[VadeRetro]

Isn't the most recent view that Europeans originated from humans that travelled somewhere over to South or Southeast Asia and then came back over to the Levant and Europe? I might be mistaken in this regard, but that seems to be my vague recollection. I'm gonna have to look that up if you can't help out!

Some have pointed out the Dmanisi, Georgia fossils as evidence for a back-to-Africa migration of erectus types. I suspect that was enough earlier to be irrelevant to the S-N split.

[AntiGuv]

Yes, that was part of my vague, mixed-up recollection, but I remembered that what I had in mind was the commentary at the N.G. Genographic Atlas. As can be seen there, the M9 Haplogroup is believed to have migrated from the Levant to Central Asia and then back over to Europe, with most Europeans carrying this marker.