Gypsisol

Gypsisols in the World Reference Base for Soil Resources (WRB) are soils with substantial secondary accumulation of gypsum (CaSO4.2H2O). They are found in the driest parts of the arid climate zone. In the USDA soil taxonomy they are classified as Gypsids (USDA Soil Taxonomy), in the Russian soil classification they are called Desert soils (USSR). thumb|left|250px|Distribution of Gypsisols right|thumb|Calcic Gypsisol found in the US

Gypsisols are developed in mostly unconsolidated alluvial, colluvial and aeolian deposits of base-rich weathering material. They are found on level to hilly land in arid regions. The natural vegetation is sparse and dominated by xerophytic shrubs and trees and/or ephemeral grasses