38o 



REVIEWS 



Oklahoma Geological Survey Bulletin 22. Part I, "Director's 

 Biennial Report"; Part 11, "Mineral Resources of Oklahoma 

 and Statistics of Production from 1901 to 1914." By C. W. 

 Shannon. 



Bulletin ij. Volcanic Dust in Oklahoma. By Frank Buttram. 

 The great progress in the development of the mineral resources in 

 the state of Oklahoma in the last ten years is made clear by the following 

 statistics: 



VALUE OF MINERAL PRODUCTS OF OKLAHOMA 





1903 



1913 



Coal 



$6,386,463 



142,402 



1,000 



28,150 



9,030 



6,500 



56,140 



4,800 



$8,542,748 

 59,581,948 



7,436,389 



91,416 



30,678 



1,010 



Petroleum 



Natural gas 



Asphalt 



Granite 



Sandstone 



Limestone 



246,912 



12,160 



1,258,676 



330,416 



573,371 



39,457 



548,064 



1,306,368 



259 

 26,231 



5,527 



Line 



Cement 



Gypsum 



Clay products 



Sand and gravel 



234,621 

 534,977 



Lead 





Zinc 





Salt 



Mineral water 



2,070 



Other products 









Total 



$7,406,153 



$80,031,630 



The report is accompanied by maps showing the distribution of the 

 mineral resources in the state, as well as a map showing its physiographic 

 divisions. 



Volcanic dust has been found at widely separated localities in the 

 state. In one place it has a thickness of 9 feet. The dust rests upon 

 formations as young as Pliocene, and is believed to have come from 

 sources 600 miles or more away. R. D. S. 



"A Contribution to the Optical Study of the Amphiboles." By 

 W. E. Ford. Am. Jour. Sci., XXXVII, 179-93, figs. 11. 

 A study with a view to correlating the optical properties of analyzed 

 specimens with their chemical composition. Extinction angles were found 



