DAKYXS: GEOLOGY OF GRASSINGTON AND WENSLEYDALE. 
135 
There is no recognisable bed answering to either the Underset 
or to the Main Limestone, but these beds soon make their appear- 
ance as we go north. The latter forms a plateau at Coverhead, with 
a fine escarpment towards Wharfedale. It has a thin capping of 
chert over which comes the Bearing Grit. 
I will now briefly describe the run of the Millstone Grits. The 
lowest beds, viz., the Grassington Grits, strike west from Grimwith 
Fell towards Grassington ; near this village they turn north and run 
by the mines across Grassington Moor, Black Edge, and Oonistone 
Moor. They are thrown down to the north at Yarnbury by New 
Rake Vein, then up by Beaver Vein, and after several small breaks 
are finally thrown up to the north by the Bycliffe or Black Vein. 
This great vein runs from Bycliffe along Groove Gill, crosses Gateup 
Gill, where the fracture is seen, and thence crossing north of Wig- 
stones it runs down Stony Groove to Merryfield ; and thence into 
the Craven Fault near Pateley Brig. 
This vein is the most northern and greatest in throw of the 
many veins on Grassington Moor ; they seem to be all more or less 
connected with the Craven Fault, with which they make but small 
angles or are roughly parallel. 
The Red Scar Grit occupies the northern part of Appletreewick 
Moor and Hebden Moor. It forms a fine escarpment along the sides 
of Gateup. It is thrown up to the north by the Bycliffe Vein, so as 
to form the escarpment of Rather Standard. At the north end of 
this feature it seems to be thrown up on the west, so that the top of 
the rock which runs up Henless Beck is now found in Meugher Dike. 
This top is well-marked by the tesselated limestone, which is found 
both in Henless Beck and in Meugher Dike. 
The rock forming Sand Haw seems from its position to be part 
of the Red Scar Grit : it is a peculiar rock, being a hard close-grained 
Siliceous Sandstone ; it is somewhat similar to the Red Scar Grit of 
Wolfry Crags, but is quite unlike the general character of that bed. 
It is used for making whetstones, for which purpose it is fetched a 
long way. 
At Hunter Sleets (or Anter Sleets) the section of the Lower Grits 
is as follows : — 
