B. J. Szabo

Document Type

Article

Publication Date

6-15-1994

Abstract

documented by radiocarbon dating- and geoarchaeological investigations, the now hyperarid northwestern Sudan and southwestern Egypt experienced a period of g greater effective moisture during early and middle Holocene time, about 10-5 ka. we have used the uranium-series technique to date lacustrine carbonates from Bir Tarfawi, Bi Sahara East, Wadi Hussein, Oyo Depression, and the Great Selima Sand Shect localities. Results indicate five paleolake- th G forming episodes occurred at about 320-250, 240-190, 155-120, 90-65 and 10-5 ka. Four of these five pluvial episodes may be correlated with major intcrglacial stages 9, 7, 5e, and I; the 90-65 ka episode may be correlated with substage 5c or 5a, Our results support the contention that past pluvial episodes North. Africa corresponded to the : interglacial periods farther notth, Ages of lacustrine carbonates from existing oases and from the sand sheet fail to ndicate plavial conditions betwecn about 60 and 30 ka. Age results and feld relationships suggest that the oldest A lake- and ground-water-deposited carbonates were much more extensive than those of the younger period, and that carbonate of the latest wet periods were geographically localizcd within depressions and buried channels.

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