38 C. Sehuchert — Russian Carboniferous and Permian. 



Correlation with America. 



Tscliernyschew regards the McCloud limestone of the 

 Shasta, California, region as the homotaxial equivalent of the 

 Omphalotrochns horizon of the Ural and Timan. Further, he 

 agrees with Professor Smith that this limestone is to be 

 referred to the Lower Coal Measures. The fossils of the lower 

 beds of the Pitt formation " remind one mostly of the Cora 

 horizon of the Ural and Timan. " " As to the analogues of 

 the Schwagerina horizon it is difficult to state anything posi- 

 tively, although the extensive Pitt shales (about 2000 feet) 

 may in part represent these beds of the Ural and Timan" (p. 

 700). Concerning the Robinson beds of Diller he states that 

 " their age is near that of the Ural-Timan Cora zone." 



Regarding Cummins's Texas section, this author says : 

 " With some probability the Canyon and Strawn beds may be 

 considered as analogous to our Ural-Timan Cora horizon, the 

 Cisco and Albany beds to the Schwagerina zone. This is 

 seen in the interesting paleontologic data obtained by Cum- 

 mins and White in the Wichita and Clear Fork beds which 

 overlie the Albany formation. The fauna gathered in the 

 upper portion of the Wichita and in the lower part of the 

 Clear Fork according to its development may be regarded as 

 near that of the Artinsk of east and north Russia " (p. 702). 



According to Prosser's work, Tscliernyschew correlates the 

 Kansas sections as follows : " The Wabaunsee and Cotton- 

 wood beds I have seen while on an excursion in Kansas in 

 1891, the former in the railroad quarry at the station Manhat- 

 tan, and the latter in the Ulrich quarry in the same village. 

 I should prefer to correlate both with the Cora horizon of 

 east and north Russia. The Neosho beds and probably also 

 the lower portion of the Chase series appear to be analogous 

 with the Schwagerina horizon of Russia, and the remainder of 

 this as well as the Marion beds must be regarded as homo- 

 taxial with the Russian Permo-carbon and the lower Permian. 

 Finally, the Wellington and Cimarron beds may represent 

 the lower red colored Permian series of east and north Russia" 

 (p. 703V 



" In Missouri and Iowa the character of the Upper Carbon- 

 iferous sediments approaches the type developed in the Donetz 

 basin,* and as in this region of Russia so in these states the 

 Coal Measures were deposited in a relatively great sea closed 

 toward the east, north, and south, that had connection only in 



* For a detailed exposition of the Lower (Ci), Middle (C 2 ) and Upper (C 3 ) 

 Carboniferous lithological and biological sequence, see Tscliernyschew and 

 Loutonguin, in Le Bassin dn Donetz (Guide des Excursions. VII, Congres 

 Geol. Internat., 1897, Pt. XVI). 



