SOIL COMPOSITION 



TABLE 17. FERTILITY IN ILLINOIS SOILS Continued 



TIMBER UPLANDS, FLAT 



SAND, SWAMP, AND BOTTOM LANDS 



found in the "Great American Bottoms" in southwestern Illinois, 

 are found in the Mississippi Delta farther south. 



The terminal moraine of the Wisconsin glaciation extends from 

 southern Edgar County, Illinois, to the center of Parke County, 

 Indiana, thence in a southeast direction to the north line of Jen- 

 nings County, thence northeast to the south line of Fayette County, 

 and thence to the southeast corner of Franklin County. 



About two thirds of the state lies north of this line and resembles 

 the timber uplands of northeastern Illinois, with a smaller propor- 

 tion of prairie lands and considerable areas of swamp, especially 

 in the Kankakee river basin. 



South of the terminal moraine the state is largely loess covered, 

 and resembles the timber lands of southern Illinois, except for a 

 central area of residual soils in Monroe, Lawrence, Martin, Orange, 

 Washington, Warrick, DuBois, Crawford, and parts of most 

 adjoining counties. 



In the 1907 Report of the Indiana Geological Survey, Mr. 

 Robert E. Lyons gives data from which the following table is 

 derived : 



