Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland
A 3700-km2 area adjacent to the Firth of Clyde, Scotland, is examined to constrain the development and dynamics of the western central sector of the last British and Irish Ice Sheet. Results from geomorphological mapping, lithostratigraphic investigations, three-dimensional geological modelling and...
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ftnerc:oai:nora.nerc.ac.uk:9793 2023-05-15T16:39:51+02:00 Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland Finlayson, Andrew Merritt, Jon Browne, Mike Merritt, Jo McMillan, Andrew Whitbread, Katie 2010 text http://nora.nerc.ac.uk/id/eprint/9793/ https://nora.nerc.ac.uk/id/eprint/9793/1/Finlayson_et_al_2010_original.pdf http://www.sciencedirect.com/science/journal/02773791 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/9793/1/Finlayson_et_al_2010_original.pdf Finlayson, Andrew; Merritt, Jon; Browne, Mike; Merritt, Jo; McMillan, Andrew; Whitbread, Katie. 2010 Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland. Quaternary Science Reviews, 29 (7-8). 969-988. https://doi.org/10.1016/j.quascirev.2009.12.016 <https://doi.org/10.1016/j.quascirev.2009.12.016> Earth Sciences Publication - Article PeerReviewed 2010 ftnerc https://doi.org/10.1016/j.quascirev.2009.12.016 2023-02-04T19:26:18Z A 3700-km2 area adjacent to the Firth of Clyde, Scotland, is examined to constrain the development and dynamics of the western central sector of the last British and Irish Ice Sheet. Results from geomorphological mapping, lithostratigraphic investigations, three-dimensional geological modelling and field observations are combined to produce an empirically constrained, five-stage conceptual model of ice sheet evolution. (A) Previously published dates on interstadial organic deposits and mammalian fossils suggest that the Main Late Devensian (MLD) (MIS 2) glaciation of central Scotland began after 35 ka cal BP. During build-up, ice advanced from the western Scottish Highlands into the Clyde and Ayrshire basins. Glaciomarine muds and shelly deposits scavenged from the Firth of Clyde were redeposited widely as shelly tills and glacial rafts. Ice advance against reverse slopes generated, and subsequently overtopped, ice-marginal sediment accumulations. We hypothesise that some of these formed pre-cursor ridges which were moulded into suites of ribbed moraine during the glacial cycle. (B) Sustained stadial conditions at the Last Glacial Maximum (LGM) (c 30–25 ka cal BP) resulted in development of a major dispersal centre over the Firth of Clyde and Southern Uplands. This dispersal centre locally preserved previously formed subglacial bedforms, and fed a wide corridor of fast-flowing ice east towards the Firth of Forth. (C) Initial deglaciation promoted a substantial re-configuration of the ice surface, with enhanced westward drawdown into the outer Firth of Clyde and eastward migration of an ice divide towards the Clyde-Forth watershed. (D) Renewed ice sheet thickening over the Firth of Clyde may have accompanied growth of the Irish Ice Sheet during the Killard Point Stadial (c 17.1–15.2 ka cal BP); it was associated with limited bed modification. Subsequent ice sheet retreat was characterised by substantial meltwater production, ponding and erosion. (E) Late stages of MLD ice sheet retreat were punctuated by one or ... Article in Journal/Newspaper Ice Sheet Natural Environment Research Council: NERC Open Research Archive Quaternary Science Reviews 29 7-8 969 988 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Finlayson, Andrew Merritt, Jon Browne, Mike Merritt, Jo McMillan, Andrew Whitbread, Katie Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland |
topic_facet |
Earth Sciences |
description |
A 3700-km2 area adjacent to the Firth of Clyde, Scotland, is examined to constrain the development and dynamics of the western central sector of the last British and Irish Ice Sheet. Results from geomorphological mapping, lithostratigraphic investigations, three-dimensional geological modelling and field observations are combined to produce an empirically constrained, five-stage conceptual model of ice sheet evolution. (A) Previously published dates on interstadial organic deposits and mammalian fossils suggest that the Main Late Devensian (MLD) (MIS 2) glaciation of central Scotland began after 35 ka cal BP. During build-up, ice advanced from the western Scottish Highlands into the Clyde and Ayrshire basins. Glaciomarine muds and shelly deposits scavenged from the Firth of Clyde were redeposited widely as shelly tills and glacial rafts. Ice advance against reverse slopes generated, and subsequently overtopped, ice-marginal sediment accumulations. We hypothesise that some of these formed pre-cursor ridges which were moulded into suites of ribbed moraine during the glacial cycle. (B) Sustained stadial conditions at the Last Glacial Maximum (LGM) (c 30–25 ka cal BP) resulted in development of a major dispersal centre over the Firth of Clyde and Southern Uplands. This dispersal centre locally preserved previously formed subglacial bedforms, and fed a wide corridor of fast-flowing ice east towards the Firth of Forth. (C) Initial deglaciation promoted a substantial re-configuration of the ice surface, with enhanced westward drawdown into the outer Firth of Clyde and eastward migration of an ice divide towards the Clyde-Forth watershed. (D) Renewed ice sheet thickening over the Firth of Clyde may have accompanied growth of the Irish Ice Sheet during the Killard Point Stadial (c 17.1–15.2 ka cal BP); it was associated with limited bed modification. Subsequent ice sheet retreat was characterised by substantial meltwater production, ponding and erosion. (E) Late stages of MLD ice sheet retreat were punctuated by one or ... |
format |
Article in Journal/Newspaper |
author |
Finlayson, Andrew Merritt, Jon Browne, Mike Merritt, Jo McMillan, Andrew Whitbread, Katie |
author_facet |
Finlayson, Andrew Merritt, Jon Browne, Mike Merritt, Jo McMillan, Andrew Whitbread, Katie |
author_sort |
Finlayson, Andrew |
title |
Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland |
title_short |
Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland |
title_full |
Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland |
title_fullStr |
Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland |
title_full_unstemmed |
Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland |
title_sort |
ice sheet advance, dynamics, and decay configurations : evidence from west central scotland |
publisher |
Elsevier |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/9793/ https://nora.nerc.ac.uk/id/eprint/9793/1/Finlayson_et_al_2010_original.pdf http://www.sciencedirect.com/science/journal/02773791 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/9793/1/Finlayson_et_al_2010_original.pdf Finlayson, Andrew; Merritt, Jon; Browne, Mike; Merritt, Jo; McMillan, Andrew; Whitbread, Katie. 2010 Ice sheet advance, dynamics, and decay configurations : evidence from West Central Scotland. Quaternary Science Reviews, 29 (7-8). 969-988. https://doi.org/10.1016/j.quascirev.2009.12.016 <https://doi.org/10.1016/j.quascirev.2009.12.016> |
op_doi |
https://doi.org/10.1016/j.quascirev.2009.12.016 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
7-8 |
container_start_page |
969 |
op_container_end_page |
988 |
_version_ |
1766030186800742400 |