Kinahan — On Granite and Metamorphie Rocks. 215 



In the Carboniferous Slate of the south and west parts of Bear 

 Island, and thence eastward on the mainland along the north shore 

 of Bantiy Bay to White Ball and Black Ball Heads, there are 

 numerous intrudes, and in places, apparently interbedded sheets of 

 felstones and tuffs, with later intrudes of whinstones. To the 

 northward there are felstones and tuffs, which seem for the most 

 part, interbedded ; higher up are some apparently bedded whin- 

 stones, while more southward, both on the island and mainland, are 

 evident intrudes of whinstone ; some of these are perpendicular 

 dykes that overflowed, forming a cake on the present surface of the 

 ground. This may possibly indicate that these whinstones are 

 much newer than the other rocks of the country, and perhaps of 

 Triassic or even Tertiary age. 



In the Carboniferous Slate, near Black Ball Head, there is a 

 small mass of agglomerate connected downwards with dykes of 

 agglomerate, which come up through the Devonian and Yellow 

 Sandstone ; while extending eastward from the mass are felstones 

 and whinstones, which appear to be interbedded with the associated 

 grits and shales. 



The exotic rocks of this area do not seem to be utilized, except 

 very sparingly, although some appear suitable for paving-setts, 

 kerbs, &c. 



In the Glen gar iff grits, about five miles S.S.W. of Mallow, there 

 is a boss of agglomerate ; while in the Carboniferous limestone, three 

 miles east of Kanturk, there is another larger one. The latter 

 appears to be on about the same geological horizon as the before- 

 mentioned zone in the Co. Limerick. 



NORTH-WEST AND NORTH IRELAND. 



[Galway, Mayo, Sligo, Roscommon, and Leitrim, in CONN AUGHT ; and Fermanagh, 

 Donegal, Tyrone, Londonderry, and Antrim, in ULSTER.] 



Chronological Account. 



It appears evident that at one time the greater part of this 

 territory was a continuous tract of more or less metamorphie and 

 granitic rocks ; but it is now partially covered by masses of later 

 rock, which, after deposition, have suffered considerable denu- 



