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TitleLate Cenozoic geology, Ancient Pacific Margin NATMAP Project, report 2: survey of placer-gravel lithology and exploration of glacial limits along the Yukon and Stewart rivers, Yukon Territory
AuthorJackson, L E, Jr; Huscroft, C A
SourceGeological Survey of Canada, Current Research (Online) no. 2000-A3, 2000.,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (2000). Current Research 2000, Geological Survey of Canada, Current Research (Online) no. 2000-ABCDE
File formatpdf
NTS115J/14; 115J/15; 115J/16; 115O/01; 115O/02; 115O/03
AreaYukon River; Thistle Mountain; Mount Stewart
Lat/Long WENS-139.5000 -138.0000 63.2500 62.7500
Subjectssurficial geology/geomorphology; economic geology; metallic minerals; erratics; placer deposits; mineralization; gold; gravels; bedrock geology; glacial deposits; ice sheets; glaciation; lithology; Quaternary
Illustrationssketch maps; photographs
ProgramAncient Pacific Margin NATMAP Project
Released2000 01 01
AbstractThe lithology of placer gravels and indicators of glaciation were investigated in drainage basins near Mount Stewart, Thistle Mountain, and Selwyn Dome, west-central Yukon Territory. The composition of placer gravel indicates that mafic and felsic volcanic and subvolcanic rocks, unrecognized on existing bedrock geology maps, outcrop or suboutcrop in the area. Similar rocks host precious and base-metal deposits in the nearby Dawson Range. Ultramafic rocks are more extensive in the study area than previously thought. The presence of large erratic boulders suggests that the area may have been glaciated during the early Pleistocene.