KiNAHAN AND Baily — Report on Roclis, S^'c. 489 



not to be exposed in the counties of Cork or Kerry ^ ; but in tlie Com- 

 meragb Mountains, Co. Waterford, there are conglomerates and other 

 rocks which the late Mr. John Kelly believed to be of similar age to 

 those of Toormakeady ; and if this classification is correct, they must 

 be of Silurian age. To us it seems highly probable that they are the 

 littoral accumulations of the Cork rocks. These Commeragh rocks rest 

 unconformably on Cambro-Silurians. 



After this sketch of the Irish Silurians, including under that name 

 the rocks called "Lower Old Eed Sandstone," there are more de- 

 tailed illustrations of the rocks of the Fintona, the Curlew Mountain, 

 and the other, districts. 



In the Fintona district the general section in a S.S."W. line, from 

 the rocks of the " Pomeroy series " to the flanks of the Altmore hills, 

 gives rocks in the following order : — 



AgJiafad and Lurgylea Section. 



4. Flaggy eurite. 



3. Space without any rock exposure. 



2. Purplish sandstones, flags, and sandy shales. 



1 . Greenish and purplish sandstones, flags, and sandy shales. 



The eurites (I^o. 4) resemble compact basic purple felstones, but 

 they are in general full of divisional planes like stratification, which 

 are rarely two feet apart, and usually less than one foot, while in 

 places they are so close together as to give the rock the aspect of a 

 shale ; but in the quarry lately opened at the Dungannon Water- 

 works, in the Altmore river valley, there is a massive eurite, which 

 seems to be at or near one of the centres of eruption. 



In the Aghafad and Lurgylea section the rocks east of, or below, 

 the eurite (No. 4) cannot be seen ; this space (No. 3) is probably occu- 

 pied by rocks let down by faults and having a reversed dip, because a 

 mile and a half to the E.S.E., in Grlenbeg, eurites and tuffs occur dip- 

 ping to the jST.E. and E.S.E., apparently in the foUowiag order: — 



Glenheff Section (PI. XYI., fig. 3). 



6. TeUowtuff. 



5. Green, purple, and prismoid eurite (only the weathered outcrop 



seen). 



4. Yellow steatitic tuff. 



3. Green and purple tuff. 



2. Elaggy eurite. 



1. Sandstone. 



^ Mr. M 'Henry appears to be of the opinion that some of the rocks in the 

 Co. Kerry classed as Silurian ought more properly to be classed as Cambro- 

 Silui'ian, they being the equivalents of the rocks of the "Pomeroy series." 



