The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields
Abstract If glacial till contains more than a certain minimum boulder content, it is dilatant and requires a much larger stress to initiate shear deformation than to sustain it. If the stress level at the glacier–terrain interface drops below a certain critical level, or the till reaches its critica...
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Language: | English |
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Cambridge University Press (CUP)
1968
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Online Access: | http://dx.doi.org/10.1017/s0022143000020591 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000020591 |
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crcambridgeupr:10.1017/s0022143000020591 2024-10-13T14:08:40+00:00 The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields Smalley, Ian J. Unwin, David J. 1968 http://dx.doi.org/10.1017/s0022143000020591 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000020591 en eng Cambridge University Press (CUP) Journal of Glaciology volume 7, issue 51, page 377-390 ISSN 0022-1430 1727-5652 journal-article 1968 crcambridgeupr https://doi.org/10.1017/s0022143000020591 2024-09-18T04:03:45Z Abstract If glacial till contains more than a certain minimum boulder content, it is dilatant and requires a much larger stress to initiate shear deformation than to sustain it. If the stress level at the glacier–terrain interface drops below a certain critical level, or the till reaches its critical boulder-content density, then the till beneath the glacier packs into stable obstructions. These are shaped into streamlined forms by the glacier and are found distributed at random in drumlin fields. Due to drumlin coalescence there is a normal distribution of drumlin axes about the direction of ice movement. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 7 51 377 390 |
institution |
Open Polar |
collection |
Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract If glacial till contains more than a certain minimum boulder content, it is dilatant and requires a much larger stress to initiate shear deformation than to sustain it. If the stress level at the glacier–terrain interface drops below a certain critical level, or the till reaches its critical boulder-content density, then the till beneath the glacier packs into stable obstructions. These are shaped into streamlined forms by the glacier and are found distributed at random in drumlin fields. Due to drumlin coalescence there is a normal distribution of drumlin axes about the direction of ice movement. |
format |
Article in Journal/Newspaper |
author |
Smalley, Ian J. Unwin, David J. |
spellingShingle |
Smalley, Ian J. Unwin, David J. The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields |
author_facet |
Smalley, Ian J. Unwin, David J. |
author_sort |
Smalley, Ian J. |
title |
The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields |
title_short |
The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields |
title_full |
The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields |
title_fullStr |
The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields |
title_full_unstemmed |
The Formation and Shape of Drumlins and their Distribution and Orientation in Drumlin Fields |
title_sort |
formation and shape of drumlins and their distribution and orientation in drumlin fields |
publisher |
Cambridge University Press (CUP) |
publishDate |
1968 |
url |
http://dx.doi.org/10.1017/s0022143000020591 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000020591 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 7, issue 51, page 377-390 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000020591 |
container_title |
Journal of Glaciology |
container_volume |
7 |
container_issue |
51 |
container_start_page |
377 |
op_container_end_page |
390 |
_version_ |
1812815384659623936 |