And all the while I stood pondering fate on a ridge above the crystallized corpse of a lost world on a ridge in the Petrified National Forest.

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