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Prehistoric Footprints Push Back Timeline of Humans' Arrival in North America

Found in New Mexico, the fossilized impressions date to between 21,000 and 23,000 years ago, a new study suggests

 


By Livia Gershon.

An analysis of fossilized footprints at White Sands National Park in New Mexico offers what some scientists say is the most conclusive evidence yet that humans lived in North America long before the end of the last Ice Age. The...



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