ABSTRACT
B horizon — (soils) The horizon immediately beneath the A horizon characterized by a higher colloid clay or humus content or by a darker or brighter color than the soil immediately above or below, the color usually being associated with the colloidal materials. The colloids may be of alluvial origin as clay or humus; they may have been formed in place, such as clays including sesquioxide; or they may have been derived from a texturally layered parent material.
