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The layers of the Chinle Formation have also yielded fossils of armored aetosaurs which look like dinosaurs, but aren't. These creatures dominated the world 225 million years ago, but died out in a mass extinction at the end of the Triassic, clearing the way for the rise of the dinosaurs.

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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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