"New Mexico's Ancient Footprints Rewrite Early Human History in North America"

Fossilized footprints found at White Sands National Park in New Mexico, initially dated using radiocarbon dating, have been confirmed to be 21,000 to 23,000 years old through multiple lines of evidence. Concerns about the accuracy of the original dating method were addressed by using radiocarbon dating of conifer pollen and optically stimulated luminescence. The results provide strong support for the presence of humans in North America during the Last Glacial Maximum and shed light on the environmental conditions of the time.