IV. 

 STRATIGRAPHIC RESULTS. 



The Jurassic fauna of Cape Flora is distinguished by the prominent part 

 which the Ammonite genus Cadoceras plays in its composition. One species, 

 Cadoceras Nanseni n. sp. allied to Cadoceras Tchefkini d'Orb. sp., is 

 represented by a particularly large number of specimens. In addition to 

 Cadoceras, the two genera Quenstedtoceras and Macrocephalites must be 

 mentioned as being stratigraphically most important representatives of the 

 Ammonites in our fauna. 



The occurrence ot these three genera of Ammonites proves that the 

 marine fauna of the Jura of Cape Flora contains representatives of the 



Callovian.^ 



Are other horizons of marine Jura than the Callovian possibly represented 

 at Cape Flora? 



More recent marine horizons have certainly not been formed at Cape 

 Flora, as far as I can judge from the collection of fossils before me. 

 The absence of the Lamellibranch genus Aucella, which is peculiarly charac- 

 teristic of the Upper Jurassic strata of northern regions, would be sufficient 

 to 'prove that the Oxfordian^ and all more recent Jurassic horizons do not 

 occur as marine deposits at Cape Flora. Not only Aucella, but all other 

 forms characteristic of the higher Jura, are absent. 



The question whether marine Jura deposits older than the Callovian are 

 developed at Cape Flora, demands a careful discussion, which will follow below. 



1 The term Callovian is here always used in the sense in which the German, French 

 and Russian authors use it. I write Callovian and not "Kellaway", in order to avoid 

 the confusion of our Callovian with the non-identical "Kellaways Rock" of English 

 authors. 



2 "Oxfordian" again in the sense in which the German, French and Russian geologists 

 use the term, not equivalent with the "Oxford Clay" of English authors. 



