CONTENTS 



Page 



I. INTRODUCTION , 1 



II. FIELD TECHNIQUES , 4 



1. Drill-Hole Study , 4 



2. Seismic Refraction Study 13 



III. SEISMIC PROFILE INTERPRETATION 20 



1. Formulas and Nomograms ........ 20 



2. Seismic Velocities 20 



3. Graphic Interpretation ...... 22 



4. Problems of Interpretation . ........ 25 



IV. DRILL-HOLE INTERPRETATION 41 



1. Generalized Stratigraphy ........ 41 



2. Glacial Till and Glaciomarine Clay 41 



3. Indurated Clay ......... 43 



4. Weathered Zone 45 



5. Black Peat 45 



6. Estuarine Sediments 45 



V. CASE HISTORIES FROM PLUM ISLAND. . 47 



VI. DEVELOPMENT OF A BARRIER ISLAND. 55 



VII. CONCLUSIONS 57 



LITERATURE CITED .... ...... 59 



APPENDIX - SUMMARY LOGS OF DRILL HOLES 63 



TABLE 



Listing of Bore Holes Containing Marine Clay 44 



FIGURES 



1. Location Map for Study Area 2 



2. Location Map for Drill Holes and Seismic Lines 5 



3. Drill Rig on Barge Platform 6 



