3IarshaU Series. 109 



Miami clay loam. — Light-colored loam, 12 inches deep, underlain 



by a clay loam, which in turn is underlain by bowlder clay at a 



depth of 5 feet. Level plains, except adjacent to the streams. 



Glacial origin. The surface of the country was formerly covered 



by bowlders, which have largely been removed. One of the best 



of soils for general agricultural purposes, especially wheat. 



12 3 4 



Soil (24) 8 20 52 21 



Subsoil (24) 6 19 45 29 



Acres. I Acres. 



Allegan County, Mich al07, 580 I Pontiac, Mich 56, 384 



Columbus, Ohio 222, 336 j Story County, Iowa 3, 072 



Madison County, Ind 232, 640 I Stuttgart, Ark & 69, G96 



Montgomery County, Ohio. . . 240, 000 , Toledo, Ohio 20, 352 



Kiami black clay loam. — {For description see under Marshall series, page 

 113.) 



MARSHALL SERIES. 



The ^Marshall series includes the dark-colored upland soils of the 

 glaciated and loessial region, characterized and distinguished from 

 the INIiami series by a large amount of organic matter, 



Marshall stony loam. — A dark-brown to black loam or sandy 

 loam 8 inches deep, containing considerable gravel and small stones, 

 underlain by a yellow clay loam mixed with gravel and sand. 

 Very little under cultivation. L'sed mainly for grazing, to which 

 it is well adapted. 



12 3 4 



Soil (7) 16 36 34 14 



Subsoil (5) 18 29 31 22 



Acres. 



Brookings, S. Dak 8,256 



Jamestown, X. Dak 30, 208 



Marshall gravel. — Dark-brown to black sandy loam, containing 

 a high percentage of tine gravel. At 15 to 24 inches it grades into 

 a bed of gravel and coarse sand. With the exception of some 

 pasturage afforded early in the season it has little agriculture value, 

 the crops being small and easily affected l)y drought. 



« Mapped as Allegan clay, which name will not be used hereafter. 

 6 While having the same characteristics, the origin is different, and possibly 

 this soil should have been put into some other series. 



