﻿Vol. 6 I.] PALZEONTOLOGICAL SEQUENCE IN THE BRISTOL AREA. 181 



II. The Pal^ontological Sequence in the Carboniferous Lime- 

 stone of the Bristol Area. By Arthur Yaughan, B.A., 

 D.Sc, F.G.S. (Read June 8th, 1904; rearranged, and 

 additional matter incorporated, October 1904.) 



[Plates XXII-XXIX.] 



Contents. 



Page 



I. Introd action , 181 



II. Detailed Description of Continuous Sections and Isolated Exposures 



in the Bristol Area 188 



i) Continuous Sections :— 



(a) The Avon Section 188 



Analysis of Stoddart's Paper 200 



(b) Sodbury 203 



(c) The Failand Area (including Flax Bourton) 211 



(d) The Tytherington Section 219 



(e) The Clevedon Area 225 



(/) The Portishead District 228 



(ii) Isolated Exposures : — 



(A) In the Clifton-Clevedon Eidge 231 



(B) In the Clifton- Westbury-King's Weston Ridge 233 



(C) In the Wickwar-Sodbury Ridge 236 



(D) In the Olveston-Tytherington-Cromhall Ridge 239 



(E) The Backwell-Wrington Mass 240 



III. Ranges and Maxima of the Corals and Brachiopods in the Bristol 



Area 243 



IV. Comparison of the Bristol Sequence with that in Neighbouring 



Areas 248 



V. Comparison with the Belgian Sequence 255 



VI. Summary and Analysis 257 



VII. Notes on the Corals and Brachiopods referred to in the Faunal 



Lists 266 



{ 



I. Introduction. 



This paper deals with the fossil sequence in the Carboniferous 

 Limestone of the Bristol area, and with the possibility of dividing 

 that system into a series of palseontological zones. 



The general geology of the area has been most luminously 

 expounded by Prof. Lloyd Morgan in the series of papers which 

 he has contributed to the Proceedings of the Bristol Naturalists' 

 Society, and to these I make constant reference. I am thus able 

 largely to dispense with detailed accounts of topography and litho- 

 logy, which would otherwise interrupt seriously the palaeontological 

 discussion. 



Mr. E. B. Wethered.has contributed a most instructive paper 

 Q.J.G.S. No. 242. o 



