Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland
Abstract Large‐scale streamlined glacial landforms are identified in 11 areas of northwest Scotland, from the Isle of Skye in the south to the Butt of Lewis in the north. These ice‐directional features occur in bedrock and superficial deposits, generally below 350 m above sea level, and where best d...
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crwiley:10.1002/jqs.1080 2024-06-02T08:08:18+00:00 Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland Bradwell, Tom Stoker, Martyn Larter, Rob 2007 http://dx.doi.org/10.1002/jqs.1080 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1080 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1080 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 22, issue 6, page 609-617 ISSN 0267-8179 1099-1417 journal-article 2007 crwiley https://doi.org/10.1002/jqs.1080 2024-05-03T11:24:32Z Abstract Large‐scale streamlined glacial landforms are identified in 11 areas of northwest Scotland, from the Isle of Skye in the south to the Butt of Lewis in the north. These ice‐directional features occur in bedrock and superficial deposits, generally below 350 m above sea level, and where best developed have elongation ratios of >20:1. Sidescan sonar and multibeam echo‐sounding data from The Minch show elongate streamlined ridges and grooves on the seabed, with elongation ratios of up to 70:1. These bedforms are interpreted as mega‐scale glacial lineations. All the features identified formed beneath The Minch palaeo‐ice stream which was ca. 200 km long, up to 50 km wide and drained ca. 15 000 km 2 of the northwest sector of the last British‐Irish Ice Sheet (Late Devensian Glaciation). Nine ice‐stream tributaries and palaeo‐onset zones are also identified, on the basis of geomorphological evidence. The spatial distribution and pattern of streamlined bedforms around The Minch has enabled the catchment, flow paths and basal shear stresses of the palaeo‐ice stream and its tributaries to be tentatively reconstructed. © British Geological Survey/Natural Environment Research Council copyright 2007. Reproduced with the permission of BGS/NERC. Published by John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice Sheet Wiley Online Library Journal of Quaternary Science 22 6 609 617 |
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English |
description |
Abstract Large‐scale streamlined glacial landforms are identified in 11 areas of northwest Scotland, from the Isle of Skye in the south to the Butt of Lewis in the north. These ice‐directional features occur in bedrock and superficial deposits, generally below 350 m above sea level, and where best developed have elongation ratios of >20:1. Sidescan sonar and multibeam echo‐sounding data from The Minch show elongate streamlined ridges and grooves on the seabed, with elongation ratios of up to 70:1. These bedforms are interpreted as mega‐scale glacial lineations. All the features identified formed beneath The Minch palaeo‐ice stream which was ca. 200 km long, up to 50 km wide and drained ca. 15 000 km 2 of the northwest sector of the last British‐Irish Ice Sheet (Late Devensian Glaciation). Nine ice‐stream tributaries and palaeo‐onset zones are also identified, on the basis of geomorphological evidence. The spatial distribution and pattern of streamlined bedforms around The Minch has enabled the catchment, flow paths and basal shear stresses of the palaeo‐ice stream and its tributaries to be tentatively reconstructed. © British Geological Survey/Natural Environment Research Council copyright 2007. Reproduced with the permission of BGS/NERC. Published by John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Bradwell, Tom Stoker, Martyn Larter, Rob |
spellingShingle |
Bradwell, Tom Stoker, Martyn Larter, Rob Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland |
author_facet |
Bradwell, Tom Stoker, Martyn Larter, Rob |
author_sort |
Bradwell, Tom |
title |
Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland |
title_short |
Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland |
title_full |
Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland |
title_fullStr |
Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland |
title_full_unstemmed |
Geomorphological signature and flow dynamics of The Minch palaeo‐ice stream, northwest Scotland |
title_sort |
geomorphological signature and flow dynamics of the minch palaeo‐ice stream, northwest scotland |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1002/jqs.1080 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1080 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1080 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Journal of Quaternary Science volume 22, issue 6, page 609-617 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.1080 |
container_title |
Journal of Quaternary Science |
container_volume |
22 |
container_issue |
6 |
container_start_page |
609 |
op_container_end_page |
617 |
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1800753509589581824 |