CONTENTS 



F IGURE S — Con t inued 



Page 



3 Geologic cross section from the south shore of Long Island at Fire 



Island north across Long Island Sound to the Connecticut mainland. ... 15 



4 Bathymetry of Long Island Sound showing the major land and shoal 



features 18 



5 Cross-sectional profiles of the Long Island Sound sea floor 19 



6 Typical seismic profile off the Norwalk Islands, Connecticut 23 



7 Photos of apparent varve sediments retrieved in the Orient Point 



boring drilled into the Orient Point buried channel 25 



8 Map of coastal Connecticut from Branford to Hammonasset Point 



showing the location and alinement of several shoals and islands 

 determined as remnants of the Madison and Old Saybrook Moraines 26 



9 Map of late Wisconsin-age Harbor Hill and Ronkonkoma Moraines 



along Long Island 27 



10 Map of glacial features in eastern Long Island Sound 28 



11 Map of glacial features in the Norwalk Island region 30 



12 Typical seismic profile of a glaciated bedrock channel filled with 



Pleistocene sediments 31 



13 Eighty cores analyzed to show the four primary sediment types 



present in the top 5 meters of the sea floor 33 



14 The cores and seismic profiles used to map the surface sediment 



distribution of the four primary types in Long Island Sound 35 



15 Projects along the Connecticut shore involving beach fill..... 37 



16 The 14 primary sand and gravel deposits identified in Long Island 



Sound 38 



17 Map of western Long Island Sound showing four deposits and 



locations of the pertinent seismic and core data 40 



18 Interpreted profile of seismic line 1 of two shoals off Matinicock 



Point 41 



19 Map of primary deposits E and F along the Connecticut shore 42 



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