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The Last Scottish Ice Sheet

Published online by Cambridge University Press:  15 May 2018

Colin K. BALLANTYNE  and
David SMALL
Colin K. BALLANTYNE
Affiliation:
School of Geography and Sustainable Development, University of St Andrews, St Andrews KY16 9AL, UK. Email: ckb@st-and.ac.uk
David SMALL
Affiliation:
Department of Geography, Durham University, Lower Mountjoy, South Road, Durham DH1 3LE, UK.
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Abstract

The last Scottish Ice Sheet (SIS) expanded from a pre-existing ice cap after ∼35 ka. Highland ice dominated, with subsequent build-up of a Southern Uplands ice mass. The Outer Hebrides, Skye, Mull, the Cairngorms and Shetland supported persistent independent ice centres. Expansion was accompanied by ice-divide migration and switching flow directions. Ice nourished in Scotland reached the Atlantic Shelf break in some sectors but only mid-shelf in others, was confluent with the Fennoscandian Ice Sheet (FIS) in the North Sea Basin, extended into northern England, and fed the Irish Sea Ice Stream and a lobe that reached East Anglia. The timing of maximum extent was diachronous, from ∼30–27 ka on the Atlantic Shelf to ∼22–21 ka in Yorkshire. The SIS buried all mountains, but experienced periods of thickening alternating with drawdown driven by ice streams such as the Minch, the Hebrides and the Moray Firth Ice Streams. Submarine moraine banks indicate oscillating retreat and progressive decoupling of Highland ice from Orkney–Shetland ice. The pattern and timing of separation of the SIS and FIS in the North Sea Basin remain uncertain. Available evidence suggests that by ∼17 ka, much of the Sea of the Hebrides, the Outer Hebrides, Caithness and the coasts of E Scotland were deglaciated. By ∼16 ka, the Solway lowlands, Orkney and Shetland were deglaciated, the SIS and Irish Ice Sheet had separated, the ice margin lay along the western seaboard, nunataks had emerged in Wester Ross, the ice margin lay N of the Cairngorms and the sea had invaded the Tay and Forth estuaries. By ∼15 ka, most of the Southern Uplands, the Firth of Clyde, the Midland Valley and the upper Spey valley were deglaciated, and in NW Scotland ice was retreating from fjords and valleys. By the onset of rapid warming at ∼14.7 ka, much of the remnant SIS was confined within the limits of Younger Dryas glaciation. The SIS, therefore, lost most of its mass during the Dimlington Stade. It is uncertain whether fragments of the SIS persisted on high ground throughout the Lateglacial Interstade.

Keywords

British–Irish Ice SheetdeglaciationDimlington Stadeflowsetsice streamsLate Devensianlithostratigraphyradiocarbon datingreadvancesterrestrial cosmogenic nuclide dating
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 110 , Issue 1-2: Advances in Scottish Quaternary Studies , March 2019 , pp. 93 - 131
Copyright
Copyright © The Royal Society of Edinburgh 2018 

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