Fallen Boulder Reveals 313 Million-Year-Old Fossil Footprints At Grand Canyon

The two sets of footprints "are among the oldest tracks on Earth of shelled-egg-laying animals, such as reptiles, and the earliest evidence of vertebrate animals walking in sand dunes," paleontologist Stephen Rowland said.

The side-by-side tracks of two ancient animals have been called “by far the oldest vertebrate tracks in Grand Canyon.”

(Image credit: U.S. National Park Service/U.S. National Park Service)

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