DAKYNS: GEOLOGY OF GRASSINGTON AND WE N SLE YDALE . 143 
The lowest Millstone Grit or the Grit of Grassington Moor con- 
tinues in force as a massive coarse grit all down Walden, but on 
Burton Moor it has the form of a massive well-jointed sandstone, and 
then rapidly deteriorates northwards into a mass of sandstones and 
shales. The sandstones however forms excellent flags, for which 
purpose they are extensively quarried on the northern face of Penhill. 
The following parallel sections represent the beds on the south- 
west and north sides of Penhill ; and the Millstone Grit portions of 
these sections may be superposed over the section given above to get 
a complete series from West Witton to the summit of Penhill. 
North Side. South-west Side. 
Ft. 
Ft. 
Coarse Grit = Red Scar Grit... 
75 seen 
75 seen 
Thin Shale 
10 
10 
Massive Sandstone ... 
40 
30 
Shale 
95 
85 
Sandstone 
10 
20 
Shale 
20 
10 
Sandstone 
20 
30 
Shale 
20 
40 
Sandstone 
20) The 
Shale 
30VGrassington 
>140 
Sandstone 
50) Grits 
Shale 
60 
20 
Cherty Beds ... ... 80) The Main ) 
White Limestone ... ... 70C Limestone f 
Black Scar, on Penhill, formed of the topmost beds of the above 
section, gives the following sequence of rocks : — 
5. Coarse felspathic grit forms the summit plateau, with ganister 
lying about. 
Thin shale. 
4. Massive sandstone : very variable ; in places calcareous ; dies 
out eastward. 
Shale : sandy micaceous and blue. 
3. Sandstone : calcareous ; seen on the road at the east end of 
Black Scar, about 50 yards from the elbow, just above the 
1,500 contour line ; it runs to the spring on the east side of 
the road. 
