Duric Sombric Brunisol (DU.SB)
Common horizon sequence: LFH, Ah, Bm or Bfj, Bc or BCc, C
These soils have the general properties specified for the Brunisolic order and the Sombric Brunisol great group. They differ from Orthic Sombric Brunisols by having a duric horizon within the control section. They may also have Ae and Btj or Bfj horizons and mottles that indicate gleying. A duric horizon is a strongly cemented acidic horizon that does not meet the requirements of a podzolic B and usually has a color similar to that of the parent material. This horizon has either an abrupt or a clear upper boundary and a diffuse lower boundary usually at least 50 cm below. Air-dry clods do not slake when immersed in water.
Note: Diagnostic horizons are underlined.