l6o CHARLES S. PROSSER 



Characteristic floras, found in a brief tentative search of red beds at three 

 points in Colorado and New Mexico, not only prove Permian age but also indi- 

 cate great thickness of Dyas in certain "Red Beds" sections in the Rocky Moun- 

 tains. Examination of lower middle Wichita in Texas and additional collections 

 from Chase (Wreford and Winfield beds) and Wellington of Kansas and from 

 Red Beds within the same limits in Oklahoma confirm lower Permian correla- 

 tions.' 



A recent article by Dr. Austin F. Rogers of Stanford University 

 is important in noting the similar mineral deposits in the upper part 

 of the Big Blue series (Lower Permian) of Kansas and those of the 

 Zechstein (Upper Permian) of Germany, and calling attention to 

 the probable arid climate in the northern hemisphere during Permian 

 time which these mineral deposits indicate also prevailed during that 

 time in Kansas. Dr. Rogers writes as follows: 



The salt and anhydrite occur in the lower Permian. According to Plate V 

 of the report on Kansas salt,^ the salt-beds are between the Wellington and Marion 

 formations. Not a single fossil was found on the saltmine dumps, and this is 

 not strange when we consider the conditions under which these deposits were 

 formed. From evidence gathered in various places it seems certain that through- 

 out the northern hemisphere an arid climate prevailed in the Permian. The 

 poverty of fossils, the occurrence of Red-beds, and the presence of extensive 

 beds of gypsum and salt, all point to the fact that Kansas was like the rest of 

 the northern hemisphere during Permian time. Now the occurrence of anhydrite 

 with the salt is additional evidence that the Kansas Permian is like the Permian 

 (Zechstein) of Germany during which time the salt deposits of Stassfurt, Leopolds- 

 hall, Vienenburg, and Bernburg were formed. At all these localities anhydrite 

 occurs with salt.' 



The following recent letter from Professor P. Krotow of the Uni- 

 versity of Kasan, Russia, who has thoroughly studied the Artinsk 

 and associated formations of Russia, is especially important in giving 

 a brief general account of these formations together with a table 

 showing their correlation with the corresponding ones of western 

 Europe. The letter was written in English in which only two or 

 three minor changes have been made : 



The term Permo-Carbon is used in Europe with two meanings: (i) The 

 French call the Permo-Carboniferous system the united deposits of both systems : 



1 Twenty-second winter meeting, Boston-Cambridge, Mass., December 28-30, 

 1909, p. 24. 



2 Annual Bulletin of the Mineral Resources for igo8. 



3 Am. Jour. Sci., 4th ser., Vol. XXIX, March, 1910, p. 260. 



