High‐resolution reconstruction of the last ice sheet in NW Scotland
Reconstructions of the last (late Devensian) British ice sheet have hitherto been based on assumptions regarding its extent and form. Here we employ observational evidence for the maximum altitude of glacial erosion (trimlines) on mountains that protruded through the ice (palaeonunataks) to reconstr...
Published in: | Terra Nova |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1998
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1046/j.1365-3121.1998.00168.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1998.00168.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1998.00168.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-3121.1998.00168.x |
id |
crwiley:10.1046/j.1365-3121.1998.00168.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1046/j.1365-3121.1998.00168.x 2024-06-02T08:08:05+00:00 High‐resolution reconstruction of the last ice sheet in NW Scotland Ballantyne McCarroll Nesje Dahl Stone Fifield 1998 http://dx.doi.org/10.1046/j.1365-3121.1998.00168.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1998.00168.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1998.00168.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-3121.1998.00168.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 10, issue 2, page 63-67 ISSN 0954-4879 1365-3121 journal-article 1998 crwiley https://doi.org/10.1046/j.1365-3121.1998.00168.x 2024-05-03T11:35:49Z Reconstructions of the last (late Devensian) British ice sheet have hitherto been based on assumptions regarding its extent and form. Here we employ observational evidence for the maximum altitude of glacial erosion (trimlines) on mountains that protruded through the ice (palaeonunataks) to reconstruct the form of the ice sheet over ≈ 10 000 km 2 of NW Scotland. Contrasts in the clay mineralogy of soils and exposure ages of rock surfaces above and below these trimlines confirm that they represent the upper limit of late Devensian glacial erosion. The reconstruction yields realistic values of basal shear stress and is consistent with independent evidence of ice movement directions. The ice sheet reached ≈ 950 m altitude over the present N–S watershed, descended northwards and north‐westwards, was deflected around an ice dome on Skye and an independent Outer Hebrides ice cap, and probably extended across the adjacent shelf on a bed of deforming sediments. Article in Journal/Newspaper Ice cap Ice Sheet Wiley Online Library Terra Nova 10 2 63 67 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Reconstructions of the last (late Devensian) British ice sheet have hitherto been based on assumptions regarding its extent and form. Here we employ observational evidence for the maximum altitude of glacial erosion (trimlines) on mountains that protruded through the ice (palaeonunataks) to reconstruct the form of the ice sheet over ≈ 10 000 km 2 of NW Scotland. Contrasts in the clay mineralogy of soils and exposure ages of rock surfaces above and below these trimlines confirm that they represent the upper limit of late Devensian glacial erosion. The reconstruction yields realistic values of basal shear stress and is consistent with independent evidence of ice movement directions. The ice sheet reached ≈ 950 m altitude over the present N–S watershed, descended northwards and north‐westwards, was deflected around an ice dome on Skye and an independent Outer Hebrides ice cap, and probably extended across the adjacent shelf on a bed of deforming sediments. |
format |
Article in Journal/Newspaper |
author |
Ballantyne McCarroll Nesje Dahl Stone Fifield |
spellingShingle |
Ballantyne McCarroll Nesje Dahl Stone Fifield High‐resolution reconstruction of the last ice sheet in NW Scotland |
author_facet |
Ballantyne McCarroll Nesje Dahl Stone Fifield |
author_sort |
Ballantyne |
title |
High‐resolution reconstruction of the last ice sheet in NW Scotland |
title_short |
High‐resolution reconstruction of the last ice sheet in NW Scotland |
title_full |
High‐resolution reconstruction of the last ice sheet in NW Scotland |
title_fullStr |
High‐resolution reconstruction of the last ice sheet in NW Scotland |
title_full_unstemmed |
High‐resolution reconstruction of the last ice sheet in NW Scotland |
title_sort |
high‐resolution reconstruction of the last ice sheet in nw scotland |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1046/j.1365-3121.1998.00168.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-3121.1998.00168.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-3121.1998.00168.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-3121.1998.00168.x |
genre |
Ice cap Ice Sheet |
genre_facet |
Ice cap Ice Sheet |
op_source |
Terra Nova volume 10, issue 2, page 63-67 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-3121.1998.00168.x |
container_title |
Terra Nova |
container_volume |
10 |
container_issue |
2 |
container_start_page |
63 |
op_container_end_page |
67 |
_version_ |
1800753240889884672 |