Radiocarbon ages for a glaciomarine bed associated with the maximum of the Loch Lomond Readvance in west Benderloch, Argyll

Peacock, J. D.; Harkness, D. D.; Housley, R. A.; Little, Joe; Paul, Michael A.

doi:10.1144/sjg25010069

Cited by 20 publications

(31 citation statements)

References 18 publications

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“…These morphostratigraphic relationships have been observed elsewhere in the Scottish Highlands (e.g. Sissons, 1974) and have been suggested to indicate a two-phased Younger Dryas advance (see also Peacock et al, 1989;Merritt et al, 2003), whereby the outlet glaciers are suggested to have only briefly remained at their maximum positions, prior to slight retreat and stabilisation for longer further upvalley. Such a hypothesis of two-phase Younger Dryas glaciation may be tested in future as higher-resolution numerical dating methods are refined or become available.…”

Section: Timing Of Maximum Glaciationsupporting

confidence: 62%

A Younger Dryas plateau icefield in the Monadhliath, Scotland, and implications for regional palaeoclimate

Boston

Lukas

Carr

2015

Quaternary Science Reviews

136

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a b s t r a c tA record of Younger Dryas glaciation in Scotland is well established. However, the role of the Monadhliath, a significant plateau area extending over 840 km 2 in central Scotland, has never been investigated systematically. We present the first systematic glacial geomorphological mapping across the whole region, which has led to the identification of hitherto-unrecorded glacial and associated landforms. The spatial distribution of these landforms indicates that the last phase of glaciation in the area was that of a local plateau icefield. In addition, a clear morphostratigraphical signature provides a strong indication that the icefield dates to the Younger Dryas (12.9e11.7 ka), which is supported by numerical ages in the southeast of the study area. Based on the geomorphological evidence and 2D glacier surface profile modelling, a 280 km 2 icefield is reconstructed. A novel approach is introduced to quantify plateau icefield thickness for equilibrium line altitude (ELA) and palaeoprecipitation calculations, resulting in greater overall data confidence compared to traditional reconstruction methods. The ELA for the whole icefield is calculated to be 714 ± 25 m, whilst the ELAs of individual outlet glaciers range from 560 m in the west to 816 m in the east, demonstrating a significant WeE precipitation gradient across the region during the Younger Dryas. These ELAs compare well with those calculated for Younger Dryas ice masses reconstructed in neighbouring regions and are in good agreement with overall precipitation patterns suggested for Scotland during this time. Whilst the total amount of precipitation calculated from these ELAs is highly dependent on the method used, irrespective of this, the study suggests a more arid Younger Dryas climate in the region compared to the present day.

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Section: Timing Of Maximum Glaciationsupporting

confidence: 62%

A Younger Dryas plateau icefield in the Monadhliath, Scotland, and implications for regional palaeoclimate

Boston

Lukas

Carr

2015

Quaternary Science Reviews

136

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“…At only a few sites has radiocarbon dating of the readvance proved feasible (e.g. Rose et al, 1988;Peacock et al, 1989). Comparison of the lithostratigraphy, pollen stratigraphy and/ or tephrostratigraphy of kettle hole and lake sites inside and outside the glacier limits has proved decisive in determining an LLS age for the readvance at some sites (e.g.…”

Section: The Loch Lomond Readvancementioning

confidence: 99%

Extent and deglacial chronology of the last British–Irish Ice Sheet: implications of exposure dating using cosmogenic isotopes

Ballantyne

2009

J Quaternary Science

142

128

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Ballantyne, C. K. 2010. Extent and deglacial chronology of the last British-Irish Ice Sheet: implications of exposure dating using cosmogenic isotopes.ABSTRACT: Over 160 10 Be and 36 Cl exposure ages pertaining to the extent and chronology of the last British-Irish Ice Sheet (BIIS) are critically reviewed. Despite uncertainties inherent in the use of exposure ages, this approach has demonstrated that at the Last Glacial Maximum (LGM; ca. 26-21 ka) the BIIS extended over all low ground in Scotland and all (or almost all) of Ireland, consistent with recent models depicting extension of the last BIIS to the Atlantic shelf edge. All exposure ages obtained for high-level sites above trimlines on the mountains of northwestern Scotland and Ireland pre-date the LGM. This finding confirms that high plateaux in these areas escaped significant glacial erosion, probably under a protective cover of cold-based glacier ice that remained frozen to the underlying substrate. In terms of deglaciation chronology, the southern Irish Sea basin was probably deglaciated by 19-18 ka, with extensive deglaciation of low ground in Ireland and northeastern Scotland prior to ca. 14.5 ka. Ice cover on low ground in northwestern Scotland apparently persisted after 14.0 ka, suggesting survival of ice in favourable locations during the Lateglacial Interstade (ca. 14.5-12.9 ka). Attempts to date readvances have had mixed success. The Wester Ross Readvance in northwestern Scotland was initially dated to ca. 16.3 ka, but more recent research implies a much younger age (ca. 14.0-13.5 ka). Exposure ages indicating a prolonged stillstand during ice sheet retreat in the Cairngorms at ca. 14.5-14.0 ka conflict with ages obtained on postglacial rockslides and basal radiocarbon dates, which indicate deglaciation before ca. 15.5-15.0 ka. Exposure dating has been successfully employed to confirm a Loch Lomond Stadial (ca. 12.9-11.5 ka) age for moraines in several mountain areas, and to constrain the minimum altitude of the ice cap that extended over the Western Grampians at that time.

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“…Although the Loch Lomond Stade was terminated by rapid climate warming at ca. 11.5 cal kyr BP (Atkinson et al, 1987;Alley et al, 1993), there is evidence that glacier tongues had begun to retreat several centuries before the stadial termination, probably due to a reduction in snowfall (Rose et al, 1988;Peacock et al, 1989;Benn et al, 1992;Ballantyne and Harris, 1994). The final retreat of glacier ice in the upper Edendon Valley therefore may have occurred well before the end of the stade.…”

Section: Synthesis: Landscape Change In the Upper Edendon Valleymentioning

confidence: 99%

Late Holocene floodplain incision and alluvial fan formation in the central Grampian Highlands, Scotland: chronology, environment and implications

Ballantyne

Whittington

1999

J. Quaternary Sci.

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Radiocarbon ages for a glaciomarine bed associated with the maximum of the Loch Lomond Readvance in west Benderloch, Argyll

Cited by 20 publications

References 18 publications

A Younger Dryas plateau icefield in the Monadhliath, Scotland, and implications for regional palaeoclimate

A Younger Dryas plateau icefield in the Monadhliath, Scotland, and implications for regional palaeoclimate

Extent and deglacial chronology of the last British–Irish Ice Sheet: implications of exposure dating using cosmogenic isotopes

Late Holocene floodplain incision and alluvial fan formation in the central Grampian Highlands, Scotland: chronology, environment and implications

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