在海底以下40m深度范围内，从上至下地层岩性分别为淤泥质粘土层、硬粘土

40m in depth below the seafloor, from top to bottom, respectively lithology silty clay, hard clay, sandy gravel layer, clay and sandy layers, respectively formed corresponding to the times for the new world of transgression, and late late Pleistocene, in early glacial and interglacial.

In the depth of 40m below the seafloor, the rock nature of the top to bottom formations is silt clay layer, hard clay layer, gravel-bearing sand layer, clay layer and sand layer, respectively, corresponding to the formation of the era for the new world sea invasion period and late, medium and early ice age.

In the depth range of 40m below the sea floor, the lithology of the upper and lower strata are respectively muddy clay layer, hard clay layer, gravelly sandy layer, clay layer and sandy layer, corresponding to the Holocene transgression and the late, middle and early glaciation and interglaciation of late Pleistocene.<br>