©n tbe Carboniferous limestone of tbe district 
between ©ver anb ^tberington, (Sloucestersbire- 
By S. H. Reynolds, M.A., Sc.D., and D.E. Innes, B.A. 
I . — INTRODUCTION . 
OUR object in this paper is to trace the sub-divisions estab- 
lished by Dr. A. Vaughan for the Carboniferous Limestone 
of the Avon Section over a part of the Bristol area where the rocks 
have not hitherto been examined in detail. The rocks under 
consideration form the western and north-western part of the rim 
of the Bristol coalfield. From Over at the southern end of the area 
they extend north-eastwards through Almondsbury and Ridge way 
to Alveston, forming a narrow ridge-like outcrop rarely more than 
a quarter of a mile wide, and often very much less. This ridge is 
followed by the Ridgeway, formerly the old Roman road to the 
north, and now the main road between Bristol and Gloucester. 
At Alveston the outcrop suddenly widens, and the Carboniferous 
Limestone extends westwards to Tockington, and though partly 
concealed by the Trias, to Olveston, Elberton and Littleton-upon- 
Severn. Eastwards from Alveston as far as the termination of 
our map along the line of the railway between Tytherington and 
Grovesend the outcrop narrows somewhat, and the strata are 
shifted southwards by two faults. 
It should be stated that we have not attempted to re-map the 
outcrops in detail, but have in the main copied the boundaries 
from the i-inch survey map. In places, however, we have found 
it necessary to differ from the Survey mapping. 
II.— PREVIOUS WORK. 
C. Richardson, 1 in 1862, gave an account of the section seen in 
the railway cutting and tunnel north of Over on the Severn 
Tunnel line. 
Though a re-description of the Tytherington-Grovesend railway 
section does not come within the scope of this paper, it is desirable 
to allude to former papers upon this fine section. It was described 
in 1888 by Prof. Lloyd Morgan 2 whose paper was illustrated by 
a detailed section and coloured map. The Rev. H. H. Win wood 
1 Rep. Brit. Ass. for 1861 (Manchester), Trans, of Sections, p. 130. 
2 Proc. Bristol Nat. Soc, new ser., Vol. VI. pp. 1-17. 
