The Glen Orchy Anticline (Argyllshire)

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Abstract
I. Introduction. In a previous paper [1, p. 586] an explanation has been offered of the tectonics of the schists occupying a district of the West Highlands between Loch Tulla and Appin, in the south, and the River Spean, beyond Ben Nevis, in the north (fig. 1). In the present paper the south-eastern continuation of this district is dealt with, from the head of Loch Awe to Beinn Achallader, one of the summits of the Beinn Doirean range (Pl. X). In the district originally described lying to the west and north of Loch Tulla the following stratigraphical sequence was established; but, whether it should be read upwards or downwards, is still unascertained:— 9. Eilde Flags. 8. Glen Coe Quartzite (fine-grained). 7. Leven Schists (grey phyllites, with ‘Banded Series’ next the Glen Coe Quartzite). 6. Ballachulish Limestone (dark grey, with a thick cream-coloured margin next the Leven Schists). 5. Ballachulish Slates (black). 4. Appin Quartzite (pebbly). 3. Appin Limestone (cream, pink, or very pale blue). 2. Appin Phyllites (with a large proportion of flaggy quartzite). 1. Cuil Bay Slates (black). These rock-groups, as previously shown, are disposed in two major recumbent folds, known as the Ballachulish and Appin Folds respectively, to which may be added the subordinate Aonach Beag Fold, recognized as yet in the neighbourhood of Ben Nevis only. For convenience of description, the cores of these three folds have been arbitrarily defined as those portions which are made up of rocks included in Groups 1-6 of the foregoing stratigraphical table.

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