OF THE SWISS JURA AND ENGLAND. 



267 



valents of the stages in such widely separated areas, and the lines 

 drawn in the table can, in some cases, only be regarded as approxi- 

 mately correct. 



Table of Correlations of the Upper Jurassic Rocks of the Swiss Jura 



and England. 



ENGLAND. 

 ( Upper. 

 PlTBBECK. -j M j^ to< 

 I Lower. 



Portland stone. 



„ sand, &c. 

 Upper Kimeridge Clay. 



/ Clays with Exogyra virgula. 



LOWEB 

 ElMEEIDGE 



7..! " = 



Ammonites alternans. 



Clays with Astarte supracorallina. 

 L „ Ostrea deltoidea. 



Eimeridge Passage-beds. 



( Supracoralline. 



CORALLIAtf. h | 



Coral Eag. 



Coralline Oolite. 



Middle Calcareous Grit. 



Hambleton Oolite. 



* Lower Calcareous Grit. 



Oxfobd 

 Clay. |' 



Clays with cordati Ammonites. 



„ ornaii Ammonites. 



I Kelloway Eock. 



Cornbrash. 



SWISS JUEA. 

 Yalangien. 



Purbeckien. 



Portlandien. 



Virgulien. 



Pterocerien. 



Astartien. 



Calcaire a Ne'rine'es. 

 Oolithe Corallienne. 



Terrain a chailles siliceux. 



Pholadomien. ") 



r OXFORDIEK. 

 Spongitien. J 



Le fer sous-Oxfordien. 1 

 — — — j 



Zone of Amm. macroce- i 

 yyjialus. j 



Bathonien. 



[Note, April 23. — The fossils from the Lower Greensand of 

 Upware, which have been referred to the genus Nerinoza, include 

 two species figured by Mr. "W. Keeping (Sedgwick Essay for 1879, 

 pi. iii. figs. 7 & 8) and some undoubtedly derived forms (op. cit. 

 p. 45), Since the question of the occurrence of Nerincea in the 

 Lower Greensand of Britain was raised, the two above-mentioned 

 figured specimens have been sliced. The interior of these shells is 

 filled with the deposit in which they were found ; and this, together 

 with their mode of preservation, clearly proves them to be of Lower 

 Greensand age. 



t2 



