J. F. Campbell Collection > Additional memoir on the parallel roads of Lochaber

PARALLEL ROADS OF LOCHABEE.
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Fraser that similar deposits exist to the very top of the ridge dividing Strath
Errick from Strath Spey, at a height of about 2500 feet above the sea. In the
A, present Channel of Foyers River.
B, line of old Kiver, cliff about 20 feet above A.
C, line of older Kiver, cliff about 60 feet above A.
adjoining glens of " Glen Markie," " Corry-an-Yack," and "Alt-om'," I learnt
that similar drift deposits exist, and at about the same heights above the sea.
In the upper parts of the Foyer River, there are numerous terraces formed
on the drift, at heights of from 40 to 60 feet above the stream. Slojiing as they
do doivn with the stream, they must have been formed when its channel was
at a higher level.
II. Localities cohere Lakes exist, dammed by Detritus, and shmving Subsidence or
Disappearance.
Loch Killin is traversed by the River Foyers. It is about half a mile long,
and about 200 yards wide. At its west or lower end, there is a terrace on each
side, from 40 to 50 feet above the jiresent level of the lake.
Loch Duntelchak is situated the S.W. of Inverness, and about 8 miles distant.
There is an old detrital blockage at its lower or east end, through which the
stream now issuing from the loch had evidently cut its present channel.
The mounds of drift, which formed the blockage, are about 40 feet above the
lake, indicating that the lake had been that much higher.
In walking along the north bank of the lake, I found an old beach line
about 40 feet above its present level.
At that time, there must have been a communication between Loch Duntel-
chak and Loch Aschley, situated about half a mile to the north, and the level