RECORD OF ENVIRONMENTAL CHANGE IN RESHUI PROFILE AT KUNLUNSHAN PASS SINCE 18 kaBP

A study of the sedimentary structures,chemical compossition,grain size and sporopollen assemblages of the 270 cm thick sediments of the Reshui Profile has yielded information of environmental change since 18 kaBP at Kunlunshan Mountains Pass,Qinghai Tibetan Plateau.The evidence indicates a severe cold-dry climate in 18-11 kaBP,a period which corresponds to the time span from the climax to the end of Late Glaciation.There were two warmer periods in 10-7.8 kaBP and 4.5-3 kaBP.Two colder periods occurred in 6.7-5.6 kaBP and in a time after 2.3 kaBP.