Barrier island, Sand spit, Longshore bar, Sand shoal

Overview

A sedimentary system composed of a series of sedimentary facies of a kind of bay or gulf whose entrance is half or full closed by sand spits, longshore bars and barrier islands. The facies are less subjected to the influences of waves and currents than bay and storm-dominated shelf. Tidal delta is a variety of delta.

Composed of spit sediments (Sands including plenty of shellfish fossils.), spit margin sediments (upward-fining interbedded sands and mud with sedimentary structures by the tide.), sand shoal sediments (upward-fining sands and mud.