﻿608 ME. E. B. BAILEY ON EECTJMBENT FOLDS IN THE [Nov. IC)IO, 



encountered thrown down against the limestone and quartzite 

 outside (PL XLIV, Sections E & F). 



The schists are then hidden for a space beneath the Glen Coe 

 Lavas, but reappear in Coire Mhorair 2 miles farther north-east 

 (Section E). Here the Ballachulish Limestone (6) is well 

 exposed. It is of considerable thickness, and dips steeply away 

 from 10 feet of the black Ballachulish Slates (5), which in turn 

 are separated by 50 feet of the grey Leven Schists (7) from a thick 

 development of the Glen Coe Quartzite (8). The section here is 

 at once so special in its characters, and so precisely similar to 

 that which has been traced up Glen Coe to the boundary-fault 

 of the cauldron, that there can be no hesitation in recognizing the 

 Ballachulish Slide in the boundary-plane between the black and 

 the grey pelitic rocks denned above as Ballachulish Slates and 

 Leven Schists respectively. 



Again the schists are hidden to the east beneath the lavas, and 

 the first exposure of them in this direction belongs to the Eilde 

 Flags (9), striking south-eastwards parallel to the outcrop of the 

 base of the volcanic group. Now, outside the fault the Eilde Elags 

 are next-door neighbours of the Glen Coe Quartzite (8) ; it is 

 therefore reasonable to suppose that the continuation of the outcrop 

 of the latter, seen in Coire Mhorair on the north-west, is just 

 hidden beneath the base of the lavas. This view is confirmed at 

 the foot of Stob Dearg, where the quartzite emerges, in good 

 form, running side by side with the Eilde Flags until once more 

 overstepped by the lavas still farther south-east. Beyond this 

 overstep it reappears in Allt Coire an Easain, precisely in the 

 position in which it might have been expected. Here the quartzite 

 is very thin, and the section is as follows : — 



Breccias of Volcanic Group. 



Thick hornfelsed pbyllites (Leven Schists, 7). 



Thin calc-silicate hornfels (Ballachulish Limestone, 6). 



Thin quartzite (Glen Coe Quartzite, 8). 



Eilde Flags, 9. 



It seems certain 



(1) that the thick phyllites mentioned above belong to the thick covering of 



Le-ven Schists which overlies the Ballachulish Limestone in the Glen 

 Coe section outside the fault ; 



(2) that the limestone is a continuation of the Ballachulish Core ; and 



(3) that the further attenuation of the rocks beneath this limestone, in- 



cluding a marked reduction of the Glen Coe Quartzite, is the result of 

 the Ballachulish Slide. 



The Ballachulish Slates are absent in this section, and the 

 Ballachulish Limestone itself is much thinner than in Glen Coe ; 

 but these circumstances are scarcely surprising, considering that 

 Allt Coire an Easain is 11 miles distant from even the nearest point 

 of the gape of the Ballachulish fold at Ballachulish. 





