Sasco silt loam - rangeland. Driest during May and June. Typic aridic soil moisture regime. The buried soil, when present, is at depths of 40 to 60 inches or more. There are no competing series.
Sasco soils are on stream terraces.
Slopes are 0 to 1 percent. The soils formed in silty textured alluvium of Holocene Age. The alluvium is derived from acid and basic igneous rocks which are mainly granite, schist, rhyolite, andesite, and quartzite. Elevations are 1100 to 2000 feet. The mean annual precipitation is 4 to 10 inches.