136 DAKVNS: GEOLOGY OF GRASSINGTON AND WENSLEYDALE. 
Fths. 
Yds. 
8 
Ft, 
Ins. 
Grit 
Plate 
Coal 
Shale 
Grit 
Plate 
Coal 
about 20 — 
about 3 — 
1 
1 
6 
5 to 10 
Soapy Grit 
2 or 3 
Main Limestone ... — — — — 
Further north, the Lower Coal lies on the Cherty top of the 
Limestone. 
Above the Grassington Grits we have, under Whernside, some- 
thing like 170 feet of Shales and Sandstone; then a thin Siliceous 
Grit at Pinlow Pike; another 140 feet of Shales and Sandstone takes 
us to the base of the Red Sear Grit. This Grit is here about 90 feet 
thick. Above it we have 1G0 feet of Grits 'and Shales extending 
up to the base of the Whernside Grit. This grit, which forms the 
summit of Great Whernside. has generally a base of flagstone; the 
upper part of this rock is a siliceous " Homerstone Grit. " Homer- 
stone " is a local term applied to a grit that contains large pebbles 
of quartz. The Whernside Grit, which is supposed to be the same 
as the Lower Follifoot Grit, is the highest Millstone Grit known 
anywhere in Upper Wharfedale. The part of the country including 
Great Whernside and Coverhead is illustrated by one of the 
Geological Survey's Sheets of Horizontal Sections. In the upper 
part of Coverdale there are four Limestones cropping out, viz., 
the Main and Middle Limestones, and between them two other lime- 
stones. Of these latter the lowest is the limestone which occurs at 
Walden Head, above Fairy Scar (see below), and passes down Walden 
into sandstone. The limestone next above it is probably the Under- 
set. Over it come irony shales, and over them the Main Limestone. 
This bed, as was long ago pointed out by Phillips, is thicker on the 
north-west side of Coverdale than it is on the south-east. The 
following is a general table of the strata at Coverhead, and hard by, 
the beds below the top of the limestones only appearing in Wharfe- 
dale : — 
