University of Texas Bulletin 33 



As I have said above, Karpinsky seems to pay more attention to the 

 similarities of the two faunas than to the discrepancies, although these 

 latter are evidently by far greater than the similarities. 



It is of course extremely dififiicult to decide how great the difference in 

 age is because the two faunas are found in localities separated from 

 each other by an enormous distance ; but the paleontological character 

 of the Sosio beds makes it very probable that they correspond in age 

 at least to the Kungur dolomites of the Ural which cover the ceph- 

 alopod-bearing sandstones of the Artinsk. This is only a supposi- 

 tion, because the Kungur dolomites do not contain ammonoid forms 

 and a direct paleontological comparison is therefore impossible. It 

 may even be that the Sosio beds are still a little younger than the 

 Kungur dolomites but they are certainly not nearly of the same age 

 as the Artinsk sandstone. 



This will appear more evident yet when we compare the faunas of 

 the Artinsk and of the Sosio beds with those of the Glass Mountains. 



A comparison between the fauna of our zone of Waagenoceras 

 (Word formation) and that of Sicily shows at once the intimate rela- 

 tions hetween the two. There is not one genus in our fauna which 

 does not also exist in the Sosio beds, and most of the species have 

 some near relative even in the Sicilian beds, as is shown by the fol- 

 lowing table : 



SPECIES PROM THE WORD FORMATION OP 

 THE GLASS MOUNTAINS 



Medlicottia Burchhardti n. sp. 

 Gastrioceras roadense n. sp. 

 Gastnoceras sp. nov. indet. 

 Paraceltites multicostatus n. sp. 

 ParacelUtes aff. elegans Girty. 

 Affathiceras Girtyi n. sp. 

 Adrianites marathonensis n. sp 

 StacTieoceras Bowmani n. sp. 

 Stacheoceras gilliamense n. sp. 

 Waagenoceras Dieneri n. sp. 



The occurrence of Waagenoceras at both localities is of the greatest 

 importance. While this genus has never been found anywhere else, 

 it is extremely frequent in the Glass Mountains and in the Sosio beds. 

 The occurrence of this genus alone would make it highly probable that 



