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17620 pages, Hardcover
First published January 1, 1970
Meanwhile in Upper Egypt a falling-off of water-supply, first sign of a post-pluvial aridity which was later to affect the whole of the Nile valley, had initiated a local phase of aggradation, during which the river, unable to carry its load, had choked the valley with a thick deposit of silt. Without tracing in detail this rather complicated geological story, it is possible to say that at this stage the 8-9 m. aggradation gravels of Middle and Lower Egypt, in so far as they are accessible for study, contain the same flake industry, the Levalloisian, as do the 3–4 m. terrace and the basal silts of Upper Egypt.