Onshore–offshore correlation of central Lake Erie glacial deposits

Dive observations, echogram transects, core sampling, and a seismic profile revealed that the lake bed of north-central Lake Erie is an extensive terrace cut by storm waves currents. The erosional unconformity on which Late Wisconsinan (Port Bruce Mackinaw) glacial units crop out. Beds massive diamictons, glaciolacustrine sediments containing parallel reflections, out alternately from west to east, resulting oscillatory ice retreat. These beds correlate with Port Stanley Drift phase) Wentworth (Mackinaw exposed in nearby shore bluffs onshore moraines. glacier earlier readvances formed tongues shelves central basin. Diamicton layers, some debris flows, constitute Till (offshore M O). A unit N was deposited during recessions. Glaciolacustrine P lies between O Mackinaw Till, Q. subsequent R overlaps Galt Moffat moraines, composed ridges Norfolk moraine Q extend across base Long Point, Ontario, Erie, Pennsylvania. Paris appears have been eroded wave-cut evident offshore only near south Erie. Laminated S, younger than R, occurs western part basin, correlates overflow Algonquin Huron