From Newsgroup: sci.anthropology.paleo
https://www.science.org/doi/10.1126/sciadv.ady9545
Characterizing the American Upper Paleolithic
Abstract
In North America, there are enough sites with
relatively large tool assemblages predating
~13,500 calibrated years before the present
(cal yr B.P.) to allow assessment of the
underlying characteristics of their shared
lithic tradition. Their shared technological
features involve the use of dual core-and-blade
and biface technologies similar to those in the
Northeast Asian Late Upper Paleolithic. These
dual approaches were often merged to produce
small projectile points, including stemmed
point forms using an elliptical cross-sectional
ogive design. Similar dual lithic technologies
are found in assemblages in northern Japan
dating to ~20,000 cal yr B.P. We suggest a
group with a similar lithic technology became
isolated somewhere in the vicinity of the
Paleo-Sakhalin-Hokkaido-Kuril region, developing
genetically into ancestral American populations.
Between ~22,000 and ~18,000 cal yr B.P., a subset
of this population migrated along the southern
Beringian and Northwest coasts into the Americas.
By ~16,000 to ~15,000 cal yr B.P., they had
become widely dispersed across North America.
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