564 



APPENDIX. 



Generalized Section for Nebraska. 1 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics. 





Alluvium. 







b 



c3 

 CI 



u 



CD • 



Sand-hills. 





Mainly dunes. 



Loess. 





Fine sandy loam of pale brownish-buff color. 



3 



Glacial drift. 









. Equus beds. 





Gray sands; eolian in part. 



1 fr-* 



o CU 



Ogallala formation. 



150-300 



Calcareous grit, sandy clay, and sand; largely 

 fluvatile. 



i 



CD 



Arikaree formation. 



0-500 



Gray sand with beds of pipy concretions; 

 fluvatile and eolian. 



O * 



9 



Gering formation. 



0-200 



Coarse sands, soft sandstone, and conglomerate; 

 largely fluvatile. 



CD 

 CD 



Brule clay. 



320-600 



Pinkish clays, hard, and more or less arena- 

 ceous; fluvatile and lacustrine. 



.ft 



o 



Chadron formation. 



30-60 



Pale greenish-gray sandy clay; fluvatile or 

 lacustrine or both. 





' Pierre clay. 



2000 + 



Dark gray and soft; marine. 



3 

 o 



0) 



CD J 



Niobrara formation. 



50 



Chalky limestone and shale; marine. 



2 



Benton shale. 



600 + 



Dark gray or black; marine. 



o 



Dakota sandstone. 



400 



Brown; probably non-marine in part at least. 



ft.d 1 



CD w 



► Permian limestone. 



200 



Buff limestones and shales; marine. 



f.i 



' Cottonwood lime- 

 stone. 



1000 



Massive, of light color. 



Peni 

 van 



Wabaunsee forma- 

 tion. 



Limestones, shales, sandstones, and thin coal- 1 

 beds. | 



Strata nearly horizontal. 

 * Darton, 19th Ann. Rep., Part IV, p. 732, U. S. Geol. Surv.; also Scotts Bluff (Nebraska) folio, 

 U. S. Geol. Surv. 



