I was not able to get the references (pop-ups and lots of other things blocked), and will have to dig them out in other ways and then reconcile them with that I thought I knew. In any case, this is educational, immensely entertaining, and thought provoking. Might even be right; that would be even better.
If only more scientists/anthropologists could do this well the Luddites and other anti-science folks would really be on the run!
Thanks.
This subject is covered in (exhausting) detail in Oppenheimer's excellent book: Out Of Eden. I also read his book Eden In The East, another good one.