Kinahan — On Granite and Metamorphic Rocks. 253 



depth to which it weathers, no attempt has been made to open 

 quarries in it. " It is highly porphyritic, of a pale pinkish colour, 

 and appears to be a very beautiful stone," as seen in the cuttings 

 for the Newry and Grreenore Railway. He therefore is of 

 opinion " that good quarries might be opened with advantageous 

 results." 



The Mourne Mountain granite at the margins of the intrude 

 usually becomes an elvan. To the north-east, near Newcastle, 

 it has been quarried for use in that town. Usually it is even- 

 grained, pink mottled grey, and much coarser than the other 

 granites of the Territory. 



In the southern part of the county Louth, in the Ordovicians, there 

 are numerous beds, dykes, and other intrudes of whin stone and 

 euryte, as also beds of tuff more or less similar to those already men- 

 tioned in the Co. Wexford ; they do not seem to be much utilized 

 except for local purposes. Some of them, however, appear suitable 

 for paving-setts. 



These are very numerous along the coast section in the neigh- 

 bourhood of Clogher Head, while inland they appear about Collon, 

 S.W. of Dunleer, coming in from the Co. Meath. 



MONAGHAN, CAVAN, LONGFORD, WESTMEATH, AND 



MEATH. 



West of Bellananagh and S.W. of Cavan there is a limited 

 tract of fine-grained grey and reddish granite, which is described 

 as metamorphic and post- Ordoviciam. "The granite is generally 

 broken up by irregular jointing, and thus can be but little used for 

 building purposes." (g. s. m.) 



A few felstone dykes have been noted in the vicinity of the 

 granite. 



In the Co. Meath there are whinstones S.E. and S. of Kings- 

 court, coming up respectively through the Coal-measures and the 

 Triassic. To the N.E. of Navan, and at Sfane, and to the S.W.E. 

 and N.E. thereof, extending into Co. Louth there are in the Or- 

 dovicians numerous long exposures of whinstone, felstone, and tuff 

 locally utilized. 



