MAN IX THE MISSOURI VALLEY. 



679 



The only questions as to the glacial age of the relic is 

 whether this remnant of loess belongs to the original deposit 

 connected with the low an stage of glacial recession, or whether 

 it may not have been re-deposited at some later stage of 

 river erosion. Professor Chamberlin maintained that it was 

 a secondary deposit, and that its antiquity "is measured by 



GEOLOGY 



OF THE CONCANNON FARM 



The Region is covered by the lowan Loess 

 With Kansan Drift on the Uplands. 



SCALE 

 One Half Inch = 100 Feet. 

 Fig. 187. 



the time occupied by the Missouri River in lowering its bot- 

 tom, two miles more or less in width, somewhere from fifteen 

 to twenty-five feet, a very respectable antiquity, but much 

 short of the close of the glacial invasion."* But after three 

 visits to the locality, Professor Winchell seems to show con- 

 clusively that the loess belongs to the original undisturbed 



Journal of Geology," October-November, 1902. 



