我国北部湾沿岸第四系沉积物有早更新世湛江组,为杂色粗碎屑夹粘土质粉砂和泥炭层,中更新世北海组,其岩性下部为黄褐色、红棕色砂砾层,上部是棕色、棕黄色粘土质砂、晚更新世沉积物为黄褐色、棕黄色粘土质粉砂与砂砾层,全新世为海相、冲积、坡积-残积各种成因类型沉积物. Quaternary sediments along the Beibu Gulf coast have early-Pleistocene Zhanjiang Formation, which is a variegated coarse clastic clayey silt and peat layer and a mid-Pleistocene Beihai Formation. The lower part of the lithology is yellowish brown and reddish brown gravel, Upper part is brown, brown clay sand, late Pleistocene sediments as brown, brown clay and sandy gravel, Holocene marine, alluvial, slope plot - residual sediment of various genetic types.