 Two fairly distinct types may be recognized; the modified loess-Kansan of the upland and the alluvial of the bottom and "second bottom" lands. The first covers much the greater area, while the latter is the more tractable and may be the more productive....  Annual Report for ... with Accompanying Papers - Seite 394von Iowa Geological Survey - 1903Vollansicht - Über dieses Buch
 | 1903 - 502 Seiten
...under the head of the clay industry. Soils. As in all of the other counties of the state the eoils are after all the most important asset of the county....from the gravels and sands at the base of the drift, the sub-loessial sands or from the alluvial sands and gravels. During wet seasons all of these furnish... | |
 | Iowa Geological Survey - 1903 - 526 Seiten
...discussed sufficiently under the head of the clay industry. Soils. types may be recognized; the modified 1 loess-Kansan of the upland and the alluvial of the...from the gravels and sands at the base of the drift, £Ee sub-loessial sands or from the alluvial sands and gravels. During wet seasons all of these furnish... | |
 | Paul Skeels Pierce - 1917 - 100 Seiten
...processes of agriculture, but affords excellent pasturage. The bottom land soils are more porous and usually highly productive when not too sandy. In especially...seasons they are sometimes subject to inundation." The stratified shale clays of the coal measures underlie the district. Shale outcrops are common along... | |
 | Sudhindra Bose - 1918 - 636 Seiten
...processes of agriculture, but affords excellent pasturage. The bottom land soils are more porous and usually highly productive when not too sandy. In especially...seasons they are sometimes subject to inundation." The stratified shale clays of the coal measures underlie the district. Shale outcrops are common along... | |
| |
