III.—Perthshire Tectonics: Schiehallion to Glen Lyon

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Abstract
Our district (Pl. II) includes an exceptionally beautiful tract of the Highlands, stretching from the Errochty Water, half a dozen miles north-east of Kinloch Rannoch, to near Loch Tay. It reaches its greatest height in Beinn a' Chuallaich (2925 ft.), Schiehallion (3547 ft.), Carn Mairg (3419 ft.), and Carn Gorm (CG, Pl. II, 3370 ft.). These, with companion mountains that closely approach the 3000-foot contour, are remnants of the much dissected Highland plateau. There are two main eastwardly-draining valley systems: the more northerly holds Loch Rannoch and the River Tummel; the more southerly is known throughout its length as Glen Lyon. The southern limit of the district approximately follows the divide between Glen Lyon and Loch Tay, but fails to include the summit of Ben Lawers (3984 ft.) (inset, text-fig. 14). The eastern margin is really marked by the great Loch Tay fault; though, for purposes of comparison, some previously published mapping is reproduced on PL II east of this fault. The Tummel and the Lyon cross the Loch Tay fault at about 450 and 400 ft. above sea-level.

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