THE ORIGIN OF GUMBOTIL 

 TABLE II 



117 



B. Chemical analyses of Kansan gumbotil, oxidized and leached Kansan till, and 

 oxidized and unleached Kansan till, from cut on the Chicago, Milwaukee & St. Paul 

 Railway, at mile 372, one mile west of Murray, Clarke County, Iowa. 



TABLE III 



C. Chemical analyses of Nebraskan gumbotil, Nebraskan oxidized and leached till, 

 and Nebraskan oxidized and unleached till, from cut on the Chicago, Milwaukee & 

 St. Paul Railway one and one-half miles west of Manning, in the southwest one- 

 quarter of section 18, Warren Township, Carroll County. 



Table V shows the comparative results of the chemical analyses 

 of "A," "B," "C," "D." 



Discussion of the chemical data. — The three localities "A," ^'B," 

 and "D" show the gumbotil underlying loess or loesslike clay 

 covered by a thin layer of soil. At "C" the Nebraskan gumbotil 

 lies below soil with no intervenmg loess or loesslike clay. The 



