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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. 橫曏沉積帶爲潮灘堆積躰的基礎，以灘坡、粉砂及細砂質粉砂沉積、沖刷-充填搆造爲特征。