416 MR MILNE ON THE PARALLEL ROADS OF LOCHABER. 
toll. At several places, boulders appear to have accumulated on this higher shelf. 
Tyndrum is about 740 feet above the sea. 
(3.) Along the margin of Loch Awe, and particularly near Dalmally, there 
is a flat or terrace about 40 feet above the present level of the lake; and which 
manifestly indicates a subsidence of its waters to that depth. 
(4.) Along the margin of Loch Lubnaig, in like manner, there is a flat or 
terrace about 40 feet above the lake, and which is very visible on both sides. Here 
as well as in the former case, the flat runs back from near the margin of the lake 
to the mountains forming one side of the valley; and the steep sides of which, 
contrast most significantly with the almost horizontal flatness of the ancient and 
exposed bottom. 
At Loch Lubnaig, the flat can be traced for a considerable way on both sides 
of the valley, beyond the point where the lake now discharges itself, and, indeed, 
almost as far as Leny. At this place, as well as at Callendar, there exist. indica- 
tions of enormous quantities of gravel, which, before being cut down and carried 
away by rivers, afforded ample means of blocking up the waters of Loch Lub- 
naig to a higher level. The quantity of gravel which formerly existed hereabouts, 
may be inferred from the existence of the following remnants. 
About + mile west of Callendar, there is a ridge of gravel and sand about 
100 yards long, and from 40 to 50 feet high. Near it, there is a conical mound 
of the same materials, and about the same height, bearing a thriving planta- 
tion. The ridge of gravel to the east of Callendar, designated in guide-books as 
the Roman Camp, is merely a remnant of the ancient gravel-bed with which 
the whole valley was filled; and when it contained a lake, of which there are 
abundant indications, it is probable, that, when Loch Lubnaig stood 40 feet 
above its present level, its waters were discharged into a lower lake, of which the 
eastern margin may be seen near the Lodge of Gart-House. Ultimately the gra- 
vel heaps which held in this Callendar lake on the east, had been cut through, 
so as to allow of its drainage; and, accordingly, there are, on each side of the 
river Teith at this place, gravel banks and cliffs from 70 to 80 feet high. 
After the Callendar lake was drained, the waters which flowed out of Loch 
Lubnaig would acquire fresh cutting power, and would rapidly eat away the bar- 
rier which dammed back the lake to the higher level before referred to. 
Callendar is about 270 feet above the sea. 
(5.) In the valley in which the town of Huntly stands, there are two ter- 
races, the one about 32 feet above the other, which are very clearly the beaches 
of a lake, which has sunk from the one to the other, and latterly been drained 
off. 
(6.) A few miles south of Inverury, there are distinct traces of a lake which 
formerly filled the valley. The burgh of Kintore has been built in the ancient bot- 
tom of the lake. There are two well-marked beach-lines round the whole valley ; 
