Soils Suborders

a horizon horizon that forms at or near the surface

formed during long-continued use of the soil by humans

organic epipedons that occur primarily in cool hmid regions of the world; saturated with water for less than 30 days a year

high content of organic matter as in Folistic, but normally saturated with water for more than 30 days a year

dark colored surface organic horizon associated with grasslands

thick, dark colored, humus-rich suface horizon with a base saturation of 50% or more. Bivalent cations (Ca++, Mg++) are dominant on the exchange complex. Formed by underground decomposition of organic residues such as roots of grasses

thin, light-colored organic horizon

human-made surface layer produced by long-continued manuraing

mineral soil material that is thick, dark colored, humus-rich, with less base sturation than Mollic epipedon