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TitleSurficial geology, Brock River, Northwest Territories - Nunavut, NTS 97-D
AuthorVeillette, J; St-Onge, D A; Kerr, D E
SourceGeological Survey of Canada, Canadian Geoscience Map 112, 2013, 1 sheet, (Open Access)
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:250,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 10 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; shp; xml; xls; jpg; JPEG2000
ProvinceNorthwest Territories; Nunavut
AreaBrock River; Hornaday River; Cape Lion
Lat/Long WENS-124.0000 -120.0000 69.8333 69.0000
Subjectssurficial geology/geomorphology; glacial features; glacial deposits; glacial landforms; tills; sands; gravels; frost cracks; glaciofluvial deposits; colluvial deposits; alluvial deposits; moraines; organic deposits; Cenozoic; Quaternary
ProgramGEM: Geo-mapping for Energy and Minerals, GEM Tri-Territorial Information management & databases (Tri-Territorial Surficial Framework)
Released2013 03 26
AbstractThe 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.