722 REVIEWS 



The last chapter is devoted to an interesting discussion of the " Condi- 

 tions of Salt Deposition in Former Geological Periods." In this chapter, 

 and indeed throughout the book, attention is directed to the stratigraphic 

 and paleontologic characteristics of the various types of deposits, the 

 object being to prepare the reader for the stratigraphic chapters which 

 are to follow in Volume II. 



The book is a valuable contribution to the science of salt deposits, 

 and should prove of great service to students of economic geology. 



W. T. B. 



Upper Cretaceous Floras of the Eastern Gulf Region in Tennessee, 

 Mississippi, Alabama, and Georgia. By E. W. Berry. United 

 States Geological Survey, Professional Paper 112, Washington, 

 1919. 



The bulk of the flora is from the Tuscaloosa formation, and this paper 

 is devoted principally to its elucidation and is to be regarded as a pre- 

 liminary report, because Professor Berry's work was of a reconnaissance 

 nature. Later, when the abimdant workable clays of the Tuscaloosa 

 formation are developed for economic purposes, many new localities of 

 fossil plants probably will be discovered and additional representatives 

 of its flora. One hundred and fifty-one species, representing eighty-seven 

 genera from the Tuscaloosa formation, are described. The three other sub- 

 divisions of the Upper Cretaceous, the Eutaw formation, the Selma chalk, 

 and the Ripley formation, contributed but meagerly to Berry's collection. 



In comparing the Tuscaloosa flora with the European Upper Cre- 

 taceous floras, Berry finds that eighteen identical species are found in 

 the European Cenomanian, two in the Turonian, and four in the Se- 

 nonian. Therefore, the evidence of the floras is overwhelmingly in favor 

 of the pre-Senonian and pre-Montana age of the Tuscaloosa and allied 

 floras. Thirty Tuscaloosa species are found in the Atane beds of Green- 

 land, and ten in the Patoot beds of the same island. The book is amply 

 illustrated with plates. 



A. C. N. 



The Mineralization of the Copper Shales. By F. Beyschlag. 



Zeitschrift fiir praktische Geologic. January, 192 1. Pp. 1-16. 



In this article Dr. Beyschlag brings forward very cogent arguments 



in support of the view that the famous copper deposits of Mansfield, 



Germany, are not of sedimentary origin, but are younger than the rocks 



