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TitleCosmogenic 36CI dating of the maximum limit of the Laurentide Ice Sheet in southwestern Alberta
AuthorJackson, L E; Phillips, F M; Little, E CORCID logo
SourceCanadian Journal of Earth Sciences vol. 36, no. 8, 1999 p. 1347-1356,
Alt SeriesGeological Survey of Canada, Contribution Series 1997085
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf
NTS82G/01; 82G/08; 82G/09; 82G/16; 82H/03; 82H/04; 82H/05; 82H/06; 82H/12; 82H/13; 82J/01
Areasouthwestern Alberta; Cardston
Lat/Long WENS-114.5000 -113.0000 50.3333 49.0000
Subjectssurficial geology/geomorphology; geochronology; ice movement; ice margins; ice sheets; erratics; radiometric dating; chlorine; Laurentide Ice Sheet
Illustrationssketch maps; photographs; tables
Released1999 08 21
AbstractCosmogenic 36Cl ages were determined on 11 glacial erratics from the summits of Porcupine Hills and Cloudy Ridge, Waterton valley, and the Foothills south of Cardston, Alberta. These erratics were derived from the Canadian Shield and the Rocky Mountains of the Waterton area. They were laid down by (1) the most extensive advance of a Canadian Shield centred continental ice sheet into this region (stratigraphically oldest glacial deposits); (2) a montane glacial advance from the Waterton valley (stratigraphically intermediate glacial deposits); and (3) an advance of continental glacial ice that overrode deposits of the intermediate-age montane advance. Zero erosion rate 36Cl ages of the erratics, uncorrected for snow cover, range between about 12 and 18 ka. They support the hypothesis that the Laurentide Ice Sheet reached farther into the southwestern Foothills than did all the previous continental ice sheets.

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