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Jinding core(ZK04,36°47′35.36″N,108°19′05.24″E) is located in the northern area of Luohe river basin,northern Chinese loess plateau,lying to the southeast of Wuqi County about 20 km.The total depth of Core ZK04 is 92.20 m,and the central section(30.17-60.56 m) is " Wuqi paleolake" lacustrine strata with the thickness of more than 30 meters.