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 

 course of the ice was up the river and southwards (Q. J. G. S. 1872, p. 479). 



