|Title||Surficial geology, Elbow Lake, Manitoba, NTS 63-K/15|
|Author||Dredge, L A; McMartin, I|
|Source||Geological Survey of Canada, Canadian Geoscience Map 170, 2014, 1 sheet, https://doi.org/10.4095/293407|
|Publisher||Natural Resources Canada|
|Map Info.||surficial geology, glacial deposits and landforms, 1:50,000|
|Projection||Universal Transverse Mercator Projection, zone 14 (NAD83)|
|File format||pdf; rtf; shp; xls; xml; jpg; JPEG2000; xls|
|Area||Elbow Lake; Webb Lake; Cabin Lake; Wood Lake; Claw Lake; Little Claw Lake; Long Lake; Big Rat Lake; Labell Lake; Hootenany Lake|
|Lat/Long WENS||-101.0000 -100.5000 55.0000 54.7500|
|Subjects||surficial geology/geomorphology; glacial features; glacial deposits; glacial landforms; organic deposits; glaciofluvial deposits; tills; sands; gravels; ice flow; flow trajectories; Cenozoic;
|Program||Regional Geology & Geochemistry, GSC Northern Canada Division|
|Released||2014 01 29|
|Abstract||Glacial sediments comprising lee-side till deposits and a discontinuous till veneer are widespread throughout the area above an elevation of 300 m asl. There, bedrock outcrops and till are interspersed
with minor occurrences of Lake Agassiz offshore sediments, and organic deposits. The thickest till accumulations are found on the down-ice side of large bedrock obstructions and in structurally controlled bedrock depressions where thicknesses of 5 m
or more may occur. Rare streamlined landforms and till plain have till thicknesses reaching 15 m. Below 300 m asl, mainly in the eastern part of the map area and in some lowlands around Elbow Lake, Lake Agassiz offshore sediments are more pervasive.
In areas of high relief, till has undergone extensive washing and reworking during the regression of the post-glacial lake. Widespread nearshore and littoral sand and gravel occur within former glaciofluvial corridors in the northeast. Glacial
striations in the Elbow Lake map area record ice flow towards the SSW (mainly ranging between 195°-208°). Age relationships were observed at one site southeast of North Star Lake where an early flow towards 192° preceded an advance towards 156°.
These findings are related to the last cycle of glacial advance and retreat of ice originating from the Keewatin Sector to the north. Till sheets related to each of these events have not been recognized in the hand-dug pits or naturally exposed
sections in the area. The geoscientific data presented on this map (till samples and ice-flow indicators) were collected as part of the Shield Margin NATMAP Project (Nielsen, 1992; McMartin et al., 1996). Air photo interpretation (1:60 000 scale
aerial photographs) and map compilation were completed as part the TGI-3 Flin Flon Project from legacy work in 2012-2013.|
|Summary||(Plain Language Summary, not published)|
The Elbow Lake map (NTS 63 K/13) identifies surficial materials and associated landforms left by the retreat of the last glaciers to have covered the
area about 10,000 to 9,000 years ago. The surficial geology map is based on aerial photograph interpretation and fieldwork. This work was undertaken to provide new geological knowledge and improve our understanding of the distribution, nature and
glacial history of surficial materials. This supports informed decision making for resource development and land use, and contributes to effective mineral exploration methods in an area with significant mineral potential.