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Footprints in the ash

Humans may have been walking around what is now central Mexico 40,000 years ago

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2:44pm, May 29, 2008

Footprints left in volcanic ash that fell in central Mexico’s ValsequilloBasin about 40,000 years ago are evidence that humans have inhabited the Americas far longer than previously confirmed, a new study suggests.

Analyses of three-dimensional laser scans of the imprints (example at right) confirm their human origin, says Silvia Gonzalez, a geoarchaeologist at LiverpoolJohnMooresUniversity in England.

Previous finds of human remains elsewhere in the region couldn’t

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