Yol. 56.] IGNEOUS ROCKS OF COUNTY WATERFORD. 669 



conglomerates are faulted against the green tuff (as described on a 

 former occasion). 1 On the west side of the faulted inlier of red rocks 

 this ash is again exposed, and is here penetrated by veins of a greenish 

 microlithic felsite, and by a conspicuous vertical dyke of somewhat 

 decomposed pink felsite, 35 to 40 feet thick. A fault then cuts off 

 this green ash from a small but interesting series of bedded greenish 

 felsites charged with epidote and dipping into the cliff at 30° north- 

 westward. From the fact that they are of the same general peno- 

 logical type as the felsites associated with the tuff on the eastern 

 side of the head, it is probable that they belong to the same eruption. 

 The lowest bed is a massive, fine-grained, greenish rock, and it passes 

 up into a kind of nodular variety of the same, consisting of concre- 

 tionary masses, roughly ovoid or subspheroidal, 4 to 8 inches long, 

 and closely packed together, with a whitish shell to each. Above 

 them the rock is of very fine texture, and banded regularly with 

 narrow pale bands, g to | inch wide, resembling the material that 

 forms the shells of the spheroids. This banded zone is 3 feet thick ; 

 above it comes a massive green felsite, similar microscopically to 

 that at the base of the series, and containing obscure traces cf the 

 spheroids in its lower portions. 



Cooneenacartan Cove. — Leaving now this cove by Bunmahon 

 Head, we find an exposure of felsitic rocks in Cooneenacartan Cove, 

 about 300 yards east of Ballydouane Bay. A greenish felsite forms 

 most of the eastern side, associated with another closely similar 

 felsite, but showing coarse flow-brecciation. At the head of the 

 cove is a coarse greenish ash, containing fragments of green felsite, 

 'greenstones/ and pink felsite, and bursting through it are 

 several irregular protrusions of purplish and dark-greyish felsites. 

 These felsites appear to be later than the dark-greenish rocks of 

 peculiar character found in this cove (see p. 677), and are of a 

 trachytic type (see § III, Petrological Notes, p. 683). 



Ballydouane. — On the eastern side of Ballydouane Bay a 

 dark irregular vein of felsite of considerable width traverses all the 

 rocks except the red sandstones and conglomerates. In the second 

 small cove west of this Bay is the remnant of an old volcanic neck, 

 filled with a coarse felsitic agglomerate and with fragments of the 

 banded calcareous rocks. The neck measures about 16 feet in dia- 

 meter, at the base of the cliff. Intimately associated with it is a 

 felsite of coarse nodular structure. A pipe of light-greyish felsitic 

 tuff associated with other felsites, but all much traversed by faults, 

 occurs beneath the patch of red rocks in Ballydouane West Bay as 

 described on a previous occasion 2 . All the rest of this bay is 

 bounded by cliffs of greenish felsite, associated with a greenish tuff 

 of similar materials, and traversed by dykes and veins of dark-green 

 felsite of similar type ; while high up in the cliffs a vein of bright 

 pink felspar-porphyry, several feet wide, cuts through the other 



1 Quart. Journ. Geol. Soc. vol. liii (1897) pp. 279-80 & figs. 6-7. 



2 Ibid. p. 273 & fig. 1. 



