Newly excavated tools suggest humans lived in North America at least 30,000 years ago

Artefacts from central Mexico cave are strong evidence humans lived on continent 15,000 years earlier than previously thought

Tools excavated from a cave in central Mexico are strong evidence that humans were living in North America at least 30,000 years ago, some 15,000 years earlier than previously thought, scientists said on Wednesday.

The artefacts, including 1,900 stone tools, showed human occupation of the high-altitude Chiquihuite cave over a 20,000-year period, they reported in two studies published in the journal Nature.