Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura
Medial moraines deposited by former glaciers and ice sheets are rare in Scotland. The most prominent example is the Sgriob na Caillich moraine, which consists of two to four parallel belts of angular quartzite boulders that extend northwestwards for over 3.5 km from the SW flank of Beinn an Oir on t...
Published in: | Scottish Geographical Journal |
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Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2019
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/scottish-landform-examples-45(6c9d1286-a3df-49f0-a699-e28fb892f2ac).html https://doi.org/10.1080/14702541.2019.1669812 https://research-repository.st-andrews.ac.uk/bitstream/10023/20642/1/Ballantyne_2019_SGJ_45_AAM.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/6c9d1286-a3df-49f0-a699-e28fb892f2ac 2024-06-23T07:53:46+00:00 Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura Ballantyne, Colin K. Dawson, Alastair G. 2019-09-18 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/scottish-landform-examples-45(6c9d1286-a3df-49f0-a699-e28fb892f2ac).html https://doi.org/10.1080/14702541.2019.1669812 https://research-repository.st-andrews.ac.uk/bitstream/10023/20642/1/Ballantyne_2019_SGJ_45_AAM.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/scottish-landform-examples-45(6c9d1286-a3df-49f0-a699-e28fb892f2ac).html info:eu-repo/semantics/openAccess Ballantyne , C K & Dawson , A G 2019 , ' Scottish landform examples 45 : Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura ' , Scottish Geographical Journal , vol. 135 , no. 1-2 , pp. 139-149 . https://doi.org/10.1080/14702541.2019.1669812 Medial moraines Rockfall Rock-slope failure Last Scottish Ice Sheet Isle of Jura article 2019 ftunstandrewcris https://doi.org/10.1080/14702541.2019.1669812 2024-06-13T01:08:14Z Medial moraines deposited by former glaciers and ice sheets are rare in Scotland. The most prominent example is the Sgriob na Caillich moraine, which consists of two to four parallel belts of angular quartzite boulders that extend northwestwards for over 3.5 km from the SW flank of Beinn an Oir on the Isle of Jura. The boulder belts extend to within 300 m of the present coastline, where they are truncated by a low bluff and raised marine terrace. The source of the moraine coincides with bedrock gullies and cliffs that represent the scars of former rock-slope failure(s), indicating that the moraine debris was sourced by one or more rockfalls or rockslides onto the ice surface after Beinn an Oir had emerged from the thinning ice cover as a nunatak. Exposure dating of boulders on the moraine indicate that it formed at 16.6 ± 0.8 ka, consistent with the timing of ice-sheet retreat in this sector. The alignment of the moraine indicates ice-margin retreat to the SE; as regional ice-sheet retreat across the adjacent offshore shelf was to the NE, this anomaly implies that a residual icefield became stranded on Jura during ice-sheet retreat. Article in Journal/Newspaper Ice Sheet University of St Andrews: Research Portal Jura ENVELOPE(13.501,13.501,68.062,68.062) Low Bluff ENVELOPE(178.983,178.983,51.583,51.583) Scottish Geographical Journal 135 1-2 139 149 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Medial moraines Rockfall Rock-slope failure Last Scottish Ice Sheet Isle of Jura |
spellingShingle |
Medial moraines Rockfall Rock-slope failure Last Scottish Ice Sheet Isle of Jura Ballantyne, Colin K. Dawson, Alastair G. Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura |
topic_facet |
Medial moraines Rockfall Rock-slope failure Last Scottish Ice Sheet Isle of Jura |
description |
Medial moraines deposited by former glaciers and ice sheets are rare in Scotland. The most prominent example is the Sgriob na Caillich moraine, which consists of two to four parallel belts of angular quartzite boulders that extend northwestwards for over 3.5 km from the SW flank of Beinn an Oir on the Isle of Jura. The boulder belts extend to within 300 m of the present coastline, where they are truncated by a low bluff and raised marine terrace. The source of the moraine coincides with bedrock gullies and cliffs that represent the scars of former rock-slope failure(s), indicating that the moraine debris was sourced by one or more rockfalls or rockslides onto the ice surface after Beinn an Oir had emerged from the thinning ice cover as a nunatak. Exposure dating of boulders on the moraine indicate that it formed at 16.6 ± 0.8 ka, consistent with the timing of ice-sheet retreat in this sector. The alignment of the moraine indicates ice-margin retreat to the SE; as regional ice-sheet retreat across the adjacent offshore shelf was to the NE, this anomaly implies that a residual icefield became stranded on Jura during ice-sheet retreat. |
format |
Article in Journal/Newspaper |
author |
Ballantyne, Colin K. Dawson, Alastair G. |
author_facet |
Ballantyne, Colin K. Dawson, Alastair G. |
author_sort |
Ballantyne, Colin K. |
title |
Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura |
title_short |
Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura |
title_full |
Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura |
title_fullStr |
Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura |
title_full_unstemmed |
Scottish landform examples 45:Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura |
title_sort |
scottish landform examples 45:sgriob na caillich: a landslide-sourced medial moraine on the isle of jura |
publishDate |
2019 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/scottish-landform-examples-45(6c9d1286-a3df-49f0-a699-e28fb892f2ac).html https://doi.org/10.1080/14702541.2019.1669812 https://research-repository.st-andrews.ac.uk/bitstream/10023/20642/1/Ballantyne_2019_SGJ_45_AAM.pdf |
long_lat |
ENVELOPE(13.501,13.501,68.062,68.062) ENVELOPE(178.983,178.983,51.583,51.583) |
geographic |
Jura Low Bluff |
geographic_facet |
Jura Low Bluff |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Ballantyne , C K & Dawson , A G 2019 , ' Scottish landform examples 45 : Sgriob na Caillich: a landslide-sourced medial moraine on the Isle of Jura ' , Scottish Geographical Journal , vol. 135 , no. 1-2 , pp. 139-149 . https://doi.org/10.1080/14702541.2019.1669812 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/scottish-landform-examples-45(6c9d1286-a3df-49f0-a699-e28fb892f2ac).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1080/14702541.2019.1669812 |
container_title |
Scottish Geographical Journal |
container_volume |
135 |
container_issue |
1-2 |
container_start_page |
139 |
op_container_end_page |
149 |
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1802645570555215872 |