长江三角洲南翼晚更新世古土壤及其成土环境

长江三角洲南翼全新统下伏的硬粘土层具有粘粒胶膜、土膜结构体、裂隙和微裂隙、植物根系和植物碎屑等古土壤特征，系古土壤。软锰矿的分布指示地下水位在地面上下３ｍ左右，这由于冰期低海面本区相对海拔较大所致。

Late Pleistocene Paleosols and Soil-forming Environment at the Southern Flank of the Yangtze Delta

The first stiff clays at the southern flank of the Yangtze Delta are considered to be paleosols by their cutsns, pods, clay-filled cracks, nodules, motifes, roots, plant debris, and their absence of sedimentary structures, etc. It is inferred from the concentration of MnO2.nH2O that the depth of groundwater was abode three met6rs, which is due to the higher elevation of this area during the period of glacial low stand of sea level. The well-developed and clay-filled cracks,along with the fluctuations of groundwater, indicate that the dry and wet seasons were distinctive and the effects of monsoon were stronger than nowadays.Paleosols are thicker than modern BOils, and are thinner in the east than in the west of this area, which relates to the different time spans of pedogenesis caused by transgression and regression.