Meyle,
You are thinking about another mutation I have also discussed. The Cro-magnon are the ancestors of the Berbers and Iberians. It was members of this group that left Africa to found all human groups outside the continent.
http://www.temehu.com/History-of-Libya.htm
"50,000 BC to 30,000 BC:
About 37,000 years ago, Libya, and much of North Africa, was occupied by tall, large-brained, and powerfully built humans, known as the Cro-Magnon. The remains of this type were found to be older than other Cro-Magnon samples from other sites (Europe and Middle East), and it was widely believed that they were the direct ancestors of the Berbers and the Iberians. Cultural evidence from Fezzan, the home of the classical Garamantes Kingdom, then the most advanced people in the Sahara, goes back to more than 30,000 years. Stone implements dated to the late Acheulean and the Aterian (named after Bir el-Ater) cultures (100,000 - 30,000 BC) were found in numerous sites from the Fezzan area, and, according to most sources, many more await discovery. Rüdiger and Gabriele Lutz (1955) recall the cultures of Fezzan to have evolved over the past hundreds of thousands of years and vanished under adverse conditions. “Stone tools of bygone eras are lying about in millions, from the relics of early and late Acheulian (up to 500.000 years), Levalloisian (100.000 years) and Mousterian (50.000 years) to Aterian (40.000-20.000 years).” Many of the ancient Egyptian and Berber mythical gods and goddesses are still represented on the rock art of the Sahara, in what is known as the largest collection of prehistoric art in the world: well over one hundred thousand sites. The dating of Fezzan's rock drawings to 12,000 BC is widely disputed, and many scholars now call for pushing this date farther back in time on the light of the recent discoveries, and also strongly criticised the old techniques originally used to date the work some 40 or 50 years ago."