580 
nearly as much divided into thin beds or plates as the rest. 
Instead of the solid, homogeneous character which it presents 
elsewhere, it is here almost schistose in the degree of its 
lamination, dark from bituminous exudation, traversed by 
innumerable veins of spar, and nearly destitute of fossils. 
Great faults occur occasionally, chiefly in the N. and S. line, 
and their course is usually marked by thick veins of spar. 
The northern slope of the anticlinal may be found in an old 
quarry near the Canal, west of Thornton. Near Salter forth 
the grit appears, thrown off by the protruded limestone, 
and dipping from it at an angle of 15° to 20°. At Keld- 
brook, on the southern side of the valley, there is a 
considerable thickness of grit, shales, and flagstone, dipping 
N.JST.W"., i.e. (away from the Lothersdale anticlinal), at a 
variable angle of 20°. 
Slaidburn. — Here the limestone occupies two long oval 
spaces in a hollow, as at Thornton. The dark shales are 
fossiliferous at Black Hall and Harbour. The limestone 
beds appear to be both more complex and less contorted than 
in the anticlinals near Skipton. At Sykes, on a parallel 
axis, a remarkable vein of spar runs along a line of fault at 
the apex of the main flexure. 
Lothersdale. — The mineral characters of the limestone are 
similar to those already described. The contorted beds dip 
beneath the grit of Pinnow Pike. In a small quarry N.W. 
of the principal works, the beds are nearly horizontal, and 
here intercalated chert occurs in regular seams. At Raygill 
is a vast quarry of contorted limestone. The beds are much 
faulted, but their anticlinal disposition can be readily made 
out. Great veins of spar traverse the limestone in the lines 
of fault ; one such vein was 15 in. thick, and of unknown 
length; at least 50 yards were seen. This limestone, and the 
similar rock of Skipton and Thornton, is used for road metal 
over a great part of the West Eiding; in part of Lothersdale 
