Ramsey, K.W.Tomlinson, J.L.2013-01-102013-01-102012-12http://udspace.udel.edu/handle/19716/12056The geologic history of the surficial units of the Bethany Beach and Assawoman Bay Quadrangles is that of deposition of the Beaverdam Formation and its subsequent modification by erosion and deposition related to sea-level fluctuations during the Pleistocene. The geology reflects this complex history onshore, in Indian River Bay and Assawoman Bay, and offshore in the Atlantic Ocean. Erosion during the late Pleistocene sea-level lowstand and ongoing deposition offshore and in Indian River Bay during the Holocene rise in sea level represents the latest of several cycles of erosion and deposition.en-USBethany BeachFenwick IslandSussex CountyIndian River Inletgeologic mapalluvial depositsalluvium and swamp depositsAtlantic Coastal Plainbarrier washover depositsbeach depositsBeaverdam FormationBethany FormationCarolina Bay depositscoastal geologydredge disposal depositsdune depositsdune washoverfillfinger shoal depositslagoon depositsLynch Heights Formationmarine depositsmarsh and tidal depositsmarsh depositsnearshore depositsQuaternary Periodsheetsand depositsshoreline depositsSinepuxent FormationSTATEMAPsurficial geologyMap