Redoximorphic features

Redoximorphic features (RMFs) consist of color patterns in a soil that are caused by loss (depletion) or gain (concentration) of pigment compared to the matrix color, formed by oxidation/reduction of iron and/or manganese coupled with their removal, translocation, or accrual; or a soil matrix color controlled by the presence of iron (2+)[1] The composition and responsible formation processes for a soil color or color pattern must be known or inferred before it can be described as an RMF.[2]

References

Schoeneberger, P.J.; Wysocki, D.A.; Benham, E.C.; Soil Survey Staff (2012). "Field book for describing and sampling soils, Version 3.0". Natural Resources Conservation Service, National Soil Survey Center.
H.V. Cabadas-Báez, S. Sedov, S. Jiménez-Álvarez, D. Leonard, B. Lailson-Tinoco, R. García-Moll, I. Ancona-Aragón, L. Hernández. (2018). "Soils as a Source of Raw Materials for Ancient Ceramic production in the Maya region of Mexico: Micromorphological insight". Boletín de la Sociedad Geológica Mexicana. 70: 21–48. doi:10.18268/BSGM2018v70n1a2.CS1 maint: multiple names: authors list (link)

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[1] Schoeneberger, P.J.; Wysocki, D.A.; Benham, E.C.; Soil Survey Staff (2012). "Field book for describing and sampling soils, Version 3.0". Natural Resources Conservation Service, National Soil Survey Center.

[2] H.V. Cabadas-Báez, S. Sedov, S. Jiménez-Álvarez, D. Leonard, B. Lailson-Tinoco, R. García-Moll, I. Ancona-Aragón, L. Hernández. (2018). "Soils as a Source of Raw Materials for Ancient Ceramic production in the Maya region of Mexico: Micromorphological insight". Boletín de la Sociedad Geológica Mexicana. 70: 21–48. doi:10.18268/BSGM2018v70n1a2.CS1 maint: multiple names: authors list (link)