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The north is the alluvial plain of Huanghe, the Quaternary deposition is diluvian sand and soil . 中部为山前倾斜平原区，第四系厚度从南向北变厚，第四系为冲洪积形成的粘性土，下部基岩为奥陶系灰岩和第三系岩浆岩；