Each year 500,000 people visit New Mexico’s White Sands National Monument to hike and frolic among gypsum dunes. This survey revealed the first collection of human tracks: 27 individual footprints that vanished into a dune. Yet National Park Service paleontologists struggled to determine the age of the human prints using geologic techniques like carbon dating. They are at least 11,000 years old, as ancient as the last ground sloth. This evidence of an interaction between human and extinct giant sloth is “unique in the world,” Belvedere said.

Source: National Post April 26, 2018 17:48 UTC