582 Scientific Proceedings, Royal Dublin Society. 



well, except on the beds, as it is liable to peel and to break at the- 

 joints. Used in the Public Offices, Diocesan Seminary, Foyle 

 College, Gwynn's Institution, Roman Catholic Cathedral, &c. 



Silurian. — The rocks belonging to this formation are of the 

 "Lower Old Eed" type, being reddish and purplish conglome- 

 rates and sandstones. They occur to the west and south-west of 

 Draperstown. They are not a desirable stone. 



Carboniferous. — There are some first-class stones in these 

 rocks, as hereafter mentioned. They have not, however, been as 

 much in demand as they ought to be, on account of the expense of 

 land carriage, which has allowed them to be cut out of the market 

 by stone imported from Scotland. 



These stones range from coarse quartzose conglomerates into 

 fine silicious grits and sandstones of yellowish shades. The latter 

 are easily worked when first quarried, and harden on exposure. 

 They are good for both inside and outside work, and in the old 

 buildings, in which they were very generally used, they exhibit 

 their soundness and durability. 



Gort-a-hurli, near Maghera. — Creamy-white, with subordinate 

 greenish beds ; very silicious, granular, but little cement ; does 

 not work freely. The beautifully and elaborately sculptured door- 

 way of Maghera ancient church, wrought out of this stone, proves 

 its eminent durability. It has been used in Magherafelt. 



Fallagloon and Ranaghan. Three to four miles north-west of 

 Maghera. — Flags, tombstones, door-steps, sills, and scythe-stones 

 procured in different places ; principally worked near the road to 

 the south of Ranaghan. 



Carnanioney (Moyala river). Four miles south-westward of 

 Maghera. — Grey and yellowish, silicious ; easily worked ; used for 

 tombstones, sills, quoins, &c. 



Drumard. Near Draperstown. — Bluish. This stone, some 

 years ago, was opened on by the Grahams of York-street, Belfast, 

 and was considered by Mr. A. P. Sharpe, of Dublin, to be a first- 

 class stone. At that time, however, on account of backward situa- 

 tion, and the great expense of getting the stone from the quarry 

 to the market, the enterprise had to be abandoned. 



At one time the stones from this part of the county were in 

 considerable demand, and were carted to Ballyronan, on Lough 

 Keagh, where they were shipped to Belfast and other places. 



