202 GEOGNOSTICAL SKETCH OF THE 
Fourth Kange. 
Resting upon, and immediately succeeding the moun. 
tains of quartz-rock I have just been noticing, there occurs 
a ridge of a lower and smoother outline, which commences 
above Dores, and, after passing, in a continued line, by the 
Muir of CuUoden, gradually falls into the low lands situate 
between Fort George and Nairn. The bearing of this 
ridge tends more to the east than that of the chain imme- 
diately preceding it, and hence it does not lie in the pro- 
longed Hne of the edge of the Loch. Consequently, be- 
tween this ridge and the centre of the valley, which we 
may consider as the river Ness, there intervenes a space of 
from one to two miles. This space is covered by a series 
of alluvial matters, which, together with a similar deposit 
fronting the sea between Fort George and Inverness, shall 
be afterwards particularly noticed. At Dores, one or two 
bills occur, formed of red sandstone, and described several 
years ago : they are quite partial, and are to be consider- 
ed as parts of the sandstone formation formerly described, 
as extending to the neighbourhood of Dochfour, on the op- 
posite side of the valley. 
This ridge, which forms the fourth and last chain in the 
circular view from Inverness, is known under the name of 
the Leys, and may be distinctly seen in its whole length 
from the rising ground immediately above Inverness. As 
seen from this position, the Leys seem to proceed from the 
borders of Loch Ness, or Strath Errick, and run in an 
uniform direction all the way to Nairn, where they are lost 
among the alluvial and sandstone formations of that county. 
The most singular character of this ridge, and the one which 
distinguishes it from every other chain in the country, is its 
