The changes in sea-level are accepted worldwide to have closely related to the evolution of the coastal plain (Choowong, 2004) . Geological indicator such as sea notch, old sand barrier, beach ridge, relict strandlines, and former tidal flat have been employed to determine the position of the shoreline in the Quaternary. In Thailand, the literature and published papers (e.g. Somboon and Thiramonkol, 1992; Choowong, 2002; ) mentioned that the present coastal area from the Gulf of Thailand was

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... oded especially in the Holocene period mostly as a result of eustatic sea-level change. From the Middle to Late Holocene, sea level rose rapidly from about -12.75 m below mean sea level (MSL) to the maximum highstand about +3.5 m