Accumulation of dissolved or suspended soil materials in one area or layer as a result of leaching (percolation) from another. Usually clay, iron, or humus wash out and form a line with a different consistency and color. These lines are important for studying the composition and ages of rock strata.
This entry comes from Encyclopædia Britannica Concise.
For the full entry on illuviation, visit Britannica.com.
Seen & Heard
What made you look up illuviation? Please tell us what you were reading, watching or discussing that led you here.