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TitleSurficial geology, Snowdrift, Northwest Territories, NTS 75-L
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKerr, D E; Knight, R DORCID logo; Sharpe, D RORCID logo; Cummings, D I; Kjarsgaard, B AORCID logo
SourceGeological Survey of Canada, Canadian Geoscience Map 137, 2014, 1 sheet, Open Access logo Open Access
LinksSurficial geology map collection
LinksCollection de données de géologie de surface
PublisherNatural Resources Canada
Edition2, Prelim.
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:125,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 12 (NAD83)
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
RelatedThis publication supercedes Surficial geology, Snowdrift, Northwest Territories, NTS 75-L
File formatreadme
File formatpdf; rtf; shp; xml; xls; jpg; JPEG2000
ProvinceNorthwest Territories
AreaSnowdrift; McDonald Lake; Keith Island; Great Slave Lake; Pethei Peninsula
Lat/Long WENS-112.0000 -110.0000 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; eskers; Cenozoic; Quaternary
ProgramGEM: Geo-mapping for Energy and Minerals GEM Tri-Territorial Information management & databases (Tri-Territorial Surficial Framework)
Released2014 11 10
AbstractThe Snowdrift map area is characterized by predominantly glaciated, scoured and washed bedrock terrain. The more elevated areas north and south of the East Arm have isolated deposits of till veneer and blanket. Within the East Arm, some low lying depressions between bedrock ridges are infilled by glaciolacustrine sediments, with various colluvial deposits covering the steepest slopes. Glaciofluvial complexes consisting of eskers, ice-contact sediments and outwash, trend southwestward in the north and westward in the southern map areas. The Snowdrift River valley and its tributaries are predominantly infilled by terraced and floodplain alluvial sediments, and ridged and outwash glaciofluvial sediments, some with active dunes. The last ice flow recorded by glacial striae, fluted bedrock and crag-and-tails, was generally southwestward to westward, in the extreme southeast region of the map area. At various elevations, evidence of glacial Lake McConnell is found: isolated glaciolacustrine deltas at 350 m, 335 m, 320 m, 275 m, 260 m; washing limits at 335 m and 320 m; and raised beaches and wave-cut terraces at 335 m, 320 m, 305 m, 285 m, 228 m, 213 m, 200 m, 183 m and 168 m a.s.l.
Summary(Plain Language Summary, not published)
The Snowdrift map (NTS 75-L) 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.

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