CONTENTS 



TABLES 



Page 



1 Surface-sediment echo character and their interpretation 24 



2 Properties of basal till and flow till in study area 30 



FIGURES 



1 Lake Erie study area, from Conneaut to Marblehead, Ohio 10 



2 Trackline location map, Ohio-Penny slvania State line to east of 



Fairport Harbor 11 



3 Trackline location map, east of Fairport Harbor to Northeast 



Yacht Club 12 



4 Trackline location map. Northeast Yacht Club to Avon Point 13 



5 Trackline location map, Avon Point to Vermilion 14 



6 Trackline location map, Vermilion to Cedar Point 15 



7 Trackline location map, Cedar Point to Long Beach 16 



8 The DCS Research Vessel GS-1 used to tow the seismic equipment 



and locate core sites 17 



9 A 6-meter-long vibratory coring apparatus used to collect 



sediment cores 18 



10 The U.S. Army Engineer District, Buffalo, tugboat Washington 19 



11 Seismic record showing character of shale reflector 22 



12 Seismic record showing internal reflectors in till deposit 23 



13 Rock structure contour map as interpreted mainly from the seismic 



reflection records 27 



14 Till structure contour map as interpreted mainly from the seismic 



reflection records 28 



15 Photo of basal till in core 79 29 



16 Photo of flow till in core 98 29 



17 Photo of varved (?) clay in core 98 29 



18 Seismic record showing the smooth surface echo character of the 



flow till in the Cleveland area 31 



19 Seismic record showing the irregular surface echo character of 



the till 32 



5 



