32 
these and other subdivisions of the rocky Strata which compose the Cotswold Hills, and great 
breadths of stony land adjoining, are not there so well defined as in the more abrupt slopes of 
the hills around Bath. The indistinctness of these intermediate Strata renders it difficult in 
many parts to ascertain the division of the two Oolites, and the great similarity of colour in all 
these Strata contributes to the obscurity. The organized fossils are, therefore, in some cases 
essential to the decision. The inferior Fuller’s Earth, and the indurated clay which accom- 
panies it has none of the long turbinated shells, but is distinguished by a peculiar nautilus, 
and some very thick Ammonites ; yet Ammonites agreeing with the more general form are not 
common. Most of the fossils are casts, at least such are most numerous ; all the large bivalves 
are so, except the great rough oyster, and Ostrea diluviana, Linn. (Marshii, Min. Conch.) 
These, like most of the species of oysters in other Strata, have their shells preserved. All the 
smaller fossils in these Strata, as the little hooked oyster, and all the terebratulse, which are very 
numerous, have their shells entire. 
FIG. 
1 Nautilus 
2 Ammonites modiolaris 
3 Modiola anatina 
4 Cardita 
5 Cardium 
6 Tellina 
7 Ostrea acuminata 
8 Ostrea Marshii 
9 Terebratula media 
ORGANIZED FOSSILS . 
Lansdown. 
Dundry. Rowley Bottom. 
Avoncliff. 
Grip Wood. Hardington. 
Charlton Horethorn. Near Gagenwell. Near 
Redlynch. 
Avoncliff. Hardington. 
Orehardleigh. Avoncliff. Below Combe Down. 
Caisson. North of Stamford. 
Monkton Combe. Cotswold Hills. 
Near Bath. Charlton Horethorn. Orehardleigh. 
