Smectic - Biasiallitic soil material in which smectite is the dominant mineral in the clay fraction. Typically smectite content is more than 50 percent of the clay fraction.

Organic Soil Material

Organic- Soil material that meets the definition of histic material and occurs in soils that are classified as Histosols. (Soil Survey Staff, 1997. Keys To, Soil Taxonomy. USDA-Soil Conservation Service, SMSS Technical Monograph no.19.)