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  • Title: Isotopic evidence for dramatic climatic changes in East Africa during the Pleistocene.
    Author: Cerling TE, Hay RL, O'Neil JR.
    Journal: Nature; 1977 May 12; 267(5607):137-8. PubMed ID: 16073417.
    Abstract:
    Rainfall decreased dramatically in the Lake Turkana region 1.8-2.0 Myr ago and in the Olduvai Gorge region 0.5-0.6 Myr ago. This is documented by a major increase in the delta18O values of pedogenic and groundwater carbonates at these times. The data suggest that meteoric water of the earlier, more humid climate was 2-4 per mil lower in 18O content than modern waters of these regions.
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