Humic Regosol (HR)

These Regosolic soils have an Ah or dark colored Ap horizon at least 10 cm thick at the mineral surface. They may have organic surface horizons and buried mineral-organic horizons. They do not have a B horizon at least 5 cm thick.

Orthic Humic Regosol (O.HR)

Common horizon sequence: Ah, C

These soils have the properties specified for the Regosolic order and the Humic Regosol great group. They are identified by the following properties:

  1. They have an Ah or dark-colored Ap horizon at least 10 cm thick.
  2. They have no B horizon or the B horizon is less than 5 cm thick.
  3. They have a low content of organic matter throughout the control section below the A horizon; this is reflected in a uniform color with differences of Munsell color value of less than one unit between layers.
  4. They lack faint to distinct mottling that indicates gleying within the upper 50 cm.

List all known examples

Cumulic Humic Regosol (CU.HR)

Common horizon sequence: Ah, C, Ahb, C

These soils have the properties specified for the Regosolic order and the Humic Regosol great group. They differ from Orthic Humic Regosols by having layers below the Ah or Ap horizon that vary in color value by one or more units, or organic matter contents that vary irregularly with depth. They do not have faint to distinct mottles that indicate gleying within 50 cm of the mineral surface. Commonly these soils result from either mass wasting of soil downslope or intermittent flooding and deposition of material.

List all known examples

Gleyed Humic Regosol (GL.HR)

Common horizon sequence: Ah, Cgj

These soils have the properties specified for the Regosolic order and the Humic Regosol great group. They differ from Orthic Humic Regosols by having faint to distinct mottles that indicate gleying within 50 cm of the mineral surface.

List all known examples

Gleyed Cumulic Humic Regosol (GLCU.HR)

Common horizon sequence: Ah, Cgj, Ahb, Cgj

These soils have the properties specified for the Regosolic order and the Humic Regosol great group. They differ from Cumulic Humic Regosols by having faint to distinct mottles that indicate gleying within 50 cm of the mineral surface.

List all known examples

Note: Diagnostic horizons are underlined.