276 GEOLOGICAL EELATI02fS OP THE ROCKS OP THE SOUTH OF IRELAND. 



Mr. Jfkes-Browne said that, as he understood, the conglomerate 

 at the base of the Irish Carboniferous series was confined to one 

 horizon; but on Prof. Hull's theory every bed ought to become con- 

 glomeratic as it approached the land. Had Prof. Hull considered 

 that point ? 



The Presidejs^t said that he wished to make a few remarks on the 

 excellent paper which they had heard. The Foreland rocks were 

 different from any thing to the south of them. Eesting upon these 

 grits occur the Lynton slates, with many Brachiopods ; then the 

 Hangman grits ; then the Ilfracombe series, with corals in limestone 

 bands, like those of Torquaj^ ; then the Morte slates, above which, 

 in due succession, occur the Pickwell-Down, and the Marwood, Pilton, 

 and Barnstaple beds. These last he paralleled with the Coomhola 

 grits in Ireland. He felt convinced that the Poreland beds could 

 not be the same as the Hangman grits. Prof. Hull, he thought, 

 had shown conclusively that in Ireland there was a great hiatus 

 between the Pickwell-Down and the Lynton beds, or the Middle 

 and Lower Devonian. The structure of North Devon is repeated in 

 South Devon. 



The Author, in reply, expressed his gratification at the way in 

 which his paper had been received. He could not admit that the 

 Foreland grits and slates were possible equivalents of the Hangman 

 grits repeated by a fault, their characters and position being dif- 

 ferent; on the other hand, their resemblance to the Glengariff 

 beds was most striking. The point to which Mr. Jukes-Browne had 

 called attention was difiicult of explanation. He reminded Pro- 

 fessor Ramsay that, in his previous paper, he had endeavoured to 

 prove the Upper-Silurian age of the Glengariff beds, not only from 

 their conformable position to the fossiliferous Upper Silurian on the 

 coast of Dingle, but from their supposed representation by the un- 

 doubted Upper Silurian grits and slates of Muilrea in West Mayo, 

 on the banks of Killary harbour. If this were so, he considered the 

 name of "Lower Old Eed Sandstone" for equivalent lacustrine 

 beds in Scotland would be untenable ; and he suggested instead of 

 " Old Eed Sandstone," as applied to the Herefordshire " Cornstone 

 Group," the name of " Estuarine Devonian." He was glad to hear 

 Mr. Champernowne's correlation of the beds of North and South 

 Devon. 



