本文通过对长江口拦门沙地区崇明岛、横沙岛三个钻孔的微体古生物综合分析,发现全新世地层中有四个微体化石层,它们分别指示了该地层经历了(由下往上)由滨海-河流相→滨海-河口相→浅海相→河口相的环境演变过程。并结合孢粉和 C~(14)测年资料认为该区全新世地层可以四分,即古全新世、早全新世、中全新世、晚全新世。 Based on the comprehensive analysis of the microfacies paleontology of the three boreholes in Chongming Island and Hengsha Island in the estuary of the Yangtze River estuary, we found that there are four microfacies layers in the Holocene, which indicate that the strata experienced Up) from the coastal-river facies → coastal-estuarine facies → shallow marine facies → estuarine facies. According to the data of sporopollen and C ~ (14) dating, the Holocene strata in this area can be divided into four parts, that is, Paleocene, Early Holocene, Middle Holocene and Late Holocene.