"Loss of suction forces in silty materials, leading to generally shallow failures ( this may be an important mechanism in residual soils in tropical areas following deforestation );
12.
Laterite is a red residual soil in tropical and subtropical regions that is leached of soluble minerals, aluminum hydroxides and silica, but still contains concentrations of iron oxides and iron hydroxides.
13.
The soils of the Missouri River Valley and surrounding areas are mainly rocky residual soils, which are excellent for viticulture ( growing of grapes / vineyards ) though poor for most agricultural purposes.
14.
In the past it was widely grown as lowland crop on residual soil water after the harvest of long-season rice, but it has been displaced to a great extent where shorter duration rice varieties are grown.
15.
In addition, there are twenty-three fields of alluvial placer gold in the region ( nineteen of which were being developed and prospected in 2006 ) and seven residual soil gold fields suitable for open-cut mining in the southeast.
16.
Residual soils are very deep, highly permeable, and subject to drought, with intermittent, low to medium gradient streams and spring-fed Deschutes and Fremont-Winema National Forests ( including the Gearhart Mountain Wilderness ) and the lower elevations of the Newberry National Volcanic Monument.
17.
Saprolites form in the lower zones of soil horizons In lateritic regoliths & ndash; regoliths are the loose layer of rocks that rest on the bedrock & ndash; saprolite may be overlain by upper horizons of residual laterite; most of the original profile is preserved by residual soils or transported overburden.
