PRELIMINARY HANDBOOK OF THE DEPARTMENT OF GEOLOGY. 31 



(11) The Grand Caiion of the Colorado of the West and cliffs of 

 southern Utah. Scale, vertical, 1 iuch=5,000 feet; horizontal, 1 iuch = 

 2 miles, Modeled by E. E. Howell. Size, feet 6 inches by C feet 7 

 inches. Issued by Ward and Howell. 



(12) Eureka District, Nevada. Scale, I inch=l,600 feet or 1 : 19200 ; 

 horizontal and vertical the same. Geology by Arnold Hague, U. S. 

 Geological Survey. Modeled by E. E. Howell. Size, 5 feet 2 inches by 

 5 feet Gi inches. Issued by Ward and Howell. 



(13) Uintah and Wasatch Mountains. Scale, vertical, 1:126720; 

 horizontal, 1 inch =4 miles, or 1:253410. Modeled by E. E. Howell 

 Size, 4 feet 3A inches by 4 feet 5i inches. Issued by Ward and Howell. 



(14) Mount Taylor, New Mexico. Scale, 1 inch = l mile; horizontal 

 and vertical the same. Geology by C. E. Button, U. S. Geological 

 Survey. Modeled by E. E. Howell. Size, 4 feet 3.J inches by 4 feet 3£ 

 inches. Issued by Ward and Howell. 



(15) Henry Mountains, Utah. Scale vertical and horizontal the 

 same. Geology and modeled by G. K. Gilbert, U. S. Geological Survey. 

 Size 3 feet 10i inches by 5 feet 2£ inches. Issued by Ward and Howell. 



(16) Stereogram of the Henry Mountains, Utah, showing the form 

 the country would have if the eroded portions to the top of the Cretace- 

 ous were restored. Vertical and horizontal scale the same. Geology 

 by G. K. Gilbert, U. S. Geological Survey. Size 3 feet 10£ inches by 

 5 feet 3^ inches. Issued by Ward and Howell. 



(17) High Plateaus of Utah. Vertical and horizontal scale the 

 same. Modeled by C. E, Dutton, U. S. Geological Survey. Size, 4 

 feet 9 inches by 4 feet 10 inches. Issued by Ward and Howell. 



(18 and 19) Mount Shasta, California. Horizontal and vertical 

 scale, 1 iuch=2,500 feet. Geology by J. S. Diller, U. S. Geological Sur- 

 vey. Modeled by Victor and Cosmos Mindeleff. Size, 3 feet 4 inches 

 in square. 



SECTION B.— ECONOMIC GEOLOGY. 



Under this head is comprised a large and important exhibit, or series 

 of exhibits, selected to illustrate the economic aspects of geological 

 science and the extent to which the resources of the mineral kingdom 

 have been utilized by man. 



The collections are arranged to show (1) the nature and variety of 

 the mineral resources of the United States and (2) the nature and va- 

 riety of the more interesting and important useful ores and minerals of 

 the world at large. In these collections, as in those of systematic geol- 

 ogy, the specimens with a few exceptions have been selected with the 

 idea of showing as truthfully as possible the average qualities of the 

 material and its mode of occurrence. Care is taken, of course, to pre- 

 sent clean and freshly-broken surfaces whenever possible, and, while 

 exceptionally fine and beautiful materials are by no means excluded, 

 and indeed gladly accepted as rendering the exhibit as a whole more 



