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TitleSurficial geology, Etset Lake, British Columbia
AuthorBednarski, J M
SourceGeological Survey of Canada, Open File 5506, 2007, 1 sheet; 1 CD-ROM, (Open Access)
LinksMetadata - Métadonnées
PublisherNatural Resources Canada
Documentopen file
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:50,000
Mediapaper; CD-ROM; digital; on-line
File formatreadme / lisez-moi
File formate00 (ESRI® ArcExplorer v. 2.0 is included / est fourni); shp; pdf; JPEG2000
ProvinceBritish Columbia
AreaEtset Lake; Petitot River; Sahdoanah Creek; 2
Lat/Long WENS-121.5000 -121.0000 59.7500 59.5000
Subjects2; surficial geology/geomorphology; glacial deposits; glaciolacustrine deposits; glaciofluvial deposits; tills; alluvial deposits; fluvial deposits; lacustrine deposits; colluvial deposits; organic deposits; glacial features; glacial landforms; moraines; glacial history; Wisconsinan Glaciation; 7; Cenozoic; Quaternary
ProgramNorthern Resources Development Program
Released2007 10 01
AbstractEtset Lake (NTS 94P/11) map area was glaciated by the Laurentide Ice Sheet during the Late Wisconsinan (ca. 25 000-10 000 years ago), which deposited clayey till over most of the area. Glacial flutings in the east central part of the map area record the ice flow from the north-northeast. Much of the area is now flat and boggy, with peat accumulations of 2 to 3 m that form hummocky terrain underlain by discontinuous permafrost. Till underlies the surface of broad forested uplands. The uplands are usually only a few metres above the surrounding wetlands. Deglaciation was recorded by numerous small moraines and crevasse-fill ridges that mark the pattern of glacial retreat as the ice sheet thinned and the margin became lobed. A tongue of ice persisted in the broad lowland incised by the modern Petitot River. Meltwater issuing from the retreating ice margin cut several large channels trending northwest across the map area. The largest of these, now occupied by Sahdoanah Creek, was the main drainage when Petitot River to the north was still covered by ice. These former meltwater channels can have significant, but localized, accumulations of glaciofluvial gravels.