The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles
The granite uplands of Dartmoor have traditionally been considered to be relict permafrost and periglacial landscapes that lay beyond the limits of Quaternary glaciations but a variety of landform evidence indicates that a plateau icefield existed on the northern part of the moor, constituting the s...
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Online Access: | https://www.zora.uzh.ch/id/eprint/136093/ https://www.zora.uzh.ch/id/eprint/136093/1/2012_Vieli_1-s2.0-S0277379112001667-main.pdf https://doi.org/10.5167/uzh-136093 https://doi.org/10.1016/j.quascirev.2012.04.019 |
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ftunivzuerich:oai:www.zora.uzh.ch:136093 2024-09-15T18:11:37+00:00 The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles Evans, David J A Harrison, Stephan Vieli, Andreas Anderson, Ed 2012 application/pdf https://www.zora.uzh.ch/id/eprint/136093/ https://www.zora.uzh.ch/id/eprint/136093/1/2012_Vieli_1-s2.0-S0277379112001667-main.pdf https://doi.org/10.5167/uzh-136093 https://doi.org/10.1016/j.quascirev.2012.04.019 eng eng Elsevier https://www.zora.uzh.ch/id/eprint/136093/1/2012_Vieli_1-s2.0-S0277379112001667-main.pdf doi:10.5167/uzh-136093 doi:10.1016/j.quascirev.2012.04.019 urn:issn:0277-3791 info:eu-repo/semantics/restrictedAccess Evans, David J A; Harrison, Stephan; Vieli, Andreas; Anderson, Ed (2012). The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles. Quaternary Science Reviews, 45:31-53. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftunivzuerich https://doi.org/10.5167/uzh-13609310.1016/j.quascirev.2012.04.019 2024-08-21T00:19:56Z The granite uplands of Dartmoor have traditionally been considered to be relict permafrost and periglacial landscapes that lay beyond the limits of Quaternary glaciations but a variety of landform evidence indicates that a plateau icefield existed on the northern part of the moor, constituting the southernmost independent ice cap in the British Isles. Overdeepened or weakly U-shaped valley segments fringing north Dartmoor document an early, extensive phase of glaciation but the most convincing landform evidence relates to more recent, valley-based glacier occupancy. A moraine ridge on the Slipper Stones represents the most unequivocal palaeo-glacier on north Dartmoor with a palaeo-ELA of c.460 m above sea level (asl), although this relates to the youngest and most restricted phase of glaciation. A longer term ELA is likely to be represented by the Corn Ridge proto-cirque at 370–410 m asl. More extensive valley glaciers are recorded in each of the major drainage basins of north Dartmoor by arcuate and linear bouldery ridges and hummocky valley floor drift, which are interpreted as latero-frontal moraines deposited by outlet lobes of a plateau icefield. Recession of these lobes is marked by inset sequences of such ridges and occasional meltwater channels. Plateau ice was predominantly thin and protective, and snowblow and preferential accumulation in valley heads facilitated the modest glacial erosion and debris transport recorded in the landforms and sediments. It is proposed that the highest plateaux have been occupied by ice for the longest cumulative period of time throughout the Quaternary (“average glacial conditions”), explaining the distribution of different tor types on northern Dartmoor. This also explains the lack of tors on the most expansive of the highest plateau terrain (ice dispersal centres) as the product of: a) average glacial conditions preferentially removing tors or dampening their production rates; b) the survival of high relief (Type 1) tors during glaciation if they occupy summits too ... Article in Journal/Newspaper Ice Ice cap permafrost University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Evans, David J A Harrison, Stephan Vieli, Andreas Anderson, Ed The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles |
topic_facet |
Institute of Geography 910 Geography & travel |
description |
The granite uplands of Dartmoor have traditionally been considered to be relict permafrost and periglacial landscapes that lay beyond the limits of Quaternary glaciations but a variety of landform evidence indicates that a plateau icefield existed on the northern part of the moor, constituting the southernmost independent ice cap in the British Isles. Overdeepened or weakly U-shaped valley segments fringing north Dartmoor document an early, extensive phase of glaciation but the most convincing landform evidence relates to more recent, valley-based glacier occupancy. A moraine ridge on the Slipper Stones represents the most unequivocal palaeo-glacier on north Dartmoor with a palaeo-ELA of c.460 m above sea level (asl), although this relates to the youngest and most restricted phase of glaciation. A longer term ELA is likely to be represented by the Corn Ridge proto-cirque at 370–410 m asl. More extensive valley glaciers are recorded in each of the major drainage basins of north Dartmoor by arcuate and linear bouldery ridges and hummocky valley floor drift, which are interpreted as latero-frontal moraines deposited by outlet lobes of a plateau icefield. Recession of these lobes is marked by inset sequences of such ridges and occasional meltwater channels. Plateau ice was predominantly thin and protective, and snowblow and preferential accumulation in valley heads facilitated the modest glacial erosion and debris transport recorded in the landforms and sediments. It is proposed that the highest plateaux have been occupied by ice for the longest cumulative period of time throughout the Quaternary (“average glacial conditions”), explaining the distribution of different tor types on northern Dartmoor. This also explains the lack of tors on the most expansive of the highest plateau terrain (ice dispersal centres) as the product of: a) average glacial conditions preferentially removing tors or dampening their production rates; b) the survival of high relief (Type 1) tors during glaciation if they occupy summits too ... |
format |
Article in Journal/Newspaper |
author |
Evans, David J A Harrison, Stephan Vieli, Andreas Anderson, Ed |
author_facet |
Evans, David J A Harrison, Stephan Vieli, Andreas Anderson, Ed |
author_sort |
Evans, David J A |
title |
The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles |
title_short |
The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles |
title_full |
The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles |
title_fullStr |
The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles |
title_full_unstemmed |
The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles |
title_sort |
glaciation of dartmoor: the southernmost independent pleistocene ice cap in the british isles |
publisher |
Elsevier |
publishDate |
2012 |
url |
https://www.zora.uzh.ch/id/eprint/136093/ https://www.zora.uzh.ch/id/eprint/136093/1/2012_Vieli_1-s2.0-S0277379112001667-main.pdf https://doi.org/10.5167/uzh-136093 https://doi.org/10.1016/j.quascirev.2012.04.019 |
genre |
Ice Ice cap permafrost |
genre_facet |
Ice Ice cap permafrost |
op_source |
Evans, David J A; Harrison, Stephan; Vieli, Andreas; Anderson, Ed (2012). The glaciation of Dartmoor: the southernmost independent Pleistocene ice cap in the British Isles. Quaternary Science Reviews, 45:31-53. |
op_relation |
https://www.zora.uzh.ch/id/eprint/136093/1/2012_Vieli_1-s2.0-S0277379112001667-main.pdf doi:10.5167/uzh-136093 doi:10.1016/j.quascirev.2012.04.019 urn:issn:0277-3791 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5167/uzh-13609310.1016/j.quascirev.2012.04.019 |
_version_ |
1810449206329999360 |