﻿Vol. 64.] THE CAEBONIFEKOUS EOCKS AT LOTJGHSHINNY. 



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appeared, from the palaeontological evidence available at the time, 

 to range from the ZapTirentis- to the Lower Seminida-Zojies. 

 Fresh information set out in the present paper has, however, 



rendered this correlation doubtful, and 

 the possibility that the conglomerates 

 are of DihunopTiyllum - age is now 

 recognized by Dr. Yaughan. To the 

 north of the Carlyan Limestones oc- 

 curs an isolated outcrop of limestone 

 (Kate-E-ocks Limestones of possibly 

 tipper Seminula-age) ; and, still far- 

 ther north, a groui3 of richly-fossili- 

 ferous cherty and earthy flaggy lime- 

 stones with shales is assigned to a 

 subdivision (Cyat7iaa:onia- subzone) of 

 the Dihunophyllum-ZonQ, and is corre- 

 lated with the top of the Avonian of 

 the Western Midlands of England. 

 About 200 feet of the Cyathaoconia- 

 Beds were recognized in the area then 

 described. 



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II. Description of the Rocks. 

 [C. A. M.] 



(A) From Brook's End to Lough- 

 shinny Bay. {Cyathaxonia - 

 Beds). (Fig. 2.) 



At Brook's End the Cyathaxonia- 

 Beds, striking 10° north of east, are 

 arranged in an asymmetrical syncline, 

 those on the south side of the cove 

 being vertical or nearly so,^ while on 

 the north the dip is at an angle of 30^ 

 to 35° in a southerly direction. The 

 axis of the syncline is poorly exposed,, 

 but shows some minor contortions 

 along it near high-water mark. 



The Cyathaxonia-'Beds hereabouts 

 consist of two divisions : — 



(a) A lower set of thinly-bedded impure 

 limestones, with abundant small lenticular 

 nodules imparting to the beds an 'augen '-ap- 

 pearance; they areinterstratified with thicker 

 bands of purer non-nodular limestones (see 

 fig. 10, p. 291, op. jam cit.). 



(b) An upper set of impure limestones, 

 more thickly-bedded than the ' augen '-set, 

 and much less frequently exhibiting the 

 ' augen '-like character of the lower beds. 



Quart. Journ. Geol. See. vol. Ixii (1906) fig. 10 & p. 293, 



Q.J.G.S. No. 255 



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