Fossil footprints from 313 million years ago are the oldest to ever be found in the Grand Canyon.
A geology professor from Norway, Allan Krill, made the surprising discovery four years ago on a hike with students.
Lying next to the trail, in plain view of the many hikers, was a boulder containing conspicuous fossil footprints, National Park Service officials said this week in announcing the discovery.
An intrigued Krill snapped a photo and sent it to a colleague, Stephen Rowland, a paleontologist at the University of Nevada Las Vegas.

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