The swampy intertidal zone and part of the backshore of Henry's Island coast of 1969 have now been submerged. Topographic surveys, analysis of textural and palynological character of sediments coupled with time-series analyais of shoreline change show phasewise erosion. This has resulted in ingression of sea. Modern sand, transported from near coastal seabed, are being deposited overe the ancient clayey silt bed depending on retreat of high water line and relief. The shoreline has been retreated by about 450 m to 1 km.