Fallen Boulder at the Grand Canyon Reveals Prehistoric Reptile Footprints

 

Fallen Boulder at the Grand Canyon Reveals Prehistoric Reptile Footprints

313 million years ago, two reptilian creatures crept over this boulder’s surface  #Archaeology


A large chunk of reddish rock with a series of indentations, starting in the lower righthand side and moving up diagonally across the rock's surface. A person holds a black-and-white stick next to the boulder for scale.

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