The discovery of ancient stone tools at an archaeological dig in Texas could push back the presence of humans in North America, perhaps by as much as 2,500 years. Thousands of artefacts dating to between 13,200 and 15,500 years ago were uncovered by researchers led by Michael R. Waters of Texas A&M University.
They report the discovery in tomorrow's edition of the journal Science.
The find was located five feet below materials left by the well-known Clovis culture, which was once thought to have been the first American settlers around 13,000 years ago.
It was 'like finding the Holy Grail', Professor Waters said in a telephone interview. To find what appears to be a large open-air campsite 'is really gratifying. Lucky and gratifying'.
The trove of 15,528 artefacts, including chipping debris from working stones and 56 tools - such as blades, scrapers and choppers - was found in the Buttermilk Creek complex near Austin.
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