Some pedons have a BA horizon with the same range of colors and reaction as the Bt horizon. The BA horizon is silt loam. It is clay loam, loam, silty clay loam, or silt loam. Average clay content ranges from 20 to 35 percent, and average sand content ranges from 15 to 40 percent. Gravel content is less than 10 percent.
Reaction is slightly acid to moderately alkaline.
Assumption and Harrison soils do not have carbonates within a depth of 60 inches. Aviston soils have less than 15 percent sand in the lower part of the series control section. Barrington, Blackberry, and Clare soils have horizons in the middle or lower part of the series control section with sand content greater than 40 percent. Buckhart soils have less than 7 percent sand throughout the series control section. Dana, Danabrook, Geryune, Graymont and Saybrook soils have horizons with more than 15 percent sand within a depth of 40 inches.