734 



CHARLES S. PROSSER 



of the Artinsk and Kungur stages. 1 Sibirzev, in 1896 carefully 

 described the Permian deposits near Nishny-Novgorod on the 

 Volga, together with those of the Permo-Carboniferous farther 

 to the west; 2 while Stuckenberg two years later described in a 

 similar manner the Permo-Carboniferous and Permian formations 

 of the Kama basin. 3 



Since then Dr. Keyes has very clearly summarized the Russian 

 classification of the Upper Paleozoic terranes of eastern Russia in 

 the following table : 4 



Dr. Keyes states that following "the so-called true Carbon- 

 iferous of the Urals ... are the transition faunas to the 

 Permian, according to the Russians, and by them called Permo- 

 Carboniferous. The two members which comprise it contain, as 

 pointed out by Tschernyschew, very nearly the same organic 

 forms, consisting largely of lamellibranchs, gasteropods, and 

 brachiopods. The lower terrane, termed the Artinsk is notable 

 for the ammonites that are found in it, which the author just 

 mentioned compares with those lately found in the Texas 

 Permian 



"The bottom terranes of the Permian, as now recognized by 

 the members of the Russian geological survey, present a great 

 paucity of fossils. The forms are chiefly lamellibranchs, yet in 

 some layers are fragmentary plants. 



"The median part of the Permian carries what has been 

 regarded as the typical German Zechstein fauna. 



* Ibid., Vol. IV, No. 2, Blatt 138, pp. 111-14. 

 2 Ibid., Vol. XV, No. 2, Blatt 72, pp. 242-65. 

 1 1bid., Vol. XVI, No. 1, 1898, pp. 309-21. 

 ■•Jour. Geol., Vol. VII, 1899, p. 330. 



