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TitleSurficial geology, Thinahtea Lake, British Columbia
AuthorBednarski, J M
SourceGeological Survey of Canada, Open File 5479, 2008, 1 sheet; 1 CD-ROM, (Open Access)
LinksMetadata - Métadonnées
PublisherNatural Resources Canada
Documentopen file
Maps1 map
Map Info.surficial geology, surficial materials and landforms, 1:50,000
Mediapaper; CD-ROM; digital; on-line
File formatreadme / lisez-moi
File formate00 (ESRI® ArcExplorer(TM) v. 2.0 is included / est fourni); shp; tif; pdf; JPEG2000
ProvinceBritish Columbia
AreaTinahtea Lake; Zeues Lake; Zeues Creek; Thinahtea Creek; Petitot River; Hostli Lake
Lat/Long WENS-120.5000 -120.0000 59.7500 59.5000
Subjectssurficial geology/geomorphology; glaciation; deglaciation; postglacial deposits; glacial deposits; proglacial deposits; glaciolacustrine deposits; proglacial lake deposits; glaciofluvial deposits; colluvial deposits; alluvial deposits; lacustrine deposits; fluvial deposits; ice margins; ice contact deposits; outwash; outwash plains; outwash deltas; outwash fans; meltwater channels; kettles; mass wasting; landslide deposits; slumps; solifluction; flood plains; terraces; deltaic sediments; alluvial fans; alluvium; organic deposits; peat bogs; swamps; fens; hummocks; permafrost; ground ice; thermokarst; sands; gravels; silts; clays; glacial features; glacial landforms; tills; drumlins; erratics; carbonate rocks; glacial flutings; moraines; till ridges; eskers; crevasses; ice movement directions; sedimentary rocks; sandstones; shales; glacial stages; Wisconsinian glacial stage; paleotopography; shoreline changes; Dunvegan Formation; Fort St. John Group; Shaftesbury Formation; Laurentide Ice Sheet; Phanerozoic; Cenozoic; Quaternary; Mesozoic; Cretaceous
ProgramTargeted Geoscience Initiative (TGI-2), 2003-2005
Released2008 04 01
AbstractThe surficial geology of the Thinahtea Lake (NTS 94 P/9) map area is dominated by the effects of continental glaciation during the Late Wisconsinan (ca. 25 000-10 000 years ago). In general the ice sheet advanced from the northeast, but the ice thinned during deglaciation and divided into distinct lobes. The map area became dominated by one lobe flowing southward from the Mackenzie River valley in the north, and a second lobe in the south, occupying the Shekilie River. Glacial flutings in the northern part of the map area record the southern flow of the northern lobe. Thinahtea Lake itself occupies a large meltwater channel that was probably the mouth of a large subglacial tunnel emanating from the northern ice lobe. Numerous eskers lie along the northern edge of the lake. Initially the northern and southern lobes were in contact along an area of hummocky moraine, just south of the Petitot River, but once they separated meltwater collected between the lobes along the lowland occupied by the modern Petitot River with drainage to the west. The western part of the Petitot River valley, however, was initially occupied by the northern ice lobe and the main drainage was forced southward along the northern margin of the Etsho Plateau. The Petitot River did not occupy its present course until the northern ice lobe retreated northward. Much of the map area is underlain by thick clayey till and glaciolacustrine deposits, which are poorly drained and covered by extensive muskeg. Areas of thick peat are likely underlain by permafrost and probably contain significant amounts of ground ice.