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illuviation
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soil
leaching
eluviation
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illuviation

geology
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History

illuviation, 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 article was most recently revised and updated by William L. Hosch.