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

Colin K. Ballantyne, Adrian M. Hall, William Phillips, Steven Binnie and Peter W. Kubik
Age and significance of former low-altitude corrie glaciers on Hoy, Orkney Islands
Scottish Journal of Geology (2007) 43, Part 2: 107-114

Abstract

Geomorphological mapping provides evidence for two former low-level corrie glaciers on Hoy, both defined by end moraines. Five (super 10) Be exposure ages obtained from sandstone boulders on moraine crests fall within the range 12.4+ or -1.5 ka to 10.4+ or -1.7 ka (weighted mean 11.7+ or -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 (< or =0.75 km (super 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.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 43, Part 2
Title: Age and significance of former low-altitude corrie glaciers on Hoy, Orkney Islands
Affiliation: University of Saint Andrews, School of Geography and Geosciences, Fife, United Kingdom
Pages: 107-114
Published: 2007
Text Language: English
Publisher: Scottish Academic Press, Edinburgh, United Kingdom
References: 55
Accession Number: 2008-032578
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N58°51'00" - N58°51'00", W03°17'60" - W03°17'60"
Secondary Affiliation: University of Idaho, USA, United StatesUniversity of Edinburgh, GBR, United KingdomPaul Scherrer Institute, CHE, Switzerland
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200810
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