308 Mr. Horner on the Mineralogy of the Malvern Hills. 



is N. and S. and they dip W. at an angle of about 40'. At the 

 point where these strata crop out, they are very much broken, and 

 irregular in their position ; in one place I observed the ends of the 

 strata turned completely up into a vertical position, as is represented 

 in the sketch No. 2. This appearance is however only of partial 

 occurrence, for in returning a few days afterwards to the same place, 

 the quarriers had removed that part of the rock, and at the cropping 

 out of the strata then exposed, although they were irregular, they 

 were not in a vertical position. In Chamberlain's quarry, to the 

 north of Pearly Quarry, I also observed the limestone strata becom- 

 ing more inclined and as it were bent up, towards the point where 

 they crop out at the surface. 



§ 54. In the limestone of Pearly Quarry, I obtained a specimen 

 of the vertebra of an encrinite, and which, as I am informed by Mr, 

 Parkinson, is one of a very rare species : the only other specimen of 

 it which he has seen is in the British Museum. 



§ 55. To the westward of Pearly Quarry the argillaceous rock is 

 found in conformable stratification with the limestone. It has some- 

 what of a slaty structure, and includes balls of argillaceous limestone. 

 A road that is cut through this rock exhibits a section of it at right 

 angles to the bearing of the strata : it is of very considerable thick- 

 ness, as the section is about a quarter of a mile in extent, and the same 

 rock continues the whole way. On this there lies a fine quartzose 

 sandstone in thin strata, dipping W. at an angle of 42% and bearing 

 N. and S. The quartzose sand is united by a calcareo-argillaceous 

 cement with a few spangles of mica disseminated through the mass. 

 In those places where the mica is most abundant, it acquires a slaty 

 structure, and the slates may sometimes be obtained as thin as coarse 

 paper. The colour of the rock, which is derived from a consider- 

 able admixture of oxide of iron, is in general yellowish-brown : it 



