Clay films: Translocated or illuvial clay along soil ped face (Georgeville soil series Bt horizon)
Figure 3-20. Shiny clay films coat the surface of this ped. (Soil Survey Manual, USDA Handbook No. 18; issued March 2017).
Translocated clay along ped faces is called clay films or argillans. They appear as a waxy coating. If stained with iron, they are identified as ferriargillians. Soil horizons with sufficient clay illuviation are argillic horizons.
For more information about describing and sampling soils, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/field...
or Chapter 3 of the Soil Survey manual:
www.nrcs.usda.gov/sites/default/files/2022-09/The-Soil-Su...
For additional information on "How to Use the Field Book for Describing and Sampling Soils" (video reference), visit:
www.youtube.com/watch?v=e_hQaXV7MpM
For additional information about soil classification using USDA-NRCS Soil Taxonomy, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/keys-...
or;
www.nrcs.usda.gov/resources/guides-and-instructions/soil-...
For more information about Soil Taxonomy, visit;
Clay films: Translocated or illuvial clay along soil ped face (Georgeville soil series Bt horizon)
Figure 3-20. Shiny clay films coat the surface of this ped. (Soil Survey Manual, USDA Handbook No. 18; issued March 2017).
Translocated clay along ped faces is called clay films or argillans. They appear as a waxy coating. If stained with iron, they are identified as ferriargillians. Soil horizons with sufficient clay illuviation are argillic horizons.
For more information about describing and sampling soils, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/field...
or Chapter 3 of the Soil Survey manual:
www.nrcs.usda.gov/sites/default/files/2022-09/The-Soil-Su...
For additional information on "How to Use the Field Book for Describing and Sampling Soils" (video reference), visit:
www.youtube.com/watch?v=e_hQaXV7MpM
For additional information about soil classification using USDA-NRCS Soil Taxonomy, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/keys-...
or;
www.nrcs.usda.gov/resources/guides-and-instructions/soil-...
For more information about Soil Taxonomy, visit;