
A petrocalcic horizon is a diagnostic horizon in USDA soil taxonomy. They are formed when secondary Calcium Carbonate or other carbonates accumulate in the subsoil to the extent that the soil becomes cemented into a hardpan. Petrocalcic horizons are similar to a duripan and a petrogypsic horizon in how they affect land-use limitations. They can oc...
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http://en.wikipedia.org/wiki/Petrocalcic_Horizon
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