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Subsurface Horizons

Soils

TermDefinition
Albic Horizon E horizon light colored
Argillic Horizon Bt at least 7.5 or 15 cm thick clay films greater amount of clay than above or PM PM < 15% clay -- 3% increase PM 15 - 40% clay -- 1.2 ratio of argillic horizon to above or PM PM > 40% clay -- 8% increase
Natric Horizon Btn prismatic, columnar in structure > 15% exchangeable sodium
Spodic Horizon Bh, Bs, Bhs buildup of Fe, Al, OM; cracked coatings on grains where all the sesquioxides have been moved down into; leached out from E horizon usually beneath an albic or Ej horizon
Cambic Horizon Bw redder than the underlying horizon soil has no geologic structure
Oxic Horizon Bo lateritic soil, found in tropical areas > 30 cm thick > 15% clay < 16meq/100g of CEC
Calcic Horizon Bk > 15 cm > 15% CaCO3 compared to PM
Gypsic Horizon By > 15 cm > 5% increase in gypsum from PM
Salic Horizon Bz > 15 cm thick > 2 % of salts more soluble than gypsum
Duripan Bqm silica cemented horizon
Fragipan Bx high BD loamy material, slakes in water, usually motled
Created by: rockpockets
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