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a junction of the slate and granite is very well exposed. A glance 

 at the map will explain the occurrence of the granite here. The 

 principal junction is at the point where the river comes close in under 

 the bank, along which the road passes. Here there are some pecu- 

 liarities well worthy of notice. The two rocks are seen to come 

 close up against one another, 'most distinctly contrasted ; but there 

 are no veins emanating from the granite. This rock is coarse-grained, 

 much coarser than in any other junction we have noticed, yet it is 

 more compact than the coarse-grained granite usually is, and, though 

 hard, brittle. About one hundred yards down the stream a vein 

 of fine compact granite, five feet broad, traverses the slate ; and thirty 

 yards farther, another vein, one foot broad, bluish coloured, fine- 

 grained, and very brittle. The entire mass of slate, between this 

 lowest vein and the mam junction above, is much altered; it is 

 extremely hard and tough, contorted in the laminae, and being much 

 veined with quartz, is assimilated in aspect to a granitic rock. 

 Below the lowest vein it speedily assumes its usual appearance. Mr. 

 Ramsay was the first to notice this interesting junction; and it is 

 well described by him. Several other junctions may be seen in 

 the branches of the main stream. 



A little farther down the glen, and less than one mile from the 

 bridge, some well marked glacial striae are seen on the road-side, upon 

 a mass of slate in situ. They cross the laminae, and are directed 

 nearly due east and west. The slate also is rounded off. On the 

 hill to the north, some great blocks of coarse granite rest upon the 

 slate. These travelled blocks reach a good way up the south front 

 of the coast range; but in crossing, on one occasion, along the 

 summit, keeping generally near the edge of the cliffs, we did not find 

 a single block. It would seem, therefore, that the few, and com- 

 paratively small blocks, on the north shore, must have worked 

 round, from either side, under the force of the waves. Slate was 

 found everywhere on the summit, and far down upon the steep fronts, 

 where the junctions take place. Some curious varieties of slate will 

 be observed in the river bed, on both sides of the bridge. A short 

 distance below the bridge, we leave the slate, and, after an interval, 

 come on coarse conglomerate, no junction being visible. 



Many years ago, a large population, the largest then collected in 

 any one spot in Arran, inhabited this glen, and gained a scanty subsis- 

 tence by fishing, and by cultivating fertile plots on the sunny hill-sides. 

 Forty or fifty years ago they were obliged to leave, and furnished with 

 the means of reaching Canada. Garden enclosures, and ruined wall- 

 steads, still remaining, give a melancholy interest to this secluded glen. 



