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Cosmogenic 36Cl dating of the maximum limit of the Laurentide Ice Sheet in southwestern Alberta
Abstract
Cosmogenic 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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The chronology and viability of the interior corridor remain contentious, but it likely became ice-free between 15.0 and 13.0 ka, and viable sometime thereafter.
“The chronology and viability of this interior corridor remain contentious, but it likely became ice-free between 15.0 and 13.0 ka, and viable sometime thereafter (Heintzman et al., 2016;Hickin et al., 2015;Jackson et al., 1999;Munyikwa et al., 2017;Pedersen et al., 2016;B. A. Potter et al., 2017).”
From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Jackson et al., 1999
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Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation
Darvill, C. M., Menounos, B., Goehring, B. M., Lian, O. B., & Caffee, M. W. (2018) · Geophysical Research Letters · doi:10.1029/2018gl079419 · Cited by 105
Metadata
- Authors
- Jackson, Jr., Phillips, F. M., & Little, E. C.
- Venue
- Canadian Journal of Earth Sciences
- Publisher
- Canadian Science Publishing
- Published
- 1999
- Volume
- 36
- Issue
- 8
- Pages
- 1347-1356
- ISSN
- 1480-3313
- 0008-4077
- Cited by
- 2
- References
- 0
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