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Cliff Collapses At Grand Canyon, Scientists Celebrate

A Tetrapod

Cliff Collapses At Grand Canyon, Scientists Celebrate

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The animal that had left the footprints was a tetrapod that had walked the landscape when the piece of rock he was looking at was still just a desert. The tetrapod in question was a diadectomorph – an early amphibian that resembles a lizard.

But the stranger’s question was why was it there?

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