That would make the settlement more than twice the age of other known human settlements in North America.
If true, scientists said, the findings would rewrite theories of when and how man first came to the continent.
Plant material at USC's Topper archaeological site in Allendale County has been radiocarbon dated to approximately 50,000 years ago and may be older, said Albert Goodyear, a USC archaeologist in charge of the project.
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