Tol. 56.] IGNEOUS ROCKS OF COUNTY WATERFORD. 661 



faults dislocate the beds in this section, and a vein of later intrusive 

 purplish felsite with glassy margin cuts across them. 



Beds of similar character on the strike of these occur inland near 

 the boundary of Garrarus townland. A smaller exposure of bedded 

 volcanic rocks occurs in Lady's Cove, with several thin bands of 

 greenish perlitic felsites ; as also a further development of greenish 

 and pink felsites with the usual coarse tuff. A tongue of later 

 greyish spherulitic felsite cuts through the bedded pink felsites, 

 which are considerably disturbed by faults ; and a wedge of dark- 

 green perlitic felsite is also let into the midst of the pink felsites 

 by faults. The western point of the cove is formed by a beautiful 

 pink felsite with conspicuous wavy lines of flow, and this rock 

 extends to the eastern end of Garrarus Strand (fig. 3, p. 662), where 

 the greenish tuff and agglomerate (here of extreme coarseness, and 

 containing blocks of pink felsite 2 feet or more in length) set 

 in. The almost complete absence of chips of black slate is here 

 noticeable. Greenish and pinkish felsites of the same type as those 

 in Lady's Cove adjoining are associated here with these agglome- 

 rates, and apparently overlie them. The face of the cliffs is, however, 

 considerably obscured by slipped material, and no continuous clear 

 section is visible. But nearer the middle of Garrarus Strand the 

 rocks of these types suddenly cease, and unbedded felsites of a greyish 

 colour and different microscopic character set in (Analysis No. V, 

 p. 679). Their chief feature is, however, the inclusion (fig. 4, p. 662) 

 of large irregular strips and masses of black slate. The relations 

 of these grey felsites to the pinkish felsites and tuffs is not dis- 

 tinctly seen ; but it may be either a line of fault or a plane of 

 intrusion, probably the latter. The large slabs and blocks of black 

 slate, often several square yards in area, in the midst of these grey 

 felsites give a marked character to this part of Garrarus Strand. 



But these felsites are not all of exactly the same type : some more- 

 over show signs of crushing, and more than one fault shifts them. 

 Their late intrusion appears to be indicated by the inclusion of a 

 mass of diabase which had previously been intruded into the black 

 slates ; for everywhere along the coast the diabase-intrusions seem 

 to have been one of the latest manifestations of igneous energy. On 

 the farther side of the western stream similar pale greenish-grey, 

 imbedded felsites, containing small xenoliths, and perhaps belonging 

 to the same set of intrusions, are exposed. 



West of the central promontory, marked ' 125 ' on the 6-inch 

 Ordnance-Survey map, in the middle of Garrarus Strand, intricate 

 and confused sections in the cliffs are seen showing numerous 

 irregular tongues of the cryptocrystalline greenish felsite branching 

 off from the main mass, and piercing the black slates. A dyke of a 

 light-grey horny felsite of microcrystalline structure is also exposed. 



Another rock (fig. 5, p. 662), which here requires mention, forms 

 a low boss at the foot of the cliffs, consisting of a peculiar type of 

 felsite-porphyry, and apparently later than the main mass of felsites, 

 though it is pierced like them by small veins of greyish opaque 

 trachyte. 



