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TitleReconnaissance surficial geology, Overby Lake, Nunavut, NTS 76-I
AuthorDredge, L A; Kerr, D E
SourceGeological Survey of Canada, Canadian Geoscience Map 143, 2013, 1 sheet,
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:125,000
ProjectionUniversal Transverse Mercator Projection, zone 13 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; shp; xml; xls; jpg; JPEG2000
AreaOverby Lake
Lat/Long WENS-106.0000 -104.0000 67.0000 66.0000
Subjectssurficial geology/geomorphology; glacial features; glacial deposits; glacial landforms; tills; sands; gravels; glaciolacustrine deposits; glaciofluvial deposits; organic deposits; alluvial deposits; colluvial deposits; eolian deposits; lacustrine deposits; moraines; marine deposits; Cenozoic; Quaternary
ProgramGeomapping for Energy & Minerals (GEM) - Geo-mapping Frontiers, GEM: Geo-mapping for Energy and Minerals
Released2013 09 26
AbstractPreliminary surficial geology studies, based on air photo interpretation and limited field data, were undertaken in the Overby Lake map area to provide an understanding of the distribution and nature of surficial materials, and regional glacial history. Much of the western area is characterized by rubble-covered bedrock containing shallow glacially scoured lake basins. Streamlined rock and till landforms indicate ice flow towards the northwest and north-northwest. Till blankets and veneers have a pebbly silty-sand matrix, but their surfaces tend to be bouldery where they were affected by glacial meltwater. Subglacial meltwater corridors consisting of eskers, washed till, boulder lags and scoured bedrock, cross the entire area. The MacAlpine Moraine in the southeast formed during glacial recession about 8200 years ago, and is defined by hummocky till, kames, and related glaciofluvial outwash. Sandy postglacial marine sediments extend up Ellice River to 220 m a.s.l. In the northeast, below 190 m a.s.l., silty marine deposits form extensive plains between drumlinoid ridges in the Queen Maud Bird Sanctuary.
Summary(Plain Language Summary, not published)
The Overby Lake map (NTS 76-I) identifies surficial materials and associated landforms left by the retreat of the last glaciers to have covered the area about 9000 years ago. The surficial geology is based on aerial photograph interpretation and limited previous 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 contributes to effective mineral exploration and supports informed decision making for resource development and land use.