Abstract
The present paper may be said to deal in particular with Ben Lawers and Meall Corranaich, and in general with the whole of the Ben-Lawers range lying between the Bridge-of-Balgie Fault on the east, and the Loch-Tay Fault on the west; for, while the structures seen on those two mountains are undoubtedly typical, certain features there observed only attain their full significance when viewed in the light of what is seen elsewhere on the range. The area is one of considerable relief, the range reaching its highest elevation in Ben Lawers (3984 feet), and having many summits above the 3000-foot level: it is deeply dissected by several glens, such as Glen Lochay, the Pass over to Glen Lyon west of Beinn Ghlas (Lochan-na-Larig Pass), and those occupied by the Allt Tuim Bhric (Carie Burn), and the Lawers Burn, on the south side; while on the north side of the range there are the Gleann Allt Da Eig and the Gleann Allt Chobhair. The district was first surveyed by J. S. Grant Wilson, and his results, published on the 1-inch maps of the Geological Survey of Scotland (Sheets 46 & 47), afford much food for thought to later workers, who must always be grateful to these pioneers in mapping. No official description has, however, appeared, although we have been told by M. Macgregor that ‘it has long attracted the attention of geologists from its apparently obvious synclinal structure and from the possibility of its furnishing a clue to the structure of

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