224 J. R. Dakyns — Millstone Orit of Grassington. 



Yoredale Series, we have here a well-marked and natural divisioct 

 between the Yoredale Beds and the Millstone Grit. 



The Bearing Grit is so called because the lead veins are very rich 

 in this bed. 



A tolerably persistent coal, ranging up to ten inches in thickness, 

 occurs in the overlying shales, and a coal up to six inches thick lies 

 on or near to the Top Grit. 



The sandstone of Priest Tarn probably corresponds to a bed which 

 further north forms Pinlow Pike, and is in Coverdale, though thin, 

 very persistent and of a well-marked character, being a hard 

 siliceous rock. 



The next important rock is the bed we call the Eedscar Grit. It 

 is a coarse felspathic grit of a very red tinge, which is apt to form 

 such conspicuous red scars that it can be recognized miles off. Thi& 

 rock, like the Grassington group, often consists of two members 

 parted by a shale band containing a coal-seam, and it thus forms 

 a double feature. In this part of the country it generally has on, 

 or near its top a thin bed of peculiar limestone that has the appearance 

 of a tesselated pavement. This tesselated limestone forms a very 

 good horizon as the top of the rock, which we correlate with the top 

 of the Kinder Scout Grits. 



The next important rock is that which forms Henstone Band. 

 We correlate it with the lower grit of Follifoot Kidge. 



I will now briefly describe the run of the principal beds. Im- 

 mediately north of the Craven Fault the Lower Millstone Grits strike 

 west from Bewerley across Grimwith Fell towards Grassington. 

 Near this village they turn north and run by the mines across 

 Grassington Moor, Black Edge, and Coniston Moor. They are thrown 

 down to the north of Yarnbury by the New Eake Vein, then up by 

 Beaver Vein, and after several small breaks are finally thrown up 

 on the north by the B;}clifife or Black Vein. 



This great vein runs from Bycliflfe along Groove Gill, crosses 

 Gateup Gill, where the fracture is seen, and thence crossing north of 

 Wigstones it runs down Stony Groove to Merrifield, and thence 

 into the Craven Fault near Pateley Brig. This vein is the most 

 northerly and greatest in throw of the many veins on Grassington 

 Moor. They seem all to be more or less connected with the Craven 

 Fault, to which they are roughly parallel or with which they make 

 small angles. 



The Eedscar Grit occupies the northern part of Appletreewick 

 Moor and Hebden Moor. It forms a fine escarpment along the sides 

 of Gateup Gill. It is thrown up to the north by the Bycliffe Vein 

 so as to form the escarpment of Eather Standard, at the north end 

 of which it is 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 

 in place in Henless Beck and in Meugher Dike. 



The rock forming Sand Haw seems from its position to be part of 

 the Eedscar Grit. It is a peculiar rock, being hard, close-grained, 

 and siliceous, and is used for making whetstones, for which purpose 



