Though it was underwater just 12,000 years ago, White Sands National Park — now an arid desert landscape ... Among those ...

the footprints had previously been mistaken for fish resting burrows. Blakesley explained that this was due to the fact that there would have only been a thin layer of sand on top of a much harder ...

The vast expanses of sand and constantly shifting winds ... READ MORE: Archaeologists uncover 115,000 year old human footprints in Saudi Arabia desert READ MORE: Discovery of best-preserved ...