CONTENTS 



Page 



CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) 8 



I INTRODUCTION 9 



1. Background 9 



2. Field and laboratory Procedures 10 



3. Scope 12 



4. Geographic and Geologic Setting 13 



5. General Stratigraphy of Long Island and Connecticut 13 



6. Bathymetry 16 



7. Previous Geologic Investigations 17 



II GEOMORPHOLOGY AND SHALLOW SUBBOTTOM CHARACTER 21 



1. Shallow Subbottom Structure and Stratigraphy 21 



2. Surface and Subbottom Sediment Character and Distribution. . 32 



III BEACH-FILL NEEDS AND RESOURCE POTENTIAL 36 



1. Sandfill Requirements for Long Island and Connecticut 



Beaches 36 



2. Suitability of Sand for Beach Nourishment 37 



3. Primary Sand and Gravel Deposits 38 



IV SUMMARY 51 



LITERATURE CITED 53 



APPENDIX 



A CORE SEDIMENT DESCRIPTIONS 58 



B RESULTS OF GRAIN-SIZE ANALYSIS 63 



TABLES 



1 Generalized stratigraphy of Long Island 15 



2 General stratigraphy of Connecticut 16 



3 Summary of Quaternary geologic events 28 



4 Grain-size scales — soil classification 34 



5 Characteristics of sand and gravel deposits 39 



FIGURES 



1 Regional map of Long Island Sound showing its relation to the 



Piedmont province of Connecticut and Atlantic Coastal Plain 



province of Long Island 12 



2 Trackline locations for the high resolution seismic reflection 



profiles and vibratory cores used in the study 14 



5 



