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

C. K. Ballantyne, A. M. Hall, W. M. Phillips, S. Binnie, P.W. Kubik

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)107-114
    Number of pages8
    JournalScottish Journal of Geology
    Volume43
    Issue number2
    DOIs
    Publication statusPublished - 2007

    Keywords

    • LOCH-LOMOND READVANCE
    • NORTHERN NORTH-SEA
    • PALEOCLIMATIC IMPLICATIONS
    • YOUNGER DRYAS
    • ICE-SHEET
    • QUATERNARY GLACIATIONS
    • COSMOGENIC NUCLIDES
    • SCOTLAND
    • RECONSTRUCTION
    • RATES

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