sites, regular monsoonal rains have ceased to reach
the Egyptian Sahara not later than 5300 B.C.E.
even in ecological niches such as the Gilf Kebir,
and permanent occupation was restricted to
southern areas such as Laqiya (34) and Wadi
Howar in Northern Sudan (fig. S2E).
Source: Climate-Controlled Holocene Occupation in the Sahara:
Motor of Africas Evolution (www.sciencemag.org SCIENCE VOL 313 11 AUGUST 2006)
Rudolph Kuper and Stefan Kropelin
Edit to add: To patrickgiles, just so you don't embarass yourself in the future Kmt_sesh happens to work at the Oriental Institute, amongst other places.
Edited by cormac mac airt, 18 November 2011 - 08:13 PM.