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TitleSurficial geology, Nechako River, British Columbia
AuthorPlouffe, A; Levson, V M; Mate, D J
SourceGeological Survey of Canada, "A" Series Map 2067A, 2004, 1 sheet; 1 CD-ROM,
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:250,000
Mediapaper; CD-ROM; digital; on-line
File formatreadme / lisez-moi
File formate00; shp; pdf; JPEG2000
ProvinceBritish Columbia
AreaNechako River
Lat/Long WENS-126.0000 -124.0000 54.0000 53.0000
Subjectssurficial geology/geomorphology; glacial deposits; alluvial deposits; organic deposits; deltaic deposits; colluvial deposits; glaciolacustrine deposits; glaciofluvial deposits; tills; sands; silts; gravels; clays; glacial features; glacial landforms; drumlins; glacial history; ice flow; ice movement directions; Fraser Glaciation; Wisconsinan Glaciation; Cenozoic; Quaternary
ProgramNechako NATMAP Project
LinksMetadata - Métadonnées
Released2004 11 01; 2005 03 01
AbstractThe surficial geology of the Nechako River map area (NTS 93F) depicts the distribution of unconsolidated glacial and nonglacial sediments and landforms. This A-series map was compiled, modified and generalized from previously published open files produced by
the Geological Survey of Canada and the British Columbia Geological Survey. The map shows a variety of units of glacial and non-glacial origin. From oldest to youngest, the units on the map include bedrock and till and, glaciofluvial, glaciolacustrine, colluvial, alluvial, organic, and anthropogenic deposits. Till is the most areally extensive surficial deposit in the map area. It consists of a poorly sorted sediment directly deposited by glaciers, containing boulder- to pebble-sized clasts in a matrix of sand, silt, and clay. Glaciofluvial deposits generally consist of sand and gravel which can represent aggregate resources, but their quality for such usage depends on the sediment sorting and the induration of the clast lithologies. Glaciolacustrine deposits are composed of well sorted fine sand, silt, and clay. These sediments were deposited in former glacial lakes that developed at the end of the last glaciation when the drainage was blocked by decaying ice masses. Colluvial deposits represent sediments reworked by mass-wasting processes in steep terrain. Alluvial deposits
(sediments of modern streams) are present along all streams in the region but only in the larger ones are such deposits extensive enough to be mapped. Organic deposits accumulate in poorly drained depressions in sediments and bedrock. They are particularly abundant in regions underlain by impermeable till, in valleys with underfit streams, and within low-gradient meltwater channels. Anthropogenic deposits, consisting of sediments reworked by human activities, were only mapped at the Kenney Dam site. A variety of glacial and non-glacial landforms are represented on the map. They provide and indication of the glacial and non-glacial history of the region. More details on the surficial geology and ice-flow history of the region is provided as marginal notes on the map.