Geology and Mineralogy. 305 



Bulletin No. 149, Bibliography and Index of North American 

 Geology, Paleontology and Mineralogy for 1896, by F. B. 

 Weeks, contains 152 pages. The bibliography consists of papers 

 and references classified by authors. In the index the classifica- 

 tion is by subject and thus rendered especially useful. 



The following folios have been issued : 



No. 31. Pyramid Peak, Colorado, by W. Lindgren. 



33. Briceville, Tennessee, by Arthur Keith. 



34. Buchanan,West Virginia, by J. A. Taff and A. H. Brooks. 



35. Gadsden, Alabama, by C. W. Hayes. 



36. Pueblo, Colorado, by G. K. Gilbert. 



37. Downieville, California, by H. W. Turner. 



The Pueblo Folio of Colorado was prepared for laymen as well 

 as geologists, and is an excellent model of its kind. The struc- 

 ture of the western edge of the great plains is well shown and its 

 geological development described. Among the novel features 

 are tepee buttes, whose form suggests the name and whose origin 

 is ascribed to limestones standing vertically in the Pierre shales. 

 A special sheet illustrates the deformation of the Dakota sand- 

 stone. Being very porous, this sandstone is the chief reservoir 

 for underground water. The water resources are shown by a 

 map upon which the areas yielding flowing wells and pumping 

 wells are distinguished, and by contours the depth is indicated at 

 which the water will be found. 



Recognizing the important bearing of the hydrographic inves- 

 tigations in charge of N. H. Newell upon the agricultural 

 resources of much of the western country, the work and publi- 

 cations in that line have been greatly extended. Besides the 

 forthcoming Part iv of the Eighteenth Annual, which is devoted 

 exclusively to hydrography, a series of twelve water-supply 

 papers have been issued discussing the probabilities and. methods 

 of using to greatest advantage the water-supply of certain dis- 

 tricts. J. s. D. 



2. The Gold fields of Alaska. — Three important contributions 

 to the knowledge of the mineral resources of Alaska have been 

 recently prepared by the United States Geological Survey.* 

 Using these as his chief sources of information, Mr. S. F. Emmons 

 has now prepared a pamphletf to accompany a map of Alaska 

 showing the known gold-bearing rocks. 



* 1. Coal and Lignite of Alaska, by W. H. Dall. 11th Ann. Kept. U. S. G-eol. 

 Survey, Pt. 1. Washington, 1896. 



2. Reconnaissance of the Gold fields of Southern Alaska by Geo. F. Becker. 

 18th Ann. Kept U. S. Geol. Survey, Part Hi, pp. 1-86. Washington, 1898. 



3. Geology of the Yukon Gold District, Alaska, by J. E. Spurr with introduc- 

 tory chapter by H. B. Goodrich. Ibid., pp. 101-391. 



f Map of Alaska showing known gold-bearing rocks, with descriptive text con- 

 taining sketches of the geography, geology, and gold deposits and routes to the 

 gold fields, by S. F.. Emmons, pp. 1-44. U. S. Geological Survey, Washington, 

 1 898. The base used for the geological map is a part of chart T of the U. S. 

 Coast and Geodetic Survey. Edition of June, 1897. 



Am. Jour. Sci.— Fourth Series, Vol. V, No. 28.— April, 1898. 

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