Out Of Africa came back when the steppes up north got too cold and crowded. There was one big move south over the Glacial Maximum, the true winter of our Eurasian subspecies. (Can't say Wagons South, we didn't have the wheel yet.) That one is easy to spot in the modern African genome, being more recent, and bearing Neander DNA.
This one is from much, much earlier than that. "40 and 70 thousand years ago" they say. This constraint is pathetic (pre or post Sundaland?) but it is too late for Toba; time enough had elapsed for the Eurasians to drift from the African baseline. These Eurasians didn't bring Neander DNA.
That, saith Razib, is the profile of the Basal Eurasian, a ghost population hitherto spotted in its contribution to the non-Neander parts of the modern Eurasian (and American).
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