Surficial geology, Brock River, Northwest Territories-Nunavut, NTS 97-D / [by] J.J. Veillette, D.A. St-Onge and D.E. Kerr. : M183-1/112-2013E-PDF

"The highest central regions of the Brock River map area were covered by active ice moving from the southeast, although exact ages of advance(s) are unknown. Deglaciation of parts of the high interior may have started in early Wisconsinan, and may have been free of active ice in middle Wisconsinan time or earlier. Evidence of ice-free conditions is limited. Fluctuating cover of thin ice, probably cold based, may have survived for extensive periods during the Wisconsinan. It disappeared in Late Wisconsinan, leaving widespread kames and ice-contact deposits overlying surficial sediments and bedrock. Till is widespread at all elevations. In the high interior, it is locally mixed with felsenmeer and isolated kames. Glaciofluvial deposits are concentrated along major river valleys. Postglacial fluvial erosion along the Brock River carved bedrock canyons up to 150 m deep. The upper Roscoe River is broad with sweeping meanders and terraces deeply incised into thick morainal deposits. Coastal regions have marine sediments associated with the postglacial sea"--Abstract.

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