Orthic Sombric Brunisol (O.SB)

Common horizon sequence: LFH, Ah, Bm, C

These soils have the general properties specified for the Brunisolic order and the Sombric Brunisol great group. Usually they have an organic layer at the surface, a dark grayish brown to black Ah horizon, a brown acid B horizon, and an acid C horizon.

Orthic Sombric Brunisols are identified by the following properties

1. They have an Ah horizon at least 10 cm thick or an Ap horizon at least 10 cm thick with a moist color value less than 4.
2. They have a pH (0.01 M CaCl₂) of less than 5.5 as specified for the great group.
3. They have a Bm horizon at least 5 cm thick.
4. They lack an eluvial horizon, Ae or Aej, at least 2 cm thick.
5. They lack mottles that indicate gleying as specified for Gleyed Sombric Brunisols.
6. They lack a duric horizon.

Note: Diagnostic horizons are underlined.

List all known examples