﻿Vol. 64.] CAEBONTFEKOUS EOCKS AT LOUGHSHINNY. 417 



over sharply to the north, are closely folded, and are some- 

 what contorted. The beds have clearly undergone considerable 

 compression. The nodules in them are squeezed into 1 en tides 

 arranged obliquely to the bedding, the angle of dip is crossed by a 

 system of close joints which approaches a rough cleavage, and the 

 chert-seams are occasionally puckered. But for the presence of 

 the dark seams of chert, the bedding would occasionally be quite 

 obscured by the jointing. Some of the beds are vertical and con- 

 ceal a synclinal fold (see fig. 2, p. 415).^ 



Fossils are abundant in many layers of the beds just de- 

 scribed, and the assemblage is much the same as that found in 

 the Cyathaxonia-Beds nearer Rush, with which the strata have 

 already been identified, both on lithological and on stratigraphical 

 grounds. 



In the next bay to the north. Roaring Well Bay, the exposures 

 are interrupted for a space by the sand of the shore and the Glacial 

 Drift of the cliffs ; but, on the north side of the bay, formed by the 

 cliffs of the south side of Drumanagh Headland, beds of Cyath- 

 axonia-hoYizovL dip southwards at about 50°. They have been 

 measured as closely as circumstances admit, and it is found, by 

 tracing the beds downward step by step from the seaweed-covered 

 rocks fringing the shore to the lowest-exposed bed of an anticline 

 which forms a conspicuous feature at the north-western corner of 

 Roaring Well Bay, that about 260 feet of this calcareous group is 

 exposed (figs. 3 B & 4), The majority of the beds consist of well- 

 bedded limestones; some are pure, but the greater number are 



Fig. 4. — Secti07i in the cliff at the north-western corner of Roaring 

 Well Bay, showing the decalcification of the Cyathaxonia-5ec?5. 



kBlack ShaleH Decalcified Beds >k- Cyathaxonia 



Limestones 

 L'la 



[Horizontal scale: 1 inch = 120 feet.] 



nodular, very earthy, argillaceous, or cherty, and they are inter- 

 calated with shales. Some of the limestone-beds are thick, and, 

 especially in the liigher zones, approach a massive character, one 

 such stratum being 30 feet thick. 



Taking the lowest bed of the anticline mentioned above as a 

 datum-horizon and noting the upward succession towards the south 



^ The notation E22«, L 1 h, L8c, etc., shown in the vertical and horizontal 

 sections, refers to the horizons from which fossils Jiave been obtained, as 

 catalogued in the faunal lists. A similar notation was employed in the Rush 

 paper. It sliould also be mentioned that the Glacial Drift, etc. has been dis- 

 regarded in preparing the horizontal sections. 



2e 2 



