Having touched on this matter in an earlier posting but in a broader topic involving more lineages, this post will focus on one lineage—haplogroup E3a.
Geological and geographical evidence
~23 ky ago: Ogolian aridity takes hold, and renders much of north Africa desertified.
The advent of Hg E3a's TMRCA essentially coincides with rise of the Ogolian aridity.
PN2 clade (E3) bearers in the
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» NRY Haplogroup E3a: A Multidisciplinary Proposal of Its Origins