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Proceedings of the Royal Society 
rises out of the bank in plumb precipices of say 30 to 60 feet, — a 
deep-red burnt-like porphyry, rudely columnar.” 
Stob Bhan (3274 feet) and Sgor a Mhaim (3601 feet) are both of 
them quartzite ; but the connecting ridge was found to be in some 
places almost a clay slate. 
(4) On following day, drove up Glen Nevis to Achriabhach , and 
from that walked up past Steall, and thereafter climbed the quartzite 
ridge to the N.E. The first half of the walk astonished me on 
account of the absence of boulders, in this part of Glen Nevis, — 
considering the thousands which lie at and about the mouth of the 
Glen. Above the narrow part of the glen at Meall Cumhann 
(2000 feet) the whole surface seemed swept clean. We saw only 
one boulder (micaceous schist) about a yard square. It lay on the 
S. side of Sgdr-a-Choinnich Beg (3108 feet) at an elevation of 1830 
feet. We went, in an easterly direction, over seven other hills from 
3600 to 3858 feet in height, and then descended the N.W. slopes of 
Stob Coire Chalourie to Corrie Coilzie. Until we came near this 
last named place, we saw no boulders. Between the heights of 1740 
and 1260 feet on the N.W. slope, we came upon eight boulders 
lying rudely in a line, “as if part of a lateral moraine.” They 
were all much of one size, about 6x6x5 feet ; and they were 
of two kinds of rock only, viz., the Livingston rock, and a grey 
granite rather fine in grain;— the site of neither rock is known 
to me.* 
(5) Another excursion was made with Mr. Livingston to Craig 
Dhubli , a hill near the mouth of Glen Boy. We found a number of 
huge boulders at 1780 feet, and extending to within 20 feet of summit, 
(which is about 2200 feet above sea). They lay on S. and S.S.E. 
side of hill. There was well-marked glaciation, with much rounding 
of rock-surfaces at 2050 feet, in a line N.N.W, and S.S.E. ; and it 
seemed to us that the movement had been from the last point, but 
we had not time to satisfy ourselves on the point. All the boulders 
seen on this hill are of the same two rocks as those seen above Coire 
Choilzie (i.e., on the slopes of Stob Coire Chalourie , at the height of 
1740 feet), over which we had passed two days previously. 
* Professor Duns having read these notes, informs the Convener that 
boulders of the kind of rock here mentioned (Livingston rock), were observed by 
him on the slopes of Meall an t Suidhe, near the mouth of Glen Nevis. 
