CHAP. XL VI 
THE ACID BOSSES OF SKYE 
383 
with that lock, and with the basalt-dykes that traverse it, can be examined 
almost everywhere. The junction is usually vertical or nearly so, sometimes 
inclining outwards, sometimes inwards. It is notched and wavy, the 
granite sending out projecting spurs or veins, and retiring into little bays, 
winch are occupied by the limestone. The subdivisions of the latter rock 
have recently been traced by Mr. Harker up to one side of the granite 
and recognized again 011 the other side, with no apparent displacement, as if 
so much limestone had been punched out to make way for the uprise of the 
acid boss. The older dykes, too, are continuous on either side of the ridge. 
The granite is massive and jointed, splitting up into great quadrangular 
blocks like an ancient granite, and weathering into rounded boulders. Its 
granitic composition and texture are best seen where the mass is broadest, 
south of Kilbride. Towards. its margin, on the shore of Camas Malag, the 
granophyrie structure appears, especially in narrow ribbons or veins that 
mu through the more granitic parts of the rock. These may be compared 
with the much larger dyke ot spherulitic rock above noticed as traversing 
the granophyre of Meall Dearg. 
i iG. 34/. — Section across the north slope of Bein ’11 an Dubhaich, Skye, 
ff: tr, Cambrian limestone ; b b, basalt dykes ; c, granite. 
Immediately to the south of Camas Malag the junction with the lime- 
stone is well displayed, and the eruptive rock, which is there granitic in 
character, sends out into the limestone a vein or dyke about two feet broad, 
oi closer grain than the main body of the boss, but still distinctly granitic 
in structure. The junction on the north side is equally well seen below the 
crofts ot Torran. Here the rock of the boss, for a few yards from its margin, 
assumes a fine-grained felsitic aspect, and under the microscope presents a 
curious brecciated appearance, suggestive of its having broken up at the 
margin before final consolidation. Portions of the already crystallized 
granite seem to be involved in a microgranitic base. The rock has here 
truncated a number of basalt-dykes which intersect the Cambrian limestone, 
-lo one of these further reference will be made in the sequel. 
On the surface of the mass of Beinn an Dubhaich, a few little patches of 
limestone occur to the south of Kilchrist Loch. Considering the nearly 
vertical wall which the granophyre presents to the adjacent rock all round 
