﻿6.16 MR. E. B. BAILEY ON RECUMBENT FOLDS IN THE [Nov. I9IO, 



The Meall a' Bhuirich Slide and the limestone out- 

 crop of Loch Dochard. — The outcrop of Glen Coe Quartzite, 

 which intervenes between the Leven Schist fold (g) and the belt of 

 Eilde Flags lying to the south-east, becomes exceedingly narrow 

 towards Glen Nevis, and finally fails altogether on the slopes of 

 Meall a' Bhuirich. Then, for a short distance, the Eilde Flags run 

 on in contact with the Leven Schists of the fold g (see map, 

 PL XLII); the latter, however, soon closes with a double termi- 

 nation, sending one lobe into the Eilde Flags, the other into an 

 outcrop of Glen Coe Quartzite which forms the summit of Meall 

 a' Bhuirich (PL XLIII, Section A, and map, PI. XLII). This 

 brings the Eilde Flags once more into contact with Glen Coe 

 Quartzite ; but it is not long before the latter, very gradually and, 

 as it were, reluctantly, evacuates its position, and henceforward, as 

 far as mapping has proceeded, the Eilde Flags march side by side 

 with the Leven Schists. What makes this unnatural alliance all 

 the more striking is the continued presence of the quartzite in 

 strong force in the adjacent portion of the territory occupied by the 

 Leven Schists. 



In the light of what is known of the Fort William, Ballachulish, 

 and other slides of the district, it is reasonable to regard the 

 thinning and disappearance of the quartzite just described as 

 evidence of an important slide, which has accordingly been mapped 

 under the name of the Meall a' Bhuirich Slide. 



On the east, close to the margin of the Moor of Eannoch Granite, 

 the outcrop of the Eilde Flags is interrupted by a fold of the Leyen 

 Schists (h), bounded on each side by a narrow strip of Glen Coe 

 Quartzite. The latter is rarely more than 100 feet or so thick, 

 and is sometimes absent altogether. 



It seems tolerably certain that this outcrop is the folded 

 reappearance of the Leven Schists, which farther north-west pass 

 beneath the Glen Coe Quartzite and the Eilde Flags ; and that the 

 thinning of the quartzite, here bordering the Leven Schists, is due 

 to the south-easterly continuation of the Meall a' Bhuirich Slide in 

 a highly folded condition (see PI. XLIII). Otherwise, if we assume 

 that this thick mass of Leven Schists overlies the Eilde Flags, as in 

 Allt Coire an Easain, we are faced with a very grave difficulty in 

 the absence of any suggestion of the intervention of a limestone in 

 the position of the Ballachulish Core. 



The fold h is lost sight of for a space in the Moor of Bannoch 

 Granite, but appears again in a restricted exposure north-west of 

 Allt Coire an Easain. Beyond this it may be recognized with 

 fair certainty in a group of isolated folds of the Leven Schists 

 near the mouth of Loch Dochard. These folds were originally 

 mapped by Mr. Kynaston, whose lines have been to some extent 

 modified by Mr. Clough during a subsequent visit to the district, to 

 which reference has already been made. Mr. Clough showed that 



(1) a few feet of clean white quartzite locally intervene between the Leven 



Schists exposed in these folds and the Eilde Flags outside, and 



(2) the Leven Schists themselves include a core of highly metamorphic 



limestone. 



