922 
Proceedings of the Poyol Society 
a glen called Corny N^Eoin^ I found, at two different spots, rocks 
so striated as to show that the striating agent had moved from 
N.lSr.W., in the direction of the Spean valley* 
(7) In the Spean valley itself there are at least a dozen places 
where the rocks by the marks on them distinctly show severe pressure 
and friction by some body passing over them in a S.E. direction,* 
(8) Keference having been made to terraces or banks of detritus 
on the slopes of the hills to the south of Loch Treig^ tip to a height 
of about 1400 feet above the sea, it is proper to mention that 
similar banks of detritus occur on the hills to the north, and at about 
much the same level. 
On ChUnaig Hill (before referred to) there are two SUch banks at 
a height above the sea of 1253 feet and 1373 feet. 
The hill on the opposite or east side of this valley shows similar 
banks, and along which I walked at rather a lower leveL 
It appeared to me that these had very probably been formed 
when the land was submerged. They ate essentially different from 
the old lake beaches, in respect of their Want of horizontality. 
(9) Lastly, I refer to the fact, that almost at the very tops of the 
highest adjoining hills great boulders are found, and in such positions 
as to show that they could not hUve come there except by floating 
ice. Thus, Darwin refers tb the boulders on the top of hills in 
Lochaber, at the heights of 1700 and 2200 feet above sea-level. 
On the tops of two hills adjoining Loch Laggan, exceeding 3000 feet 
above the sea, I was informed by Sir John Kamsden of Ardverikie, 
the proprietor of these hills^ that there are several large granite 
boulders. 
Whilst expressing my own opinion that the kaims and boulders 
in the valley near the junction of the Eivers Spean and Treig 
indicate the agency of the sCaj it is proper to advert to the 
opinion of my geological friend, Mr Jamieson of Ellon, that these 
are the moraines of a glacier which, generated in Glen Trieg, 
advanced into and crossed the Spean valley. 
Mr Jamieson adopted the view originally suggested by Agassiz, 
that the barriers of all the old Lochaber lakes consisted of ice. It 
being necessary to find a barrier for the Glen Eoy Lake not only 
* These places are named in the “ Memoir on Parellel Roads,” by Professor 
Prestwick and me respectively. 
