C. Schuchert — Russian Carboniferous and Permian. 39 



the west and southwest with that of the widely extended 

 Upper Carboniferous sea of western North America." The 

 Mississippian series "represents the entire lower and in all 

 probability also a portion of the Middle Carboniferous divi- 

 sions of Russia. ... As has been stated above, the Wabannsee 

 beds are to be regarded as near the Cora horizon ; we can not 

 therefore ascribe a younger age to the Des Moines series, and 

 they are in all probability at least in part equivalent to the 

 Omphalotrochus horizon " (pp. 704-5). 



" The Donetz type of sedimentation is still more typical in 

 the profiles of the states Illinois, Ohio, and Kentucky. . . . 

 At present one can only point out that a portion of the Upper 

 Coal Measures of these States in all probability represents the 

 beds of the Donetz basin, which on the basis of the latest 

 researches may be regarded as the analogues of the Artinsk 

 deposits of the Urals." 



Tschernyschew then sums up his conclusions in the follow- 

 ing table : — 



Ural and 

 Timan 



Artinsk 

 deposits 



Schwagerina 

 horizon 



Cora 

 horizon 



California, Nevada, Utah, 

 and Colorado 



Texas and Arkansas 



Shale and shaly lime- 

 stone of the Wasatch 

 Mountains and their 

 pelecypod fauna 



Light colored lime 

 stone of the Upper 

 Carboniferous 



Lower portion of Pitt 

 shale series. Robin- 

 son beds. ? Weber 

 quartzite 



Omphalo- McCloud limestone 

 trochus Upper portion of 

 horizon VVasatch limestone 



Wichita and Clear 

 Fork beds 



Albany and Cisco 

 beds 



Kansas, Nebraska, Iowa, 

 Missouri 



Canyon and 

 Strawn beds 



Marion beds 



Chase beds 



Neosho beds 



Missouri series and 

 Cottonwood beds of 

 Kansas and Nebraska 

 Wabaunsee beds 

 Oread limestone and 

 Osage shales of 

 Kansas 



The series 

 from Garnet 



to Oswego 

 limestones 

 of Kansas 



Des 



Moines 

 beds of 

 Missouri 



In this connection, it may not be amiss to give the opinion 

 of one who has now devoted ten years to a study of American 

 Carboniferous faunas, and who has had the great advantages 

 of the U. S. Geological Survey, — Dr. George H. Girty. 



