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Formation Age of the Highest Terrace of the Yellow River in Baode Area

LIU Yun-ming,LI You-li(College of Environmental Sciences,Peking University,Beijing 100871,China)  
Based on detailed field investigation,six terraces in Baode area were found,and the fourth one is the most well-developed.The highest terrace that is covered by Late Tertiary red clay is the oldest one.The lithology of gravel on sixth terrace mainly is limestone,secondly is sandstone,similar with T4 which belongs to ancient Yellow River.The authors conjecture the Late Tertiary terraces belong to ancient Yellow River.Magnetostratigraphy study shows that the bottom age of Moshangou section is about 6.5 Ma.Jijiagou section which was already studied has similar result,so the formation age of the oldest terrace in Baode area is about 6.5 Ma.However,red clay and tectonics study indicate that the Yellow River around Ordos block probably came into being as the uplift of northeastern margin of Qinghai-Tibetan Plateau at about 8 Ma.
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