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TitleQuaternary geology of the Frances Lake map area, Yukon and Northwest Territories
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDyke, A S
SourceGeological Survey of Canada, Memoir 426, 1990, 39 pages (5 sheets), (Open Access)
MapsPublication contains 5 maps
Map Info.surficial geology, landforms, 1:100,000
Map Info.geological, paleogeography, 1:250,000
Mediapaper; on-line; digital
RelatedThis publication contains the following publications
File formatpdf
ProvinceYukon; Northwest Territories
AreaFrances Lake; Dolly Varden Creek; Frances River; Yusezyu River; Little Hyland River
Lat/Long WENS-130.0000 -128.0000 62.0000 61.0000
Subjectssurficial geology/geomorphology; geochemistry; glacial history; glaciers; glaciation; deglaciation; erosion; ice movement; ice movement directions; wisconsinian glacial stage; glacial stages; tills; alluvial deposits; glaciofluvial deposits; rock glaciers; landforms; glacial deposits; lithofacies; facies; moraines; trace element analyses; analyses; geochemical analyses; till geochemistry; glaciolacustrine deposits; colluvial deposits; landslides; Anvil Allochthon; Selwyn Fold Belt, Mack; Mcconnell Glacial Stage; Quaternary
Illustrationssketch maps; rose diagrams; photographs; charts; histograms; analyses
Released1991 01 01; 2014 07 24
AbstractThe Quaternary geology of the Frances Lake map area described herein is based on the first detailed mapping (1:100 000 scale) in the area. This part of the northeastern Cordillera was eroded by alpine cirque glaciers throughout much of the Quaternary. However, almost all surficial deposits and smaller landforms result from complete glaciation by ice flowing southward from the Logan Mountains during the Late Wisconsinan and from postglacial, alpine, slope processes. Till, the dominant surficial material, is subdivided into several lithic facies that differ widely in clast lithology and more subtly in grain size and geochemical composition. Glaciofluvial and alluvial deposits are thick and nearly continuous along most valleys and thick glaciolacustrine deposits occur in two eastern valleys. Alpine slope processes have produced extensive talus aprons and many rock glaciers derived from them as well as some rock and numerous snow avalanches. Widespread rock glacier development occurred about 4500 years ago with resurgences at several times since. Several glacial advances occurred during the last 400 years. Late Wisconsinan deglaciation was marked by large, lowland ice lobes that retreated northward accompanied by segregation from alpine glaciers. Both types of glaciers left an abundant geomorphological record but deglaciation remains undated.

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