14 Mr. Weaver on the Geological Relations of the South of Ireland. 



of concretion. In places, the compact greenstone merges into quartz-rock, deeply coloured by 

 chlorite. 



Red Sandstone Conglomerate, and Greenstone Conglomerate. — When the red sandstone and the 

 greenstone beds come in contact, a gradation may be traced in some places from the one rock to 

 the other, through the medium of a conglomerate, the extreme links of the chain being the follow- 

 ing : 1. A basis of fine-grained red sandstone, enveloping rounded and angular fragments of red 

 conglomerate and sandstone, and of greenstone, the two former exceeding the latter in quantity. 

 2. A base of compact greenstone, inclosing rounded and angular fragments of greenstone, and of 

 red sandstone, the former predominating. In both conglomerates, the included fragments occur 

 from a small size to that of a child's head. 



The crystals noticed in the preceding varieties of clayslate, quartz-rock, hornstone, greenstone, 

 and compact felspar, appear to be of contemporaneous formation with the rock itself, possessing 

 angles sharp and well defined. 



(16.) The rocks thus described form beds intimately connected with each 

 other by direct association, gradations, and repeated alternations, but without 

 any specific order of succession or continuity. Their range is east and west 

 yet subject to inflections from the line, while the dip changes from the 

 north to the south, the beds being commonly at an angle approaching the 

 vertical ; but in the most eastern part of this coast, trending toward Tramore 

 bay, they are inflected to a much greater extent, and partially disposed at a 

 low angle of inclination. 



Between the river Bonmahon and the bay of Ballydoan situated two miles 

 west, there are fewer varieties of rock exhibited than occur more west and 

 north of that bay. In the bay itself, the immediate association of the red 

 sandstone and greenstone beds is well exemplified, in double alternation ; and 

 in the line of contact between the two rocks may be observed those gradua- 

 tions from the one into the other, through the medium of the compound con- 

 glomerates, which I have just described. North of these beds varieties of 

 slate are found, alternately 'with grey wacke, quartz-rock, hornstone, red sand- 

 stone, and conglomerate, and containing subordinate beds of greenstone, with 

 the porphyritic varieties of the rocks which I have described. This arrange- 

 ment is well exposed, in the western continuation of this coast, extending to- 

 ward Dungarvan. To the eastward of the river Bonmahon the composition 

 is analogous, with this exception, that no red conglomerate appears on that 

 part of the coa.st, forming a portion of this transition series ; it probably, how- 

 ever, occurs inland, as indications of red slate are there observable. More 

 east upon this coast, the steatitic varieties of hornstone and conglomerate are, 

 in particular, well displayed near Annestown, to the east of Kean Head. 



(17.) Disseminated iron pyrites is not uncommon in the transition rocks of this coast, particu- 

 larly in the blackish and bluish slates, which, by mutual decomposition, form sulphates of alumine 



