GENERAL DESCRIPTION OF THE AREA. 
15 
eluded in the Boone series. Where these slope soils are distinctly 
dark in color, they are included in the Bates series. The Boone 
series includes a fine sandy loam and a fine sand. The Bates 
series, of which the area is small, includes a silt loam and a fine 
sandy loam. 
Distinct terraces are developed in the Mississippi Valley and 
also in the larger tributary valleys. The terraces in tributary 
valleys are occupied largely by soils which are predominantly 
silty, with comparatively little sand, while in the Mississippi Val¬ 
ley and Chippewa Valley the greater part of the material out¬ 
side of the present flood plain is of a sandy nature. This tei- 
race material is classed with three series—the Waukesha, which 
is black or dark brown; the Lintonia, which is light colored and 
not underlain by gravel or other coarse material; and the Plain- 
field, which is light colored and rests upon a substratum of sand 
and gravel. In the Waukesha series there are two types, the 
gravelly sandy loam and silt loam. In the Lintonia series three 
types are recognized—the Lintonia silt loam, fine sandy loam, 
and fine sand; and in the Plainfield series three types—sand, 
fine sand, and fine sandy loam. 
In many of the smaller valleys tributary to the Mississippi and 
Chippewa Valleys the present flood plain consists of a dark-col¬ 
ored material, variable in texture and color, and poorly drained. 
This material has been carried down from the unglaciated higher 
lands, transported by streams and redeposited. Such material 
is classed with the Wabash series, and in the present survey one 
type—the Wabash loam—is recognized and mapped. The soil 
of the present flood planes of the Chippewa and Mississippi Riv¬ 
ers which, in addition to being poorly drained, is subject to over¬ 
flow by these streams at intervals, has been classed with the Gen¬ 
esee series. This series includes a fine sandy loam, silt loam, and 
silty clay loam. 
On the steep slopes throughout the upland part of the county 
there are extensive tracts where the outcrops of rock are so 
numerous or the surface so steep and broken that the land is of 
no agricutural value except for the little pasturage it affords. 
Such land has been classed as Rough Stony Land and may be 
considered as non-agricultural. 
A few low-lying acres occur in which the material consists of 
vegetable matter in various stages of decomposition. Such tracts 
are mapped as Peat. 
