Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America

Abstract The use of shaded digital topographic models to visualizes suites of topographic features, stratigraphy, and field mapping reveals newly recognized multiple moraines associated with oscillations of the remnants of the Cordilleran Ice Sheet in the Fraser Lowland along the western Washington–...

Full description

Bibliographic Details
Published in:Quaternary Research
Main Authors: Kovanen, Dori J., Easterbrook, Don J.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2002
Subjects:
Ice Sheet
Online Access:http://dx.doi.org/10.1006/qres.2001.2307
http://api.elsevier.com/content/article/PII:S0033589401923075?httpAccept=text/xml
http://api.elsevier.com/content/article/PII:S0033589401923075?httpAccept=text/plain
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010747
id crcambridgeupr:10.1006/qres.2001.2307
record_format openpolar
spelling crcambridgeupr:10.1006/qres.2001.2307 2024-09-15T18:12:20+00:00 Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America Kovanen, Dori J. Easterbrook, Don J. 2002 http://dx.doi.org/10.1006/qres.2001.2307 http://api.elsevier.com/content/article/PII:S0033589401923075?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401923075?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010747 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 57, issue 2, page 208-224 ISSN 0033-5894 1096-0287 journal-article 2002 crcambridgeupr https://doi.org/10.1006/qres.2001.2307 2024-08-21T04:04:45Z Abstract The use of shaded digital topographic models to visualizes suites of topographic features, stratigraphy, and field mapping reveals newly recognized multiple moraines associated with oscillations of the remnants of the Cordilleran Ice Sheet in the Fraser Lowland along the western Washington–British Columbia border. Morphologic features show the extent of ice represented by Sumas Drift (ca. 11,600–10,000 14 C yr B.P.), following ca. 3000 yr of retreat from the glacial maximum (Fraser Glaciation) positions 80 km south of Seattle and in the Strait of Juan de Fuca. The paleogeography of the ice margin and timing of ice retreat during the Sumas Stade is reconstructed and bracketed by 70 radiocarbon dates (24 on marine shells, 46 on wood and peat), which are secured by morphologic and stratigraphic evidence. Four topographically distinct phases of the Sumas deglaciation model are suggested. Phase SI: 11,600–<11,400 14 C yr B.P., outermost drift, scattered remnants of ice-contact deposits Phase SII: 11,600–11,400 14 C yr B.P., glacier readvance, building prominent moraine followed by glacier retreat Phase SIII: 10,980–10,250 14 C yr B.P., glacier readvance building of multiple moraines followed by glacier retreat Phase SIV: >10,250–10,000? 14 C yr B.P., glacier readvance, building of inner moraine followed by glacier retreat Article in Journal/Newspaper Ice Sheet Cambridge University Press Quaternary Research 57 2 208 224
institution Open Polar
collection Cambridge University Press
op_collection_id crcambridgeupr
language English
description Abstract The use of shaded digital topographic models to visualizes suites of topographic features, stratigraphy, and field mapping reveals newly recognized multiple moraines associated with oscillations of the remnants of the Cordilleran Ice Sheet in the Fraser Lowland along the western Washington–British Columbia border. Morphologic features show the extent of ice represented by Sumas Drift (ca. 11,600–10,000 14 C yr B.P.), following ca. 3000 yr of retreat from the glacial maximum (Fraser Glaciation) positions 80 km south of Seattle and in the Strait of Juan de Fuca. The paleogeography of the ice margin and timing of ice retreat during the Sumas Stade is reconstructed and bracketed by 70 radiocarbon dates (24 on marine shells, 46 on wood and peat), which are secured by morphologic and stratigraphic evidence. Four topographically distinct phases of the Sumas deglaciation model are suggested. Phase SI: 11,600–<11,400 14 C yr B.P., outermost drift, scattered remnants of ice-contact deposits Phase SII: 11,600–11,400 14 C yr B.P., glacier readvance, building prominent moraine followed by glacier retreat Phase SIII: 10,980–10,250 14 C yr B.P., glacier readvance building of multiple moraines followed by glacier retreat Phase SIV: >10,250–10,000? 14 C yr B.P., glacier readvance, building of inner moraine followed by glacier retreat
format Article in Journal/Newspaper
author Kovanen, Dori J.
Easterbrook, Don J.
spellingShingle Kovanen, Dori J.
Easterbrook, Don J.
Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America
author_facet Kovanen, Dori J.
Easterbrook, Don J.
author_sort Kovanen, Dori J.
title Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America
title_short Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America
title_full Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America
title_fullStr Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America
title_full_unstemmed Timing and Extent of Allerød and Younger Dryas Age (ca. 12,500–10,000 14 C yr B.P.) Oscillations of the Cordilleran Ice Sheet in the Fraser Lowland, Western North America
title_sort timing and extent of allerød and younger dryas age (ca. 12,500–10,000 14 c yr b.p.) oscillations of the cordilleran ice sheet in the fraser lowland, western north america
publisher Cambridge University Press (CUP)
publishDate 2002
url http://dx.doi.org/10.1006/qres.2001.2307
http://api.elsevier.com/content/article/PII:S0033589401923075?httpAccept=text/xml
http://api.elsevier.com/content/article/PII:S0033589401923075?httpAccept=text/plain
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010747
genre Ice Sheet
genre_facet Ice Sheet
op_source Quaternary Research
volume 57, issue 2, page 208-224
ISSN 0033-5894 1096-0287
op_rights https://www.cambridge.org/core/terms
op_doi https://doi.org/10.1006/qres.2001.2307
container_title Quaternary Research
container_volume 57
container_issue 2
container_start_page 208
op_container_end_page 224
_version_ 1810449914939834368

Similar Items