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Seismic reflection profiles show that most of the area is underlain by a 

 rock mass with a highly irregular surface below which no coherent reflections 

 appear on available records. Highs in this unit outcrop in places while lows 

 are either partly or completely filled with acoustically transparent material 

 having internal reflection patterns which indicate a stratified deposit. 

 Cores and extrapolation from onshore outcrops indicate that the lower unit 

 consists of dissected basement complex rocks overlain in places by glacial 

 drift and the upper (transparent) unit consists mainly of Pleistocene 

 glaciomarine and Holocene sediments. 



The predominant sediments of the surface and shallow subsurface (less 

 than 15 feet) deposits in the study area are fine sand, sand and gravel, and 

 clayey silt. Sand suitable for beach restoration and nourishment on the 

 contiguous coast occurs only locally and in generally small quantity relative 

 to other sediments of the study area. Seven potential borrow sites are 

 located and discussed. 



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