| Title | Surficial geology, Walmsley Lake, Northwest Territories, NTS 75-N |
| Download | Downloads |
| Author | Kerr, D E; Knight, R D; Sharpe, D R; Cummings, D I |
| Source | Geological Survey of Canada, Canadian Geoscience Map 140, 2014, 1 sheet, https://doi.org/10.4095/293773 (Open Access) |
| Image |  |
| Year | 2014 |
| Publisher | Natural Resources Canada |
| Edition | prelim. |
| Document | serial |
| Lang. | English |
| Maps | 1 map |
| Map Info. | surficial geology, glacial deposits and landforms, 1:125,000 |
| Projection | Universal Transverse Mercator Projection, UTM zone 12 (NAD83) |
| Media | on-line; digital |
| Related | NRCan photo(s) in this
publication |
| File format | readme
|
| File format | pdf; rtf; shp; xml; xls; jpg; JPEG2000 |
| Province | Northwest Territories |
| NTS | 75N |
| Area | Walmsley Lake |
| Lat/Long WENS | -110.0000 -108.0000 64.0000 63.0000 |
| Subjects | surficial 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; Cenozoic; Quaternary |
| Program | GEM: Geo-mapping for Energy and
Minerals, GEM Tri-Territorial Information management & databases (Tri-Territorial Surficial Framework) |
| Released | 2014 05 12 (13:00) |
| Abstract | The Walmsley Lake map area is characterized by three broad zones based on distribution and nature of surficial sediments. In the north, hummocky till with a few isolated subdued moraine ridges, and
smaller areas of till blanket dominate the landscape. The central area is defined by extensive regions of hummocky till in the east, and till blanket in the west. The southern regions consist of a combination of till blanket, till veneer, hummocky
till and bedrock, the latter becoming more prevalent to the west. Tills are locally dissected by glaciofluvial corridors consisting of eskers, ice-contact sediments and scoured bedrock. These features record a westward meltwater paleoflow in the
eastern regions, and a northwestward flow in the western regions. The earliest ice flow, defined by rare striae in the north, was southwestward. The last, dominant ice flow forms a partial radiating pattern defined by striae, fluted bedrock,
crag-and-tails and drumlinoids. Ice flow was northwestward in the north and central regions, becoming west-southwestward in the south, though minor variations are found locally. |
| Summary | (Plain Language Summary, not published)
The Walmsley Lake map (NTS 75-N) 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. |
| GEOSCAN ID | 293773 |
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