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The classic account of the riparian lifestyle of this period comes from investigations in Sudan during World War II by British archeologist Anthony Arkell.
This type of economy, so richly depicted in the Tassili n'Ajjer cave paintings, predominated in North Africa until the classical period.
Saharan rock art was produced in the "Green Sahara" during the Neolithic Subpluvial period (about 8000 to 4000 BC).
During periods of a wet or "Green Sahara", the Sahara becomes a savanna grassland and various flora and fauna become more common.
Following inter-pluvial arid periods, the Sahara area then reverts to desert conditions and the flora and fauna are forced to retreat northwards to the Atlas Mountains, southwards into West Africa, or eastwards into the Nile Valley.
Clement and fertile conditions during the Neolithic Subpluvial supported increased human settlement of the Nile Valley in Egypt, as well as neolithic societies in Sudan and throughout the present-day Sahara.