FOREST MARBLE : CIRENCESTER. 363 
fessor of Natural History at the Koyal Agricultural College; 
and many of the specimens he collected are preserved in the 
College Museum. These were obtained, some from excavations 
on the College Farm, but most of them from the cutting beneath 
the Great Western Kail way on the high-road (Akeman Street) 
between Tetbury and Cirencester.* 
Similar evidence was obtained in the railway-banks at Kemble ; 
near the Mount, Trewsbury Castle ; at Ewen ; at Smerrill Quarry, 
north-east of Kemble ; and at Perry Moor, south of Oakley 
Park. 
The section exhibited in the Tetbury road-cutting in 1886, was 
as follows : 
FT. I*. 
in j. -\/r 1.1 f Rubble and tumbled masses of fissile 
Forest Marble - 1 ghelly Qolite> with lignite 
-D JP j m f Grey clay with thin rubbly beds of 
Bradford Clay | oolitic marly limestone - - 3 6 
{Pale shelly oolite - - 2 6 
Brown marly oolite, and hard compact 
limestone with scattered oolitic 
grains - 3 
White and brown false-bedded shelly 
oolite - - - - 5 
Fossils are fairly abundant in the Bradford Clay, and they 
indicate the same palaeontological horizon as that at Bradford-on- 
Avon. The following species have been found in the Clay near 
Cirencestert : 
Ammonites discus. 
Avicula costata. 
Oardium. 
Cypricardia caudata ? 
rostrata. 
Myacites. 
Ostrea acuminata. 
Pecten vagans. 
Trigonia costata. 
Ehynchonella concinna. 
spinosa var. bradfordensis. 
Ehynchonella varians. 
Terebratula coarctata. 
maxillata. 
"Waldheimia cardium. 
digona. 
Serpula. 
Apiocrinus Parkinson!. 
Cidaris (spines). 
Clad ophy Ilia. 
Montlivaltia. 
Remains of Fishes and Saurians have also been obtained. 
The greatest thickness of clay, that in this neighbourhood 
may be grouped as Bradford Clay, appears to be 8 feet. 
There is considerable difficulty near Cirencester and Minchin- 
hampton in fixing a definite boundary between the Great Oolite 
and Forest Marble. This arises from the fact that the Bradford 
Clay is not persistent, and when present it is not always fossili- 
ferous, while other clayey and marly beds occur at various 
horizons in the Great Oolite. We are however prepared for this 
state of things by the evidence afforded at Corsham ; and we must be 
content with the knowledge that no persistent plane of demarcation 
* See Proc. Cotteswold Club, vol. i. p. 6 ; and J. Buckman, Quart. Journ. Geol. 
Soc., vol. xiv. p. 114, vol. xvi. p. 107. The railway-station formerly situated by the 
high-road was replaced by that at Kemble. 
f See also Lycett, Cotteswold Hills, p. 106. 
