CORNBRASH : CIRENCESTER. 
445 
stone and somewhat gritty limestone, with layers of sandy marl 
and clay. Near Fairford the Cornbrash was exposed to the west 
of the village, by the " Three Magpies" Inn; and also to the east 
of Blackford Farm, where it is opened to a depth of 6 or 7 feet, 
and presents its ordinary characters of rubbly earthy and shelly 
limestones with intercalated marly beds. Another quarry was 
situated by the Lechlade road, on the east side of Fairford. 
The tract north-west of Fairford is noted as the locality for the 
Fairford Corals, which have been assigned to the Cornbrash: 
they belong in reality to the Great Oolite. (See p. 297.) 
LIST of FOSSILS from the CORNBRASH of CIRENCESTER, 
including SHARNCOTT and SIDDINGTON (C.), FAIRFORD (F.), 
and SWINUON well-sinking (S.) : 
Ammonites discus, 0. 
macroceplialus, C. 
Nautilus, C., F. 
Cylindrites P, S. 
Natica, C., S. 
Avicula echinata, C., F., S. 
Cardium Buckmani, C. 
cognatum, F. 
Ceromya concentrica, C. 
Cypricardia, C. 
Cyprina, C. 
Gresslya peregrina, C., F., S. 
Homomya gibbosa, C., F. 
Isocardia minima, F. 
Lima, S. 
Modiola imbricata, C. 
sowerbyana, S. 
Myacites calceiformis, C. 
decurtatus, C., S. 
securiformis, C., F., S. 
sinister, S. 
Terquemeus, S. 
Ostrea flabelloides, C. 
So-werbyi, C. 
Pecten demissus, 0., S. 
Pecten vagans, C., F. 
Pinna cuneata, 0. 
Pholadomya deltoidea, C. 
lyrata, F. 
Trigonia, C., S. 
Rhynchonella concinna, C., F. 
varians, S. 
Terebratula intermedia, C., F. 
maxillata, C. 
"Waldheimia lagenalis, C. 
obovata, C., F., S. 
ornithocephala, S. 
Cytheridea subperforata P S. 
Serpula tetragona, S. 
tricarinata, C. 
Acrosalenia spinosa, 0. 
Echinobrissus clunicularis, C., S. 
orbicularis, C. 
quadratus, 0. 
Cristellaria crepidula, S. 
cultrata, S. 
rotulata, S. 
Lituola nautiloidea, var. de 
pressa ?, S. 
(Lignite), C. 
Fairford to Witney and Woodstock. 
From Fairford to Witney the Cornbrash is exposed over a 
broad band of country. It is locally known as the " stone brash," 
in distinction from the " flat stone " of the Forest Marble. 
Shallow quarries are seen here and there, near the cross-roads 
between Shilton and Black Bourton, and eastwards on the road 
to Norton Brize. Nautilus is usually to be found in this area, 
also Holectypus depressus and many of the common forms noted 
in the list from Cirencester, &c. 
Prof. Hull notes a section near Alvescott Downs Farm, south- 
east of Shilton, where some of the beds are perforated by 
Lithodomus ; he also refers to other sections near Black Bourton 
and Marsh Hadden.* (See Fig. 132, and p. 371.) 
* Geol. Cheltenham, p. 74 ; and Geol. parts of Oxfordshire and Berkshire, p. 4. 
