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Oldest known footprints in the Grand Canyon found

Oldest known footprints in the Grand Canyon found

National Geographic - Michael Greshko

Exposed by a rockfall, the oddly angled tracks offer a rare glimpse into early animal behavior. About 310 million years ago in what's now Arizona, a primitive creature trundled along on all fours through towering sand dunes that spilled into the sea. Normally, this creature's tracks would have …

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