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although it possesses some species in common with the zone 

 of Ammonites communis below, and that of the Ammonites 

 Murchisonoe of the Inferior Oolite above; still it contains a 

 fauna sufficiently numerous in specific forms, that are special 

 to it, to justify its separation from the lower zone. Most of 

 the Ammonites found in the upper zone belong to the group 

 Falciferi, and a few are common to both : the group Lineati 

 is represented by one remarkable species the Am. Jurenses, Ziet., 

 which is special to the upper zone, and from whence its name is 

 derived. 



I. — The zone of Ammonites communis is seen in the escarpments 

 of the Cotteswold Hills, and on the summits of Bredon, Alderton, 

 Gretton, and Churchdown Hills, all outliers from the main 

 chain; it consists of: — 



1. — Brown marly clays of variable thickness according to the 

 amount of erosion. 



2. — Bands of nodular argillaeeous Limestone from 6 to 8 iadhes 

 in thickness, called the "Fish-bod," containing fine speci- 

 mens of Pachycormus, Leptolepis, Tetragonolepis, &c., with 

 the wings of Neuroptera, as Lihellula Brodiei, and elytra of 

 Coleoptera. 



3. — Bluish mottled clay, more or less laminated, containing 

 Cerithium, Bostellaria, Trochus, Natica, and of Conchifera 

 Aral, Leda, Posidonomya. 



4. — Brachiopoda bed, with Leptcena, Spirifer, Terehratida. 



5. — Blue clay, with Ammonites falci/er, Sow., Am. communis, Sow., 

 Ain. bifrons, Am. serpentinus. 



Fauna of the Ammonites communis Zone, GiiOtrcESTEKSHiEE. 

 Reptilia. 



Teleosaunis. Plesiosaurus. 



Ichthyosaurus. Pterodactylus (coracoid of). 



Fishes. 



Pachycormus latirostris, Ag. Tetragonolepis discus, Egerton. 



Leptolepis concentricus, Egerton. Dapedius, Sp. 



Ceustacea. 

 Colea, Sp. 



