Extent of the last ice sheet in northern Scotland tested with cosmogenic 10Be exposure ages |
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| Authors: | William M Phillips Adrian M Hall Colin K Ballantyne Steven Binnie Peter W Kubik Stewart Freeman |
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| Institution: | 1. Idaho Geological Survey, University of Idaho, Moscow, Idaho, USA;2. Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh, UK;3. School of Geography and Geosciences, University of St Andrews, Fife, UK;4. Paul Scherrer Institute, c/o Institute of Particle Physics, ETH H?nggerberg, Zurich, Switzerland;5. SUERC, Scottish Enterprise Technology Park, Glasgow, UK |
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| Abstract: | The extent of the last British–Irish Ice Sheet (BIIS) in northern Scotland is disputed. A restricted ice sheet model holds that at the global Last Glacial Maximum (LGM; ca. 23–19 ka) the BIIS terminated on land in northern Scotland, leaving Buchan, Caithness and the Orkney Islands ice‐free. An alternative model implies that these three areas were ice‐covered at the LGM, with the BIIS extending offshore onto the adjacent shelves. We test the two models using cosmogenic 10Be surface exposure dating of erratic boulders and glacially eroded bedrock from the three areas. Our results indicate that the last BIIS covered all of northern Scotland during the LGM, but that widespread deglaciation of Caithness and Orkney occurred prior to rapid warming at ca. 14.5 ka. Copyright © 2008 John Wiley & Sons, Ltd. |
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| Keywords: | Scotland last ice sheet 10Be exposure dating deglaciation chronology |
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