94 Scientific Proceedings, Royal Dublin Society. 



Westward of Wooden Bridge, both north and sonth of the 

 Darragh Water, or Aughrim River, there is a vein easily wrought 

 into large slabs. This has been worked a little for tombstones. 



In the southern part of the county, a little north of Carnew, are 

 the Kilcavan slate quarries. Here the veins are peculiar, as they 

 swell out and contract suddenly ; while in the vein a mass of grit 

 may appear cutting out the slate. The slate is of a dark colour 

 and fair quality ; but the quarry has been greatly injured by 

 allowing the rubbish to accumulate in it, and at its mouth ; and 

 now before it could be worked this would have to be cleared away 

 at considerable expense. 



About two miles from Eathdrum there is a slaty flag that has 

 been used in the town. 



Lewis mentions " quarries of good slate at Crehelp, three or 

 four miles east of Dunlavin, and a slate quarry, opened about the 

 year 1830, at Gibbet Hill, near Clonegal. 



SLATES USED AS BUILDING-STONE. 

 ANTRIM. 



In the north-east of this county there is a small tract of more 

 or less metamorphosed rocks, probably the equivalents of either 

 the Ordovician or Arenig. The schists and slates are locally used 

 for common walling purposes. 



ARMAGH. 



In Armagh, extending north-eastward and south-westward into 

 the adjoining counties of Down and Monaghan, respectively, is a 

 large area occupied by Ordovician rocks, in which slates largely 

 occur. Here, as in the rest of these Ordovicians, they are the 

 general building- stone of the country, being preferred to the asso- 

 ciated grits ; but they are not suited for cut-stone purposes. At 

 Carricklane there is a quarry of good stone that was used for walling 

 in the building of (rosford Castle. 



CARLOW. 



The slate rocks of this county are of very little importance. 

 Ordovicians occur only in the south-east of the county in the neigh- 



