| | 
| 
g Fine | Coarse | Medium | Fine i, | Silt Clay 
eer | Gravel. | Sand. | Sand. Sand. cia ras eo 
| Sand. | 
tee | | 
Marshall Silt Loam....... 0.2 1a ihe} 3.9 5.7 67.2 20.0 
Miami Silt Loam......... 0.4 1.8 1.0 Daoud ||. Tiss | 68.4 18.9 
| | 
On the “second bottoms” the soils contain a much greater percentage 
of sand and are correspondingly poor in silt and clay. The quantity of 
organic matter is variable depending upon location and drainage condi- 
tions. Typical examples of “second bottom” soils are the Sioux sandy 
loam and Miami sand the composition of which, as given by the Bureau 
of Soils, is shown in the following table: 
| 1 
6 | : ; | Very | 
Som. ne ae | Hn =e Fine Silt. Clay. 
Gravel. Sand. Sand. Sand. z 
| Sand 
ms eae hs ee | 
Sioux Sandy Loam.... 2.2 9.8 10.2 28.5 LOESE | 27a. 11.2 
Miami Fine Sand......... 0 3.0 13.3 52.0 | 11.5 13.8n 6.4 
| | 
The characteristic soil of the river bottoms is the Wabash silt loam. 
This is the material deposited during periods of high water. It resembles 
the upland soils in its high silt-clay content, but differs in haying a con- 
siderable percentage of sand. The mechanical composition of this soil as 
given by the Bureau of Soils is as follows: 
; 4 z Very 
Fine Coarse | Medium Fine 5 a 
ae | Gravel. Sand. Sand. Sand fae eat. Oley. 
Sand 
Wabash Silt Loam....... 0.0 Trace. 0.3 27.0 Py iN 66.1 28.4 
These, as well as the other soils of the region not herein specifically 
mentioned, are all characterized by their prevailing fine texture, a rule 
that holds even in the case of the sandy soils in which the major con- 
stituent is the fine sand, so that, in spite of the rapid drainage afforded 
