FIGURE 3. Palaeo-environments in eastern Africa as a function of time and latitude since 15 Myr ago.

From the following article:

Closing of the Indonesian seaway as a precursor to east African aridification around 3–4 million years ago

Mark A. Cane and Peter Molnar

Nature 411, 157-162(10 May 2001)

doi:10.1038/35075500

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Green, humid environments; brown, more arid woodlands; and tan, more arid grasslands and deserts. Data sources as follows: Lake Tana24, Hadar26,28, Aramis25, Middle Awash29, Gadeb53, Omo26,27, East Turkana21,23,54, Baringo22; Fort Ternan, Olduvai and Laetoli21. Numbers indicate ages in Myr.

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