Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains
Holocene glacial advances in the Banff–Jasper–Yoho area of the Canadian Rocky Mountains have been extremely limited in extent. Limiting 14 C dates from two sites within 1 km of contemporary glaciers of fresh terminal moraines indicate that the late Wisconsin Ice Sheet and valley glaciers disappeared...
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Cambridge University Press (CUP)
1979
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crcambridgeupr:10.1016/0033-5894(79)90069-3 2024-06-09T07:46:49+00:00 Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains Luckman, B. H. Osborn, G. D. 1979 http://dx.doi.org/10.1016/0033-5894(79)90069-3 http://api.elsevier.com/content/article/PII:0033589479900693?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589479900693?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030015 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 11, issue 1, page 52-77 ISSN 0033-5894 1096-0287 journal-article 1979 crcambridgeupr https://doi.org/10.1016/0033-5894(79)90069-3 2024-05-15T13:16:29Z Holocene glacial advances in the Banff–Jasper–Yoho area of the Canadian Rocky Mountains have been extremely limited in extent. Limiting 14 C dates from two sites within 1 km of contemporary glaciers of fresh terminal moraines indicate that the late Wisconsin Ice Sheet and valley glaciers disappeared prior to 9660 yr B.P. Two subsequent glacial advances are recognized. The earlier Crowfoot Advance is represented by moraines and rock-glacier deposits overlain by Mazama ash (6600 yr B.P.) and is therefore early Holocene or possibly late Wisconsin in age. The late Neoglacial Cavell Advance of the last few centuries is dated by dendrochronology and lichenometry. In addition, there is fragmentary, undated evidence of intermediate-age advance(s), mainly from rock-glacier deposits. All these advances were of limited extent (1–2 km beyond present ice margins) and the Cavell Advance was usually the most extensive. Major exceptions to this pattern occur only where rock glaciers or extensive ice-cored moraines developed during the earlier advance(s?). These deposits were not overrun by glaciers during the Cavell Advance because of their relatively greater downvalley extent and the physical barrier they presented to subsequent glacial advances. Earlier work which postulated more extensive early Holocene advances in the Canadian Rocky Mountains is shown to have inadequate dating control: Many of the features previously attributed to older Holocene events are late Wisconsin in age. Article in Journal/Newspaper Ice Sheet Cambridge University Press Quaternary Research 11 1 52 77 |
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English |
description |
Holocene glacial advances in the Banff–Jasper–Yoho area of the Canadian Rocky Mountains have been extremely limited in extent. Limiting 14 C dates from two sites within 1 km of contemporary glaciers of fresh terminal moraines indicate that the late Wisconsin Ice Sheet and valley glaciers disappeared prior to 9660 yr B.P. Two subsequent glacial advances are recognized. The earlier Crowfoot Advance is represented by moraines and rock-glacier deposits overlain by Mazama ash (6600 yr B.P.) and is therefore early Holocene or possibly late Wisconsin in age. The late Neoglacial Cavell Advance of the last few centuries is dated by dendrochronology and lichenometry. In addition, there is fragmentary, undated evidence of intermediate-age advance(s), mainly from rock-glacier deposits. All these advances were of limited extent (1–2 km beyond present ice margins) and the Cavell Advance was usually the most extensive. Major exceptions to this pattern occur only where rock glaciers or extensive ice-cored moraines developed during the earlier advance(s?). These deposits were not overrun by glaciers during the Cavell Advance because of their relatively greater downvalley extent and the physical barrier they presented to subsequent glacial advances. Earlier work which postulated more extensive early Holocene advances in the Canadian Rocky Mountains is shown to have inadequate dating control: Many of the features previously attributed to older Holocene events are late Wisconsin in age. |
format |
Article in Journal/Newspaper |
author |
Luckman, B. H. Osborn, G. D. |
spellingShingle |
Luckman, B. H. Osborn, G. D. Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains |
author_facet |
Luckman, B. H. Osborn, G. D. |
author_sort |
Luckman, B. H. |
title |
Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains |
title_short |
Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains |
title_full |
Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains |
title_fullStr |
Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains |
title_full_unstemmed |
Holocene Glacier Fluctuations in the Middle Canadian Rocky Mountains |
title_sort |
holocene glacier fluctuations in the middle canadian rocky mountains |
publisher |
Cambridge University Press (CUP) |
publishDate |
1979 |
url |
http://dx.doi.org/10.1016/0033-5894(79)90069-3 http://api.elsevier.com/content/article/PII:0033589479900693?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589479900693?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400030015 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary Research volume 11, issue 1, page 52-77 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(79)90069-3 |
container_title |
Quaternary Research |
container_volume |
11 |
container_issue |
1 |
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52 |
op_container_end_page |
77 |
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1801376821931933696 |