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The north is the alluvial plain of Huanghe, the Quaternary deposition is diluvian sand and soil . 中部爲山前傾斜平原區，第四系厚度從南曏北變厚，第四系爲沖洪積形成的粘性土，下部基巖爲奧陶系灰巖和第三系巖漿巖；