﻿Vol. 6 1.] SEQUENCE IN THE BRISTOL AREA. 265 



Kidwellian is suggested x as the index of the Upper Avonian, 

 since, in the neighbourhood of Kidwelly (Caermarthen) : — 



(1) The Lower Avonian appears to be very incompletely developed ; 



(2) The Seminula- and Dibunophyllum-Zones are magnificently 



displayed.— A. V., April 8th, 1905.] 



Epitome of Conclusions. 



1. The faunal sequence is constant throughout the extended area 

 in the South-West of England and South Wales. 



2. The study of the fauna affords clear evidence of evolution. 



3. The Tournaisian and Yisean facies are essentially distinct. 



4. The separation of a ' Lower Limestone-Shale ' Series at the 

 base, and an ' Upper Lim stone-Shale ' Series at the top, is opposed 

 to the palaeontological evidence. 



5. The base of the ' Millstone-Grit ' is not a definite level, but 

 occurs at different levels in the Yisean in different localities. 



6. The transition of the Upper Old Red Sandstone into the Car- 

 boniferous Limestone, where perfectly continuous, was accompanied 

 by a particular faunal phase. 



I owe so much to the kindness of other geologists, who have so 

 readily helped me during my work, that an adequate acknow- 

 ledgment is entirely out of the question. 



My thanks are due to Dr. A. Smith Woodward, Dr. F. A. Bather, 

 and Mr. Lang, at the Natural History Museum ; to Mr. E. T. 

 Newton, Mr. J. Allen Howe, and Mr. H. A. Allen, at the Museum 

 of Practical Geology ; and to Mr. H. Bolton, at the Bristol Museum, 

 for the great assistance which they have given me during my work 

 at the collections housed in their respective institutions. Also to 

 Mr. H. C. Playne for permission to examine the Clifton-College 

 collection ; and to Prof. S. H. Reynolds for much assistance during 

 my work at the Stoddart Collection, preserved in University College, 

 Bristol. 



I have also to thank Dr. Bather for naming crinoids, Mr. Lang 

 for great assistance with the bryozoans, Dr. Wheelton Hind for 

 naming my lamellibranchs, and Mr. J. E. Walker for very generously 

 assisting me in brachiopod work by the loan of papers and specimens. 



To Prof. Lloyd Morgan T am indebted for much valuable in- 

 formation, and above all for his unwearying appreciation and 

 encouragement. 



I have to thank Mr. E. Dixon for his iuvaluable help during my 

 visit to the Kidwelly and Tenby areas. 



To Prof. S. H. Reynolds I am under a deep obligation for his 

 continuous help, and in particular for his very valuable assistance 

 in the examination of the Sodbury section. 



1 The final acceptance of this index-term must, however, await the detailed 

 results of the present re-survey of the Kidwelly area by the officers of 

 H.M. Geological Survey. 



