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Retreat dynamics of the eastern sector of the British–Irish Ice Sheet during the last glaciation

Evans, David J. A. and Roberts, David H. and Bateman, Mark D. and Clark, Chris D. and Medialdea, Alicia and Callard, Louise and Grimoldi, Elena and Chiverrell, Richard C. and Ely, Jeremy and Dove, Dayton and Ó Cofaigh, Colm and Saher, Margot and Bradwell, Tom and Moreton, Steven G. and Fabel, Derek and Bradley, Sarah L. (2021) 'Retreat dynamics of the eastern sector of the British–Irish Ice Sheet during the last glaciation.', Journal of quaternary science., 36 (5). pp. 723-751.

Abstract

The findings of BRITICE‐CHRONO Transect 2 through the North Sea Basin and eastern England are reported. We define ice‐sheet marginal oscillation between ~31 and 16 ka, with seven distinctive former ice‐sheet limits (L1–7) constrained by Bayesian statistical analysis. The southernmost limit of the North Sea Lobe is recorded by the Bolders Bank Formation (L1; 25.8–24.6 ka). L2 represents ice‐sheet oscillation and early retreat to the northern edge of the Dogger Bank (23.5–22.2 ka), with the Garret Hill Moraine in north Norfolk recording a significant regional readvance to L3 at 21.5–20.8 ka. Ice‐marginal oscillations at ~26–21 ka resulted in L1, L2 and L3 being partially to totally overprinted. Ice‐dammed lakes related to L1–3, including Lake Humber, are dated at 24.1–22.3 ka. Ice‐sheet oscillation and retreat from L4 to L5 occurred between 19.7 and 17.3 ka, with grounding zone wedges marking an important transition from terrestrial to marine tidewater conditions, triggered by the opening of the Dogger Lake spillway between 19.9 and 17.5 ka. L6 relates to ice retreat under glacimarine conditions and final ice retreat into the Firth of Forth by 15.8 ka. L7 (~15 ka) represents an ice retreat from Bosies Bank into the Moray Firth.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/jqs.3275
Publisher statement:Copyright © 2021 The Authors Journal of Quaternary Science Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:11 January 2021
Date deposited:07 April 2021
Date of first online publication:10 March 2021
Date first made open access:07 April 2021

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