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充分描述沉积物需要沉积物的许多性质特征,其中任一种沉积物样品的砂—粉砂—黏土含量比例是固定不变的,因此根据砂—粉砂—黏土的组成来对沉积物分类是非常重要的。砂、粉砂和黏土都有一个沉积物中值粒径划分的固定标准,1/256mm是粉砂和黏土的划分界线,1/16mm是粉砂和砂的划分
A full description of the sediment requires many of the characteristics of the sediment, in which the sand-silt-clay content of any of the sediment samples is fixed and therefore the sediment classification is based on the sand-silt-clay composition very important. Sand, silt and clay have a fixed standard of median grain size of sediment, 1 / 256mm is the delineation of silt and clay, 1 / 16mm is the division of silt and sand