866 Mr. Horner on the Geology of the 



limestone, but to be interposed between two vertical masses. The 

 barytes contains copper pyrites and green oxide of copper, and in 

 the limestone near the vein I found quartz crystals scattered through 

 the mass, giving it an appearance like a porphyry. I also observed 

 in some places traces of carbonate of copper in the limestone. 



§ 32. In going over the top of the hill (which is very much 

 covered by vegetation) the ends of the strata appear above the grass 

 in many places in a vertical position, and running between north- 

 east and south-west, but on coming to the quarries where the rock 

 Is extensively exposed, I found that although it is evidently stratified, 

 it is so shattered and so crossed by rents in every direction, that it 

 was impossible for me to discover what were the true planes of stra- 

 tification, the internal structure of the stone affording no indication. 

 Judging however from the more general direction of the masses, I 

 think they may be said to be either for the most part vertical, or at 

 least very highly inclined and running between north and south. I 

 did not discover the least appearance of slate or any circumstance 

 that could connect this limestone with the subordinate beds in the 

 grauwacke series of the neighbouring hills, except its proximity to 

 them. It more nearly resembles the Plymouth limestone than any 

 other I am acquainted with, and although that has been found to 

 contain both madrepores and shells, there are great portions of it 

 where no traces of organized bodies can be discovered. It is also 

 very probable that by a more minute examination they may be 

 found in the limestone of Cannington Park, for it has certainly 

 very much the appearance of what is called a transition limestone, 

 and there are laminas of calcareous spar dispersed through it, which 

 are strong indications of organic remains. It produces a very pure 

 white lime, which is carried to a great distance. 



§ 33. From the termination of the marsh land which lies to 



