1. The finding of Uan Muggiag of the Holocene "Mesolithic" period in the Libyan desert is in keeping with what we know of the populating of the Sahara. The earliest rock art of the Round Heads style corresponds to the same Mesolithic period. They show human figures which have been interpreted as Negroid. In the following Bovidian period of rock art (after 7,000 BP - 5,000 BC) different racial types are attested and seem to supplant the earlier ones.
2. The theories of a fundamentally Negroid stock spreading northward through the Sahara during the Holocene which was once advanced on the basis on data on single skeletal finds (the case for Uan Muggiag) have been rejected on the strength of multivariate data supporting the presence of northern Mechtoid populations.
3. Recent genetic studies have ascertained the continuous gene variations between Negroid features prevailing in the south of the Sahara and Caucasoid (Mechtoid) features in the North. The findings attest to diversity and gradation from south to North, with some cohabitation in central Sahara.