Kinahan — On Granite and Metamorphic Rock*. 241 



bourhood, the aspect of the village being quite spoilt thereby. 

 Another place where this is well seen is on the road from Kilma- 

 crenan to Dunfanaghy, near Creeslough. 1 



If the planes of foliation in the schist coincide with those of the 

 lamination, and if at the same time the rock is compact, free from 

 many joints, and thin-bedded, it will produce flags. Good thin 

 and thick flags, as mentioned in a former Paper, occur in various 

 places (vol. v., pp. 549 and 619). 



Barnes Lower. N.W. of Kilmacrenan, near the south entrance 

 into Bavnesheg, Ang/ice little Gap. — Purple flags; highly micaceous; 

 from about two to three inches thick ; can be raised of fair sizes. 

 Locally used for flagging, sewer-covers, &c. 



[As these flags abound in the hills to the eastward, they might, be extensively used 

 in the erection of cheap effective and durable farm fences, similar to those that are in use 

 near the Bangor slate quarries, and other places in "Wales. The first cost of such fences 

 would be more than that of those at present in use ; but they would be much more 

 effective and durable.] 



Losset. North of Gartan Lake. — Flags similar to those at 

 Barnes Lower. Used in the neighbourhood, and in Letterkenny 

 and Pathmelton, for kerbing, flags, &c. 



The quarries in the schists are generally small, having been 

 opened merely to procure stones for local uses. Among the 

 quartzytes there are some stones suitable for flagging, and others 

 for heavy work, such as sea-walls and foundations. These have 

 been already mentioned in the description of the Arenaceous Rocks 

 (ante, pp. 549 and 619, vol. v., and ante, p. 12). 



LONDONDERRY. 



Towards the centre of the county, extending north and south 

 from Lough Foyle, to and beyond Dungiven, is a basin of Carbon- 

 iferous rocks. To the westward of this basin, with a few small 

 exposures to the east thereof, are metamorphosed rocks. Those to 

 the northward, coming in from the Co. Donegal, seem to be of 

 Ordovician age, and are not as much altered as those to the south- 



1 In the Co. "Wicklow the 'iron-masked" rocks are locally called, from their ap- 

 pearance, "burnt-rocks," while for a similar reason the hills south of the East Ovoca 

 Mines are called the " Burnt Mountain." 



