72 
description of the rocks 
MILLSTONE GRIT SERIES IN CRAVEN. 
This is altogether more simple than that previously traced through 
the northern parts of Yoredale : in all the Bolland district, we see 
above the great limestone masses only one very thick shale, (with in- 
cluded limestones and ironstones), surmounted by one thick gritstone 
group. A considerable part of this shale belongs to the Yoredale 
series, which it has been already seen by the sections of Ingleborough, 
Penyg-hent, and Fountain’s fell, becomes very much of an argillaceous 
type in proceeding southward, from Wharfedale and Dentdale. How 
much of the gritstone belongs to the Ingleborough grit is more difficult 
to decide. In Fendle hill the following section, more varied than in 
many other parts of Craven, was noticed in 1827. 
Gritstone group of J 
the summit. 3 Coarse and fine gritstone : some of it holding quartz pebbles. 
Shale containing beds of black argillaceous limestone. 
20 Sandstone. 
Shale. 
50 Alternating limestone (encrinal) and shale. 
Shale, &c. 
Limestone and chert of different colours. 
Shale, &c. 
Great limestone of Clitheroe. 
In Longridge fell, though the stratification is very indistinctly seen, 
the same leading features of the millstone grit series occur as in Pen die 
lull, but no limestones appear so near to the gritstone, (limestone 
boulders occur on the fell), which is certainly varied with argillaceous 
beds and laminar sandstones. 
In examining the series on the Lancaster and Garstang side of the 
Bolland district, where the dip is generally west, we find reason to 
believe that the gritstone group is rather complicated ; consisting of 
pebbly grits, flagstones, shales, and thin coal seams ; the subjacent shales 
are also varied with ironstones, and layers and nodules of dark argilla- 
ceous limestone. 
