The mean annual precipitation is 6 to 10 inches, much of it as snow. The frost-free season is 115 to 150 days. These soils lack argillic horizons. Rovana soils have sandy control sections and are on alluvial fans and fan terraces. Ulymeyer soils have sandy-skeletal control sections and are on alluvial fans and fan terraces.
Vegetation is mainly big sagebrush, desert bitterbrush, Nevada ephedra and desert needlegrass.
Alluvial fans in east-central California. The soils are of small extent in MLRA - 26 and 29. 1.1 Organic carbon values of 0.4 to 0.6 percent were determined in laboratory using the wet combustion method. This places the soil in Xerollic subgroup. MAP is 8 to 10 inches - determined by extrapolating between weather stations, considering topographic influences, and using vegetation as indicators.