OF THE PARALLEL ROADS OF LOCHABER. 
679 
the greater wear and smoothness of the hill slopes flanking the valley below a level of 
about 2,000 feet or so.”* In Glen Arkaig he traced glacial striae up to 700 feet above 
the loch,t and believes them to extend higher. On the north side of Glen Gluoy, at 
the angle of the ridge between it and Loch Lochy, Mr. Jamieson found, at about 
260 feet above the bridge, glacial striae pointing W. 25° N.; again, on the shoulder of 
the hill between Glen Gluoy and Glen Spean at an elevation of probably 800 to 900 
feet, striae pointing W. 5° N., and a little lower others directed W. 20° N. “ running, 
not horizontally, but up and down the slope;” while nearer Glen Spean and at a lower 
level were striae pointing W. 15° N., W. 45° N., and W. 12° N., or as though directed 
from Glen Arkaig, with most rock wear on the western side. At Blackletter he found 
the striae point W. a little N. In Coire ’n Eoin they were northward down the glen. I 
In a later paper Mr. Jamieson speaks of hills of 2,000 feet, the summits of which 
exhibit ice-worn surfaces, but does not give the particular localities.§ 
Professor Tyndall says that at the head of Glen Glaster all the dominant hills are 
intensely glaciated.|| 
In adjacent districts Professor A. Geikie records some instances of glaciated sur¬ 
faces at heights of from 1,500 to 2,000 feet, but notices very few exceeding those 
heights ;11 while Dr. J. Geikie states generally that in the Western Highlands ice- 
scratches may be traced from the islands and the coast line up to an elevation of at 
least 3,500 feet, and “that the ice could not have been less and w r as probably more 
than 3,000 feet in its deeper parts.”** 
In the second Report of the Committee on Boulders, it is recorded that traces of ice- 
wear exist on the north and west sides of Ben Trishlih, on the north side of Loch 
Linnhe, at a height of 1,566 feet.tt 
My own observations were confined chiefly to the glaciation at lower levels, which 
is so general, and has been so often noticed, as to require no special description. 
Wherever in the valley of the Spean the bare rocks are exposed, they are almost 
everywhere rounded and moutonnees, but are generally too much weathered to show 
the direction of the striae. Such glaciated surfaces are especially frequent between 
Roy Bridge and Loch Laggan, and on higher ground they are conspicuous on the south¬ 
west flank of Craig Dhu, below and above No. 4 road; on the south flank of Tombrahn, 
at the head of Glen Roy, under and above “ roads” Nos. 2 and 3; and at the entrance 
to Larig Leacan, at a height of from 1,000 to 1,200 feet. The Leacan there hows 
through a narrow pass, the rocks on both sides of which are strongly glaciated and 
* Quart. Journ. Geol. Soc., vol. xviii., p. 172. 
f Or 840 feet above the sea. 
J Quart. Journ. Geol. Soc., vol. xix., 245-246. 
§ Ibid., vol. xxx., p. 328. 
|| Proc. Roy. Inst. Gt. Britain for June, 1876, p. 10. 
f ‘ The Glacial Drift of Scotland,’ pp. 16-34, 1863. 
** ‘ The Great Ice Age,’ 2nd edit., p. 65, 1877. 
tt Proc. Roy. Soc. Edinb., vol. vii., p. 161, 1875, 
4 S 
MDCCCLXXIX. 
