The strict eluvial horizon ( E horizon ) is typically light gray, clay-depleted, contains little organic matter and has a high concentration of silt and sand particles composed of quartz and other resistant minerals.
2.
Gray Brown Luvisols have a dark Ah horizon in which organic matter has been mixed with the mineral material ( commonly by earthworm activity ), a brown, often platy eluvial horizon ( Ae ) and an illuvial horizon ( Bt ) in which blocky structure is common.
3.
In a typical soil profile, the eluvial horizon refers to a light-colored zone located ( depending on context and literature ) either at the lower part of the A horizon ( symbol : Ae ) or within a distinct horizon ( E horizon ) below the A, where the process is most intense and rapid.
4.
Gray Luvisols have eluvial and illuvial horizons and may have an Ah horizon if the mean annual soil temperature is below 8 �C . Vast areas of Gray Luvisols in the Boreal Forest Zone of the Interior Plains have thick, light grey eluvial horizons underlying the forest litter and thick Bt horizons with clay coating the surface of aggregates.
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