本文依据８个钻孔样品分析数据和数十个参考钻孔资料，讨论了全新世沉积层序，发现了埋藏潮沙体，并阐述其沉积特征、形成机制和发育演化过程。埋藏潮沙体可区分为潮沙堤、潮沙波和潮沙脊３个亚相，它们是在冰后期海进－海退过程中，随着长江三角洲前展、南偏，长江携来的砂质物质在强潮流作用下依次形成并得以保存在地层中的。现代辐射状潮流沙脊群是埋藏潮沙体的发展延续。

Based mainly upon anlysing of eight drill-holes and upon other several dozens ofis paper. It is non-marine facies of Pleistocene that under lay the sediments of Holocene with an unconformity between them. The Holocene sedimentary sequences can be divided into the lower transgressive and the upper regressive ones, consisting of beach facies (contains estuary-bay facies in some part of the studied area), nearshore neritic facies (tidal sand body facies) and tidal flat facies. It is obvious that facies change horizontally. It merits notice that the nearshore neritic facies is composed of fine sands or silty fine sands in all drill-holes. Characteristics of the sand bands have been researched about their textures, structures, minerals and microfossils etc. Through comparative sedimentological study with the modern tidal sand ridges in Jianggang, it is found that the buried sand bodies belong to the type of tidal sand body.Tidal sand body refers to the sand body of geomorphological bedform formed by the tide current.Along with the changes in current power and sand source, the bedform appears diffenent shapes, and forms different types of tidal sand bodies.According to the differences in their sedimentological characteristics and microfossils, the buried tidal sand bodies can be distiguished into three types: Ⅰ) nearshore tidal sand bars, Ⅱ ) tidal sand waves. and Ⅲ ) nearshore tidal sand ridges. They correspond respectively to the sand banks discribed by Stride (1982) and Caston (1972), the sand waves discribed by Stride (1982) and Belderson (1966) and the sand ribbons discribed by Stride (1982),Kenyon (1970) and Off (1963) or sand ridge discribed by Swift ( 1975 ).