route near the ] 



Little Blue Rive 



Rocky Mountai 



ins, near Fort L 



of this district : 



briefly the geol 



have been descri 



Along our line of travel, from east to west, 

 from the most recent to older strata. 



From the Little Blue to the forks of Platte River we find no rocky strata. The 

 surface is covered with heavy arenaceous deposits, part of which are Post-Tertiary, ap- 

 parently of the age of the "Bluff" formation, while other portions are perhaps, older, 

 Pliocene-Tertiary. Along Little Blue River, and in the upland toward Platte River we 

 find a .a,-at tlm'kness of « Bluff" or "Loess" formation, which, also, covers the older 

 •< k-I's over extensive areas much further to the east. It is there a buff-colored, or hght- 

 hnelv-nrahH 1 ^irthv aririllo-areiiaceous sediment, uniform throughout the 

 .1™/. Ill „„nHi,u :,L\\ (in,trn,m,la. Ilrlir, Lymnea, &c. 



are more snndv and undulating, and 

 n > exoo auCs 1 were nut'u ed • but 'from above the fort to the forks of Platte River de- 

 ' i r ;,re 1 n (1 ^,haracteristlcallv developed, which may either form the continuation 

 of the Bluff fonnation, or may be of Pliocene-Tertiary age. They consist of an arena- 

 ceous, lMu-brownish, or buff-colored material, of mostly a very fine grain and iu,.rh 



whole thickr 



mts during intervals of its formatioi 



