GLACIOMARINE DELTAIC DEPOSITION AND ICE-MARGINAL TECTONICS - THE LOCHDON SAND MORAINE, ISLE OF MULL, SCOTLAND

Detailed descriptions are given of sediments exposed in the 'Loch Don Sand Moraine', Isle of Mull, Scotland. Two distinct sediment-landform associations occur within the 'moraine': (i) a Gilbert-type glaciomari ne delta complex graded to ca. 34 m Ordnance Datum; and (ii) thrust mo raines consisting of deformed sands and silts. Whereas previous studie s have attributed the 'moraine' to a single glacial readvance, this pa per shows that the delta and the thrust moraines formed during ice-she et deglaciation and the Loch Lomond Readvance, respectively. Depositio nal conditions and the palaeoenvironment for each stage of 'moraine' f ormation are reconstructed. During the Loch Lomond Readvance, till dep osition and thrust moraine formation appear to have been controlled by drainage conditions in the marginal zone of the glacier.