CORNBRASII : CIRENCESTER. 
443 
Cirencester to Fairford, and Swindon. 
The Cornbrash has been well exposed in several places near 
Cirencegter, and is very fo^siliferou?.* Ammonites macro cephalus is- 
usually to be found, and fine examples of Waldheimia obovata 
and W. lagenalis are abundant, and they exhibit forma that link 
the two species together. In quarries to the north of Sharncott, 
there may be found many fine specimens of Ostreafldbelloides. 
The best section was that exposed on the Midland and South- 
western Junction Railway, to the south of Watermoor Station, 
Cirencester, between Siddington St. Mary and Siddington St. 
Peter : the following beds were shown : 
Cornbrash 
8. Earthy limestone 
7. Marly clay or loam - 
6. Earthy limestone with Modiola and 
large Pholadomya - 
5. Impure marly and sandy clay, with 
nodular masses of limestone con- 
taining clusters of Waldheimia 
obovata : also Am. vnacrocephalus, 
Ostrei* flabelloides, Echinobrissus, 
&c. - 
4. Hard earthy limestone with few 
fossils - 
3. Earthy limestone and marl, large 
Ammonite, Ostrect flabelloides 
2. Earthy and shelly limestones with 
seams of marly clay, and many 
fossils, Nautihis, Avicula echinata, 
Modiola, Myacites, Pecten vagans 
(in bands), Ostrea, Rhynchonella 
concinna, Waldheimia obovata (large 
specimens), Terebratula intermedia 
[_ (abundant near base), Serpula, &c. 
Forest Marble - 1. Dark clays with little or no stone 
FT. IN. 
1 
6 
25 
The beds are faulted in several places, as shown in the section. 
(Fig..l31, p. 444.) Further south near Nooks, the Cornbrash was 
again exposed in a railway-cutting to the depth of about 5 feet. 
Waldheimia lagenalis and W. obovata were found abundantly, as 
well as other fossils, including large specimens of Homomya. 
The beds exposed were the same as those shown in the central 
portion of the above section. 
Other sections were to be seen north-east of Cerney Wharf, 
and north of Cerney Field Barn ; and the junction with the 
Forest Marble was shown in quarries at Ampney Crucis and 
Driffield Cross. (See p. 366.) 
The fossils found at Cirencester are noted in the accompanying; 
list, with which we may conveniently include the species obtained 
at Fairford, and those procured from a well-sinking at Swindon,. 
at depths of from 685 to 703 feet. 
In the Swindon Well the thickness of the Cornbrash was 
estimated at 18 ft. 3 in. It consisted of hard grey shelly lime- 
* See also J. Buckman, Quart. Journ. Geol. Soc., vol. xiv. p. 121, and Proc. 
Cotteswold Club, vol. i. p. 262. 
