Somepedogenic horizons are indicated as follows: organogenic – O or Ao; humus-accumulative – A or A1; eluvial – E or A2; illuvial – B (Bt, Bi or B1, B2, B3 etc.); metamorphic – B; gleyed – G; hydromorphic (hydro-accumulative) - ВCa, Вsol, S.
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