When found at shallow depths, they present formidable constraints for agricultural development. These soils are best suited for use as rangelands. Natrargids are Argids with natric horizons. Normally the upper boundary of the natric horizon lies within a few centimeters of the surface. The agricultural use of Natrargids is limited chiefly by the low permeability of the natric horizon.
Some soils have both a duripan and a natric horizon.
These soils were classified as Nadurargids, but are now classified in the new Suborder Durids. The combination of the duripan's density and the natric horizon's low permeability makes these soils especially difficult to manage for crop production. Paleargids are old Argids. Paleargids have argillic horizons that are thick and red or have an abrupt upper boundary. Under the 1975 edition of Soil Taxonomy, Paleargids were soils with more than 35 per cent clay in some part of the argillic horizon and also with an abrupt textural change in the upper part of the profile.