Study challenges theories of earlier human arrival in Americas discoveruw PLOSONE
Specifically, the new analysis compared the stratigraphic integrity of three sites argued to contain evidence of earlier human occupation—two in Texas and one in Idaho—with the integrity of sites in Alaska, Wyoming and Pennsylvania. The three sites claimed to be older than 13,000 years ago all showed patterns of significant mixing, while the others did not.
The paper doesn't completely rule out the possibility that humans colonized the Americas at an earlier date."But if they did, they should have produced stratigraphically discrete occupation surfaces, some of which would be expected to have large numbers of artifacts.
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