REVIEWS 401 



ing this general treatment each of the individual streams is discussed 

 in greater detail. 



The next paper is by Professor C. S. Prosser upon "The Upper 

 Permian and the Lower Cretaceous." Professor Prosser's work upon 

 the Permian of Kansas is well known, and that portion of the present 

 paper devoted to the Permian is but a supplement to what he has 

 previously published. The "Red Beds', or Cimarron Series come in 

 for consideration here. These beds have been placed by different 

 workers in the Permian, Jura-Trias and Cretaceous. The entire 

 absence of fossils in the series in Kansas makes their correlation at 

 best uncertain. The presence of Permian fossils in the "Red Beds" 

 of Texas, however, which have a similar position but differ lith- 

 ologically, the seeming conformity with the true Permian below and the 

 marked unconformity with the Cretaceous above, point to the Permian 

 or Triassic age of the series, but Professor Prosser states that the cor- 

 relation of the beds with either the Permian or the Triassic is as yet 

 a matter of uncertainty. The second part of Professor Prosser's report 

 is upon the Lower Cretaceous, which is represented in Kansas by the 

 Washita division of the Comanche Series. The stratigraphy of the 

 formation is discussed in detail, many sections and lists of fossils 

 being given. 



A chapter on "The Upper Cretaceous of Kansas "is contributed 

 by W. N. Logan. The series is well represented in western Kansas by 

 the Dakota, Benton, Niobrara, and Fort Pierre groups. Each of these 

 formations is discussed in more or less detail. 



The next paper is by Professor S. W. Williston upon " The Kansas 

 Niobrara Cretaceous. This is followed by the " Physical Properties of 

 the Tertiary" by Professor E. Haworth, in which the stratigraphy, lith- 

 ology, origin and mode of formation of the Tertiary is considered. 

 "The McPherson Equus Beds" are described by Professor Haworth 

 and J. W. Beede. These beds have been considered as of glacial 

 origin. This explanation of their origin is disputed by the authors 

 and they state that no satisfactory interpretation of them can as yet be 

 advanced. The last chapter in the volume is by Professor Williston 

 upon "The Pleistocene of Kansas." The deposits of this age are 

 treated briefly and mention is made of the various vertebrate remains 

 which have been found in them. S. W. 



