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://discovery.dundee.ac.uk/en/publications/660c3c5e-df79-448d-9594-539e1c8f78e1 https://doi.org/10.1080/14702541.2019.1669812 http://www.scopus.com/inward/record.url?scp=85073590175&partnerID=8YFLogxK |
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ftunivdundeepure:oai:discovery.dundee.ac.uk:publications/660c3c5e-df79-448d-9594-539e1c8f78e1 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. 2019-04-03 https://discovery.dundee.ac.uk/en/publications/660c3c5e-df79-448d-9594-539e1c8f78e1 https://doi.org/10.1080/14702541.2019.1669812 http://www.scopus.com/inward/record.url?scp=85073590175&partnerID=8YFLogxK eng eng https://discovery.dundee.ac.uk/en/publications/660c3c5e-df79-448d-9594-539e1c8f78e1 info:eu-repo/semantics/closedAccess 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 Isle of Jura last Scottish Ice Sheet Medial moraines rock-slope failure rockfall /dk/atira/pure/subjectarea/asjc/3300/3305 name=Geography Planning and Development /dk/atira/pure/subjectarea/asjc/1900/1904 name=Earth-Surface Processes article 2019 ftunivdundeepure https://doi.org/10.1080/14702541.2019.1669812 2024-06-11T14:54:34Z 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 Discovery - University of Dundee Online Publications 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 |
Discovery - University of Dundee Online Publications |
op_collection_id |
ftunivdundeepure |
language |
English |
topic |
Isle of Jura last Scottish Ice Sheet Medial moraines rock-slope failure rockfall /dk/atira/pure/subjectarea/asjc/3300/3305 name=Geography Planning and Development /dk/atira/pure/subjectarea/asjc/1900/1904 name=Earth-Surface Processes |
spellingShingle |
Isle of Jura last Scottish Ice Sheet Medial moraines rock-slope failure rockfall /dk/atira/pure/subjectarea/asjc/3300/3305 name=Geography Planning and Development /dk/atira/pure/subjectarea/asjc/1900/1904 name=Earth-Surface Processes 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 |
Isle of Jura last Scottish Ice Sheet Medial moraines rock-slope failure rockfall /dk/atira/pure/subjectarea/asjc/3300/3305 name=Geography Planning and Development /dk/atira/pure/subjectarea/asjc/1900/1904 name=Earth-Surface Processes |
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://discovery.dundee.ac.uk/en/publications/660c3c5e-df79-448d-9594-539e1c8f78e1 https://doi.org/10.1080/14702541.2019.1669812 http://www.scopus.com/inward/record.url?scp=85073590175&partnerID=8YFLogxK |
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://discovery.dundee.ac.uk/en/publications/660c3c5e-df79-448d-9594-539e1c8f78e1 |
op_rights |
info:eu-repo/semantics/closedAccess |
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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1802645574966575104 |