Upper Jurassic Rocks of the Jura and England. 467 





ENGLAND. 



/ Upper. 



j 



SWISS JURA. 

 Vulangien. 







PURBECK.J mme 



\ Lower. 



1 



Purbeckien. 







Portland stone. 



„ sand, &c. 

 Upper Kimeridge Clay. 





Portlandien. 

 Virgulien. 







' Clays with. Exogyra virgula. 



„ „ Ammonites alternants. 







Lower , 





Pterocerien. 

 Astartien. 





KlMEBIDGE. 



Clays with. Astarte supracorallina. 

 - „ „ Ostrea deltoidea. 

 Kimeridge Passage-beds. 









fSupracoralline. 



""" 



Calcaire a ISe'ringes- 

 Oolithe Corallienne. 







Coral Eag. 



o 



=3 



Coealliax. - 



Coralline Oolite. 



Terrain a chailles siliceux. 



i 



Middle Calcareous Grit. 



* 





Hambleton Oolite. 



Pholadomien.") 



r Oxfordiej 

 Spongitien. J 







1 Lower Calcareous Grit. 







( Clays with cordati Ammonites. 



Le fer sous-Oxfordien. ' 



if 





„ „ ornati Ammonites. 



Oxford J 



CXA-Y. 1 



Zone of Amrn. macroce- 

 phalus. 





Kelloway Rock. 



I 





Cornbrash. 





Bathonien. 





2. " The Physical History of the Bagshot Beds of the London 

 Basin." By the Eev. A. Irving, B.Sc, B.A., P.G.S. 



The Author, in reviewing the position taken up by him, attempted 

 to estimate the value of such palaeontological evidence as exists, and 

 insisted on the importance of the physical evidence in the first place. 

 He gave reasons for considering the evidence of pebbles, pipe-clay, 

 derived materials, irony concretions, percentages of elementary 

 carbon (ranging in the more carbonaceous strata up to nearly 2|°/ ) 

 taken together with the evidence of carbon in combination, as ad- 

 duced in former papers, freshwater Diatoms (now, perhaps recorded 

 for the first time in the Middle and Lower Bagshot), and the micro- 

 scopic structure of the sands and clays, as furnishing such a cumu- 

 lative proof of the fluviatile and delta origin of the majority of the 

 Middle and Lower Bagshot Beds, as can hardly be gainsaid ; while 

 he regarded the wide distribution of the Sarsens, taken along with 

 the absence of such evidence as is quoted above, as indicating, along 

 with the fauna, a much greater areal range formerly of the Upper 

 Bagshot than of the strata below them. 



