Burroughs, William J. -LRB- 2007 -RRB- '' Climate Change in Prehistory : the end of the reign of chaos '' -LRB- Cambridge University Press -RRB- Human migration The Saharan pump has been used to date four waves of human migration from Africa, namely : Homo erectus -LRB- ssp.
Burroughs, William J. -LRB- 2007 -RRB- '' Climate Change in Prehistory : the end of the reign of chaos '' -LRB- Cambridge University Press -RRB- During these periods of a wet Sahara, the Sahara and Arabia become a savanna grassland and African flora and fauna become common. The Saharan pump has been used to date four waves of human emigration from Africa, namely : Homo erectus -LRB- ssp.