Geologists have discovered that a set of 28 footprints left behind by a reptile-like creature 310 million years ago are the oldest ever to be found in Grand Canyon National Park.
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Tiny footprints, big discovery: Reptile tracks oldest ever found in Grand Canyon
Geologists have discovered that a set of 28 footprints left behind by a reptile-like creature 310 million years ago are the oldest ever to be found in Grand Canyon National Park.
