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PROCEEDINGS OP THE ACADEMY OF 



the same time, as we are strongly inclined to the conclusion that they will prove 

 not merely Tertiary, but about of the age of the lowest beds of the Great Lignite 

 basin, or perhaps a little older, we have therefore placed them provisionally 

 along with the Tertiary beds in the accompanying general section of the Ne- 

 braska rocks. 



In order to give some idea of the nature and order of superposition of the 

 beds of which we have just been speaking, as well as for the sake of comparison 

 with those of the Great Lignite basin, we give below a section taken at the 

 mouth of Judith River, where these beds are least disturbed, and their strata- 

 graphical arrangement can be best seen. 



Section of Fresh-water and Estuary Deposits near the Mouth of Judith River. 



This section embraces all the deposits, as we believe, seen in the Bad Lands 

 of the Judith, in which land and fresh-water shells are known to occur. They 

 appear, as near as could be ascertained, to occupy a local basin in a series of 



[May, 



