For use in all LRRs except T, U, W, X, Y, and Z and all but MLRA 136 of P
A layer of mucky modified sandy soil material 5 cm (2 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 is at least 5 percent and ranges to as high as 12 percent.