Concept Clarification
Fragment of a discussion from Course talk:APBI200/Archive/2017-18WT2
One way to think about eluviation is "washing out" and illuviation as "washing in". Thus Ae is an eluviated A horizon - where organic matter, clay or Al/Fe oxides may be eluviated (or washed out) of the A horizon. Illuvial horizons include Bt, Bf, Bh where clay, Fe/Al oxides or organic colloids are "washed in" or accumulate.
SandraBrown (talk)