From 135,000 to 90,000 years ago tropical Africa had megadroughts more extreme and widespread than any previously known for that region, according to new research.
Learning that now-lush tropical Africa was an arid scrubland during the early Late Pleistocene provides new insights into humans' migration out of Africa and the evolution of fishes in Africa's Great Lakes.
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The new finding provides an ecological explanation for the Out-of-Africa theory that suggests all humans descended from just a few people living in Africa sometime between 150,000 and 70,000 years ago.
Which is very interesting. But:
Migration of Early Humans From Africa Aided By Wet Weather
Science Daily — The African origin of early modern humans 200,000--150,000 years ago is now well documented, with archaeological data suggesting that a major migration from tropical east Africa to the Levant took place between 130,000 and 100,000 years ago via the presently hyper-arid Saharan-Arabian desert.
This migration was dependent on the occurrence of wetter climate in the region. Whereas there is good evidence that the southern and central Saharan-Arabian desert experienced increased monsoon precipitation during this period, no unequivocal evidence has been found for a corresponding rainfall increase in the northern part of the migration corridor, including the Sinai-Negev land bridge between Africa and Asia.
Not precisely opposite conclusions, but one wonders whether hyperaridity in subsaharan Africa jives with wetter conditions north.
And for even MORE see here.