FOSSILS OF GREAT OOLITE. 253 
Ward ;* and some Ostracoda have been found. Foraininifera also 
occur. The fossils on the Stonesfield Slate are noted on pp. 296, 
314. 
In some respects the fauna of the Inferior Oolite is repeated in 
the Great Oolite, excepting in a marked degree the Cephalopoda. 
Terebralula maxillata (often termed submaxillata), so abundant 
in the Oolite Marl of Stroud, is one of the prevalent fossils 
of the Great Oolite : so also Rhynchonella concinna occurs in 
both Great and Inferior Oolite. Of the Lamellibranchs common 
to the two formations, there are similar species of Area, Astarte, 
Cardium, Ceromya, Corbula, Cypricardia, Gcrvillia, Hinnites, 
Lima, Lucina, Modiola, Myacites, Nucula, Ostrea, Pecten, Phola- 
domya, Trigonia, Unicardium, &c. 
Mr. Hudleston has remarked that the Gasteropod fauna of the 
Great Oolite at Minchinhampton, has far more resemblance to 
that of the Inferior Oolite which underlies it, than it has to the 
Gasteropod fauna of the Inferior Oolite in the Dorset district.f 
This may perhaps be accounted for by the thinness of the Fuller's 
Earth in this region an attenuation which may imply a shorter 
duration of clayey conditions (see p. 151), so as to bring nearer 
together the conditions attending the Inferior and Great Oolites. 
Lithologically some beds of white oolite in the Inferior Oolite 
near Minchinhampton are precisely like beds in the Great Oolite 
at the same locality. 
Again the shelly beds belonging to the Lincolnshire Limestone 
at Great Ponton and other places, have yielded a number of 
species that are found also in the Great Oolite. The following 
Oasteropods are common to the two formations : 
Actseon Sedgvici. 
Bourgnetia elegans. 
Cerithium quadricinctum. 
Cylindrites turriculatus. 
Emarginula scalaris. 
Exelissa pulchra. 
Monodonta Lyelli. 
Natica hulliana. 
Nerinaea Eudesi. 
Patella rugosa. 
Pseudomelania Lonsdalei. 
Purpurina elaborata. 
Simula Bloti. 
clathrata. 
tricarinata. 
Trochotoma extensa. 
Trochus Ibbetsoni. 
spiratus. 
Nefita costulata. 
Zones. 
The fossils of the Great Oolite and Stonesfield Slate do not 
lend themselves to particular zonal grouping. Strictly speaking 
the whole of the Great Oolite Series from the Fuller's Earth or 
Fullonian to the Foiest Marble and Great Oolite Clay, belong to 
one zone. We have no constant horizons of Ammonites or 
Belemnites, nor could we expect them in the false-bedded oolites 
that were no doubt rapidly accumulated. 
Terebralula maxillata is not sufficiently restricted in its vertical 
range to be of service ; and in reference to Corals, Mr. Tomes 
* Geol. Mag., J890, p. 529. 
j 1 Gasteropoda of Inf. Ool., p. 70. See also Lycett, Quart. Journ. Geol. Soc., 
vol. iv. p. 181 ; Proc. Cotteswold Club, rol. i. p. 62 ; and Brodie, Quart. Journ. Geol. 
Soc., vol. vi. p. 245. 
