Bordered by the Chungtiaoshan (中條山) on the North and the Tsinling (秦嶺) on the South, the area between Loyang and Sian, where the Huangho River hits and follows the old Weiho valley has been known for a long time to be specially rich in Cenozoic formations
C. C. YOUNG W. C. PEI.1934. ON THE CENOZOIC GEOLOGY BETWEEN LOYANG AND SIAN[J]. Acta Geologica Sinica(),13(0):
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