332 
Proceedings of the. Royal Society of Edinburgh. [Sess. 
II. Glaciation of the District surrounding Inchnadamff 
AND ALLT NAN UAMH. 
In the mountainous district around Inchnadamff there is clear evidence 
of intense glaciation. The most striking feature of the glacial phenomena 
is the evidence pointing to the conclusion that during the maximum glacia- 
tion the ice-shed did not coincide with the existing watershed.* The 
striae at great elevations and the distribution of the boulders prove that the 
ice-parting lay to the east of the present watershed during the climax of 
glacial conditions. The ice must have accumulated to a great thickness on 
the less elevated plateau occupied by the Moine schists east of the Ben 
More and Breabag range. 
During the maximum glaciation the general movement of the ice-sheet 
at great elevations in this district was in a westerly direction. On Glas 
Bheinn (see map, fig. 1), at a height above 2000 feet, the striae point W. 5° 
N. ; on Bealach an Uidhe, between Glas Bheinn and Beinn Uidhe, the direc- 
tion is W.S.W. at an elevation of about 2000 feet. On the quartzite of 
Beinn an Fhuarain, east from Inchnadamff, between the 2000- and 2250-feet 
contour-lines, the trend is north of west. In the high pass north of 
Conamheall that leads into Coire Mhadaidh, at a level of 2750 feet, the 
direction is W. 10° S. or W.S.W. Farther south, on the long ridge of 
Breabag, finely striated surfaces of quartzite have been recorded, which 
point to an ice-movement in a westerly direction. 
Confirmatory evidence of this westerly movement is obtained on the 
mountains north and south of Loch Assynt. On Quinag, at an elevation 
of 1750 feet, the striae point W. 5° N., and on Beinn Gharbh, about 
the 1500-feet contour-line, the direction varies from W. 10° S. to W.S.W. 
On the eastern slope of Canisp, the striae point north of west, indicat- 
ing an ice-movement up the slope in the direction of the plateau of 
Lewisian Gneiss. 
The evidence furnished by the dispersal of the boulders also points 
to a westerly ice-movement across the mountainous district around 
Inchnadamff during the maximum glaciation. About 2 miles east from 
Inchnadamff, on the crest of Beinn an Fhuarain, — a hill composed of 
Cambrian rocks, we found boulders of thrust Lewisian Gneiss that have 
been carried westwards from the deep corries north of Ben More Assynt. 
Farther north, on Mullach an Leathaid Riabhaich, similar blocks of Lewisian 
Gneiss rest on the quartzite at a height of 2250 feet. On Breabag, on the 
* Peach and Horne, “The Ice-shed in the North-West Highlands during the Maximum 
Glaciation,” Brit. Assoc. Rep. for 1892, p. 720. 
