CLASSIFICATION OF UPPER PAEZOZOIC ROCKS. 793 
” 
Productive Coal Measures,” to the Permo-Carboniferous group. 
The upper part of the group was correlated with the Artinsk 
stage of Russia. 
This group would include at least the Wabaunsee formation 
of Kansas which contains a fauna practically identical with that 
of the Upper Coal Measures, and as far as the deposits of Kansas 
are concerned there seems to be no reason for considering the 
formation as of Permian or Permo-Carboniferous age. The ‘“‘red 
and gray sandstones and shales of Nebraska City” are correlated 
with the Rothliegendes by Waagen, who clearly regards them as 
younger than the Artinsk stage. Then the ‘red sandstones and 
shales of Texas” containing Vertebrates and Cephalopods, which 
have been described by Cope and White," are referred to the 
lower part of the Magnesian limestone which forms the upper 
group of Waagen’s Permian system. Finally, the “limestones 
and shales, with Pseudomonotis hawni (—speluncaria) of Kansas, 
red gypsum beds of Texas” are regarded as equivalent to the 
remaining portion of the Magnesian limestone group and conse- 
quently represent the upper part of the Permian system. 
It may be said in general in reference to Waagen’s correla- 
tions that so far as the North American deposits are concerned 
he carried the Permo-Carboniferous group too low. If it be 
considered better to put all the beds in either the Carboniferous 
or Permian system, it might be just as well to refer the deposits 
generally called Permo-Carboniferous to the Permian.” If such 
correlation be agreed upon then in Kansas, the line separating 
the Cottonwood and Neosho formations would become the line 
of division between the Carboniferous and Permian systems. In 
the Cottonwood formation is the massive /Fusulina limestone} 
*EDWARD D. Cope: Trans. Am. Phil. Soc., 1888, Vol. XVI., pp. 285-288. 
CHARLES A. WHITE: The Texan Permian and its Mesozoic types of fossils. Bull. 
U.S. Geol. Surv., No. 77, 1891, pp. 39, Pl. IV. 
“In this connection see a paper by Professor James P. Smith on “The Arkansas 
Coal Measures in their relations to the Pacific Carboniferous province” (The Jour- 
NAL OF GEOLOGY, Vol. II., 1894, pp. 187-205). On the “Correlation. Table” at the 
close of the paper (p. 204) the “ Permo-Carboniferous of Kansas and Nebraska” is 
referred to the Permian. 
3The Fusulina limestones of Europe and Asia belong either in the Upper Carbon- 
iferous or lower Permian, hence, the massive Cottonwood limestone with its millions of 
