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TitleReconnaissance surficial geology, Rivière Grandin, Northwest Territories, NTS 86-D
AuthorKerr, D E; O'Neill, H BORCID logo; Wolfe, S AORCID logo; Morse, P DORCID logo
Source2018 Yellowknife Geoscience Forum, abstract and summary volume; Northwest Territories Geological Survey, Yellowknife Geoscience Forum Abstract and Summary Volume 2018, 2018 p. 109 Open Access
logo Open Access
LinksOnline - En ligne (complete volume - volume complet, pdf, 1.32 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20180249
Meeting46th Annual Yellowknife Geoscience Forum; Yellowknife, NT; CA; November 20-22, 2018
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories
AreaRivière Grandin
Lat/Long WENS-120.0000 -118.0000 65.0000 64.0000
Subjectssurficial geology/geomorphology; glacial deposits; glacial landforms; glacial features; glacial lakes; meltwater channels; ice flow; drumlins; glacial flutings; crag and tail; drumlinoids; glaciation; deglaciation; Glacial Lake McConnell; glaciolacustrine deltaic sediments; glaciolacustrine beach sediments; glaciolacustrine offshore sediments; glaciofluvial hummocky sediments; moraine ridges; ice-flow directions; streamlined tills; ridged tills, moraine; Phanerozoic; Cenozoic; Quaternary
ProgramGEM2: Geo-mapping for Energy and Minerals
Released2018 11 01
AbstractThe Rivière Grandin map area is characterized by three glacial terrains identified by different surficial sediments and landforms. In the northeast along and inland from the shores of Hottah Lake, glacial Lake McConnell deltas, beaches and offshore sediments occur between 180-350 m elevation. Farther west, in the Ortona Lake area and westward, terrain near or above 500-600 m elevation is defined by hummocky glaciofluvial sediments, a few morainal ridges, abundant radial meltwater channels, and an absence of ice-flow indicators, which may indicate local cold-based ice regimes. On the eastern edge of these highlands, rare drumlins trend northwestward, perpendicular to the flutings at lower elevations to the north and south. The remaining and most extensive map areas are generally covered by streamlined till with interspersed ridged till (minor moraines). Drumlins, crag-and-tails and drumlinoids record northwestward and southwestward topographically-deflected divergent and convergent ice flows. The area north, west and south of Rome Lake has a greater concentration of ridged till. Late during deglaciation, various minor ice-flow shifts occurred in the southwest map area, indicated by small, superimposed streamlined landforms.
Summary(Plain Language Summary, not published)
The Rivière Grandin map (NTS 86-D) identifies surficial materials and associated landforms left by the retreat of the last glaciers. The surficial geology is based on aerial photograph interpretation, with striations from previous publications. This work provides new geological knowledge and improves our understanding of the distribution and nature of the surficial geology cover, and the glacial history of this region. It contributes to resource assessments and effective land use management.

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