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TitleReconnaissance surficial geology, Willow Lake, Northwest Territories, NTS 85-L
DownloadDownloads
AuthorKerr, D E; Morse, P D; Wolfe, S A
SourceGeological Survey of Canada, Canadian Geoscience Map 304, 2017, 1 sheet, https://doi.org/10.4095/299468
Year2017
PublisherNatural Resources Canada
Editionprelim.
Documentserial
Lang.English
Maps1 map
Map Info.surficial geology, surficial deposits and landforms, 1:125,000
ProjectionUniversal Transverse Mercator Projection, zone 11 (NAD83)
Mediadigital; on-line
File formatreadme
File formatpdf; rtf; gdb; shp; xml; mxd (ArcGIS 10.2.2)
ProvinceNorthwest Territories
NTS85L
AreaWillow Lake
Lat/Long WENS-120.0000 -118.0000 63.0000 62.0000
Subjectssurficial geology/geomorphology; postglacial deposits; organic deposits; eolian deposits; colluvial deposits; alluvial deposits; glacial deposits; glacial features; glacial landforms; glaciolacustrine deposits; glaciofluvial deposits; tills; eskers; hummocks; moraines; thermokarst; patterned ground; ice wedges; scarps; paleogeography; raised beaches; shoreline changes; meltwater channels; beach ridges; drumlinoids; drumlins; crag and tail; ice movement directions; mineral springs; gravels; sands; silts; clays; boulders; outwash; landslide deposits; talus slopes; fans; terraces; beach deposits; postglacial emergence; glacial flutings; meltwater channels; Ancestral Great Slave Lake; Glacial Lake McConnell; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; index maps
ProgramRae Province Project Management, GEM2: Geo-mapping for Energy and Minerals
Image
Released2017 02 14
AbstractGlaciolacustrine sediments, associated with glacial Lake McConnell, were deposited as veneers over till in the broad, poorly drained low-lying areas of the northern, central and southeastern regions of the map area, below 290 m a.s.l. They are commonly overlain by organics and exhibit thermokarst activity. Glaciofluvial sediments and some bedrock ridges were reworked into glaciolacustrine beaches in the eastern lowlands. These beaches, occurring between 220 to 290 m a.s.l., mark the decreasing elevation of the glacial lake over time due to isostatic rebound. In the south, the Horn Plateau, rising to over 700 m, and consisting of till blanket, hummocky till, moraine complex, and colluvium on its slopes, remained above the limit of glaciolacustrine inundation. Crag-and-tails, drumlins and drumlinoids record a westward ice flow during the last glaciation, with local northwestward and southwestward diversions around the Plateau. A series of small moraine ridges on the Plateau may mark the retreat of ice margins or stagnating lobes during deglaciation about 11-10 ka BP.
Summary(Plain Language Summary, not published)
The Willow Lake map (NTS 85-L) identifies surficial materials and associated landforms left by the retreat of the last glaciers. The surficial geology is based on aerial photograph interpretation. 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.
GEOSCAN ID299468