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The oldest proto-Negroid skull is from Nigeria (Iwo Eleru) is no older than 11200 ± 200 BP. Asselar Man is the oldest Negro in modern form, at only 6500 B.P. (Camp, 1974). The Negrid race is therefore relatively new adaption, to environmental factors, we presume.
The term often use to describe this Negrid trait is "Prognathism," which meansI'm not sure this is an exact description for the Negro jaw as it seems to imply an abnormal "underbite."being or having an upper or lower jaw that projects abnormally forward.
Here are some examples of the trait;
http://en.metapedia.org/wiki/Black_Africans
http://en.wikipedia.org/wiki/Negroid
http://erectuswalksamongst.us/Chap9.html
My questions are;
1. Why did it evolve?
2. What evolutionary advantages does it have, if any?
3. Is it an archaic trait?
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