lINfT.A.SSTFTF.n 



SECURITY CLASSIFICATION OF THIS PAGE(TWlan Data Enterad) 



Pleistocene and older sedimentary deposits underlie the study area at 

 shallow depths, and several prominent erosion surfaces and deeply incised, 

 and subsequently filled, stream channels are evident on the seismic records. 

 The thickness of Holocene sediments is generally less than 3 meters (10 feet), 

 except in channels, and the contact between the Holocene and Pleistocene units 

 is obvious in most cores and shows good correlation with a regional reflector 

 on the seismic profiles. Mud and muddy fine sands predominate in the area; 

 however, very fine to fine sand is present on the shoreface and in several 

 delta shoals. Five sites are identified which contain sand suitable for beach 

 nourishment; two of the sites, a shoal adjacent to Galveston south jetty and 

 an area off San Luis Pass, offer the highest potential. Volumetric estimates 

 indicate that 63 million cubic meters (82 million cubic yards) of sand exists 

 in the five sites. 



UNCLASSIFIED 



SECURITY CLASSIFICATION OF THIS PAGEriVhen Data Entered) 



