Vol. 55.] 



BEDDED EOCKS OF COUNTY WATEEFOED. 



727 



Fig. 4. — Ground-plan of the 

 foreshore near Tramore (dis- 

 tance = about 150 yards). 



position, with a strike from north-east to south-west ; while on the 

 reefs at low water the slates alone 

 are exposed, but in a much crushed 

 condition. The exceedingly com- 

 plicated relation of the slates and 

 limestones does not extend for 

 more than 100 yards, and then 

 the diabase [112 w] comes down 

 and spreads out over the fore- 

 shore, enclosing patches of the 

 bedded rocks. Their relations are 

 not, however, quite simple even 

 here, for their line of junction 

 is wavy and irregular, and along 

 it they are occasionally crushed or 

 shattered into a friction -breccia. 

 There is no evidence that we 

 are dealing with an unconformity 

 due to contemporaneous denuda- 

 tion and original conditions of 

 deposition, but all the facts point to 

 mechanical disturbance subsequent 

 to the deposition and consolidation 

 of the beds (fig. 4). 



In a small cove below Doneraile 

 AYalk occur (fig. 5, p. 728) thin 

 beds of fine black argillaceous 

 slates, ashy grits, and cherty beds, 

 all very much baked and altered, 

 and resting on the diabase, which 

 is seen to be intruded into their 

 base. These beds bave the same 



dip as the limestones which underlie the diabase (fig. 6, p. 728), and 

 there is nothing to make us doubt that they are part of the same 

 regular conformable series, and that they occur in their true order 

 of succession. On the south side of this cove, and resting upon the 

 fine black slates, etc., is seen an intrusive sheet of peculiar grey 

 altered diabase [66] [10] [18] [12], which separates them from 

 some pale greenish bedded felsites. These appear to be contempo- 

 raneous volcanic rocks, and to overlie regularly the sedimentary beds 

 (fig. 7, p. 729). As the trend of the coast is just here across tho 

 strike of these beds, it is possible to trace the succession in the clifi's 

 in spite of the interruptions due to subsequent intrusions. Tbese 

 bedded felsites [13] [80] [54 w] are seen dipping at angles of 60° to 

 70° into the cliff's, and thus agreeing with the above-mentioned 

 sedimentary beds. The section shown in fig. 7 (p. 729) is seen iti 

 the face of one of the small projecting spurs of cliff. 



There is a thick irregular mass of greyish felsite [120] [58 w] 

 intruded among the bedded felsites in the cliff as one approaches the 

 steps down to the beach from DoneratLe Walk, and at this place the 



A=Intru3ive diabase [112 w]. 



B=Impiire limestones, dipping 

 into the cliffs at high angles 

 (Tramove Limestone Series). 



C=Black slates, locally much dis- 

 turbed and crushed (Tramore 

 Slates). 



C'= Fault-breccia. 

 DD:= Outline of coast. F=Fault. 



