386 ON THE AGE OF THE CANNINGTON PIRK LIMESTONE. 



Limestone in parts is oolitic in structure, and is identical in 

 ctaracter with that developed in the neighbourhood of Bristol. It 

 undoubtedly belongs to the Upper Carboniferous Limestone." 

 With this conclusion we certainly agree and as the determinations 

 may be relied on, it almost renders any further discussion un- 

 necessary. 



From our own cursory observation of the limestone we have 

 obtained in situ an undoubted specimen of Lithostrotion irregulare, 

 which is quite conclusive as to the age ; several specimens of 

 solitary corals were seen in the rock, poorly preserved, and which 

 we could not identify specially. Of shells we found several 

 crushed specimens, perhaps Terehratula hastata or possibly an 

 Athyris, also a small Produda elegans or young P. punctata. 



"We are indebted to our companion, the Rev. H. Win wood, for an 

 example of what looks like Atrypa reticularis, but we are unable to 

 say whether it be really such ; ^also for a portion of stem of 

 Actinocrinus. 



We follow Messrs. Bristow, Woodward and Perceval in 

 recognising a lithological resemblance to the Carboniferous 

 Limestone of the Mendips both in colour, structure, mode of 

 weathering, jointing, &c., it mainly resembles the Carboniferous 

 Limestone. 



The joints are numerous and persistent ; the main joints have 

 a N. & S. direction. In the large quarry, at the S. E. end of the 

 hill, and indeed generally the dip is rather obscure. At one end of 

 the quarry, where we found the corals, the dip is plainly to the 

 S. W., at an angle of about 30°, but at the other side of the same 

 quarry the beds seem to arch over and the quarrymen pointed out 

 to us that near the floor in this part they dip steeply in the opposite 

 direction. The mass is therefore part of a dome or fold. 



The limestone is intersected by many strings and veins of 

 Triassic age ; some filled by a red breccia bounded by a lining of 

 white calc-spar ; the Trias breccia of the veins contains pieces of 

 limestone, the whole most firmly cemented together. These veins 

 contain red sulphate of Barium, (the Barytes was noticed by 



