Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade?
Recent research based primarily on exposure ages of boulders on moraines has suggested that extensive ice masses persisted in fjords and across low ground in NW Scotland throughout the Lateglacial Interstade (≈ Greenland Interstade 1 (GI-1), ca. 14.7-12.9 ka), and that glacier ice was much more exte...
Published in: | Journal of Quaternary Science |
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2012
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/did-large-ice-caps-persist-on-low-ground-in-northwest-scotland-during-the-lateglacial-interstade(ea00d4ce-69e2-4064-b49d-8ec55d366746).html https://doi.org/10.1002/jqs.1544 |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/ea00d4ce-69e2-4064-b49d-8ec55d366746 2024-06-23T07:53:02+00:00 Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? Ballantyne, Colin Stone, John 2012-04 https://research-portal.st-andrews.ac.uk/en/researchoutput/did-large-ice-caps-persist-on-low-ground-in-northwest-scotland-during-the-lateglacial-interstade(ea00d4ce-69e2-4064-b49d-8ec55d366746).html https://doi.org/10.1002/jqs.1544 eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/did-large-ice-caps-persist-on-low-ground-in-northwest-scotland-during-the-lateglacial-interstade(ea00d4ce-69e2-4064-b49d-8ec55d366746).html info:eu-repo/semantics/restrictedAccess Ballantyne , C & Stone , J 2012 , ' Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? ' , Journal of Quaternary Science , vol. 27 , no. 3 , pp. 297-306 . https://doi.org/10.1002/jqs.1544 article 2012 ftunstandrewcris https://doi.org/10.1002/jqs.1544 2024-06-13T00:31:31Z Recent research based primarily on exposure ages of boulders on moraines has suggested that extensive ice masses persisted in fjords and across low ground in NW Scotland throughout the Lateglacial Interstade (≈ Greenland Interstade 1 (GI-1), ca. 14.7-12.9 ka), and that glacier ice was much more extensive in this area during the Older Dryas chronozone (ca. 14.0 ka) than during the Younger Dryas Stade (ca. 12.9-11.7 ka). We have recalibrated the same exposure age data using locally-derived 10Be production rates. This increases the original mean ages by 6.5-12%, implying moraine deposition between ca. 14.3 ka and ca. 15.1 ka, and we infer a most probable age of ca. 14.7 ka based on palaeoclimatic considerations. The internal consistency of the ages implies that the dated moraines represent a single readvance of the ice margin (the Wester Ross Readvance). Pollen-stratigraphic evidence from a Lateglacial site at Loch Droma on the present drainage divide demonstrates deglaciation before ca. 14.0 ka, and therefore implies extensive deglaciation of all low ground and fjords in this area during the first half of the interstade (ca. 14.7–14.0 ka). This inference appears consistent with Lateglacial radiocarbon dates for shells recovered from glacimarine sediments and a dated tephra layer. Our revised chronology conflicts with earlier proposals that substantial dynamic ice caps persisted in Scotland between 14 ka and 13 ka, that large active glaciers probably survived throughout the Lateglacial Interstade and that ice extent was greater during the Older Dryas period than during the Younger Dryas Stade. Article in Journal/Newspaper glacier Greenland University of St Andrews: Research Portal Greenland Journal of Quaternary Science 27 3 297 306 |
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Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
description |
Recent research based primarily on exposure ages of boulders on moraines has suggested that extensive ice masses persisted in fjords and across low ground in NW Scotland throughout the Lateglacial Interstade (≈ Greenland Interstade 1 (GI-1), ca. 14.7-12.9 ka), and that glacier ice was much more extensive in this area during the Older Dryas chronozone (ca. 14.0 ka) than during the Younger Dryas Stade (ca. 12.9-11.7 ka). We have recalibrated the same exposure age data using locally-derived 10Be production rates. This increases the original mean ages by 6.5-12%, implying moraine deposition between ca. 14.3 ka and ca. 15.1 ka, and we infer a most probable age of ca. 14.7 ka based on palaeoclimatic considerations. The internal consistency of the ages implies that the dated moraines represent a single readvance of the ice margin (the Wester Ross Readvance). Pollen-stratigraphic evidence from a Lateglacial site at Loch Droma on the present drainage divide demonstrates deglaciation before ca. 14.0 ka, and therefore implies extensive deglaciation of all low ground and fjords in this area during the first half of the interstade (ca. 14.7–14.0 ka). This inference appears consistent with Lateglacial radiocarbon dates for shells recovered from glacimarine sediments and a dated tephra layer. Our revised chronology conflicts with earlier proposals that substantial dynamic ice caps persisted in Scotland between 14 ka and 13 ka, that large active glaciers probably survived throughout the Lateglacial Interstade and that ice extent was greater during the Older Dryas period than during the Younger Dryas Stade. |
format |
Article in Journal/Newspaper |
author |
Ballantyne, Colin Stone, John |
spellingShingle |
Ballantyne, Colin Stone, John Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? |
author_facet |
Ballantyne, Colin Stone, John |
author_sort |
Ballantyne, Colin |
title |
Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? |
title_short |
Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? |
title_full |
Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? |
title_fullStr |
Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? |
title_full_unstemmed |
Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? |
title_sort |
did large ice caps persist on low ground in north-west scotland during the lateglacial interstade? |
publishDate |
2012 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/did-large-ice-caps-persist-on-low-ground-in-northwest-scotland-during-the-lateglacial-interstade(ea00d4ce-69e2-4064-b49d-8ec55d366746).html https://doi.org/10.1002/jqs.1544 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland |
genre_facet |
glacier Greenland |
op_source |
Ballantyne , C & Stone , J 2012 , ' Did large ice caps persist on low ground in north-west Scotland during the Lateglacial Interstade? ' , Journal of Quaternary Science , vol. 27 , no. 3 , pp. 297-306 . https://doi.org/10.1002/jqs.1544 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/did-large-ice-caps-persist-on-low-ground-in-northwest-scotland-during-the-lateglacial-interstade(ea00d4ce-69e2-4064-b49d-8ec55d366746).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/jqs.1544 |
container_title |
Journal of Quaternary Science |
container_volume |
27 |
container_issue |
3 |
container_start_page |
297 |
op_container_end_page |
306 |
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