REVIEWS 101 



at the other end shall be hubnerite in which the proportions of iron and 

 manganese are the reverse of those given for ferberite. The term wol- 

 framite shall be reserved for mixtures of these molecules ranging between 

 the limits assigned to the two end members. 



In the latter part of the bulletin Schaller gives a detailed discussion 

 of the crystallography of ferberite. A total of 32 forms were determined, 

 12 of which are new for the wolframite group. 



W. B. W. 



Glacier National Park. By M. R. Campbell. U.S. Geol. Survey, 

 Bull. No. 600. Pp. 54, figs. 3, pis. 13. 



This bulletin is one of a series intended for popular use, now being 

 published by the United States Geological Survey. It presupposes no 

 knowledge of scientific geology on the part of the reader, and is intended 

 as a guide to the chief physiographic features of the region. 



The report takes up a score of the principle valleys, giving a brief 

 statement for each regarding trails and camps, adjacent mountains, 

 glaciers, cirques, and other physiographic features of interest. Among 

 these is the Lewis overthrust fault. It can be observed in most of the 

 valleys and is a controlling factor in the topography. A thick block of 

 limestone has been thrust over shales along a fault plane dipping about 

 io°, for a distance averaging not less than 15 miles. The eastern 

 boundary of the park follows closely the edge of this overthrust block. 



What may be considered the culminating point of the continent is 

 found on Triple Divide Peak. Waters falling on this peak reach Hudson 

 Bay, the Gulf of Mexico, and the Pacific Ocean. 



Geologists must regret that the scope of this bulletin was not extended 

 by a few paragraphs on the stratigraphic column exposed in the region. 



W. B. W. 



Useful Minerals of the United States. By Samuel Sanford and 

 Ralph Stone. U.S. Geol. Survey, Bull. No. 585. Pp. 250. 



Two lists of useful minerals in the United States were published more 

 than twenty-five years ago in annual reports of the United States Geo- 

 logical Survey. Many changes in production in recent years require a 

 new compilation and its publication in more available form. 



The plan of the work includes all of the states, and under each is 

 listed the minerals found and the more important localities. To what 

 extent the deposits have been mined is indicated in most cases. Data 



