|Title||Reconnaissance surficial geology, Rae, Northwest Territories, NTS 85-K|
|Author||Kerr, D E; Morse, P D; Wolfe, S A|
|Source||Geological Survey of Canada, Canadian Geoscience Map 290, 2016, 1 sheet, https://doi.org/10.4095/298838 (Open Access)|
|Publisher||Natural Resources Canada|
|Map Info.||surficial geology, surficial deposits and landforms, 1:125,000|
|Projection||Universal Transverse Mercator Projection, UTM zone 11 (NAD83)|
|File format||pdf; rtf; xml; xls; shp; mxd (ArcGIS 10.2.2)|
|Area||Marian Lake; Lac Levis; Fawn Lake; Birch Lake|
|Lat/Long WENS||-118.0000 -116.0000 63.0000 62.0000|
|Subjects||surficial 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|
Geo-mapping for Energy and Minerals, Mackenzie Corridor Project Management|
|Released||2016 10 27|
|Abstract||Following deglaciation about 11-10 ka BP, fine-grained glaciolacustrine sediments, associated with glacial Lake McConnell, were deposited in most of the map area, up to 290 m above sea level (a.s.l.).
These sediments overlie buried ice-flow features such as |
drumlinoids, drumlins, crag-and-tails and fluted bedrock, recording a southwestward ice flow during the last glaciation. A broad discontinuous band of till extends SE-NW in the central part
of the map area. Glaciofluvial sediments and some bedrock ridges were reworked into glaciolacustrine beaches throughout the area. These beaches, present at an elevation up to 300-310 m a.s.l., mark the decreasing elevation of the glacial lake over
time due to isostatic rebound. In the southwest, only the Horn Plateau, consisting of undifferentiated glacial deposits with colluvium on its slopes, remained above the limit of glaciolacustrine inundation. Minor glaciolacustrine iceberg scours in
the southeast and postglacial eolian dunes in the south-central regions trend SE-NW. The fine-grained glaciolacustrine sediments may be overlain by organics and exhibit thermokarst activity.
|Summary||(Plain Language Summary, not published)|
The Rae map (NTS 85-K) 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.