Reviews. 



The Non-Metallic Minerals. By G. P. Mekrill, New York: John 

 Wiley & Sons, 1904. 

 The non-metallic minerals, exclusive of gems, building-stones, and 

 marbles, are treated in groups as elements, sulphides, oxides, etc. The 

 nature and composition, the geological and geographical occurrence, the 

 theories of the origin, and the uses of each mineral are presented, and in 

 the case of the more important minerals commercially a brief description 

 is given of the methods of mining and the preparation for the market. A 

 valuable feature of the book to those who are making a study of special 

 minerals is a bibliography giving complete references to articles and books 

 on the various subjects. The occurrence of minerals, their forms of crystal- 

 lization, and many other features are illustrated by numerous half-tones, 

 diagrams, and geological sections. The author has rendered a most 

 important service to all who are in any way interested in the non-metallic 

 minerals by bringing together in a most concise manner much valuable 

 information which until now was so widely scattered that it could be 

 obtained only with great difficulty. 



G. F. K. 



Geology of Miller County. By Sydney H. Ball and A. F. Smith. 



With an Introduction by E. R. Buckley, Vol. I, Second Series. 



Jefferson City, Mo.: Missouri Bureau of Geology and Mines. 



1903. 

 This is a report of 207 pages with 18 plates and sufficient figures to 

 afford ample illustrations. Two maps accompany the report, the first 

 one a geological map purely, and the second one an economic map showing 

 locations of mines, quarries, clay-banks, etc. Many of the figures consist 

 of detailed columnar sections of the different formations. 



Miller county is located in the midst of the Ozark plateau, and the 

 succession of formations is typical for most of the plateau region. The 

 formations occurring in the county are the Proctor limestone, probably 

 of Cambrian age; the Gunter sandstone. Gasconade limestone, Bolin 

 Creek sandstone, St. Elizabeth formation, Jefferson City formation, and 

 Pacific sandstone, of undifferentiated Cambro-Ordovician age; the undiffer- 



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