104
T. M. KEADE ON THE DEIFT-BEDS OE THE
compact bine Till, A, full of scratched Carboniferous-limestone boul-
ders and pebbles.
Fig. 22. — Section in the left bank of the Calder, near Cock Bridge.
Surface of water.
A. Hard, compact blue Till.
C. Sand mixed with blue clay.
B. Boulder-bed.
The limestone boulders are irregularly scratched ; and the stones
are paitiaHy rounded. It precisely resembles a Till very commonly
met with in the west of Ireland, in Galway and Clew Bays. This
bed is remarkable as containing stones not found in the basin of the
Calder ; and it appears to have been forced up through a comparatively
narrow gorge from the Bibble basin*. At Mitton Bridge, on both
banks of the Bibble a rounded-boulder drift (principally limestone)
is seen resting upon a blue limestone Till similar to that just de-
scribed as occurring on the Calder. The whole are seen to rest on
Carboniferous shales.
Ascending the valley of the Bibble, we find the Drift changes to a
more moraine-like character. At Bibble Bank a gravel-pit on the
right of the road from Settle to Houghton contains boulders of both
dark- and light-coloured Mountain Limestone, often fossiliferous, in-
termixed with hard grit and some sandstones in a matrix of Macadam-
like gravel. At the Craven Lime Company's quarries, nearer
Moughton, some very interesting sections were disclosed, which I
give. Fig. 23 shows moraine-like, hard, calcareous Till standing
Fig. 23. — Section in the Craven Lime Company's Quarries between
Moughton and Settle.
A. Till with boulders.
B. Angular limestone gravel.
with a vertical face. The boulders in A A, are mostly of light-

• Since writing this, I find Mr. Tidcleman points out tbattbere is in the gorge
  

of the Calder a "roche moutonnee " well scratched, and also considers that the