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TitleSurficial geology, Walmsley Lake, Northwest Territories, NTS 75-N
DownloadDownloads
AuthorKerr, D E; Knight, R D; Sharpe, D R; Cummings, D I
SourceGeological Survey of Canada, Canadian Geoscience Map 140, 2014, 1 sheet, https://doi.org/10.4095/293773
Year2014
PublisherNatural Resources Canada
Editionprelim.
Documentserial
Lang.English
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:125,000
ProjectionUniversal Transverse Mercator Projection, zone 12 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; shp; xml; xls; jpg; JPEG2000
ProvinceNorthwest Territories
NTS75K
AreaReliance; Siltaza Lake; Great Slave Lake; McLeod Bay; Nonacho Lake
Lat/Long WENS-110.0000 -108.0000 63.0000 62.0000
Subjectssurficial geology/geomorphology; glacial features; glacial deposits; glacial landforms; tills; sands; gravels; frost cracks; glaciolacustrine deposits; glaciofluvial deposits; organic deposits; alluvial deposits; eolian deposits; colluvial deposits; Cenozoic; Quaternary
ProgramGEM Tri-Territorial Information management & databases (Tri-Territorial Surficial Framework), GEM: Geo-mapping for Energy and Minerals
Image
Released2014 05 12 (13:00)
AbstractThe Walmsley Lake map area is characterized by three broad zones based on distribution and nature of surficial sediments. In the north, hummocky till with a few isolated subdued moraine ridges, and smaller areas of till blanket dominate the landscape. The central area is defined by extensive regions of hummocky till in the east, and till blanket in the west. The southern regions consist of a combination of till blanket, till veneer, hummocky till and bedrock, the latter becoming more prevalent to the west. Tills are locally dissected by glaciofluvial corridors consisting of eskers, ice-contact sediments and scoured bedrock. These features record a westward meltwater paleoflow in the eastern regions, and a northwestward flow in the western regions. The earliest ice flow, defined by rare striae in the north, was southwestward. The last, dominant ice flow forms a partial radiating pattern defined by striae, fluted bedrock, crag-and-tails and drumlinoids. Ice flow was northwestward in the north and central regions, becoming west-southwestward in the south, though minor variations are found locally.
Summary(Plain Language Summary, not published)
The Walmsley Lake map (NTS 75-N) identifies surficial materials and associated landforms left by the retreat of the last glaciers which covered the area about 9000 years ago. The surficial geology is based on aerial photograph interpretation and fieldwork. This work provides new geological knowledge and improve our understanding of the distribution, nature and glacial history of surficial materials.
GEOSCAN ID293773