The nature and age of the debris accumulation at Gribun, Western Mull, Inner Hebrides

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Abstract
Synopsis: In the Gribun area of western Mull, Scottish Inner Hebrides, a large debris accumulation is interpreted as a morainic complex. Although the outermost moraine ridge is located well beyond the limits of the Loch Lomond (Younger Dryas) glaciation previously proposed for the island, lithostratigraphic and biostratigraphic evidence from a deep basin enclosed within the moraine suggest that the feature formed during the Loch Lomond Stadial. At that time the regional firn line altitude in western Mull may have been as low as c. 100 m. The pollen stratigraphy of the basin sediments indicates that the site was ice free before the close of the Loch Lomond Stadial, sensu stricto, reflecting the low altitude of the glacier and its relatively small size. Evidence from Gribun supports the view that deglaciation in parts of Highland Britain may have been underway as early as 10,600 B.P.