16 THE CARBONIFEROUS LIMESTONE OF BURRINGTON COMBE 
being made only when striking differences in the facies at 
certain levels have called for them. 
The Burrington Section shows, from the level at which 
marine limestones first predominate to the top, an un- 
broken series of fossiliferous limestones. It is, therefore, 
very suitable as a type section. 
In this paper the section is treated zonally. Under 
each zone are given : — 
(1) A brief description of exposure and of lithological characters. 
(2) Lists of the corals and brachiopods occurring in the zone. 
(3) Special faunal characters. 
(4) A comparison with the equivalent part of the Bristol sequence. 
The paper is accompanied by a map, a horizontal section 
and a vertical section. The two former may prove useful 
to any one examining the section. With the latter I have 
given a vertical section of the Avon sequence, taken from 
Dr. Vaughan’s paper, by kind permission of the author 
and of the Council of the Geological Society. These vertical 
sections are useful for reference during comparisons, and 
show the lithological sequence in each case. 
In all places throughout the paper where reference is 
made to the Bristol Area, the information was obtained 
from Dr. Vaughan’s paper. 
In the faunal lists I have followed exactly the system 
of specific naming adopted by Dr. Vaughan in his work. 
Each specific name is used in the same sense in which it 
is employed in his paper. 
I am under a very deep obligation to Dr. Vaughan ; in 
general, for the great encouragement which he has given 
me in undertaking this work, and for his continual advice ; 
in particular, for much assistance in the examination of 
the section and for invaluable help in the palaeontological 
work. For all this I offer him my sincere thanks. 
I am indebted to Professor S. H. Reynolds, M.A., F.G.S., 
for his kind assistance ; and to Mr. F. P. Burt for very 
valuable help in the field. 
