Ancient “ghost tracks†have been unearthed in the American southwest, and they have big implications for human history in North America.
Scientists have found footprints dating to approximately 23,000 years ago in New Mexico’s White Sands National Park, and they offer evidence that humans have been on this continent longer than previously proven. .
“Despite a plethora of archaeological research over the past century, the timing of human migration into the Americas is still far from resolved,†begins a study on the footsteps, published Thursday in the journal Science.