Kinahan — On Granite and Metamorphic Rocks. 211 



quartzyte, while higher up are some intrudes or interbedded eurytes. 

 But the greatest development of the exotic rocks are intruded 

 and interbedded whinstones, eurytes, and felstones ( ?) , with associated 

 agglomerates and other tuffs at the junction of the Calp and 

 Fenestella Limestones, a second being higher up, partly below, 

 and possibly also in the Coal-Measures, as hereinafter mentioned. 

 Below the lower zone there are isolated intrudes or protrudes, 

 usually elvans, but in some places felstones, whinstones, or even 

 agglomerates. 



There seems to be no evidence of the later exotic rocks in this 

 territory, except, perhaps, some of the dykes in the Carboniferous 

 Slate, Co. Cork, which may possibly be of tertiary age. 



Territorial Description. 

 CLARE, TIPPERARY, AND LIMERICK. 



In places at the base of the Lower Carboniferous Sandstone, 

 especially in the neighbourhood of Lough Graney, there is a 

 peculiar quartz-rock, the basal rock of the formation. This rock, 

 when well developed, is very pure, and seems to have been de- 

 posited from solution on the floor of the Carboniferous sea. This, 

 in places, is replaced by a peculiar limestone. This quartz-rock 

 has not been in any way utilized ; yet it seems capable of being 

 used as a substitute for flint in the glass and china trades. 



In the Carboniferous Limestone of Clare there is a tuff at 

 Meelick, a few miles north of the Shannon, while in Co. Limerick 

 the exotic rocks are largely developed. In part surrounding and 

 margining the Ballybrood Coal- Measures there are whinstones with 

 their associated tuffs ; and extending from them into the Coal- 

 measures is a long whinstone mass, which may possibly have been 

 intruded into the latter ; but more probably it is a protrude, that 

 is, a high rib, against and on which the Coal- Measures accu- 

 mulated. 



Outside, forming an oval ring, at the juncture of the Calp and 

 the Fenestella Limestone, there are interbedded whinstones, eurytes 

 felstones (?), and tuffs, with, in places, intrudes partly allied to 

 elvan. The tuffs range from a fine rock, often calcareous, to con- 

 glomerates and massive irregular agglomerates. 



