of Edinburgh . Session 1877-78. 
699 
gravel, and beds of sand are abundant in the valleys of Strathblane 
and Campsie, he had never found any marks of grinding or striation 
on the rocks in these valleys. These effects seemed to have been 
produced at levels higher than 400 feet above the sea. 
On another occasion, when geologising on the Campsie hills, 
above Glorat, situated 3 miles to the east of Campsie, and at a 
height of 800 feet above the sea, I found the sandstone rock 
striated, in a direction due E. and W. On the Kilsyth hills, a few 
miles still farther east, and at a height of 1200 feet above the sea, 
the striations on the rocks were seen to be E. and W. 
g. One other fact observed was the immense accumulation of 
boulders of all kinds at Croyliill, a knoll of trap, at the summit 
level betweeen the firths of- Clyde and Forth — viz., about 1G0 feet 
above sea-level. As some of these boulders were of u old co?i- 
glomeratef they afford additional evidence of an agency which 
brought them from the westward.* 
h. In addition to these facts, notice may be taken of two 
boulders reported to the Committee by Mr Jack of the Geological 
Survey. One is of mica slate, weighing about 6 tons, on the 
Kilsyth hills, at 1260 feet above the sea, the parent rock of 
which Mr Jack supposes to be situated about 15 miles to the 
north. The other is of conglomerate, weighing about 7 tons, 
on the north hill of Campsie, at 1803 feet above the sea, with its 
longer axis W. 20° JST. Its parent rock is supposed by Mr Jack to 
be to K.W. (First Keport of Committee, p. 51.) 
Kow what do all these facts prove ? They prove that an agent 
of some kind or other moved over this district, having a depth of 
at least 1800 feet, and covering a great breadth of country; and 
that, whilst this agent was moving, the rocks over which it passed 
were ground down and rutted and striated ; large boulders, at a 
high level, were carried forward, and boulders at a low level 
were pushed in a similar direction. 
There is an additional fact deserving notice. The valley at 
Lennoxtown, where the pyrites coal strata are worked, seems to 
have at one time been filled up by these strata. These strata now, 
however, exist only on each side of the valley. Some agent has scooped 
them away, whereby the present valley was excavated ; and it is 
* “Estuary of the Forth,” p. 95. 
