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TitleReconnaissance surficial geology, Nonacho Lake, Northwest Territories, NTS 75-F
AuthorFerbey, T; Levson, V M; Kerr, D E
SourceGeological Survey of Canada, Canadian Geoscience Map 207, 2015, 1 sheet, (Open Access)
PublisherNatural Resources Canada
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
File formatreadme
File formatpdf; rtf; shp; xml; xls; jpg; JPEG2000
ProvinceNorthwest Territories
AreaNonacho Lake; Hjalmar Lake; Gray Lake; Porter Lake; Doran Lake; Holiday Lake; Salkeld Lake
Lat/Long WENS-110.0000 -108.0000 62.0000 61.0000
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
ProgramGEM2: Geo-mapping for Energy and Minerals, Rae Province Project Management
Released2015 03 24
AbstractReconnaissance mapping, through aerial photograph interpretation and limited legacy field data in the Nonacho Lake map area, provides a basic understanding of surficial sediments and glacial history. Much of the area is characterized by rugged terrain, with steep-sided bedrock hills, and local relief reaching up to 100 m. Bedrock is well exposed in the western half of the map area. Till blanket, veneer and glaciofluvial outwash become increasingly more extensive in the central through to the eastern half of the map area, although bedrock can still be found in many regions. Fluted till, crag-and-tails and striations record ice advance to the west-southwest and southwest. Glaciofluvial corridors consisting of eskers, ice-contact sediments and scoured bedrock, record a generally southwestward meltwater flow across the map area during deglaciation. In the Nonacho Lake basin and Taltson River valley to the east, glaciolacustrine deltas and beaches are found at 320 m, 325 m, 335 m, and 350 m. In the Gray Lake basin, they occur at 330 m, 335 m, and 350 m. Pockets of glaciolacustrine sediments occur in several isolated lake basins, including Tejean, Porter, Vital, Halliday, Powder and Doran lakes. These are interpreted to be short lived, ice-dammed glacial lakes, with Nonacho Lake being the most extensive.
Summary(Plain Language Summary, not published)
The Nonacho Lake map (NTS 75-F) identifies surficial materials and associated landforms left by the retreat of the last glaciers which covered the area about 10000 years ago. The surficial geology is based on aerial photograph interpretation and limited fieldwork. This work provides new geological knowledge and improves our understanding of the distribution, nature and glacial history of surficial materials.