FOREST MARBLE: CORSHAM. 
357 
FT. IN. 
Bradford Clay-^ Grey marly clays with, bands of hard ]> 6 
grey marly and shelly limestone : 
with Ap, Parkinsoni, Terebratula 
coarctata, T. maxillata, WaldJieimia 
digona (variable), RhyncJionella con- 
cinna, R. dbsoleta, Ostrea, &c. 
rHard brown oolitic lime-~1 
Great Oolite J ,, 8 l on f ,, ', ,..'. ,. ' L 6 to 7 
Buff shelly and oolitic lime- f 
I stones - - -j 
From the Bradford Clay and Forest Marble at Corsham, I 
obtained the following fossils : 
Saurian bone. 
Strophodus. 
Actaeonina. 
Ataphrus (Monodonta) Labad- 
yei? 
Cerithium. 
Nerinaea. 
Astarte. 
Avicula costata. 
Cyprina islipensis. 
Lima. 
Modiola furcata. 
imbricata. 
Ostrea costata. 
gregaria. 
lingulata. 
Sowerbyi. 
Pecten vagans. 
Unicardium varicosum. 
Rhynchonella concinna. 
obsoleta. 
Terebratula coarctata. 
flabellum. 
maxillata. 
Waldheimia digona. 
Alecto. 
Diastopora. 
Heteropora. 
Terebellaria ramosissima. 
Apiocrinus Parkinsoni. 
Acrosalenia spinosa. 
Cidaris bradfordensis (spines). 
Serpula. 
Isastrsea. 
In the railway-cutting west of Lay cock, a number of fossils 
were obtained by W. Walton, from the Forest Marble, "a cream- 
coloured clay, containing shells better preserved than usual."* 
Traces of Forest Marble were observed in the valley, and in 
the cutting e.ist of the railway-station at Trowbridge.f 
Corsham to Malmesbury. 
The quarries north-west of Corsham, near Upper and Middle 
Pickwick, have been long since abandoned, but others are worked 
here and there as we proceed towards Cirencester. 
The Bradford Clay has been noted near Giddy Hall, north- 
west of Biddestone, and again near Yntton Keynell, but it was 
not clearly exposed at the time of my visit to these localities in 
1886 : I obtained fossils however that proved its presence at Yatton 
Keynell. (Seep.269.) Further evidence of it occurs in the lane 
below West Keynton Church, where resting on the false-bedded 
Great Oolite, there was a bed of marly clay 2 to 3 feet thick, 
yielding Waldheimia digona, Rhynchonella, and other fossils. The 
Great Oolite here, as at Corsham, contains marly layers in its 
upper part, and these become more prominent near Cirencester, 
where there is a greater difficulty in separating the Great Oolite 
* Lycett, Supp. Monograph on the Mollusca from the Great Oolite, &c., p. 118. 
t R. N. Mantell, Quart. Journ. Geol. Soc.,vol. vi. p. 312. 
