ss=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%">style="FONT-SIZE: 14pt; LINE-HEIGHT: 150%">ace="Times New Roman">The Quaternary in the space prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:PlaceType w:st="on">Gulfst1:PlaceType> of <st1:PlaceName w:st="on">Thailandst1:PlaceName>st1:place> shows well-developed cyclicity. Eight parasequences have been identified by using high resolution 2D seismic(Boomer) profiles and engineering boreholes. Sediments change from marine mud to floodplain deposits from the bottom to the top of a typical parasequence. Incised fluvial systems and soil crust developed on top of each parasequence, which may indicate a significant subaerial exposure period after construction of each parasequence. Each parasequence represents a cycle of marine transgression and regression. space prefix = o ns = "urn:schemas-microsoft-com:office:office" />