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Subglacial features, Ste-Marguerite, Quebec, Canada.
Small outcrops have been polished by glacier ice and subglacial meltwater.The smallest features are striations. the deeper grooves, depressions and holes were formed from pressurized meltwater acting beneath the ice.
(Source: Natural Resources Canada. Photographer: Lynda Dredge. Copyright Terrain Sciences Division, Geological Survey of Canada.)
