File:The Quarterly journal of the Geological Society of London (13205105734).jpg

ROCKS OE THE NORTHERN HIGHLANDS.
399
bay the rock is covered by sand
for 120 yards, the only gap in
the entire section ; and this is
really filled in a little higher
up at the road-leveL This sand
must mask a slight fault and a
syncline ; for on its western
margin we come to higher beds
with an opposite dip. The first
of these is the base of the Do-
lomite, dipping easterly at 25°.
This rock is underlain at the
Pictish Tower by the Salter ella-
grit, with fossils, followed in
regular order by the Brown
Flags and Annelidian Quart-
zite, the basset edges of the
strata cropping out regularly
from E. to W. Then the Quart-
zite becomes horizontal, and
further on dips south-westerly,
and is overlain in normal se-
quence by the Brown Elags
(50-60 ft.), Salterella-gnt (15
ft.), and Dolomite. The last-
named is in full force, dipping
steadily to the S.W., its lower
(dark) and upper (white) mem-
bers being as completely ex-
posed as at Inchnadamff. AVest
of the Pictish Tower, the Assynt
series is thus seen to lie in a
broad low arch, and there can
be no question that the beds
are uninverted.
Coming back to the east end
of this section, we observe a fact
which, for the sake of simplicity,
I omitted in my first description.
Resting on the Dolomite at
the little bay is quartzite un-
derlain by flags, dipping in the
same direction as the Dolo-
mite, but at a higher angle
(50°-60°), so that the edges of
the upper beds abut obliquely
onto the bed-surfaces of the
Dolomite. Vie ascertain by
further study that these over-