Age and significance of former low-altitude corrie glaciers on Hoy, Orkney Islands

Geomorphological mapping provides evidence for two former low-level corrie glaciers on Hoy, both defined by end moraines. Five Be-10 exposure ages obtained from sandstone boulders on moraine crests fall within the range 12.4 +/- 1.5 ka to 10.4 +/- 1.7 ka (weighted mean 11.7 +/- 0.6 ka), confirming t...

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Bibliographic Details
Published in:Scottish Journal of Geology
Main Authors: Ballantyne, C. K., Hall, A. M., Phillips, W. M., Binnie, S., Kubik, P.W.
Format: Article in Journal/Newspaper
Language:English
Published: 2007
Subjects:
LOCH-LOMOND READVANCE
NORTHERN NORTH-SEA
PALEOCLIMATIC IMPLICATIONS
YOUNGER DRYAS
ICE-SHEET
QUATERNARY GLACIATIONS
COSMOGENIC NUCLIDES
SCOTLAND
RECONSTRUCTION
RATES
Ela
Loch Lomond
Ice Sheet
Online Access:https://research-portal.st-andrews.ac.uk/en/researchoutput/age-and-significance-of-former-lowaltitude-corrie-glaciers-on-hoy-orkney-islands(61369042-a61f-432f-9d23-55f49d15881d).html
https://doi.org/10.1144/sjg43020107
http://www.scopus.com/inward/record.url?scp=36249021088&partnerID=8YFLogxK
http://www.landforms.eu/orkney/Library/Ballantyne%20Hoy%20Paper%20Proof.pdf
Description
Summary:Geomorphological mapping provides evidence for two former low-level corrie glaciers on Hoy, both defined by end moraines. Five Be-10 exposure ages obtained from sandstone boulders on moraine crests fall within the range 12.4 +/- 1.5 ka to 10.4 +/- 1.7 ka (weighted mean 11.7 +/- 0.6 ka), confirming that these glaciers developed during the Loch Lomond (Younger Dryas) Stade (LLS) of 12.9-11.5 cal. ka BP, and demonstrate the feasibility of using this approach to establish the age of LLS glacier limits. The equilibrium line altitude (ELA) of one of the glaciers (99 m) is the lowest recorded for any LLS glacier, and the area-weighted mean ELA for both (141 m) is consistent with a general northward ELA decrease along the west coast of Britain. The size of moraines fronting these small (<= 0.75 km(2)) glaciers implies that glacier termini remained at or close to their limits for a prolonged period. The apparent restriction of LLS glaciers to only two sites on Hoy probably reflects topographic favourability, and particularly the extent of snow-contributing areas.

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