ii8 



GEORGE F. KAY AND J. NEWTON PEARCE 



TABLE IV 



D. Chemical analyses of Illinoian gumbotil, oxidized and leached lUinoian till, oxidized 

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



TABLE V 



SiO. 



Gumbotil 



Glacial till, oxidized, leached. . . 

 Glacial till, oxidized, unleached. 



Gumbotil 



Glacial till, oxidized, leached. . . 

 Glacial till, oxidized, unleached. 



Gumbotil 



Glacial till, oxidized, leached. 

 Glacial till, oxidized, unleached. 



Gumbotil 



Glacial till, oxidized, leached. . . 

 Glacial till, oxidized, unleached. 



Gumbotil 



Glacial till, oxidized, leached. . . 

 Glacial till, oxidized, unleached. 



72.03 

 7311 



70.46 

 71.84 

 68.56 



71 59 

 66.85 

 66.52 



FeA 



4.i« 

 4.62 



417 



4.62 



4.40 



4-35 

 5-92 

 4.80 



ALO3 



CaO 



■33 

 .66 



1 . 29 

 4.48 



1 . 26 



367 

 4.28 



MgO 



2 . 29 

 2.56 



■55 

 .72 



■79 



0-93 



0.78 



1-43 



71.07 

 72.24 

 72.30 



4.24 

 7-43 

 347 



0.79 

 0.61 

 4-13 



0.8s 

 0.96 



