Vol. 55-] 



BEDDED EOCKS OF COUJJJTT WATEEEORD. 



'25 



The section now increases in . complication, and we meet with 

 bedded fine felsitic tuffs [611] [610] dipping into the cliff at angles 

 from 45° to 60°, and associated in an intricate manner with the 

 intrusions of diabase [607] and greyish felsite [606], On the 

 south side of a projecting spur fine-bedded greenish felsitic tuffs [610] 

 are seen, containing many vesicular fragments, and with occasional 

 interbedded bauds of darker tuff [611] passing into a patch of 

 coarse agglomerate at the base of the cliff. These beds dip at 

 about 60° into the cliff, and are traversed by numerous small faults 

 and thrusts. A bluish-grey rotten intrusive rock of doubtful nature 

 [608] [517], with vesicular margins and showing conspicuous 

 spheroidal jointing with concentric shells, cuts across them and 

 covers nearly all the foreshore, but on the south side of this mass 

 the tuffs with thin-bedded felsites are again traceable, dipping into 

 the cliffs at 45°. One of these felsites [609], which thickens out at 

 the expense of the tuffs, is dark green and contains porphyritic 

 felspars. Following the cliffs southward we find small veins 

 of a new type of felsite piercing the bedded rocks and entangled 

 with them. These small veins, in a distance of about 100 or 

 150 feet, swell out into massive sheets of a bluish-grey flinty felsite 

 which belongs to a later outburst of volcanic activity, and with 

 the complex group of intrusions of diabases, felsites, etc., dis- 

 played on the south side of Newtown Head, brings the cliff- 

 sections here to a close at the northern end of Woods town Strand. 



In the small cove below Ballyglan House, on the north side of 

 Knockaveelish Head, the 



cliffs are made up of 

 soft black slates, greenish 

 mudstones, and thin 

 flags dipping mostly at 

 70° north-westward, but 

 in places much crushed 

 and disturbed, and at the 

 southern end folded over 

 in a gentle anticline. 

 Though in Sheet 179 of 

 the Geological Survey 

 map this locality is 

 marked with an asterisk, 

 I have myself been un- 

 able to find any fossils 

 here or to identify any in 

 the Survey Collections. 

 The age of these beds 

 must therefore remain 

 doubtful for the present. 

 The Old Eed Sandstone 

 Conglomerate rests upon 

 them unconformably. 



Fig. 2. — Ground-plan of disturhed beds 

 on the foresJwre near Tramore. 



.i=rlntrusive sheet of diabase [112 w]. 

 B=Impure limestones (Tramore Limestone 



Series), slightly folded, locally crushed : 



dip mostly vertical. 

 C = Black slates, much crushed, and appearing 



as irregular tongues in the limestones. 

 P= Intrusive vein of felsitic glass [110 w] [33]. 

 A few yards east of this locality similar veins 



pierce the slates, and are involved in their 



crushing and crumpling. 

 [See p. 726.] 



