Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK
ABSTRACT The British Isles have been affected by as many as 30 glaciations during the Quaternary. However, the evidence for pre‐Devensian glaciations in upland regions is scarce. Understanding the extent and timing of earlier upland glaciations is essential for modelling the long‐term evolution and...
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crwiley:10.1002/jqs.2751 2024-06-02T08:08:18+00:00 Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK FARRANT, ANDREW R. SMITH, CHRISTOPHER J. M. NOBLE, STEPHEN R. SIMMS, MICHAEL J. RICHARDS, DAVID A. 2014 http://dx.doi.org/10.1002/jqs.2751 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2751 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2751 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 29, issue 8, page 815-826 ISSN 0267-8179 1099-1417 journal-article 2014 crwiley https://doi.org/10.1002/jqs.2751 2024-05-03T11:26:01Z ABSTRACT The British Isles have been affected by as many as 30 glaciations during the Quaternary. However, the evidence for pre‐Devensian glaciations in upland regions is scarce. Understanding the extent and timing of earlier upland glaciations is essential for modelling the long‐term evolution and sensitivity of the British Ice Sheet. Caves, being protected from surface erosion and weathering, can preserve evidence of earlier glaciations in the form of speleothem and sediment archives. The ∼70‐km‐long Ogof Draenen cave system in South Wales, UK, contains multiple cave levels related to changes in the surface topography and drainage during the past 0.5 Ma. The cave contains evidence of massive influxes of sediment that were sufficient to choke the cave and alter the underground drainage. Analysis of the cave sediments, passage morphology and geometry suggests the cave once acted as a subterranean glacial spill‐way before being overridden by ice. Speleothem U‐series data demonstrate that this sediment influx occurred before Marine Isotope State (MIS) 9, probably during the Anglian glaciation (MIS 12). Evidence from Ogof Draenen indicates the impact of subsequent glaciations on the landscape evolution of the region was minimal and that much of the surface topography dates from the Anglian. Copyright © 2014 British Geological Survey (NERC). Journal of Quaternary Science © 2014 John Wiley & Sons Ltd. Article in Journal/Newspaper Ice Sheet Wiley Online Library Journal of Quaternary Science 29 8 815 826 |
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Open Polar |
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Wiley Online Library |
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English |
description |
ABSTRACT The British Isles have been affected by as many as 30 glaciations during the Quaternary. However, the evidence for pre‐Devensian glaciations in upland regions is scarce. Understanding the extent and timing of earlier upland glaciations is essential for modelling the long‐term evolution and sensitivity of the British Ice Sheet. Caves, being protected from surface erosion and weathering, can preserve evidence of earlier glaciations in the form of speleothem and sediment archives. The ∼70‐km‐long Ogof Draenen cave system in South Wales, UK, contains multiple cave levels related to changes in the surface topography and drainage during the past 0.5 Ma. The cave contains evidence of massive influxes of sediment that were sufficient to choke the cave and alter the underground drainage. Analysis of the cave sediments, passage morphology and geometry suggests the cave once acted as a subterranean glacial spill‐way before being overridden by ice. Speleothem U‐series data demonstrate that this sediment influx occurred before Marine Isotope State (MIS) 9, probably during the Anglian glaciation (MIS 12). Evidence from Ogof Draenen indicates the impact of subsequent glaciations on the landscape evolution of the region was minimal and that much of the surface topography dates from the Anglian. Copyright © 2014 British Geological Survey (NERC). Journal of Quaternary Science © 2014 John Wiley & Sons Ltd. |
format |
Article in Journal/Newspaper |
author |
FARRANT, ANDREW R. SMITH, CHRISTOPHER J. M. NOBLE, STEPHEN R. SIMMS, MICHAEL J. RICHARDS, DAVID A. |
spellingShingle |
FARRANT, ANDREW R. SMITH, CHRISTOPHER J. M. NOBLE, STEPHEN R. SIMMS, MICHAEL J. RICHARDS, DAVID A. Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK |
author_facet |
FARRANT, ANDREW R. SMITH, CHRISTOPHER J. M. NOBLE, STEPHEN R. SIMMS, MICHAEL J. RICHARDS, DAVID A. |
author_sort |
FARRANT, ANDREW R. |
title |
Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK |
title_short |
Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK |
title_full |
Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK |
title_fullStr |
Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK |
title_full_unstemmed |
Speleogenetic evidence from Ogof Draenen for a pre‐Devensian glaciation in the Brecon Beacons, South Wales, UK |
title_sort |
speleogenetic evidence from ogof draenen for a pre‐devensian glaciation in the brecon beacons, south wales, uk |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1002/jqs.2751 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2751 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2751 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Journal of Quaternary Science volume 29, issue 8, page 815-826 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.2751 |
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Journal of Quaternary Science |
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29 |
container_issue |
8 |
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815 |
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826 |
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1800753520560832512 |