Some pedons have a BC horizon with colors and textures similar to the Bt horizon. The C or Cg horizon has hue of 10YR or 7.5YR, value of 4 to 7, and chroma of 1 to 8. It is sandy loam or loamy sand or their gravelly or very gravelly analogues. Strata of sand, sandy clay loam, loam, and fine gravel are in some pedons. Rock fragment content ranges from 10 to 40 percent and averages more than 15 percent.
Reaction is slightly alkaline or moderately alkaline.
The Ashtabula, Centerburg, Cygnet, Houcktown, Jenera, Nicely, Tuscola, Vanlue, and Williamstown soils average less than 15 percent rock fragments in the lower part of the series control section. Bogart, Mount Lucas, Scattersville, and Swampoodle soils are more acid than slightly alkaline in the lower part of the series control section. Conowingo soils have predominantly serpentine rock fragments in the lower part of the series control section. Lehigh and Reaville soils have a lithic contact within the series control section. Thackery soils have less than 2 percent rock fragments in the upper part of the series control section and averages less than 5 percent clay in the lower part.