From the study of skulls we can learn what early humans in Africa looked like. By early humans, I mean modern man, not earlier types.
Very early skulls from Africa resemble either Khoisans or no living type. Some Khoisan type skulls (broadly defined) can be found going back as far as 90,000 years. Boskopoid skulls from 35-50,000 YBP seem to look like Khoisan (Mirazón Lahr,p. 282). Early Kenyan skulls look also look Khoisan.
Negroes appear in the fossil record in Congo, Mali, Niger and Chad from 6,000-12,000 YBP. They develop in the course of agriculture as Khoisan and Pygmy types gathered into agricultural villages in the regions above. In hunter-gatherer societies, women need men and marry early, hence there is little competition for females and every man gets a woman. In African agricultural societies, there was plenty of food, and women no longer needed a man to provide for them.
Since women no longer needed men, women got picky. Extreme competition for women developed among men, and one man or a small group of men tended to monopolize the women. This is the “chief” syndrome also seen in primitive agricultural societies in New Guinea.
Extreme competition led to the largest, strongest and most aggressive males dominating the group and preferentially passing on their genes. Hence, Negroes developed into big, strong, good athletes with high testosterone which drove high aggression. This is one theory for high Black crime rates.
In contrast, Pygmies are not aggressive at all, and tend to be rather meek and shy. Khoisan have low testosterone and have low levels of overt aggression.
Nilotics appear in Kenya 8-12,000 YBP. Originally, when these Nilotic skulls were first found, they were mistaken for Europeans. These are the classic “Horner” types of the Horn of Africa. It is amazing that Nilotics would be mistaken for Europeans, but they do have a more Caucasian look to them.
Recent Sub Saharan Africans have skulls that are more gracile than Europeans (ibid. p. 283), so it is a lie to say that Blacks have primitive or robust skulls.
The only really robust or primitive skulls nowadays in the study were found in Australians (65% are robust), Pantagonians, the Ainu and 1 Polynesian. This largely lines up with the Australoid racial group, which developed in a robust fashion for some reason.
The most gracile skulls were 13 E Asians, 13 SS Africans, 11 SE Asians, 7 Europeans, 1 Inuit, 1 S Asian and 1 Australian. So we can see that the most modern and gracile skulls are found in Blacks and Asians. Europeans are also modern and gracile, but not so much as the others. We also see that while Australians generally have the most robust skulls on Earth, some Aborigines have very gracile skulls. Australians are best seen as an extreme mixture.
Why did man leave Africa, and which route did he take? The reason for leaving was apparently a terrible drought in East Africa. For instance, between 135,000 and 75,000 years ago, East African droughts shrunk the water volume of Lake Malawi by at least 95%, causing migration out of Africa.
Which route did they take? Researchers say their study of the tribes of Andaman and Nicobar islands using complete mitochondrial DNA sequences and its comparison those of world populations has led to the theory of a “southern coastal route” of migration from East Africa through India. They took the Indian Ocean coastal route.
- Mirazón Lahr, Marta. 1996. The Evolution of Modern Human Diversity: A Study of Cranial Variation. Cambridge: Cambridge University Press