File:The Quarterly journal of the Geological Society of London (13204558925).jpg

NORTH-WEST OF ENGLAND AND NORTH WALES.
105
coloured limestone (Scar limestone ?) ; the small ones are angular,
the larger partially rounded. Laminated beds, B B, are of angular
limestone gravel ; it is just like the worn Macadam off a road. It
contains a larger proportion of dark limestone than the Till it is
imbedded in. This limestone is fossiliferous, whereas that in the
Till hardly contains any fossils *.
In fig. 24, a shows white Scar limestone partially worn on the sur-
face but not glaciated, and in steps, as shown ; 6, Till similar to A in
section fig. 23 ; c, laminated loamy bed ; d, Silurian-grit boulder.
These boulders of Silurian rock seem to be always at or near the
bottom of the Till. A very large boulder of this rock was lying
loose on the limestone.
Fig. 24. — Another Section in the Quarries between Houghton
and Settle.
At the Ribblesdale Lime and Quarry Company's quarries at
Moughton, just in front of the limestone Scar, the underlying Silurian
slates are well rounded by glacial action over a space 200 yards by
50 yards ; and probably much more rock similarly affected would be
seen if the drift were cleared away. I traced this glaciated surface
to within 20 yards of the limestone Scar ; and it may approach it
nearer, as the Silurians are covered with drift and quarry debris. This
is extremely interesting as showing that the Scar has not receded
more than 20 yards since a glacier filled Eibblesdale.
Descending again to the lower lands nearer the sea, we find in
walking from the bluff on the Eibble above Bezza Brook, but below
Ribchester, towards Blackburn that the drift gets yellow and full
of local materials from the Carboniferous sandstones. At the
base the debris seems to be from the coal-shales. The valleys
have very steep sloping sides ; and no flats or terraces occur after
leaving the Ribble.
At Preston, Mr. De Ranee says, the " Middle Sands " occupy a
very large area of the town, one of these knolls rising to the
surface, surrounded by the " Upper Boulder-clay to the north-
west and east ;" and he enumerates many of the public buildings
that are built on this drift. .

• At the south end of this section a second " bench " showed that the Till