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Their skeletons and musculature generally were less massive than the Neandertals.

The Cro-Magnon had broad, small faces with pointed chins and high foreheads.

It is also possible that migrations were not only in one direction--people could have migrated into Africa as well.

If interbreeding occurred, it may have been a rare event.

This seems to be the case with the Y chromosome in human males.

found that the human betaglobin gene is widely distributed in Asia but not in Africa.

As a consequence there was a major ecosystem disruption resulting in the rapid decline of both non-human carnivores and their prey.

Humans were very likely the trigger that set off this "trophic cascade".

It would seem from these dates that the location of initial modern Homo sapiens evolution and the direction of their dispersion from that area is obvious. Since the early 1980's, there have been two leading contradictory models that attempt to explain.

This supports the contention of direct genetic links between Asian Homo erectus and modern Asians.

Alan Thorne of the Australian National University believes that Australian aborigines share key skeletal and dental traits withuer, of the University of Hamburg in Germany, proposes that the first modern humans did evolve in Africa, but when they migrated into other regions they did not simply replace existing human populations.

They point to the fact that many Europeans have relatively heavy brow ridgesdating to 200,000 years ago.

Like Homo erectus, East Asians today commonly have shovel-shaped incisors while Africans and Europeans rarely do.

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By 115,000 years ago, early modern humans had expanded their range to South Africa and into Southwest Asia (Israel) shortly after 100,000 years ago.