The average volume of rock fragments in the particle-size control section is more than 35 percent. In unlimed soils reaction ranges from extremely acid to slightly acid throughout. The dominant clay minerals are illite, vermiculite and interstratified vermiculite chlorite. Small amounts of kaolinite are present. The Ap or A horizons have hue of 10YR, value of 3 to 5, and chroma of 2 to 4.
Texture is loam or silt loam in the fine earth fraction.
The B horizon has hue of 5YR to 2.5Y, value of 4 to 6, and chroma of 3 to 8. Hue of 5YR is restricted to the lower part of the soil. Texture is loam, silt loam or silty clay loam in the fine earth fraction. It contains 5 to 32 percent clay and 40 to 60 percent silt. Structure is weak or moderate, fine or medium subangular blocky structure in the Bw horizon and is usually obscured by the rock fragments in the CB horizon.