258 Bibliographical Notices. 



BIBLIOGRAPHICAL NOTICES. 



Preliminary Report on the Oeohgij and Water Resources of Nebraska, 

 west of the One-hundred-and-tkird Meridian. By N. H, Darton. 

 71 pages, with 43 plates and 23 text-figures. 4to. Goverumeat 

 Priuting Office, Washington. ] 9u3. 



This is one (" No. 17 ") of the valuable " Professional Papers " 

 issued by the U.S. Geological Survey, and designed for the supply 

 of information on the geological structure of the country, and the 

 prospect of obtaining underground water by boring, and surface 

 water in large quantity by dams and irrigation. 



The subject-matters in this memoir are treated in the following 

 order : — 



Topography, pp. 9-14. 



Geology, pp. 14-43. The formations taken separately. 



1. General Ge(jlogy of Nebraska, pp. 14-21. 



2. Geology of the region west of the 103rd meridian, pp. 21-43. 

 Underground water, pp. 43-47. 



1. General conditions. 



2. Water horizons. 



3. Deep-seated waters. 



Springs, p. 48 ; Streams, pp. .50-54 ; Irrigation, pp. ,54-62. 

 CUmate, p. 62 ; Timber, p. 62 ; List of Elevations, pp. 62- 6 ; Index, 

 p. 67. 



The limits of the district concerned are first of all defined. It 

 is the north-western part of Nebraska ; bounded on the north by 

 South Dakota, by Wyoming on the west, and by Colorado on the 

 south. The region is a characteristic part of the Great Plains, 

 which extend from the Rocky Mountains eastward. It may be 

 referred to as having originally sloped gently to the east, and, when 

 uplifted in early pleistocene times, the rivers excavated valleys 

 across it, making the chief existing features, portions of the plain 

 remaining as high tablelands between the valleys. 



/^Alluvium. 

 I Sand-hills. 

 Pleistocene •{ Loess. 

 I Drift. 

 yEqaus-hedii. 



j Ogalalla formation (Pliocene). ] 

 Neocene \ Arikaree formation (Miocene). \ — Loup Fork beds. 



[ Gering formation (Miocene). J 

 Eocene f Brule Clay. | —White River group. Tit another ium 



(Oligocene ?) [ Ohadron formation. J robustum, pi. xxxv. 



f Laramie formation. 

 I Pierre Clay. 

 Cretaceous ■{ Niobrara formation. "1 = Montana group. Inoceramuslabiatiis, 

 I Benton Shales. j Schloth., and Ostrea congesta Conrad, 



I Dakota Sandstone. []3l. xxxvi. 



Permian limestone. 

 Carboniferous •{ Cottonwood limestone. 

 Wabaunsee limestone. 



