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Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits

Danny McCarroll

Scottish Geographical Journal, Volume: 132, Issue: 2, Pages: 130 - 139

Swansea University Author: Danny McCarroll

DOI (Published version): 10.1080/14702541.2016.1157203

Abstract

Trimlines mark the boundary between glacially eroded landscapes on low ground and landscapes dominated by evidence of periglacial weathering on higher summits. For many years the trimlines of Scandinavia, Britain and Ireland have been interpreted as marking the surface of the ice sheets at the maxim...

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Published in: Scottish Geographical Journal
Published: 2016
Online Access: http://dx.doi.org/10.1080/14702541.2016.1157203
URI: https://cronfa.swan.ac.uk/Record/cronfa26444
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spelling 2017-04-05T14:57:53.2168625 v2 26444 2016-02-19 Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits 6d181d926aaac8932c2bfa8d0e7f6960 Danny McCarroll Danny McCarroll true false 2016-02-19 FGSEN Trimlines mark the boundary between glacially eroded landscapes on low ground and landscapes dominated by evidence of periglacial weathering on higher summits. For many years the trimlines of Scandinavia, Britain and Ireland have been interpreted as marking the surface of the ice sheets at the maximum of the last glaciation, but recent cosmogenic exposure dating of erratics far above the trimlines in NW Scotland show this to be false. The trimlines in that area must represent an englacial thermal boundary between warm (eroding) ice and cold (protecting) ice. It is now clear that even very experienced geomorphologists cannot necessarily tell the difference between terrain that has been recently glaciated and terrain that has not, because cold based ice can leave virtually no trace. This calls into question not only the interpretation of high level trimines elsewhere, but also the mapping of the lateral limits of past glaciations, which are often based on similar or even weaker geomorphological and sedimentological evidence. Journal Article Scottish Geographical Journal 132 2 130 139 Glaciation, Devensian, Weichselian, Weathering, Blockfields, 31 12 2016 2016-12-31 10.1080/14702541.2016.1157203 http://dx.doi.org/10.1080/14702541.2016.1157203 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2017-04-05T14:57:53.2168625 2016-02-19T08:51:47.6756933 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Danny McCarroll 1 0026444-26022017164254.pdf TrimlineTrauma.pdf 2017-02-26T16:42:54.7770000 Output 342637 application/pdf Accepted Manuscript true 2018-08-19T00:00:00.0000000 false eng
title Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits
spellingShingle Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits
Danny McCarroll
title_short Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits
title_full Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits
title_fullStr Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits
title_full_unstemmed Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits
title_sort Trimline Trauma: The Wider Implications of a Paradigm Shift in Recognising and Interpreting Glacial Limits
author_id_str_mv 6d181d926aaac8932c2bfa8d0e7f6960
author_id_fullname_str_mv 6d181d926aaac8932c2bfa8d0e7f6960_***_Danny McCarroll
author Danny McCarroll
author2 Danny McCarroll
format Journal article
container_title Scottish Geographical Journal
container_volume 132
container_issue 2
container_start_page 130
publishDate 2016
institution Swansea University
doi_str_mv 10.1080/14702541.2016.1157203
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
url http://dx.doi.org/10.1080/14702541.2016.1157203
document_store_str 1
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description Trimlines mark the boundary between glacially eroded landscapes on low ground and landscapes dominated by evidence of periglacial weathering on higher summits. For many years the trimlines of Scandinavia, Britain and Ireland have been interpreted as marking the surface of the ice sheets at the maximum of the last glaciation, but recent cosmogenic exposure dating of erratics far above the trimlines in NW Scotland show this to be false. The trimlines in that area must represent an englacial thermal boundary between warm (eroding) ice and cold (protecting) ice. It is now clear that even very experienced geomorphologists cannot necessarily tell the difference between terrain that has been recently glaciated and terrain that has not, because cold based ice can leave virtually no trace. This calls into question not only the interpretation of high level trimines elsewhere, but also the mapping of the lateral limits of past glaciations, which are often based on similar or even weaker geomorphological and sedimentological evidence.
published_date 2016-12-31T03:31:44Z
_version_ 1763751288551505920
score 11.035634

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