CONTENTS 



Page 



CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) 6 



I INTRODUCTION 7 



1 Scope of Survey 8 



2 Geographic Setting and Lake Floor Topography 8 



3 Data Analysis 11 



II RESULTS 15 



1 Primary Geologic Units 15 



2 Potential Sand and Gravel Deposits 19 



LITERATURE CITED 28 



APPENDIX 



A CORE SEDIMENT DESCRIPTIONS 29 



B SEDIMENT GRAIN-SIZE DATA 35 



C RSA SIZE ANALYSIS 41 



TABLES 



1 Grain-size scales-soil classification 14 



2 Summary of wood fragments present in eight cores and radiocarbon-14 



age date results 21 



FIGURES 



1 Location map of the study area 9 



2 Data coverage of seismic profiles and vibratory cores 10 



3 Bathymetric map of the study area 12 



4 Map of the central Lake Erie basin showing the transverse ridge 



that connects with Long Point and projects toward Presque Isle ... 13 



5 Shore-normal profiles of Presque Isle 15 



6 Map of the shale bedrock surface 16 



7 Locations of the interpreted seismic profiles 17 



8 Profiles A and B off Presque Isle 18 



9 Profiles G and H west of Presque Isle 18 



10 Extent of probable moraine segments in the study area 



based on the seismic and core data 20 



11 Cores containing wood fragments 21 



