Kinahan — On Irish Arenaceous Rocks. 561 



some are yellowish, or variegated. In many of them there are 

 argillaceous or shale spots and specks. At Lisbellaw, in connexion 

 with the exposure of Ordovicians, a massive conglomerate abruptly 

 comes in, as if it had been a shingle mass against a head, that 

 acted as a groyne at the end of an ancient strand. The pebbles in 

 it are remarkably hard, and are much used for road metal. The 

 •evident circumstances under which the " Lisbellaw conglomerate" 

 accumulated have been given in a Paper on this subject (page 504, 

 ante). 



These Silurian sandstones are in general too coarse for dressed 

 work, though well adapted for ordinary or coarse work. The finer 

 kind was extensively used in Necarn Castle, near Irvine — or 

 Lowtherstown — the dressing being the Oalp sandstone from Lis- 

 naskea. At Castle Archdall, however, in the same neighbourhood, 

 it was used for the quoins and dressing, while the walling is an 

 impure limestone. 



In Ardlogher Quarry, near Irvinestown, the stone varies, being 

 shades of reddish-grey. It is granular, semi-crystalline, hard, 

 compact, and slightly calcareous. Lower beds mahogany-red to 

 red ; argillaceous ; laminated and micaceous ; works fairly well. 



Mullaghfarm. Four miles from Irvinestown. — Brittle and hard 

 to work ; used for quoins and common dressing. 



Kerlish. Eleven miles from Irvinestown. — Various ; generally 

 coarse, conglomeritic, quartz- grain, felspathic cement, and slightly 

 ferriferous ; others finer in texture. 



Carboniferous. — In the disputed area of Slievebeagh dis- 

 trict, here described as Fermanagh sandstone, there are some 

 noted quarries. In the neighbourhood of Lisnaskea most of the 

 stones are creamy, yellowish, or slightly greyish, good, free- 

 working, and have been extensively used in Lisnaskea, besides 

 other places in this and the neighbouring counties, such as Irvines- 

 town, Enniskillen, Clones, Monaghan, and Newtownbutler. They 

 do not, however, seem to have gone into the Dublin or other 

 distant markets, although some of them are well worthy of notice. 

 Stones from these quarries were used as quoins and dressing at 

 Crom Castle, and at Necarn, near Irvinestown, for ornamental 

 work. 



Tannyby. Near Lisnaskea. — Yellowish-white to reddish-grey ; 

 £nely silicious-grained ; felspathic cement ; ferriferous spots ; free- 



