part 2] THE SOUTH-WEST HIGHLANDS OF SCOTLAND. 95 



expressing any opinion as to their stratigraphical equivalents. I am very sorry 

 that Mr. Carruthers's important contribution is not yet fully published. If it 

 were, I am certain that it would be easy to criticize some of his statements — 

 to judge from a preliminary notice (1913 a, p. 51) ; but of its value as a whole 

 there can be no question. 



It may be well to add that there was always an essential difference of 

 status in regard to the 1910 interpretation of the folded district of Kinloch- 

 leven (now admittedly wrong in important particulars), and that of (say) 

 Ballachulish. The former was based on what seemed a mere sufficiency of 

 evidence ; the latter upon the reiterated testimony of section after section. 

 In the Kinlochleven district I am now of opinion that I made one cardinal 

 mistake — I interpreted a syncline with steeply -inverted pitch as an anticline, 

 — and the realization of this has left an insufficient foundation for a complete 

 structural interpretation. No similar isolated accident could affect the 

 reading of the Ballachulish Fold and Slide. 



As regards other corrections of the work covered by my 1910 paper I may 

 refer to : — 



(1) The elucidation of additional details concerning the Ballachulish 



Fold near the head of Loch Creran (see 1914 paper). 



(2) The much more important recognition of the extension of the Iltay 



Nappe to the shores of Loch Creran, where previously I had, with 

 very imperfect knowledge of the ground, imagined that nothing but 

 a local facies of part of the Leven Schists occurred. This point is 

 dealt with in detail later on (p. 115). 



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

 gregor). — There is no correction to emphasize with regard to this paper. In 

 order to avoid criticism, the quartzites, mica-schists, and hmestone of the 

 Beinn-Udlaidh and Loch-Dochard exposures are ascribed in the sequel to the 

 Sub-Eilde Complex without definite stratigraphical correlation. 



1913. The Loch-Awe Syncline. — I no longer regard the St. Catherine's 

 Graphite -Schist and its immediately associated phyllites, or mica-schists, as 

 in stratigraphical continuity with the Ardrishaig Phyllites (1913&, p. 299). 

 This involves, among other things, the separation from the Ardrishaig 

 Phyllites of certain calcareous mica-schists, which are shown (1913 b, pi. xxxii) 

 as extending northwards and eastwards from Meall nan Tighearn (around 

 Ben Lui). The Erins Quartzite I still believe to be connected stratigraphi- 

 cally with the Ardrishaig Phyllites (p. 96). 



1914. The Ballachulish Fold near the Head of Loch Creran. — 

 This paper supplies certain corrections to its predecessor of 1910. 



1917 (for 1916). The Islay Anticline. — Nothing further has been 

 published. 



II. The Three Great STRrcTURAL Diyisions. 



A concise treatment will now be given of the stratigraphy and 

 structure of the South- West Highlands. Discussion based upon 

 detailed accounts of certain crucial sections is reserved for § III, 



The Loch- Awe Nappe. 



Constitution. — The structural independence of the Loch- Awe 

 Nappe cannot be appreciated without extensive trespass into the 

 country surrounding the nappe. Discussion of this cognate 

 matter is, therefore, reserved for a later paragraph. Meanwhile, 



