324 ME. E. B. BAILEY ON THE [Dec. 1914? 



(1) The Slides. — Much the most important slide is the 

 Ballachulish Slide, which has been traced for many miles 

 through neighbouring districts. Locally, this slide has two 

 branches, and such is the case where it crosses the northern 

 margin of the map. Between the two branches at this point, there 

 occur thick representatives of the Ballachulish Limestone (6) and 

 Slates (5). It is well known that the Ballachulish Limestone, 

 when intact, is roughly divisible into a dark-grey, or black, com- 

 paratively pure limestone, next the Ballachulish Slates, and a 

 pale-grey, or cream-coloured, highly-impure calcareous division, 

 next the Leven Schists. Of these two parts, only the pure black 

 Limestone is preserved between the two branches of the Balla- 

 chulish Slide : the impure portion is cut out by the western, or 

 lower, branch of the slide, which, as already stated, also elimi- 

 nates the pelitic division of the Leven Schists (7). East of the 

 eastern, or upper, branch of the Ballachulish Slide, occurs a folded 

 complex of Appin Quartzite (4), Appin Limestone (3), and Appin 

 Phyllites (2). 



South of the stream which flows past the Post Office, only the 

 lower branch of the Ballachulish Slide has been traced. Its effect 

 is generally to bring the black Ballachulish Slates (5) into direct 

 contact with the banded Leven Schists (7). Locally, as at the 

 road beside Loch Creran, a thin band of dark Ballachulish 

 Limestone (6) is interposed between the two. 



On crossing Loch Creran, one can recognize at first only a 

 single branch of the Ballachulish Slide. It brings Appin 

 Quartzite (4) with sometimes a thin marginal layer of calc- 

 silicate-hornfels, probably Appin Limestone (3), against banded 

 Leven Schists (7). 



A mile farther on there is a return to the conditions met 

 with at the northern margin of the map. The Ballachulish Slide 

 is double, and includes between its two branches black pure lime- 

 stone and hornfelsed black slates, belonging respectively to the 

 Ballachulish Limestone (6) and Slates (5). The two branches of 

 the slide have been traced eastwards, until terminated hj a powerful 

 fault, which displaces their outcrop to Allt Buidhe. Both branches 

 are found here, including between them an important belt of Bal- 

 lachulish Limestone. This latter is, in places, black and still a 

 limestone or marble; but elsewhere, especially where it turns north- 

 wards up hill from Allt Buidhe, it occurs as a thick mass of pale- 

 greenish calc - silicate - hornf els, the baked representative of the 

 impure calcareous division which normally separates the black 

 limestone from the Leven Schists. The mapping of the two 

 branches of the slide is only approximate in the vicinity of the 

 stream, owing to the considerable cover of morainic material 

 thereabouts. It is known, moreover, that in the more westerly 

 exposures both Ballachulish Limestone and Appin Limestone 

 occur, the former well seen immediately south of the stream, 

 the latter actually in the bed of the same. The upper branch of 

 the slide should, therefore, be drawn at this point in the middle 



