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"The Caucasians branched off before the cold-weather Mongoloid adaptations. I can provide a couple of references if you are interested."

Yes. Very interested...I'd like to see something more specific. I've suspected this but never had 'hard' evidence.

Did you see Oppenheimer's Journey Of Mankind DNA map that I post from time to time. His map shows an early group entering the Americans about 25,000 years ago and are responsible for the artifacts at Meadowcroft. I believe these people may be the Ainu 'types' that we see in Kennewick Man, Spirit Cave Man and perhaps the folks found in Mexico. They were probably killed or absorbed by the later groups of Mongoloids.

Oppenheimer said that he thought there were probably five waves of immigrants but, his data only supports three waves.(?)

Professor Stephen Oppenheimer"Stephen Oppenheimer is a world-recognised expert in the synthesis of DNA studies with archaeological and other evidence to track ancient migrations. He is a member of Green College, Oxford University"

Journey Of Mankind

The two books are "Out of Eden" and "The Real Eve," both by Oppenheimer. These provide the details for the map you posted. Very interesting reading!

Not sure if the Ainu migration reached Meadowcroft or not. That would mean at least two migrations for that group. The Pacific coast Early Coastal Migration is probably related to the Ainu, some 13-15,000 years ago or more. That would account for Kennewick Man and Santa Rosa Woman, as well as early South American finds. But Meadowcroft is a long way from the Pacific Ocean where watercraft would have been the most convenient, and quickest mode of travel.