﻿Vol. 6 1.] LIMESTONE 0E WESTON-SUPER-MARE DISTRICT. 561 



(2) There are two important structural features of this ridge : — 

 (a) A reversed fault, running the whole length of the ridge, which 

 has thrown tSyringothyris-Beds, on the south, against Seminula- 

 Beds, on the north ; and (b) A large overfold of the jSeminula-'Be&s 

 on the north side of this fault. 



(3) On the south of the fault there is a sequence from C x to S 2 ; 

 on the north S only is represented. 



(4) Th,e lower part of C, consisting of the ' laminosa-dolomites ' 

 and ' Camma-Oolite,' and indicating, therefore, the prevalence of 

 shallow-water conditions, resembles the equivalent part of the 

 Clevedon sequence (Bristol area). 



(5) The upper part of C, consisting of a thick series of fossili- 

 ferous limestones, closely resembles the corresponding part of the 

 Burrington section, and indicates, therefore, the predominance of a 

 Men dip facies. 



(6) The semireticulatus-suhzone [SJ is well developed. There is 

 a very rich and important faunal level at the base. Altogether, the 

 characters of this subzone are in striking agreement with those of 

 the same subzone at Cheddar, in the Mendips. 



(7) The Cora-subzone [SJ is very incompletely displayed ; but, 

 so far as can be determined, it is normally developed. 



(8) The Woodspring ridge shows a sequence from the Upper 

 Zaphrentis-Zone [Z 1 to the top of C 1 . The whole of this series is 

 exactly similar to the equivalent part of the Clevedon sequence, 

 that is, the higher part of Z 2 is very fossiliferous, and Horizon y 

 (characterized by the association of Zaphrentis spp. with very 

 abundant Caninia cylindrical') is clearly denned; while C 1 consists of 

 a fine development of the ' laminosa- dolomites ' and ' Caninia- 

 Oolite.' 



(9) In the Woodspring ridge the contemporaneous igneous 

 rocks occur at Horizon y. In the Weston- Worle ridge, however, 

 the igneous rocks occur just above the ' Camma-Oolite/ and about 

 450 feet below the top of C. It is evident, therefore, that there 

 were two periods of volcanic activity in this district, one of which 

 occurred at the close of Zaphrentis-time, while the other occurred 

 comparatively early in JSyringothyris-time. 



Discussion. 



The Chairman (Mr. E. S. Herries) said that he was glad to welcome 

 a new author who was taking up the interesting and, so to speak, 

 fashionable line of zoning the Carboniferous rocks. 



Dr. Whe blton Hind congratulated the Author on the accom- 

 plishment of a very successful piece of work on the Weston- Worle 

 Carboniferous ridge. The speaker had had the advantage of being 

 conducted over the ground by the Author, and he was of opinion 

 that the latter s conclusions were correct. There was no doubt as 

 to which divisions of the Avon section, and their equivalents in the 

 Burrington Gorge north of the Mendips, the beds exposed near 

 Weston belonged. The paheontological study of the rocks made 



Q. J. G. S. No. 243. 2 r 



