4 University of Kansas Geological Survey. 



ence to it can only be guessed at. Nevertheless, it is distinct 

 enough to show that, in the Kansas area at least, there is no 

 abrupt change in the faunas of the upper and lower parts of 

 the Coal Measures, though the statement has been made that 

 " the change in faunal features is striking." 1 



The upper limits of the Coal Measures, as defined by Prosser, 

 are followed in this report. 



The fauna of the Coal Measures of Kansas presents some 

 very interesting and important features. The vertical range 

 of species is very great for both brachiopods and pelecypods. 

 The fauna also seems to be a young one in some respects, 

 though, as a whole, it is certainly that of the Coal Measures. 

 There are several species ranging through it which are charac- 

 teristic of the English Permian, some of them being even 

 restricted to the lower portion. This would not be so very 

 remarkable were they all brachiopods, but several of them are 

 pelecypods. 



For the area and thickness of the Coal Measures, the reader 

 is referred to Volume III of these reports. 



The writer wishes to gratefully acknowledge the kind assist- 

 ance of Dr. S. W. Williston in many ways in the preparation of 

 this report ; also to thank Prof. Charles S. Prosser, of the Uni- 

 versity of Ohio, and Mr. Charles Schuchert, of the United States 

 National Museum, for the loan of many valuable specimens and 

 for offering many valuable suggestions and encouragement in 

 the work. To Mr. Austin F. Rogers, of the University, much 

 credit is due for assistance. The drawings for the illustrations 

 accompanying this article were made by Mr. Sydney Prentice.. 



1. Keyes, Amer. Geol., xxiii, p. 303, 1899 (May). 



