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Our reinvestigation indicates that Sunnybrook drift represents a glaciolacustrine-subglacial-glaciolacustrine cycle, the Ontario lobe being the main glacial agent. Glacier ice overrode the present Toronto area during Sunnybrook deposition, deforming the substrate and depositing subglacial till. We propose that Sunnybrook drift comprises three or four members: a diamictic Sunny Point member (mainly till) sandwiched by two glaciolacustrine members (Sylvan Park and Bloor), and possibly a subglacial fluvial member (Pottery Road) associated with till deposition.

The Sylvan Park member represents glaciolacustrine fine sediment that was overridden, deformed, and incorporated by ice that deposited the Sunny Point member. Parallel striated stone pavements, parallel...

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