Content of clay typically is 38 to 46 percent, but ranges to 60 percent. A stone line is at the top of this horizon or at the base of the A or BA horizon, and some stones and pebbles are in the 2Bt horizon. The lower part of the 2Bt horizon and the 2BC horizon have mottles ranging in hue from 5YR to 5Y. Grayish mottles are dominant in the lower part. These horizons are clay loam and content of clay ranges from 30 to 38 percent. The 2C horizon has hue of 10YR, value of 4 or 5, and chroma of 2 through 6.
Mottles are dominantly of low chroma and are common or many.
This horizon is clay loam and content of clay ranges from 30 to 38 percent. This horizon contains pebbles and stones. These are the Arispe , Chase , Flanagan , Greenton , Grundy , Herrick , Ipava , Lagonda , Lamoni , Macksburg , Mahaska , Malvern , Martin , Mayberry , Pawnee , Rutland , Seymour , Shorewood , and Wymore soils in the same family and the Armstrong , Lineville , Mystic , and Shelby series. Arispe, Flanagan, Greenton, Grundy, Herrick, Ipava, Macksburg, Mahaska, Martin, Rutland, Seymour, Shorewood, and Wymore soils have less sand and pebbles in the solum and lack 7.5YR or redder hue in the upper part of the B horizon. Chase and Martin soils have mollic epipedons greater than 24 inches thick.