part 2] THE SOUTH-WEST HIGHLANDS OF SCOTLAND. 109 



(3) Of the groups enumerated in explanation of A & B, the Cuil-Bay 

 Slates are unrepresented in any exposure of the Ballachulish Fold ; in the 

 same fold the Appin Phyllites and Limestone do not extend into Glen Coe, and 

 fail to reach more than about 2 miles east of the head of Loch Creran (1914, 

 pi. xlv) ; the Appin Quartzite continues to Glen Coe, about a mile east of 

 Ballachulish, and then stops ; while near the head of Loch Creran it is found 

 no farther east than the Appin Limestone ; the Ballachulish Slates are still 

 recognizable, some 10 feet thick, in Coire Mhorair, half-a-dozen miles east of 

 Ballachulish : they are, however, absent in the Windows of Etive, and near 

 the head of Loch Creran are little more persistent than the associated Appin 

 Quartzite, Limestone, and Phyllites. 



(4) Admittedly, the limitations just outlined are rendered a little indefinite, 

 owing to the part played by slides in the construction of the Appin and 

 Ballachulish Folds. At the same time, I hold (and I do not think that anyone 

 familiar with the evidence would disagree) that the Appin Quartzite and 



Fig. 5. — Diagrammatic section illustrating the geological 

 contrasts north-ivest and south-east of Dalmally. 



N.W. S.E. 



KINTYRE, 

 APPIN DALMALLY COWAL, * 



LOCff TAY 



Y 



I 



V Loch Awe. Group 



E, 



AS DA LB OlatES 



lsLf\Y QoAArz/T^ 





Ejloe fi 



LAGS 



Sub - £u D£ C OA7/»/. £ X 



[A & B=: Cores of the Appin and Ballachulish Folds constituted of Cuil-Bay 

 Slates, Appin Phyllites, Appin Limestone, Appin Quartzite, and Balla- 

 chulish Slates. 



L = Core of the Ben-Lui Fold, constituted of Ben-Lawers Schists, Ben-Lui 

 Schists, Loch-Tay Limestone, Pitlochry Schists, Green Beds, Ben-Ledi 

 Grits and Schists, Aberfoyle Slates, and Leny Grits.] 



Ballachulish Slates do not extend south-east of the Windows of Etive in 

 either the Appin or the Ballachulish Fold. 



(5) The Ballachulish Nappe can be recognized with considerable confidence 

 in the Dalmally district, where it has been interpreted as consisting of a 

 great mass of Leven Schists overlying a tolerably constant remnant of 

 Ballachulish Limestone. Mr. M. Macgregor and I have succeeded in tracing 

 its outcrop from the south-eastern corner of the Etive Granite, right round 

 the Glen-Orchy Anticline to Ben Doirean and beyond (1912 b, p. 172 & pi. x). 

 The limestone rests, through the intervention of the Ballachulish Thrust, 

 upon an attenuated representative of the Banded Series of the Leven Schists. 

 The Banded Series in its turn rests on Glen-Coe Quartzite, very thick in the 

 south and thin or absent in the north, and below this come Eilde Flags with 

 local exposures of the Sub- Eilde Complex at Ben Udlaidh and (presumably) 

 at Loch Dochard too. 



