Every year, hordes of tourists descend on Grand Canyon to enjoy the natural beauty of this geological wonder. But many tourists hiking the popular Bright Angel Trail missed something very interesting—a series of fossilized footprints preserved in a boulder, lying next to the trail, that had broken off a cliff in the nearby Manakacha Formation. But in 2016, a geology professor hiking with his students noticed the footprints, and now research on these tracks has been released.

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