720 CHARLES S. PROSSER 



described : Bakewellia Gouldii, Conocardium oklahomae?isis,Avicv- 

 lopecten Van Vleeti and Dielasma Schucherti; Avicidopecten occi- 

 dentcdis is identified and, generically, specimens of Naticopsis, 

 Plenrotomaria, Schizodus, Lima and Pleurophorus, all of which are 

 from White Horse Springs, Oklahoma. Dr. G. I. Adams also 

 states that Dr. Williston considers the vertebrate remains from 

 the Harper sandstone "as equivalent to Cope's Lower Permian 

 fauna from the Wichita beds of Cummins in northern Texas." " 

 He further said, in discussing the age of the Red Beds of eastern 

 Oklahoma, that "The age of that portion of the Red Beds which 

 is in strike with the Permian of Kansas may confidently be 

 expected to be found to be of Permian age. This is in accord- 

 ance with the evidence already furnished by the vertebrate 

 fossils. Above the Permian limestones in Kansas occur the 

 Wellington shales, which are bluish and greenish-gray in color. 

 They are probably represented southwestward by formations 

 which are red. The succeeding formations are typical Red Beds, 

 and have thus far yielded only Permian fossils." 2 



In a discussion of the "Relations of 'Upper Permian' to 

 Triassic " Dr. Keyes has stated that " Prosser has been led to 

 believe that the greater part of the Kansas ' Red Beds ' are 

 Triassic." 3 The above statement is erroneous, for previous to the 

 publication of Dr. Keyes' paper my discussion of the Cimarron 

 series in the Kansas report appeared under the heading of " The 

 Upper Permian." At that time, however, I did not consider the 

 evidence strong enough to justify their correlation with the 

 Permian without a question. 4 This idea was expressed near the 

 close of the section on "Correlation " in the following sentence : 

 " On account of this dissimilarity in lithologic characters 

 [between the Red Beds of Texas and Kansas] and the absence 

 of fossils in Kansas and northern Oklahoma, together with the 

 fact that there is yet no account of the careful tracing of any 

 part of the Red-Beds across Oklahoma to Texas where their age 



1 Am. Jour. Set., 4th ser., Vol. XII, Nov., 1901, p. 383. 

 2 Ibid., p. 386. 3 Jour. Geol., Vol. VII, July, 1899, p. 339. 



4 See the table of classification in Univ. Geol. Surv. Kansas, Vol. II, Feb., 1897, 

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