Dates for the Middle Stone Age of East Africa

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Science  28 Feb 1975:
Vol. 187, Issue 4178, pp. 740-742
DOI: 10.1126/science.187.4178.740


Three potassium-argon age determinations on sanidine from crystalrich pantellerite and volcanic ash in the Main Rift Valley of central Ethiopia indicate that the Middle Stone Age of East Africa began prior to 180,000 years ago. This suggests that the technological developments which characterize the Middle Stone Age have a far greater antiquity than previously estimated.