Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington
An ash layer that appears geochemically correlative with Mt. St. Helens tephra set S occurs in a sequence of Pleistocene lake sediments in the Ohop Valley of the southern Puget Lowland, below Vashon till deposited during the maximum late Pleistocene advance (Fraser Glaciation) of the Puget Lobe of t...
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Cambridge University Press (CUP)
1997
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Online Access: | http://dx.doi.org/10.1006/qres.1996.1877 http://api.elsevier.com/content/article/PII:S0033589496918773?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589496918773?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400032531 |
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crcambridgeupr:10.1006/qres.1996.1877 2024-06-09T07:46:46+00:00 Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington Begét, James E. Keskinen, Mary J. Severin, Kenneth P. 1997 http://dx.doi.org/10.1006/qres.1996.1877 http://api.elsevier.com/content/article/PII:S0033589496918773?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589496918773?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400032531 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 47, issue 2, page 140-146 ISSN 0033-5894 1096-0287 journal-article 1997 crcambridgeupr https://doi.org/10.1006/qres.1996.1877 2024-05-15T13:05:58Z An ash layer that appears geochemically correlative with Mt. St. Helens tephra set S occurs in a sequence of Pleistocene lake sediments in the Ohop Valley of the southern Puget Lowland, below Vashon till deposited during the maximum late Pleistocene advance (Fraser Glaciation) of the Puget Lobe of the Cordilleran Ice Sheet. The Puget Lobe reached its maximum southern extent ca. 14,000–14,500 yr B.P., and at least part of set S is evidently somewhat older. Previous radiocarbon and thermoluminescence dates for set S have ranged from 13,000 to 16,000 yr B.P. Geochemically correlative deposits of set S tephra occur in slackwater sediments coeval with the Missoula Floods in eastern Washington, produced by jökulhlaups through the Purcell Trench Lobe of the Cordilleran Ice Sheet. These relationships suggest that advances of glacier lobes on the southern margin of the Cordilleran Ice Sheet were nonsynchronous, as the Pucell Trench lobe east of the Cascade Range advanced to its maximum southern extent prior to the time of the eruption of set S, before the Puget Lobe west of the Cascades reached its maximum southern extent. Article in Journal/Newspaper Ice Sheet Cambridge University Press Quaternary Research 47 2 140 146 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
An ash layer that appears geochemically correlative with Mt. St. Helens tephra set S occurs in a sequence of Pleistocene lake sediments in the Ohop Valley of the southern Puget Lowland, below Vashon till deposited during the maximum late Pleistocene advance (Fraser Glaciation) of the Puget Lobe of the Cordilleran Ice Sheet. The Puget Lobe reached its maximum southern extent ca. 14,000–14,500 yr B.P., and at least part of set S is evidently somewhat older. Previous radiocarbon and thermoluminescence dates for set S have ranged from 13,000 to 16,000 yr B.P. Geochemically correlative deposits of set S tephra occur in slackwater sediments coeval with the Missoula Floods in eastern Washington, produced by jökulhlaups through the Purcell Trench Lobe of the Cordilleran Ice Sheet. These relationships suggest that advances of glacier lobes on the southern margin of the Cordilleran Ice Sheet were nonsynchronous, as the Pucell Trench lobe east of the Cascade Range advanced to its maximum southern extent prior to the time of the eruption of set S, before the Puget Lobe west of the Cascades reached its maximum southern extent. |
format |
Article in Journal/Newspaper |
author |
Begét, James E. Keskinen, Mary J. Severin, Kenneth P. |
spellingShingle |
Begét, James E. Keskinen, Mary J. Severin, Kenneth P. Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington |
author_facet |
Begét, James E. Keskinen, Mary J. Severin, Kenneth P. |
author_sort |
Begét, James E. |
title |
Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington |
title_short |
Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington |
title_full |
Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington |
title_fullStr |
Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington |
title_full_unstemmed |
Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington |
title_sort |
tephrochronologic constraints on the late pleistocene history of the southern margin of the cordilleran ice sheet, western washington |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1006/qres.1996.1877 http://api.elsevier.com/content/article/PII:S0033589496918773?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589496918773?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400032531 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary Research volume 47, issue 2, page 140-146 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1996.1877 |
container_title |
Quaternary Research |
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47 |
container_issue |
2 |
container_start_page |
140 |
op_container_end_page |
146 |
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1801376755527712768 |