diluvianism
1. 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;