632 D. MILNE HOME ON THE PARALLEL ROADS OF LOCHABER. 
to go into the Corry itself; but on each side of its mouth I saw large knolls of 
detritus. Now, is it possible to suppose that these knolls and hummocks 
would not have been obliterated by any glacier large enough to protrude a 
tongue five miles long across Unichan to Teandrish ? The fact, therefore, that 
one of the parallel roads comes close to Corry N‘Eoin, and that these knolls 
and hummocks of gravel are standing at its entrance, suggest to the theory of 
AGassiz an objection quite as strong as if there had been a Parallel Road inside 
of the Corry. 
(7.) The chief proof on which Mr Jamieson and Mr Jotty rely for suppos- 
ing the occupation of Loch Treig by a glacier, is the existence of long curved 
banks of gravel and boulders in the Valley of the Spean, which they consider 
to be indubitable moraines. Mr JAMIESON says, in respect of these gravel banks, 
that (“ Lond. Geol. Soc. Journal,” 21st Jany. 1863, p. 247) : “The evidence 
for the Glen Treig glacier is probably more complete than for any other glacier 
in the kingdom.” 
I confess that when I first saw these banks of gravel and boulders, viewing 
them as I could then only do from a considerable distance, I adopted the idea, 
and expressed it to Mr Joy, who was then with me, that they were moraines, 
and probably formed by a glacier in Loch Treig. 
I have now changed my opinion on this point, in consequence of several 
more minute surveys of the ground. 
The gravel banks alluded to are situated on both sides of the Spean Valley, 
a little to the east of Glen Treig. 
The plan (on Plate XLIII.), copied from the Ordnance Survey Map, shows 
these banks in red colour. 
In the first place, it will be observed that portions of Shelf 4 have been 
formed upon these banks. The banks, therefore, must have existed before the 
shelf was formed. As this fact is of importance, I may observe that, three 
years ago, I satisfied myself that it was so; and the Ordnance Surveyors, 
judging only by the appearances on the ground, came to the same conclusion. 
The shelf is, no doubt, much broken in continuity, owing to the rough character 
of the materials on which it has been impressed, and to the number of streams 
which have cut through the shelf since its lake was drained off. But the 
fragments of the shelf impressed on the banks are sufficiently numerous to 
leave no doubt that these banks must have existed previously to the formation 
of the shelf. 
Mr JAMIESON admits that Shelf 4 has been formed on these moraines, as he 
terms them. Referring to “the terminal moraines of Glen Treig,” he 
says that “at Inverlaire and around the large rocky knoll called Tom-na- — 
Fersit,” they have “ been jinely terraced by the action of the water, when at the 
level of the lowest Glen Roy line” (“ L. Geol. Soc. Proc.,” vol. xix. p. 249. 

