“Glacial periods with their massive falls in sea level are of course precisely the point at which the Bab-el-Mandeb crossing is likely to have been at its most obvious and navigable toearly hominins, so that the easiest and most attractive access by that route is likely to have been at a point when conditions
in southern Arabia, and for that matter on the corresponding coastal area of Africa, are likely to have been least appealing. Taken overall, the Bab-el-Mandeb Straits do not seem likely to have offered a likely gateway out of Africa for terrestrial mammals during the Lower and Middle Pleistcene, suggesting that movement across Sinai and then northward along the Levant, southward into Arabia, or eastward and beyond is the most plausible route.”
(Source: Handbook of Paleoanthropology: Vol I:Principles, Methods and Approaches)
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