Jan. is, 1917 
Calcium Compounds in Soils 
63 
less pronounced and, the texture is more silty. The type occupies ter¬ 
races above the present flood plain. The soil material is an old alluvial 
deposit derived from drift and modified by weathering on a nearly level 
surface. The type is regarded as a good soil for general farm crops. 
The Chariton silt loam is the same as Grundy silt loam, but lies on river 
terraces. 
CLASS v 
Marshall silt loam. —The surface soil is a dark-brown to black silt 
loam 20 inches deep. The subsoil is a yellowish brown silt loam or 
heavy silt loam usually more compact than the surface soil. Both soil 
and subsoil are calcareous, and lime concretions are abundant. The 
topography is almost level to rolling or hilly. The type is derived by 
weathering from loess. It is an excellent general-farming soil and is 
especially adapted to com. 
Barnes silty clay loam. —This type consists of a dark-brown to 
black silty clay loam underlain by gray to yellowish gray silty clay 
loam. The lower subsoil usually becomes more clayey. The topog¬ 
raphy varies from undulating to rolling. Natural drainage is fairly 
good. This type is derived by weathering from calcareous drift. It is 
a highly productive soil, and the greater part is sown to small grains. 
CLASS VI 
Clyde silty clay. —This type consists of a dark-brown to black 
silty clay 6 to 12 inches deep underlain by a drab or gray and drab 
mottled clay subsoil. The topography is level, and the natural drainage is 
poor. This type is derived from moderately calcareous drift weathered 
under poor drainage conditions. When reclaimed, it is a good soil for 
general farming and dairying. 
class vii 
Crosby silty clay loam. —This type to a depth of 5 to 8 inches is a 
heavy silt loam varying in color from light gray to brownish gray. 
The upper subsoil to a depth of 10 to 12 inches is an ashen-gray to light- 
gray silty loam mottled with spots of yellowish brown clay. The lower 
subsoil is a yellow and gray mottled silty clay passing into a brown, 
tough, compact silty clay. Small iron cbncretions occur on the surface 
and through the soil and upper subsoil. The topography ranges from 
flat to slightly undulating. Natural drainage is imperfect. The type 
is derived by weathering from rather calcareous drift. Oats and hay 
are the chief crops grown on this type. 
Cherokee silt loam. —The soil of this type to a depth of 6 to 12 
inches consists of an ashen-gray floury silt loam. The subsoil is a silt 
loam more compact than the surface material and nearly white in color. 
This extends to a depth of 14 to 18 inches, below which is found a tough, 
waxy, plastic heavy clay of a dark-drab color usually mottled with red. 
The topography is flat to undulating. The natural drainage is defi- 
