18 Mr. Phillips on a Group of Slate Rocks 



Feet. 

 Alternations of sandstone and shale with bad coal 100 



Millstone grit, which forms the summit of Ingleborough GO ? 



Alternations of sandstone and shale 100 



{Thin limestone 8 feet"\ 

 Shale . . 10 > 80 



Mural limestone 60 J 



Alternations 120 



Limestone at the foot of the conical parts of these mountains marked") 



by ranges of swallow holes J 



Thick series of shales and sandstones, with thin limestones 150 



Great scar limestone 400 



Slate series of unknown thickness. 



Long- and repeated investigation has shown me that the upper belt of lime- 

 stone in Pendle Hill, Penygent, and Ingleborough, is the main or twelve- 

 fathom limestone of Aldstone Moor and Svvaledale ; that the four-fathom or 

 underset limestone of that district is to be sought at the foot of the conical 

 parts of these mountains, and that the vast scars at their base are formed of 

 the scar, Tyne-bottom, and other lower limestones of Mr. Foster's section. I 

 forbear to enlarge on this subject, because I am not without hopes of preparing 

 a general table of synonyms for the limestone beds over a great part of the 

 north of England. 



Coming on the road from Clapham toward Settle, we see on the left the 

 grand limestone cliffs of Giggleswick in the form of a decided outbreak, and 

 in conformity with common appearances might be led to look on the right of 

 the road for some of the lower formations. Instead of this we find, at the very 

 summit of the road, millstone grit close to and under the limestone scar, and 

 stretching away to an eminence on the right a little lower than the highest 

 point of the limestone*. According to the estimation of thicknesses given 

 above, the dislocation here may be supposed = .510 feet. Perhaps neither of 

 the opposed rocks is here complete, but the errors thus arising are of contrary 

 values. At the edge of the scar the limestone beds " hang" toward the south, 

 but on the top what dip they have is toward Peizer. But the millstone grit 

 dips rapidly away toward the south ; and as it approaches the village of Gig- 

 gleswick changes this declination to S.W., withdraws its craggy edges behind 

 the village, and allows the exposure of the upper belt of limestone in the Ribble 

 at the bridge, and for the length of a quarter of a mile below. The dislocation 

 here would seem to exceed eight hundred feet, unless the scar limestones dip 

 toward the river. 



See Section G, Plate I. 



