SOIL SURVEY OF LOUISA COUNTY, IOWA. 



23 



The Wabash series includes dark-brown to black soils, hio:h in 

 organic matter, underlain by a hcav>^ subsoil ranging in color from 

 dark brown to dark drab or gray, and mottled with yellowish brown. 

 The alluvium has been derived principally from loessial and silty 

 glacial uplands. Excej)t where jirotectcd by levees, the Wa])asli 

 soils are subject to overilow. Natural drainage is well established 

 in some places, but here and there it is rather imperfect. 



The Cass series is characterized by dark-brown to black surface 

 soils, underlain by a lighter textured subsoil. In places the subsoil 

 passes into loose sand or gravel within the 3-foot section, while in 

 other places, after passing through material coarser than the surface 

 soil, it is underlain by heavier textured material. While these soils 

 are subject to overflow unless protected by levees, they are in most 

 cases, owing to the porosity of the subsoil layer, naturally well 

 drained. They differ from the members of the Wabash series in 

 their lighter textured subsoil. 



The following table gives the name and the actual and relative 

 extent of the various soils mapped in Louisa County: 



Areas of different soils. 



Soil. 



Clinton silt loam 



Tama silt loam 



Grundy silt loam 



Muscatine silt loam 



Lindley silt loam 



Wabash silty clay loam . 



Wabash loam 



Waukesha silt loam 



Wabash clay 



Cassloam 



Buckner fino sandy loam 



Bucknerloam 



Bremer silty clay loam. . 



Bremer silt loam 



Grundy silty clay loam . . 

 Cass sandy loam 



Soil. 



Buckner fine sand 



Cass silty clay loam 



Riverwash 



Cass sand 



Buckner sand 



Calhoim silt loam 



Buckner silt loam 



Colldvial phase 



Bremer clay 



Muck 



Knox fine sand 



Putnam silt loam 



Muscatine silty claj- loam 



Total 



Acre-s. 



3,130 



2,944 



2,496 



1,984 



1,408 



1,344 



128 



1,152 



1,216 



1,216 



640 



384 



256 



2.53, 440 



Per 

 cent. 



1.2 

 1.2 

 1.0 

 O.S 

 0.5 

 0.5 

 0.5 



0.5 

 0.5 

 0.3 

 0.2 

 0.1 



GRUNDY SILT LOAM. 



The surface soil of the Grundy silt loajn is a dark-brown to black, 

 friable silt loam, extending to a depth of about 12 inches. The sub- 

 soil is a dark-brown to black, heavy silt loam to silty clay loam, pass- 

 ing at 18 to 20 inches into a dark-brown silty clay loam slightly mottled 

 with yellowish brown. At about 24 inches this in turn passes into a 

 heavy silty clay loam to silty clay which is strongly mottled dark 

 brown, bluish gray, arid yellowish brown. The dark brown soon dis- 

 appears and the material becomes heavier and more compact with 



