100 CARBONIFEROUS LIMESTONE OF TYTHERINGTON DISTRICT. 
contributed a paper on the section to the Proceedings of the 
Cotteswold Naturalists' Field Club 1 in 1889, and described it at 
the Bath meeting of the British Association 2 in 1888. 
Dr. Vaughan, in his classical paper on ' The Palseontological 
sequence in the Carboniferous Limestone of the Bristol Area ' 3 
(1905) gave a full account of the section. In the same paper brief 
allusion is made to quarries at Old Down E. of Olveston, and on 
the Ridgeway. 
III.— DESCRIPTION OF THE EXPOSURES. 
Dibunophyllum-Zone. 
All the exposures of the southern end of the area from Over as 
far as Woodhouse, appear to belong to this zone. By far the best 
section of these beds is in the cutting W. of the Over tunnel. To 
the E. of the road the dip is south-easterly, and the rocks consist 
of limestone often oolitic, with shale and thick bands of red grit. 
Fossils are plentiful in the limestone. Similar rocks are seen W. 
of the bridge folded into an anticline. We hope to describe 
this fine section in detail at a later date. To the S. of the railway, 
grits are exposed in two small quarries at Over. Knole Park 
stands on Dibunophy Hum-beds y limestone being exposed at several 
points in Over lane, and also in the grounds, where Cyathophyllum 
murchisoni and other characteristic fossils may be found. The 
exposures are, however, very bad. A band of grit striking 
N.N.E. is seen about 100 yards N. of the Lodge. This band crops 
out again in the fork of the road at the western end of Almonds- 
bury Hill. 
On Almondsbury Hill and to the S.W. the rocks are much dis- 
turbed and have yielded few fossils, though Lithostrotion irregulare 
may be found in the shale-bands of the old quarry below the outlook 
place. 
An old quarry to the E. of the turning to Tockington at Ridge 
Wood gives a fair section of Dibunophyllum-beds. Here white 
oolitic limestone with abundant Productus hemisphericus is 
associated with rubbly limestone and shaly partings containing 
Cyathophyllum murchisoni. The most northerly exposure of 
Dibunophyllum-beds occurs near the turning to Tockington at 
Woodhouse Down, the exposures include grit as well as limestone. 
The dip of the Dibunophyllum-beds where undisturbed is always 
S.E. orS.S.E. at 35-50?. 
1 Proc. Cotteswold Nat. Field Club, Vol. IX, pp. 325-333. 
2 Rep. Brit. Ass. for 1888 (Bath), Trans. Sect. C, pp. 658-659. 
3 QJ.G.S., Vol. LXI, pp. 219-225. 
