b horizon

noun Geology.

1. the subsoil in a soil profile.

noun

1. the layer of a soil profile immediately below the A horizon, containing deposits of leached material

1. In ABC soil, the second and middle zone, characterized by an accumulation of soluble or suspended organic material, clay, iron, or aluminum. These materials originate in the A horizon and are transported to the B horizon through the process of eluviation. B horizons often have a blocky structure and are reddish in color due to the presence of oxidized metals. Also called zone of accumulation zone of illuviation