354 



Geological Society : — 





NEWER PLIOCENE. 





Cbomebian. 



So-called Forest-bed Series. 

 (Freshwater & Estuarine.) 

 Zone of Elephas meridionalis. 





Weyboubnian. 



Wey bourn and Belaugb Crag. 

 Zone of Tellina balthica.. 

 (Marine.) 



Chillesfobdian. 



Chillesford Clay and Sand. 

 Zone of Leda oblongoides. 

 (Estuarine.) 



ICENIAN. 



Norwich Crag. (Marine.) 



Northern part : 



Zone of Astarte borealis. 

 Southern part : 



Zone of Mactra subtruncata. 



Butleyan. 



Red Crag of Butley and Bawdse} - . 

 Zone of Cardium grcenlandievm. 



AntSTELIAN. 



Upper part. 

 Lower part. 



Newboubnian. 



Red Crag of Sutton, Newbourn, 

 Waldringfield, etc. 

 Zone of Mactra constricta. 



? 



Red Crag of Bentley & Tattingstone. 



Waltonian. 



Crag of Essex. 



Oakley horizon : 



Zone of Mactra obtruncata. 



Walton horizon : 



Zone of Neptwrusa contraria. 



PoEDEBLIAN. 



SCALDISIAN. 



Zone a Trophon 

 antiquum (Chryso- 

 domus contraria). 



Gedgbavian. 



Coralline Crag. 



Zone of Pecten G-erardii. 



Casteelian. 

 Zone a Isocardia 

 cor. 



OLDER PLIOCENE. 



. Lenhamian. 



Leuham Beds. 



Zone of Area diluvii. 



Boxstone fauna. 



DlESTIAN. 



Ferruginous sand- 

 stones of Diest. 



Waenrode Beds. 



the littoral accumulations of a sea retreating, not continuously, but 

 at intervals, in a northerly direction. 



A new horizon of the Crag, represented by some beds at Little 

 Oakley, between Walton and Harwich, is described, indicating the 

 period, before the southern mollusca had commenced to disappear, 

 when a few boreal species were beginning to establish themselves in 

 greater or less abundance in the Anglo-Belgian basin. Though 

 hitherto unnoticed, the fauna of this locality has proved to be ex- 

 ceedingly rich, more than 350 species and varieties having been 



