730 



CHARLES S. PROSSER 



nates as the surface rock ; in the last-named, the Coal-meas- 

 ures." ' While the above paragraph is followed by the following 

 " Comparison of general sections " in Russia and the Mississippi 

 valley, which may evidently be regarded as Dr. Keyes's idea of 

 the correlation of the upper Paleozoic rocks of the central United 

 States and Russia. 



Russia. 



Tartaran, Pernio 

 Trias, or Up 

 per Permian, P 3 



Character of Terranes. 



Shales and marls, red and variegated, 

 shaly sandstones; fossils rare: 

 "Red Beds" 



Mississippi Valley. 



Cimarron Series 



Middle Permian, P s 



Lower Permian, P x -b 



Upper Permo-Car- 

 boniferous (base 

 o f original Per 

 mian) CP C 



Limestones, some dolomitic, sepa- 

 rated by calcareous marl 



Shales (only 200 feet thick in Kama 

 Valley) 



Limestone, heavy dolomitic 



(Marion li.) ~| 



? J> Series 



I 

 (Chase li.) J 



Artinsk, CP 



Shales, sandstones, some thin lime 

 stones 



(Neosho) \ 



(Cottonwood) [• Series 

 (Wabaunsee) ) 



Upper Carbonifer- 

 ous, C 3 



Limestones and shales, highly fossil 

 iferous 



Missourian Series 2 



Finally, in his "Recapitulation" it is stated "That while we 

 have in America a great succession of deposits identical in all 

 essential respects to the original Permian of Russia, the two 

 great basins merely had similar histories that are not necessarily 

 connected and doubtless were wholly independent of each other 

 and unrelated." 3 



Dr. Keyes's description and comparison of rocks and faunas 

 apparently support the correlation of the Upper Paleozoic of the 

 Great Plains with the Permian of Russia, providing one follows 



'Jour. Geol., Vol. VII, 1899, pp. 331, 332. 



2 Ibid., p. 332 ; Proc. Iowa Acad. Sciences, Vol. VI, p. 230. 



3 Jour. Geol., Vol. VII, p. 341 ; Proc. Iowa Acad. Sciences, Vol. VI, p. 231. 



