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TitleSurficial geology, Erly Lake, Northwest Territories - Nunavut, NTS 97-A
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AuthorVeillette, J; St-Onge, D A; Kerr, D E
SourceGeological Survey of Canada, Canadian Geoscience Map 111, 2013, 1 sheet, https://doi.org/10.4095/292245
Year2013
PublisherNatural Resources Canada
Editionprelim.
Documentserial
Lang.English
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:250,000
ProjectionUniversal Transverse Mercator Projection, zone 10 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; shp; xml; xls; jpg; JPEG2000
ProvinceNorthwest Territories; Nunavut
NTS97A
AreaErly Lake; Hornaday River
Lat/Long WENS-124.0000 -120.0000 69.0000 68.0000
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 Tri-Territorial Information management & databases (Tri-Territorial Surficial Framework), GEM: Geo-mapping for Energy and Minerals
Image
Released2013 03 26
AbstractThe highest central regions of the Erly Lake map area were covered by active ice advancing from the southeast, although exact ages of advance(s) are unknown. Deglaciation of parts of the high interior and southwestern sector of the map area 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 the Late Wisconsinan, leaving widespread kames and ice-contact deposits overlying surficial sediments and bedrock. Till is widespread at all elevations, and can be variable in thickness, hummocky and makes up moraine ridges and streamlined landforms. 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 Hornaday River carved bedrock canyons up to 150m deep.
GEOSCAN ID292245