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



North of Glen Nevis the Fort William Slide suffers a local 

 displacement to the west, obviously determined by movements x 

 accompanying the introduction of the Ben Nevis Granite. For a 

 short distance along the outcrop of the slide, thus displaced, the 

 Ballachulish Limestone has almost disappeared from the section, 

 permitting the Leven Schists to approach within a foot or so of 

 the outcrop of the Eilde Flags. A little farther on, however, the 

 Ballachulish Limestone re-appears in force, once more to separate 

 the two (PI. XLIII, Section A) ; then the Glen Coe Quartzite 

 begins to show, intervening between the limestone and the flags : 

 and finally in the Spean, where both limestone and quartzite are 

 strongly developed, their outcrop is separated bj^ a narrow strip of 

 the Ballachulish Black Slates (fig. 2). 



Fig. 2. — Horizontal section showing the Fort William Slide 

 in the Spean Valley. 



RAILWAY VIADUCT 



W.N.W. 



2 MILES 



[5 = Ballachulish Slates ; 6 = Ballachulish Limestone ; 7=Leven Schists ; 

 8=Grlen'Coe Quartzite; 9=Eilde Flags.] 



The following section is met with in the Spean near the railway 

 viaduct — from north-west to south-east — Eilde Flags (9), Glen Coe 

 Quartzite (8), Ballachulish Slates (5), Ballachulish Limestone (6), 

 and lastly Leven Schists (7). Were it not for the symmetrical 

 development of the Appin Core between Glen Nevis and Onich, it 

 would be hard indeed to realize that the Ballachulish Slates in this 

 section occupy the heart of a synclinal fold, rendered asymmetrical 

 through the operation of a fold-fault. 



A slide complementary to the Fort William Slide has 

 been detected near the south-eastern limit of the Appin Core, in 



1 Mr. H. B. Maufe points out that the displacement may perhaps be due to 

 the local sagging down of the schists at the granite inargiu [33]. 



