冲洪积平原

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主要分布于城阳河、白沙河之间, 城阳、流亭一带及胶州市四周地带。海拔高程
一般小于20米, 由山口向沿海逐渐展开,形成扇状山前冲洪积平原。地形平坦,微向河
床、沿海倾伏,坡降约2‰左右。堆积物厚15～20米,具双层或多层结构,上部以粘质砂
土和砂质粘土为主,下部为砂砾石层。