Cambic Horizon __top__ -

An is a subsurface diagnostic soil horizon characterized by the accumulation of silicate clays. It is a key concept in soil classification systems like USDA Soil Taxonomy and the WRB (World Reference Base for Soil Resources).

To be classified as an argillic horizon, specific criteria usually must be met: cambic horizon

To be classified as a cambic horizon under major systems like the USDA Soil Taxonomy and the World Reference Base for Soil Resources (WRB) , the layer must satisfy precise morphological and chemical parameters: An is a subsurface diagnostic soil horizon characterized