Or THE SWISS JUKA AND ENGLAND. 



249 



a Nerinees and Oolithe corallienne. From an analysis of the fossils 

 it appears that of the 62 species recorded (Jaccard, op. cit. p. 199) 

 from the Astartian marls of the south district, 35 occur in the same 

 beds in the northern district, whilst 8 only have been found in the 

 CaJcaire a Nerinees, and 3 of these range up into the Astartian. 

 There are therefore only 5 species which connect the Calcaire a 

 Nerinees with the lower division of the Astartian in the Central Jura. 

 From these considerations it seems probable that these Astartian 

 beds represent palaeontologically but little, if any, of the upper 

 portion of the Corallian in the northern Jura. 



Table of Correlations of the Upper Jurassic in the 

 North and Central Jura. 



Northern District. 



Southern District. 



Purbeckian. 



Purbeckian. 



Portlandian. 



Portlandian. 





Pterocerian. 



Pterocerian. 



Astartian. 



Astartian. 



/ Calcaire a Nerinees. 



a Oolithe Corallienne. 



o 

 O 



Terrain a chailles sili- 

 ceux. 



•a 



o 



''Terrain a chailles mar- 

 no-calcaire. 



Calcaire a Scyphies in- 

 ferieur. 



V 



& ! 

 cs 



( Le Fer sous-oxfordien. 



~ j Zone of Am. macroce- 

 O \ phalus. 



satho- i Dalle nacree, &c. 

 nian. \ 



Q.J.G.S. No. 170. 



Corallian. 



Pholadomian. 



Spongitian. 



Superieur. 



Inferieur. 



Dalle nacree. 

 s 



O 



■ o 



1 § 



