The ancient environment preserved this creature's footprints in a fossilized trackway that researchers are calling Chelichnus gigas. That's because like many four-legged (or tetrapodal) animals, this ancient critter's back feet would have stepped directly on top of the freshly made footprints of its front feet, meaning that the front footprints are obscured by the back ones, said study lead researcher Stephen Rowland, a professor of geology at the University of Nevada, Las Vegas. "The hind footprints are superimposed on the front footprints, so we don't have well-preserved front footprints," Rowland told Live Science.
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