For use in all LRRs, except for N, Q, R, S, V, W, X, and Y, those using A7 (LRRs P, T, U, and Z), and MLRA 1 of LRR A.
A layer of mucky modified loamy or clayey soil material 10 cm (4 inches) or more thick starting at a depth of 15 cm (6 inches) or less from the soil surface.
User Notes: “Mucky” is a USDA texture modifier for mineral soils. The content of organic carbon ranges from 5 to 12 percent.