38 University of Texas Bulletin 



confirms our opinion expressed above, i. e., that the cephalopod-bear- 

 ing sandstone of the Artinsk is most probably represented by the Hess 

 limestone as it is certainly older than the zone of Perrinites and 

 younger than that of Uddenites. 



The faunas so far discussed here are those which contain a great 

 number of ammonoids, but there is known quite a number of localities 

 where at least a few ammonoids have been found, and it will be inter- 

 esting to see if we can establish the relation in age between these strata 

 and those of the Glass Mountains. 



The most important of these is probably that of Mrzla-Vodica in 

 Croatia. The sandy, micaceous, argillaceous shales of that locality 

 contain the following ammonoids : 



Gastrioceras Boemeri Gemm.( ?) 



Adrianites elegans Gemm. 



Adrianites isomorphus Gemm. 



Adrianites Haueri Gemm. 



Stacheoceras sp. 



Medlicottia ( ?) croatica Vogl. 



Propinacoceras Galilaei Gemm. sp. 



Paraceltites Hoeferi Gemm. 



There can be no doubt that the fauna corresponds to some part of 

 the Sosio beds although the highly developed Cyclolobinae are missing ; 

 the presence of three Adrianites, of a Gastrioceras belonging to the 

 group of G. Zitteli, and of Paraceltites is quite decisive. It is thus 

 nearly certain that this horizon corresponds to our zone of Waageno- 

 ceras (Word formation). 



Kossmat'^ has already pointed out the somewhat surprising circum- 

 stance that those strata which contain an undoubtedly Permo-Carboni- 

 ferous fauna are developed in a sandy-shaly facies quite similar to 

 that of the Auernigschichten of the upper Carboniferous in the Carn- 

 ian and Julian Alps, while in these latter parts the Permo-Carbonifer- 

 ous is represented by the light-colored Trogkofel limestones. The 

 brachiopod fauna of these limestones described by Schellwien makes it 

 evident that they really belong to the Permo-Carboniferous although it 

 does not allow the exact determination of the horizon; but the oc- 

 currence of Popanoceras and Tlialassoceras in the Trogkofel limestone 



^N. Jahrb. f. Min., 1915, I, p. 413. '. ' 



