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TitlePredictive surficial geology, Wecho River, Northwest Territories, NTS 85-O
AuthorMorse, P D; Kerr, D E; Wolfe, S A; Olthof, I
SourceGeological Survey of Canada, Canadian Geoscience Map 277, 2016, 1 sheet, (Open Access)
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, surficial deposits and landforms, 1:125,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 11 (NAD83)
Mediadigital; on-line
RelatedNRCan photo(s) in this publication
File formatreadme
File formatpdf; rtf; xml; xls; shp
ProvinceNorthwest Territories
AreaYellowknife River; Russell Lake; Ghost Lake; Wheeler Lake; Germaine Lake; Armi Lake
Lat/Long WENS-116.0000 -114.0000 64.0000 63.0000
Subjectssurficial geology/geomorphology; glacial deposits; glacial features; landforms; terrain types; glaciolacustrine deposits; glaciofluvial deposits; Holocene; Pleistocene; tills; eolian deposits; organic deposits; lacustrine deposits; Slave Province; Cenozoic; Quaternary
Illustrationslocation maps
ProgramGEM2: Geo-mapping for Energy and Minerals, Mackenzie Corridor Project Management
Released2016 11 02
AbstractThe glaciated landscape exhibits ice flow features associated with ice advance such as drumlinoids, crag-and-tails and fluted bedrock, which together with striations, record a southwestward ice flow during the last glaciation. Glacially scoured bedrock dominates the area. Discontinuous till veneer is generally restricted to the northeastern map area. Glaciofluvial sediments, including eskers and kames generally trend southwestward. Many eskers consist of a series of short segments. During deglaciation about 11-10 ka BP, fine-grained glaciolacustrine sediments, associated with glacial Lake McConnell, were deposited in many western and southern topographic lows, up to 240 m or possibly higher. Related glaciolacustrine deltas and beaches, marking the decreasing elevation of the glacial lake over time due to isostatic rebound, occur at 270-295 m, although isolated deltas have also been observed at 310, 320, 330 m and as high as 350 m in the northeast. Postglacial eolian sediments exhibit dunes recording both north-northwestward and south-southeastward paleowind directions.
Summary(Plain Language Summary, not published)
The Wecho River map (NTS 85-O) identifies surficial materials and associated landforms left by the retreat of the last glaciers. The surficial geology is based on aerial photograph interpretation and limited legacy fieldwork. This work provides new geological knowledge and improves our understanding of the distribution, nature and glacial history of surficial materials. It contributes to resource assessments and effective land use management.