Humans arrived in North America 2,500 years earlier than previously believed, exploding an 80-year-old assumption about who settled the continent.

The Clovis people, known for their distinctive spear points, had been thought to be first, said Michael Waters, a professor of anthropology at Texas A&M University in College Station.

The discovery of ancient tool remnants, knives and spears, reported yesterday in the journal Science, shows that the Clovis weren't the earliest to migrate into North America, said Waters, one of the study's authors.

The artifacts found in Texas show that human beings may have been in North America as early as 15,500 years ago, researchers said. The group reported finding almost 16,000 artifacts from that period.

The site, near Austin, is 2,500 years older than previous North American discoveries.

-- Bloomberg News

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