428 HIND : CARBONIP^EROUS ROCKS OF THE PENNINE SYSTEM. 
Cold Coniston, on the west. This limestone is the usual massive, 
white form, crammed with shells, like that seen at Clitheroe, and 
the great fossil localities of Derbyshire and Staffordshire, and moreover 
contains an identical fauna. It is known to be overlaid by shales 
and a black limestone below Thorpe and Rylstone Fells, which contain 
the typical Pendleside fauna. But a most instructive and interesting 
section is to be seen on the south side of Dibbs Bridge, about four 
miles east of Grassington, on the Pateley Bridge road, which is identical 
with the section at the foot of the Wiimats, at Castleton, containing 
a bed which Messrs. Barnes and Holroyd have described as a beach 
bed (Trans. Manch. Geol. Soc, Vol. XXY., page 119). 
The section shows — 
Post of limestone with shell fragments and Produdus 
giganteus. 15 feet. 
Post of shelly limestone not much rolled. About 10 feet. 
^Bed of rolled shells, lenticular shell fragments, and rolled 
pieces of limestone. 4 feet. 
Post of limestone with many specimens of Produdus giganteus. 
G feet. 
Hard blue limestone. 15 feet. 
The bed marked is quite undistinguishable from the similar bed 
at Castleton. I saw several samples of this rock some four miles further 
west, on the road between Threshfield and Linton, and Threshfield 
and Grassington, in the stones piled for road-making. In this I got 
the peculiar dark masses of foraminiferal limestone imbedded in 
white limestone, which Messrs. Barnes and Holroyd have recently 
described. The exact similarity of the upper beds of the limestone 
of Craven and Derbyshire is very striking, and at any rate points to 
similarity of conditions of deposit. I myself believe that the two 
sets of beds are on the same horizon, and present a well-marked 
stratigraphical line. In the Craven district the Pendleside series 
quickly thins out, so that from Appletreewick to Greenhow Hill, 
and for some distance from Grassington northward, the grits im- 
mediately overlie the Limestone Massif, and nowhere north of a line 
passing from Settle, vid Malham, to Hebden (Wharfedale) has the 
Pendleside fauna been yet obtained, but it occurs in the shales in the 
