Geological Society. 387 
PROCEEDINGS OF LEARNED SOCIETIES. 
GEOLOGICAL SOCIETY. 
January 5th, 1921.—Mr. R. D. Oldham, F.R.S., 
President, in the Chair. 
The following communication was read :—. 
‘The Carboniferous Limestone of the Wickwar-Chipping 
Sodbury Area (Gloucestershire).? By Miss Edith Bolton, M.Sc., 
and Miss M. C. Tuck, B.Sc. 
The Authors describe, in Vaughan’s notation, from both the 
lithological and the faunal standpoints, the north-eastern rim of 
the Carboniferous Limestone ‘ horseshoe’ round the Bristol Coalfield. 
The chief points of interest in the area, and of demarcation from 
the type-section of the Avon Gorge, are :— 
(1) The marked development and fossiliferous nature of the ‘ Sub-Oolite’ 
band of the Caninia Zone. 
(2) The great thickness of the Concretionary Beds of the main Seminatla 
Zone. 
(3) The Modiola Phase at the top of S, is further marked by algal lime- 
stones, in addition to concretionary beds, 
(4) The unfossiliferous character and variable lithological features of the 
beds forming the top of the main Seminula Zone and the Lower Dibuno- 
phyllum Zone make it impossible to draw any line of demarcation 
between these two zones. These beds are therefore designated 
*S,—D, junction.’ 
(5) The early oncoming of ‘ Millstone Grit’ conditions. 
February 2nd, 1921.—Mr. R. D. Oldham, F.R.S., 
President, in the Chair. 
. 
The following communication was read :— 
‘A New Species of Blattoid (Archimylacris) from the Keele 
Group (Stephanian) of Shropshire.’ By Herbert Bolton, M.Sc., 
F.R.S.E., F.G.S. 
The Author describes the basal portion of a new type of Blattoid 
