The presence of beach ridges extending parallel to the present shorelines of many areas along U. S. coasts indicates progradation of these areas after the last glacial stage of the Pleistocene epoch. The general trend of shoreline changes in the past 100 yrs, however, was erosion of several hundred feet of the beaches. Three major causes are considered responsible for such increased erosion. These are: (1) hurricanes and severe storms; (2) recent eustatic rise in sea level; and (3) interference by man with natural shore processes.

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