144 DAKYNS: GEOLOGY OF GRASSINGTON AND WENSLEYDALE, 
Shales : sandy micaceous ; concretionary and jointed, bluisli in 
colour. 
2. Sandstone : calcareous ; dies out or thins eastward. 
Shale. 
1. Sandstone : calcareous ; dies out or thins eastward. 
On the zigzag road leading to the top of the hill, east of Black 
Scar, the beds are well shown. No. 3 is a flaggy micaceous 
sandstone. In the overlying shales a sandy band occurs from 
which water issues, and sinks in No. 3. 
The topmost grit is the Red Scar Grit. Ganister is found 
above it. 
In the above paper, taken in conjunction with the previous one, 
I have endeavoured to describe, without going into minute details, 
the chief changes which the rocks undergo from south to north. 
These may be summed up as follows : — 
1. The Yoredale type of beds can hardly be said to exist south of 
Kettlewell. From Grassington northwards the Carboniferous 
Limestone becomes split up with beds of sandstone and shale : 
and north of Kettlewell important rocks, to wit the Underset 
and Main Limestones, set in ; so that finally we have in Yore- 
dale the well-known type of beds that goes by that name. 
2. In the southern part of its course the Main Limestone is imme- 
diately overlaid by the Millstone Grit ; but northwards a 
set of cherty beds comes in between the pure limestone and 
the grit ; at first, as at Coverhead, this is merely a thin cherty 
top to the limestone, but this gradually develops into a series 
of cherty beds, sandstones, and shales. 
3. Owing to the deterioration of the lowest Millstone Grit in Cover- 
dale and on the slopes of Penhill, it is somewhat uncertain 
what line further north should be taken as the Millstone Grit 
base. I have suggested the top of the Little Limestone so as 
to keep on one horizon. 
4. It is important to notice that the siliceous grits and ganister-like 
rocks that occur in the Millstone Grit Series above the Kinder- 
scout Grits, become more pronounced northward, so that at 
length they are regular ganister measures, similar to the 
ganister measures of the lower part of the coal measures, 
