Preliminary Pollen Studies at Lake Zeribar, Zagros Mountains, Southwestern Iran

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Science  05 Apr 1963:
Vol. 140, Issue 3562, pp. 65-67
DOI: 10.1126/science.140.3562.65


A late Pleistocene Artemisia steppe, implying a cool, dry climate, changed about 13,000 years ago to an oak-pistachio savanna, as the climate became warmer. About 5500 years ago the savanna thickened to an oak forest, presumably reflecting an increase in precipitation or decrease in temperature to modern levels.