From the air, Leakey thought the Koobi Fora area appeared to be sedimentary rock, which is slow to accumulate and often preserves fossils. A 1968 expedition showed Leakey was right; the rocks turned out to be fossil-rich sediments. The harsh, desert-like Koobi Fora area contrasts with the rich "Jade Sea" of saline Lake Turkana to its west.

Photograph by Aly Lubov, MyShot
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