Decreases irregularly with depth. Imperial soils contain gypsum, and have very hard or extremely hard consistence when dry and very firm or extremely firm consistence when moist. Gadsden soils are on flood plains at elevations of 75 to 2100 feet. Slopes are less than 3 percent. These soils formed in stratified stream alluvium from quartzite, schist, and granite-gneiss.
Gadsden soils are in a hot arid continental climate.
The mean annual precipitation ranges from 2 to 10 inches occurring as summer thunderstorms and gentle winter rains. The frost-free period is about 240 to 325 days. These are the Antho , Avondale , Cashion , Gilman , Glenbar , and Vint soils. Antho and Gilman soils are coarse-loamy. Avondale soils are fine-loamy.