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Evolution of mid- to late-Holocene climate of North Africa. Saharan dust flux over the Atlantic \(4\) increased sharply 5500 years ago [\ arrow in \(A\)], suggesting\ an abrupt end to the African Humid Period, whereas records from the West African Sahel \(10\) show a later rise [arrow in \(B\)]. A reduction in swamp forest in the Sahel \(9\), indicated by Guinean tree pollen \(C\), accompanied the demise of wetlands and broadly followed changes in insolation \(D\). http://www.sciencemag.org/cgi/content/full/320/5877/752/F2
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