114 GEORGE F. KAY AND J. NEWTON PEARCE 



The kinds of materials analyzed and the localities from which 

 they were taken. — ^The kinds of materials analyzed and the localities 

 from which the materials were taken are as follows: 



A. Kansan gumbotil, and oxidized and leached Kansan tiU, from cut on the 

 Chicago, Milwaukee & St. Paiol Railway, about one mile east of Foster in 

 the southeast corner of Monroe County, Iowa. 



B. Kansan gumbotil, oxidized and leached Kansan till, and oxidized and 

 unleached Kansan tiU, from cut on the Chicago, Milwaukee & St. Paul 

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



C. Nebraskan gumbotil, Nebraskan oxidized and leached tUl, 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, CarroU County. 



D. lUinoian gumbotil, oxidized and leached lUinoian tiU, and oxidized and 

 unleached Illinoian tiU from bluff north of Fort Madison, Lee County, Iowa. 



The complete sections at each of the foregoing localities have 

 already been given in this paper, but it seems well to bring them 

 together here in relation to a discussion of the chemical analyses 

 of materials : 



A. Section in cut on the Chicago, Milwaukee & St. Paul Railway, about 

 one mile east of Foster, in the southeast corner of Monroe County, Iowa: 



Feet Inches 



5. Soil, black, porous 2 



4. Loesslike clay, chocolate-colored, leached . . . . i 6 



3. Loesslike clay, light-colored, grayish, on dry 

 surface looks like gumbotil, has chocolate- 

 colored stains, sticky when wet, contains a few 

 small siliceous pebbles, leached 5 6 



2. Gumbotil (Kansan), gray-colored, in lower 

 part chocolate-colored; few pebbles; starchlike 

 fracture when wet; leached 12 



I. Glacial tiU (Kansan), brown in color, with 

 very irregular patches of gray-colored till 

 resembling gumbotil; dry surface of the till 

 is brownish-yellow; damp surface is chocolate- 

 colored; few pebbles; leached to base of cut . . 5 



