408 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 29, 



No. ft. in. 



1. Gryphcea-bed ; a hard ferruginous clay, which broke 



into fragments, and contained many specimens of 

 Gryphma obliquata, Sow 3 ft. to 4 



2. Coral-band ; a thin seam of lightish- coloured unctuous 



clay, containing a great many small sessile Corals 

 (Thecocyathus), most of which appeared to have been 

 attached to the valves of Gryphites 1 inch to 1{ 



3. Hippopodium-bed ; a stiff dark-coloured clay, in some 



parts ferruginous, and containing Gardinia Listeri, 

 Sow., and Hippopodium ponderosum, Sow., in con- 

 siderable numbers from 8 ft. to 10 



4. Ammonite-bed ; a dark ferruginous clay, containing ^ 



selenite and the peroxide and sulphuret of iron, and 

 a great number of the brood of Ammonites, highly 

 pyritic, likewise Am. raricostatus, Am. armatus, and 

 the other species of the list J 



In the parish of Cleeve near Cheltenham the same beds were 

 formerly worked for brick-earth, and the finest specimens that I 

 have collected of Gardinia Listeri, Sow., Hippopodium ponderosum. 

 Sow., Ammonites raricostatus, Ziet., and Pleurotomaria Anglica, 

 Sow., were obtained therefrom. In the railway- cutting at Bredon 

 the same beds were likewise cut through, and yielded a rich series of 

 the characteristic fossils. In Warwickshire the railway-cutting at 

 Honeybourne exposed the same beds ; and here likewise the coral- 

 band contained a considerable number of Thecocyathus rugosus, Wr. 



At Lyme Regis in Dorsetshire this zone is found near Black Yenn. 

 Some of the beds contain a considerable quantity of pyrites, so 

 much so, that during the winter months they are worked for that 

 mineral, when their characteristic Ammonites are collected in con- 

 siderable numbers ; unfortunately they are so much charged with 

 pyrites that they are preserved with difficulty. 



At Robin Hood's Bay, on the coast of Yorkshire, this zone is seen 

 resting on the underlying clays with Ammonites oxynotus, and over- 

 lain by thick clays containing Ammonites Jamesoni, Sow. In all 

 these localities there appears to be an absence of limestone-layers ; 

 clay, more or less impregnated with iron, constitutes the entire beds. 



Fossils of the Zone of Ammonites raricostatus. 



Belemnites acutus, Mill. 

 Nautilus striatus, Sow. 

 Ammonites raricostatus, Ziet. 



armatus, Sow. 



armatus densinodus, Querist. 



nodulosus, Buck. 



Guibalianus, oV Orb. 



mutieus, oV Orb. (?) 



Pleurotomaria similis, Sow. 

 Trochus imbricatus, Sow. 

 Ostrea, n. sp. 



Gryphasa obliquata, Sow. 

 Cardinia Listeri, Sow. 

 Hippopodium ponderosum, Sow. 

 Anomya pellucida, Terq. 

 Unicardium cardioides, Phil. 

 Myacites, sp. 



Ehynchonella variabilis, Schloth. 

 Terebratula numismalis, LamJc. 

 Pentacrinus scalaris, Goldf. 

 Thecocyathus rugosus, Wr. 



§ IY. Conclusion. — From the preceding observations it appears 



