Reports and Proceedings — Geological Society of London. 133 



Corallian. 



Oxfordian. 

 Callovian. 



North District. 

 Pterocerian. 

 Astartian. 



Calcaire a Nerinees. 

 Oolithe Corallienne. 

 Terrain a chailles siliceux. 

 'I'errain a chailles marno-calcaire. 

 Calcaire a Scyijhies inferieur. 

 Le far sous-Uxfordien. 

 Zone of Anim. macrocephalus. 



Bathonian. 



Dalle nacree, etc. 



South District, 

 Pterocerian. 

 Astartian. 



Corallian. 



Pholadoraian. 



Spongitian. 



Superieur. 



Inferieur. 



Dalle nacree. 



Oxfordian. 

 Callovian. 



Some of the lithological and palaeontological differences between 

 these rocks and the English Oolites were noticed, and the views of 

 Oppel, Marcou, Waagen, Blake, and Eenevier, as to the relations of 

 the beds in the two countries, were commented upon. The author 

 then proceeded to compare the fossils of the Swiss Jurassic beds 

 with those of their English representatives, stage by stage, and 

 finally suggested the following correlation : — 



ENGLAND, 

 f Upper. 



PuRBECK. < Middle. 

 1 

 I. Lower. 



Portland stone. 



„ sand, etc. 

 Upper Kimmeridge Clay. 



r Clays with Exogyra virgula. 

 Q I ,, ,, AmvionUes alieryians. 



^ S j Clays with Asiarte supracoral- 



i2 ! ,, ,, Ostrea deltoidea. 



Kimmeridge passage-beds. 



Cornbrash. 



JURA. 

 Valangian. 



Purbeckian. 



Portlandian. 



Virgulian. 



Pterocerian. 



Astartian. 



Calcaire a Nerinees. 

 Oolithe Corallienne. 



Terrain a chailles sili- 

 ceux. 



Pholadomian. \ 

 Spongit: 



ian. ) 



Oxfordian. 



Le fer sous-Oxfordien. 



Zone of ATHin. macroce- 

 phalus. 



Bathonian. 



