File:The Quarterly journal of the Geological Society of London (13204752175).jpg

ROCKS OF THE NORTHERN HIGHLANDS. 365
2. Section along the road from Ullapool to the S.E.
Near the hotel the Torridon is succeeded by the Quartzite, dipping
E.N.E. at 15° and conformably overlain by Brown Flags and the
quartzite which holds the place of the Salter -ella-zone. At the bridge
and fall, red sandstone, un distinguishable from the Torridon, suddenly
comes in ; and close by is a small exposure of dolomite, with a dip of
10-15° to E.N.E. As the place of the latter is on the high ground,
200 or 300 feet above, there must here be both a faulting-up of the
Torridon and a faulting-down of the dolomite. Torridon then re-
appears, overhanging the road for some distance, and is overlain by
quartzite, the relations between the two being obscure, owing to the
absence of clear bedding. The quartzite is apparently overlain by
the Caledonian.
This section differs materially from the preceding, though they are
drawn along lines which diverge from each other not more than
200 or 300 yards at the maximum. The level of the present section,
however, is about 100 feet higher. The Hebridean, though con-
spicuous on the shore close at hand, does not appear ; and there are
no signs of the inversion of the Torridon on the Quartzite. The
Dolomite (which, on the received hypothesis, should intervene be-
tween the Quartzite and the Caledonian) is also wanting in its proper
place.
3. Section from Ullapool to the E.S.E. (fig. 1).
This section starts from the same point as the last, but keeps the
top of the slope above the road. Passing over the Torridon, Quartzite,
Brown Elags, and /SVtZ^r^Z/a-quartzite, we come to the Dolomite,
which rises in dip, and to the east is suddenly contorted for a
breadth of about twenty yards into a regular series of sharp folds,
having evidently been crumpled up against the Hebridean, which
appears near at hand. Beyond the Hebridean we soon reach
grey th^n-bedded gneiss (Caledonian) with undulating and unde-
cided dips.
Fig. 1. — Section from Ullapool to the E.SE.
W.N.W. / / E.S.E.
For explanation of the letters (c &c.) see Synopsis of formations, p. 355.
//. Faults.
Following the Dolomite and Hebridean respectively along the
strike to the N.N.W., the broken nature of the ground becomes very