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.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2018/11/181108142448.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2018/11/181108142448.htm
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