INFERIOR OOLITE SERIES : BATH. 97 
is well seen at Charlcombe, but similar layers occur throughout 
the mass of the Inferior Oolite. 
The Inferior Oolite is exposed beneath the Fuller's Earth Clay 
by the canal-bridge near the waterworks at Bradford-on-Avon ; 
and again by the canal opposite to Limpley Stoke. It consists 
of brown shelly limestone, imperfectly oolitic, resting on pale 
oolite, and lower down oolitic limestone with casts of shells. In 
places the beds are shown to have a thickness of nearly 40 feet ; 
but they all apparently belong to the zone of Ammonites Parkinson?. 
By the canal-side near Avoncliff, Mr. E. A. Walford obtained 
Trigonia duplicata and Nerincea ; and at Freshford Mr. Hudleston 
obtained Nerincea Guisei. 
On top of the Midford Sands in the short Lyncombe cutting, 
between the Combe Down tunnel and the tunnel under Devon- 
shire Buildings, there is a bed of nodular fossiliferous limestone, 
containing Lithodomus-borings. The bed is fossiliferous and is 
suggestive of the slow accumulation of the strata, accompanied 
by local erosion ; from it the Rev. H. H. Winwood obtained the 
following species, which were identified by Dr Wright* : 
Ammonites Brocchii ? Lithodomus. 
Astarte excavata. Pholadoraya. 
Gervillia Hartmanni. Trichites undulatus. 
Homomya crassiuscula. Trigonia costata. 
Lima gibbosa. Rhynchonella spinosa. 
A similar bed occurs at the base of the Inferior Oolite south of 
Midford railway-station. 
At the base of the Fuller's Earth at Midford and again at 
Duncorn Hill, we find clays and thin layers of earthy limestone, 
yielding Tercbratula globata, Ostrea, &c. 
South-east of Duncorn Hill a quarry and road-cutting showed 
about 15 feet of Inferior Oolite beneath the Fuller's Earth. The 
top layer of hard brown limestone was bored by Lithodomi and 
Annelides, and similar borings occurred at lower horizons in the 
beds ; these strata consisted of hard oolitic and occasionally com- 
pact limestone, yielding Avicnla Munsteri, Cardium, Isocardia, 
Myacites, Ostrea, Tngonia, Rliynchonella obsoleta, Terebratula 
globata, and Corals. The Geological Survey Map in this neigh- 
bourhood does not clearly explain the relations of the several 
groups of strata, and some revision is needed. 
North- west of Highbarrow Hill. (Twerton Hill), a quarry 
showed about 10 feet of pale oolite, thin-bedded and rubbly in 
the upper part, and much lime-washed ; below there was 3 feet ol 
pale and brown oolite with casts of Trigonia, &c. Mr. Hudleston 
records from this bed Nerincea Guisei, Alaria, Ottrea, c. He 
also observed on the opposite side of the road in a disused quarry, 
a shell-bed with Nerincea, Ceromya striata, Plioladomya lleraulti t 
Myacitcs, and Corals, f 
* Geol. E. Somerset, p. 119. 
f Inf. Qul. Gasteropoda, p. 55. 
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