82 ME. E, B. BAILEY ON THE STEUCTUEE OF [vol. Ixxviii, 



2. The Steuctuee of the South-West Hi&hlands o/" Scotla]S"d. 

 By Edwaed Batteesbt Bailey, M.C, B.A., F.E.S.E., 

 F.G.S. (Read March 23rd, 1921.) 



[Plate I — Geological Map.] 



Contents. 



Page 



I. Introduction 82 



Statement of the Problem. 



Clough's Secret of the Highlands. 



Slides recognized. 



Nappes and their Travels. 



Direction of Movement defined and discussed. 



Metamorphism. 



Corrigenda since 1910. 



(1910) Recumbent Folds in the Schists of the Scottish 

 Highlands. 



(1912) The Glen-Orchy Anticline (E. B. BaHey & M. Mac- 



gregor). 



(1913) The Loch- Awe Syncline. 



(1914) The Ballachulish Fold near the Head of Loch 



Creran. 

 (1917 for 1916) The Islay Anticline. 



n. The Three Great Structural Divisions 95 



The Loch- Awe Nappe. 



The Iltay Nappe. 



The Ballappel Foundation. 



Suggested Stratigraphical Correlations. 



III. Critical Discussion of the District reaching from Ard- 



mucknish to Ben Lui 108 



Appin and Ballachulish Folds. 



Contact of the Ballappel Foundation and the Iltay Nappe 

 at Loch Creran. 

 The Ballappel Foundation, north-west of the Thrust. 

 The Thrust. 



Iltay Nappe, south-east of the Thrust. 

 Outcrop of the Iltay Nappe north of the Loch- Awe Nappe. 

 Ballappel Foundation and Iltay Nappe, north-west of the 



Loch-Awe Nappe. 

 Loch- Awe Nappe. 



Ballappel Foundation and Iltay Nappe, north-east of the 

 Loch- Awe Nappe. 

 Ben-Lui Fold and the Thrust at the Base of the Loch- Awe 

 Nappe. 



IV. Conclusion 125 



Appendix I — Bibliography 125 



Appendix II — Locality-Index 127 



I. I]S'TEODUCTIO^^. 



The gradual development of structural interpretation in regard to 

 the South- West Highlands of Scotland has much in common with 

 the long-continued building of some great cathedi-al. The workers 

 have been many, each with his own individualitj^, and each in- 

 iiuenced by the spirit of his time. In these circumstances, 



