CO1JNBHASII : BICESTEK. 449 
FT. IN. 
j- Stiff greenish clay (traces). 
fRubbly shelly and earthy limestone 
and marl: Waldlieimia obovata, 
Cornbrash < ^ LV ^ cu ^ a echinata, Pholadomya (large), 
" ) and Myacites - --40 
Hard earthy and shelly limestone : 
Pecten vagans - - - - 1 3 
Pale greenish grey clays : the top part 
used for making bricks the lower 
part too " stony " - - 9 to 10 
Forest Marble ^ Tough blue shelly oolite, -with masses 
of lignite, and greenish marly galls 
I 4 to 5 
LClay (thickness not seen) - about 3 
[Great Oolite ?] " White stone."* 
The beds are faulted with do \vnthrow on the north-west. The 
Cornbrash was formerly burnt for lime, and is used in an 
adjoining quarry for road-metal, but it is a poor stone. The 
Forest Marble clay is used for making red and yellow bricks, 
tiles, &c. The beds are variable in character and thickness : from 
the lowest beds exposed, I obtained Ostrea, Waldlieimia digona, 
and Acrosalenia. 
Many sections have been opened in the Cornbrash which comes 
to the surface over a broad area between \Veston-on the-Green 
and Middleton Stoney, at Bicester, Bucknell, Srratton Audley, 
and Fringford. 
In some places, as near the Workhouse at Bicester, we find 
the Cornbrash resting directly on oolitic shelly limestones belong- 
ing to the Forest Marble ; in other places as at Blackthorn Hill 
the beds rest on Forest Marble clays. The Cornbrash consists of 
rubbly and shelly limestones and marls, and is employed for 
road-metal and burnt for lime. Occasionally we find a hard and 
compact bed of limestone, but the quarries do not expose more 
than 7 feet of the beds, and their total thickness in this area 
probably does not exceed 10 feet. Some of the sections are 
described by Prof. Green, who found fossils to be plentiful at 
Stratton Audley. To the north-east of Fringford the beds are 
largely concealed by Drift, so that sections become less frequent. 
The Cornbrash was exposed in a quarry above Tingewick Mill, 
and also in the cemetery at Buckingham, where it consisted of 
hard sandy limestone, with Avicula echinata, &c.f The thick- 
ness seen, was from 4 to 6 feet ; but it is probably more, judging 
from the sections in the brickyard north-east of Akeley. 
The following sequence of strata was shown at Akeley Brick- 
yard (see Fig. 133) : 
* See section by A. H. Green, Geol. Banbury, pp. 36, 37 ; also, J. F. B'ake, Pt-oc. 
Geol. Assoc., vol. xiii. p. 71. 
f Green, Geol. Banbury, pp. 30, 31. 
E 75928. F F 
