Haynes: Fauna of the Upper Devonian in Montana. 29 



Ural. Rhein. North America. 



D.2/3 Clyrnenia Kalk. Clymenia zone. Chemung. 



Upper 



Devonian. D.1/3 Goniatites and Goniatites zone. Portage. 



Cuboides zone. Naples. 



Cuboides zone. Genesee. 



Middle D.2/2 Sp. annossofi and 



Devonian. Stringocephalus. Stringocephalus zone. Hamilton group. 



The Upper Devonian of the western border of the Ural Mountains 

 is divided by Dr. Tschernyschew into two horizons. The upper 

 horizon is correlated with the Clymenia horizon of Enkeberg, Fichtel- 

 gebirge, Saxony, Thiiringerwald, and Cornwall, and is characterized 

 by Clymenia annulata, Clymenia flexuosa, Tornoceras simplex, 

 Spirifer archiaci, Spirifer disjunctus, RhynchoneUa acuminata, Camar- 

 ophoria (Leiorhynchus) siibrenifonnis, Orthis (ScJiizophoria) striatula, 

 etc. The lower zone is correlated with the Goniatites and Cuboides 

 horizons of the Eifel and with the Naples fauna of eastern North 

 America, and contains Goniatites (Manticoceras) intumescens, Tor- 

 noceras simplex, Atrypa aspera, A. reticularis, Spirifer disjunctus, 

 S. conoideiis, RhynchoneUa ( Ilypothyris) cuboides, etc. 



Dr. R. Wedekind^* has recently made a special study of the Upper 

 Devonian stratigraphy of Germany, and has found that it can be 

 subdivided by characteristic cephalopod faunas into six zones. These 

 zones are named as follows, beginning with the uppermost: VI. 

 Gonioclymenia, V. Laevigata, IV. Postprolobites, III. Prolobites, 

 II. Cheiloceras, I. Manticoceras. 



Dr. W'edekind has noted the wide distribution of the Prolobites 

 zone 1 1 16, which he considers is represented by the Three Forks For- 

 mation of Montana. Although he does not include any of his other 

 zones in his correlation with the Three Forks Formation, it seems likely 

 that the Postprolobites zone is also represented, because Clymenia 

 annulata of his zone IV5 is closely related to Platyclymenia americana 

 of the Three Forks Formation. 



Dr. E. Perna^" has recently correlated the Upper Devonian strata 

 of the eastern Ural Mountains, with those of Westphalia (Enkeberg 

 and Balve) and Silesia, and has shown that the upper horizon of 

 Tschernyschew's classification can be divided into four zones, which 



19 Wedekind, K. Gesell. d. Wissen. zu GoUingen, Mathematik-phys. Klasse, 1913. 

 -° Perna, ibid. 



