112 Glacial and Loessial Soils. 



in a disorderly mass. Derived from iin^tratified glacial drift. 

 Glacial bowlders are found here and there on the surface, in some 

 areas so plentiful as to interfere with cultivation. These are fre- 

 quently removed from the fields. Occupies gently undulating to 

 rolling country and covers wide areas in the prairies of the North- 

 west. While extensive areas are well drained and well suited to 

 farming, there are areas of obstructed drainage, resulting in bogs, 

 ponds, and swampy depressions, which are unfit for cultivation 

 without artificial drainage — often a difficult problem. The soil is 

 above the average for general farming purposes. AVheat, oat", 

 corn, barley, and flax are the principal crops. "Wheat yields from 

 10 to 30 l)ushels; oats from 20 to 80. with an average of 40 bushels; 

 corn from 25 to 45 bushels; barley about 30 bushels; and flax from 

 9 to 12 bushels per acre. Millet is grown to some extent for hay, 



Yielding from 3 to 4 tons per acre. 



1 



Soil (22) 11 



Subsoil (23) 11 



Acres. 



Brookings, S. Dak 135, 808 



Cerro Gordo County, Iowa 242, 112 



Grand Forks, N. Dak « 12, 352 



Acres. 



Jamestown, N. Dak 206, 976 



Marshall , Minn 108, 352 



Story County, Iowa 303, 808 



Marshall silt loam. — Dark-brown to black silt loam 10 or 12 inches 

 deep, resting usually on a light-colored, sometimes mottled, silty 

 loam or silty clay. Lime concretions frequently occur. Varies in 

 topography from level to rolling and hilly. Derived from glacial 

 drift or loessial deposits. Drainage generally good but not excess- 

 ive, the subsoil retaining moisture well and crops resisting drought 

 to a marked degree. Fine soil for the production of wheat, corn, 

 oats, alfalfa, tobacco, and sugar beets, where climatic conditions 



are favorable. 



1 



Soil (32) 3 



Subsoil (31) 2 



Acres. 



Clinton County, 111 ^57, 472 



Grand Island, Nebr 137, 984 



.Jamestown, N. Dak 41, 280 



Janesville, Wis '■Sl,344 



Knox County, 111 289, 08s 



Acres. 



McLean County, 111 574, 720 



Sangamon County, 111 832, 224 



Stanton, Nebr 102, 720 



St. Clair County, 111 '' 106, 432 



Winneba,ero County, 111 90, 624 



" Mapped as Fargo loum, which name will not be used hereafter. 



'' Mapped as Miami silt loam. 



<■ Mapped as Janesville silt loam, which name will not be used liereafter. 



