Fine-silty, Carbonatic, Mesic Histic Humaquepts. Soil profile of Martisco muck, sandy substratum, 0 to 1 percent slopes, drained showing a thin layer of Muck over Marl. A substratum of sand is below 40 inches. (not shown). This soil has "textbook" marl in the upper 4 inches, and "brown" marl in the remainder of the solum (does not meet the color definition of marl). Elkhart Co., IN