Shows Caucasians have 100K years plus of separate genetic development from other African sub groups, and 38K years separate genetic development from Mongoloids.
See also Science Magazine http://www.sciencemag.org/content/334/6052/94.abstract
The separation of the Sa'ami from the other Europeans is as long as 20,000 years, or as little as 7,000 years (until recent times of course).
There are other genetic isolates ~ one they're working on now are the folks in the Hebrides
Also, a correction ~ the people you identify as “Caucasion” are actually several different groups with known separations into various ice age refugia ~ one in the West (France/Spain), another on the Adriatic, another further East ~ and undoubtedly several others that’ve been all mixed up since the ice went away.