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Scientists say they found artifacts in Idaho indicating that humans lived there about 16,500 years ago, which is further evidence that early settlers settled inland while traveling along the North American Pacific coast.
The stone tools found there are fears of repeated human visits, according to a team led by archaeologist Loren Davis of Oregon State University. The researchers used radiocarbon dating and Bayesian analysis – a kind of statistical analysis – to locate the age of artifacts between 15 280 and 16 560 years.
The conclusion of the study, published in the journal Science, is based on findings from a site in western Idaho called Cooper's Ferry.
The classic narrative is that the Americas were settled after the migration of a now-submerged land bridge, called Beringia, which once stretched from Siberia to Alaska. In Canada, the ice sheets blocked the southward migration for some time, but a hole in the ice opened up and people moved through this so-called "ice-free corridor".
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This photograph shows a glimpse of Cooper's Canyon Ferry in the west of Idaho.
(AP)
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However, as scientists have discovered more and more signs of humans living in the Americas in recent years, some have argued that people have come forward there before the appearance of this corridor. Perhaps they have traveled the Pacific either on foot or by boat, or both.
The tools look like stone artifacts made at that time in present-day Japan, according to the study's summary.
Michael Waters of the Texas Center for Early American Studies, A & M, told The Associated Press that he preferred an age of between 14,200 and 15,000 years. This would put him on the calendar of several sites in Texas, Wisconsin and Oregon, he said. Regarding the connection with Japan, "I think they are on the right track."
Waters called the site "great discovery".
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Associated Press contributed to this report.
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