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Originally Posted by
james stock
I'm sorry, but your time frame does not correspond with the published scientific papers which discuss african admixture. African admixture in Southern Europe is dated 29 generations to 400AD, and assuming E-M81 arrived 15,000 years ago, it would have nothing to do with autosomal african admixture. 15,000 years ago is far to distant admixture to contribute any significant DNA in modern humans, aside from Y-DNA, which does not recombine.
If E-M81 populations did contribute to the majority of the African component of autosomal European DNA then it occurred about 1500 years ago or 200-600AD.
Here are the findings of Moorjani et al.
It's interesting how Moorjani et al's own calculations contradict some of their own claims. Even assuming that their calculations and the value they assigned for a "generation" (which is usually accepted as 30 or 35 years, not 29) are correct, that "African" ancestry in Europe still predates the existence of Islam itself, let alone any Islamic "invasions". Their dating, however, does indeed coincide with the late Roman period, another of their claims regarding how this ancestry entered Europe.