FOREST MAKBLE : OORSHAM. 355 
map through Westwood village, should be continued further to 
the north-east, probably traversing obliquely the tunnel east of 
the Bradford-on-Avon railway-station. 
Above the Bradford Clay near Bradford-on-Avon, we find beds 
of shelly and earthy limestone, with much clay and marl, and thin 
leaves of sandy limestone with curious tubicolar markings. 
Locally I saw no evidence of any thick series of limestones, and 
no evidence of the Hinton sand and sandstone. The beds at 
Westwood, and again at Frankley north of Bradford-on-Avon, 
are mainly argillaceous, with occasional bands of stone : so that 
the shallow wells sunk into this formation obtain but limited and 
uncertain supplies of water. 
Further north, between Monkton Farley and Atford, the stone- 
beds are again of importance. Lonsdale noted 10 feet of " shelly 
limestone, split into thin layers obliquely to the plane of 
stratification," at the Wormwood quarry, on the high road from 
Bath to Devizes. Here there was no evidence of the Bradford 
Clay, for these beds rested directly on the Great Oolite 
freestone."* North of Atford, an old quarry showed the following 
strata : 
FT. IN. 
{Brown sands with fissile concretionary 
masses of grey calcareous sandstone - 6 
Thin flaggy and sandy beds, and false- 
bedded shelly oolitic limestones - 13 
Water being held up at the base of the pit, indicated a clay- 
foundation. In this neighbourhood some of the beds have, in old 
times, been used as stone-tiles. 
The occasional absence of the Bradford Clay (as an argillaceous 
deposit) was shown also at the stpne-quarry north-east of 
Monkton Farley church, where about 15 feet of false-bedded 
brown shelly and sandy oolite, with sandy layers and ochreous 
gall?, rested immediately on the Great Oolite. These shelly 
basement-beds on Farley Down, yield Waldheimia digona, Ostrca 
Sowcrbyi, and Rhynchonella. On Bathampton Down, moreover, 
we find in the surface-strata of rubbly stone and marl, fragments 
of Apiocrinus Parkinsoni, spines of Echini, Terebratula coarctata,^ 
Rhynchonella, Lima duplicata, Ostrea Sowerbyi, &c., that indicate 
traces of the Bradford Clay, or of strata equivalent to it. Here- 
abouts and at Corsham there is evidence of a more intimate 
connection between the Bradford Clay and Great Oolite than we 
find to be the case at Bradford-on-Avon. 
In the railway-cuttings near Corsham station, the Forest 
Marble and Bradford Clay may be seen resting on the Great 
Oolite. This is the locality known as Pound Pill, from which 
W. Walton obtained many fossils. The Forest Marble consists of 
grey clays and shales with thin flaggy and gritty limestones, 
together with false-bedded flaggy oolitic and shelly limestones. 
* Trans. Geol. Soc., ser. 2, vol. iii. p. 258. 
f This species was figured by Walcott from specimens obtained from Kings 
Down and Hampton Down, near Bath. 
z 2 
