250 Scientific Proceedings, Royal Dublin Society. 



DOWN, LOUTH, AND ARMAGH. 



In the northern part of the Co. Down, near Comber and New- 

 townards, there are intrudes of whinstone in the Triassic rocks; 

 these are principally used for road metal. 



In the neighbourhood of Lurgan and Portadown, counties 

 Down and Armagh, there is the southern extremity of the great 

 Ulster sheets of Eocene doleryte and basalt; while at Market- 

 hill and Poyntzpass there are some small intrusions of the 

 same. 



Dykes of whinstone, eury te, and felstone, are very numerous in 

 the Ordovician, especially in the eastern coast section and in the 

 hills. Many of these, as already mentioned, are cut off by the 

 intrude of the granite of the Mourne district ; but some seem to 

 be adjuncts of that granite, while others are probably of Tertiary 



" The mountains around Carlingford Lough yield a good series 

 of granites, all nearly of the same colour, but differing in texture ; 

 the finest being from Castlewellan, and the most open, or spotted 

 from Goragh Wood and Bessbrook. Stones of any size can be had 

 from Castlewellan, and good stone for all purposes from any of the 

 quarries." (W. Gray.) 



Bessbrook Granite Company, Co. Armagh. (Thos. Flynn.) 



Five different qualities of granite : — 



No. 1. — Bright-grey, spotted; probably the root rocks of the 

 younger exotic rocks of the district, and allied to the nevadyte of 

 the continental geologists ; a very handsome stone ; polishes 

 well. 



No. 2. — Bright-grey, fine-grained, very hard, durable ; the 

 typical Newry or Slieve Croob granite ; here it is very hard, and 

 eminently suitable for paving-setts, which have been supplied to the 

 Tramway Companies of Wigan, Bristol, Chester, Southport, 

 Newtown Heath (Manchester), Edinburgh, Chesterfield, St. Helen's, 

 Swansea; and to the Corporations of Liverpool, Huddersfield, 

 Preston, Chester, Salford, &c. Setts, 4" cubes, 3" x 6", 4" x 6" 

 3" x 5", 4" x 5" and 4" x 7" ; special sizes if required. 



