#footprit

“Ghost Tracks,” New Mexico 23,000 to 21,000 Years Ago,

Footprints left behind by prehistoric people may be some of the strongest evidence yet that humans arrived in the Americas earlier than previously thought.  

Over 60 “ghost tracks” — so-called because they pop up and disappear across the landscape — show that people romped through what’s now New Mexico 23,000 to 21,000 years ago, geoscientist Matthew Bennett and colleagues report in the Sept. 24 Science. If true, the fossil findings would be definitive proof that humans were in North America during the height of the last ice age, which peaked around 21,500 years ago.