144 GEOLOGY OF ARRAN. 



crests deeply, are the same dikes which were here seen to 

 intersect the bed of the lorsa and ascend the ridges to the 

 west to emerge from the fine granite which covers the 

 lower slopes and again traverse the coarse variety on the 

 higher summits. There are many routes now open to us by 

 which to complete our day's walk. We may diverge to the 

 right and examine the great deposits of decomposed granite 

 at the head of Glen Catacol which we once hoped would 

 be found suitable as a china-clay, but which turned out to 

 be too coarse and gritty then ascend Ben-Bharrain, pass 

 along its horse-shoe crest, and then, having crossed the 

 junction of the granite with the slate, which here ranges 

 W. 25 S., or nearly "end on" to it, dipping S. 25 E. at a 

 high angle, descend upon Imochar; or we may pass on 

 southwards by the base of Sail-Chalmadale to the mouth of 

 the lorsa, the two routes here uniting at Dougrie. We are 

 then near comfortable quarters at Auchincar ; or, by previous 

 concert, a vehicle may be in waiting to carry us to Brodick 

 ten miles very welcome it will be after so long a march. 



If the day is bright and yet young, we may lengthen our 

 walk pleasantly by passing from the waterfall to the summit 

 of Sail-Chalmadale, examining the junction of the coarse and 

 fine granites, and the veins of the fine in the coarse, which 

 are well seen on the southern front thence we may descend 

 again into the valley of the lorsa, mount the eastern ridge 

 and examine whin dikes which traverse both granites, in 

 the gullies which furrow its sides, pass upwards to the 

 plateau on which Loch Ghnuis is situated, examine the 

 singular junction there, already described, and descend to 

 Brodick either by the Garbh-Alt and Glen Rosa, or cross 

 the wild moors south-eastwards to the summit level of the 

 " String." It will be a good day's work one whose perform- 

 ance more than once we know to be possible without serious 

 fatigue. 



