SOIL SURVEY OF WRIGHT COUNTY, IOWA. 23 



8 to 18 inches. This is underlain by a horizon of dark brown, usually 

 very thin or only a few indies in thickness. The lower subsoil is 

 brown or yellowish brown, heavier in texture than the upper horizon, 

 and usually friable and coarsely g^-anular. The carbonates have, as 

 a rule, been removed to a depth of more than 3 feet below the surface. 



To this group of soils belongs the Waukesha loam of the terraces. 

 It has a profile similar to the Carrington in general appearance and 

 differs from that series only in topographic position and origin. Al- 

 though it is composed of material^^ of alluvial deposition, its compo- 

 sition is probably not greatly different from that of the Carrington 

 soils. 



The Buckner series, which also belongs to this group of soils, has 

 dark-brown soils underlain by brown subsoils of a similar texture to 

 a depth of more than 3 feet. The friable uniform subsoils distinguish 

 these soils from the Waukesha series, which have heavier subsoils. 



The soils of the Clarion series belongs to a stage of development 

 intermediate between the Webster and the Carrington groups. The 

 topography ranges from undulating to gently rolling. The series 

 occupies the more gentle slopes near the small streams and poorly 

 drained areas within areas of the Carrington soils. The better 

 drainage as compared with the Webster soils has resulted in more 

 or less leaching to a depth of 3 or 4 feet. The surface soils are dark 

 brown to black. The upper subsoil grades downward from a dark 

 brown into a brown, and the texture is heavier than that of the 

 surface soil, being a silty clay loam. The unweathered lower sub- 

 soil is grayish brown to gray, approaching the color of the glacial 

 drift from which it is derived. It has sufficient carbonates to 

 effervesce with acid, and streaks of lime and lime concretions are 

 common. 



The terrace soils of the Bremer series have also been developed 

 under conditions of poor drainage. The surface soils are almost 

 black and usually have a fine granular structure. They are under- 

 lain by a mottled gray, yellow, and brown subsoil somewhat heavier 

 as a rule than the surface soil. The carbonates have been largely 

 removed to a depth of more than 3 feet, and in this respect they 

 differ from the Fargo soils, which have a higher percentage of lime 

 in the subsoil. 



The soils of the O'Neill series are dark brown to black. The sub- 

 soils are light textured . and give excessive drainage to the soil. 

 These soils are leached of their lime to a depth of several feet. 



The soils of the Wabash series were for the most part originally 

 forested, but owe their dark color to Ix-ing made up of recent alluvial 

 deposition of material from other dark-colored soils. These soils 



