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‘America’s first footprints’ too old to be human

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‘America’s first footprints’ too old to be human

The mystery over when humans first populated the Americas continues to deepen - the history books may not have to be rewritten after all

THE mystery over when humans first populated the Americas continues to deepen. The latest date for rocks near Puebla, Mexico, which were said to bear fossilised human footprints, contradicts the suggestion made in July that humans reached the Americas 40,000 years ago. If people had indeed arrived this early then we would have to rethink everything we know about the history of early human migration.

Silvia Gonzalez of Liverpool John Moores University, UK, surprised the world’s media in July at a Royal Society exhibition in London by suggesting that markings found in a layer of ancient volcanic ash near Puebla were 40,000-year-old footprints. This would mean that people arrived in the Americas at least 30,000 years earlier than previously thought (New Scientist, 9 July 2005, p 19).

But the markings are unlikely to have been made by humans after all, because new argon dating reveals the rocks are 1.3 million …

More: newscientist.com

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