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Reconnaissance surficial geology, Clarke River, Northwest Territories, NTS 65-M north

The Clarke River map area (north half) comprises isolated areas of glacially and meltwater scoured bedrock, till veneers and blankets, locally fluted, and strongly fluted (mega-scale glacial lineations) streamlined till in the northeast. Ridged till may overlie
fluted till blanket and streamlined till. Glaciofluvial esker complexes and associated meltwater outwash sediments trend westward (some may parallel pre-glacial valleys), southwestward, and northwestward. Glaciolacustrine sediments are a minor component. An early regional warm-based diverging
southwestern and southern ice flow is well preserved in the central regions across the map area. The youngest late deglacial ice flows, in the extreme southwest and broader northeast region, are both northwesterly. The latter represents the Dubawnt Lake ice stream. During ice retreat, ridged till
was deposited with minor moraines and larger recessional moraines locally. Ponding meltwater formed pro-glacial lakes with deltas, beaches, and trim lines from 355 m elevation, in the southwest, to 155 m, in the northeast.