100 MR DAVID MILNE HOME: MEMOIR ON THE 
examination of both glens, it turns out that at this “ Parallel Roads ” period, 
these glens themselves were partially occupied by the Glen Spean Lake, which 
formed Shelf 4. 
(1.) With regard to Corry N’Eoin, a second visit to it last autumn enabled 
me to confirm my previous observation, that evidence of that lake having 
entered the corry is furnished by a series of flats on each side of its mouth, 
at exactly the level of Shelf 4, viz., 856 feet above the sea. (See sketch on 
Plate XIV.) 
Sir THomas Dick LAupDER says that he also traced Shelf 4 into the mouth 
of Corry N’Eoin. He states (page 44) that this shelf, “though faint, is easily 
followed to a ravine called Corr-a-Choilich,* whence I thought I could even 
trace it, though with some little difficulty, through an opening in a thin birch- 
wood, on the side of Aonach Mor, nearly as far as the projection of that 
mountain, where all appearances of it are finally lost.” 
From this description, it is evident that Sir THomas Lauper traced the 
shelf beyond Corry Choilzie, and through a thin birch wood, nearly as far as a 
projection from the hil] called Aonach Mor. Now, there is a thin birch wood 
at the mouth of Corry N’Eoin. That is the place where the flats occur, and 
at a level exactly coincident with Shelf 4. 
With Sir THomas Lauper, I allow that the traces of the shelf here are 
faint. But even if there were no traces, it matters little, while there exists at 
the mouth of Corry N’Eoin a large accumulation of detritus ; for such would 
undoubtedly have been swept clean away, had a great glacier flowed out of the 
Corry to form a huge ice-barrier stretching across to Teandrish. 
(2.) With regard to Loch Treig, the only other place suggested for a 
elacier, I had likewise an opportunity of confirming my previous observations 
—that Shelf 4 certainly runs along both sides of its valley. 
On this last occasion, I had the good fortune to obtain the use of a boat 
belonging to DonALpD CAMERON, an intelligent shepherd, who, when I met 
him, was going from the foot of the loch to his dwelling at the head of the 
loch. From the boat I distinctly observed, as I passed along, two lines of 
beach, one about 40, the other about 90 feet above the water, the latter 
being about the level of Shelf 4. 
At a distance of 2 miles from the foot of the lake, I landed on the north 
bank, at a sandy beach, where there was a large bank of detritus with a flat 
top, about 90 feet above the loch. One part of this bank being cut through by 
a stream from the hill, I saw that it consisted of detritus very similar to that 
prevailing in Glen Spean and Glen Roy. I found in the gravel some of the 
-* This ravine, now known under the name of “ Corry Choilzie,” is situated a few hundred yards to 
the east of Corry N’Eoin. At Corry Choilzie Shelf No. 4 is quite distinct. Beyond Corry Choilzie, and 
towards Corry N’Eoin, the shelf exists only in patches. 

