A geologist has discovered a pair of fossil footprints that researchers say are the oldest of their kind in the Grand Canyon — dating back 313 million years.
slope of a sand dune., was hiking along a trail with a group of students in 2016 when he came across a fallen boulder containing the markings, according to a National Park Service news release.
After extensive research, Rowland called the discovery"by far the oldest vertebrate tracks in Grand Canyon." One of the features scientists noticed was the distinct gait of the ancient tetrapods, called a lateral-sequence walk. That's when the legs on one side of the animal move in succession, the rear leg and then the foreleg, alternating with the opposite side.
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