Ancient lakes of the Sahara
White, K. and Mattingly, D. J. (2006) Ancient lakes of the Sahara. American Scientist, 94 (1). pp. 58-65. ISSN 0003-0996
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As a result of climate change over the past 5000 years the Sahara changed from savannah to a desert landscape. The beds of ancient lakes are home to snail shells and the petrified roots of trees and shrubs. Examples of human occupation can also be seen in the form of fireplaces and discarded tools. Examination of the geological history of these sites can give a clearer picture of how the climate changed and how humans coped with these changes.