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And the lower strata of tidal flat, a zone of seaward accretion, is characterized by the slope, silt or sandy silt sediments and scour-fill structures respectively. 横向沉积带为潮滩堆积体的基础，以滩坡、粉砂及细砂质粉砂沉积、冲刷-充填构造为特征。