GREAT OOLITE : CHEDWORTH. 
291 
Great Oolite 
(Upper 
Division). 
Bubbly bands of shelly oolite 
Marly layer (impersistent) 
Even beds of more or leas oolitic lime- 
stone the top layer a hard white and 
pinkish limestone with scattered grains 
of oolite - 
Pale limestones, as above, with ferru- 
ginous cavities like Dagham stone in 
top layer - - 
FT. 
4 
1 
Is. 


The pink limestone here is of the nature of that discovered by 
Prof. Marker, for I had brought away a specimen of it, which, 
closely resembles the rock he kindly sent to me. 
Further on to the south of Chedworth, the lower beds of 
Great Oolite were exposed as follows : 
- 
I 
-ry ?P. er > Rubble of white oolite and marl. 
f Hard fine-grained and false-bedded oolite 
{(freestone) - - - 4 to 
Blue and brown clay with sandy layers 
and Ostrea. 
Impersistent bands of hard partially 
oolitic sandy limestone, fissile and false- 
bedded in places ; and impure fuller's 
earth. 
Fullonian - Clays. 
FT. IN, 
On the south side of the Chedworth tunnel, the flaargrv beds- 
O"/ 
appear somewhat concretionary, and the Fullonian clays imme- 
diately below, yielded Ostrea acuminata. (See Fig. 42, p. 128.) 
The Great Oolite and Forest Marble were shown in a quarry by 
the high-road, west of Coin St. Denis, where the section was as 
follows : 
Forest Marble. 
Great Oolite 
f Oolitic and shelly limestone with 
I ochreous galls and fine oolite 
I Thin-bedded oolite and laminated marly 
[ clay ..... 
("Compact brown limestone with occa- 
sional oolitic grains and dendritic 
FT. IK. 
(Upper Division). | markings 
I Hard brown limestones - 
Prof. Hull reckoned the thickness of the upper division of the 
Great Oolite at Coin St. Denis to be as much as 145 feet, and 
that of the lowev 45 feet ;* but the evidence since afforded by the 
boring at Burford, and by railway-cuttings in Gloucestershire, 
would lead to the conclusion that the total thickness of the 
formation does not exceed 120 feet. 
The cuttings on the Banbury and Cheltenham railway, between 
Andoverrford and Bourton-on-the Water have thrown much light, 
on the nature of the Great Oolite in that region. (See Fig. 43, 
p. 131.) The beds become much more argillaceous, especially in 
the lower division, than they are near Cirencester and Tetbury on 
* Explan. Hor. Soc., Sheet 59, p. 3. 
T 2 
