Soils in related families are the Ashgrove , Atlas , Bluford , Calwoods , Creal , Givin , Hurst , Kernan , Rathbun , Sabina and Weller series. Ashgrove and Atlas soils have a higher sand content in much of the lower part of the solum formed in partially exhumed paleosols are in the vertic subgroup. In addition, Ashgrove soils have more clay in the Bt horizon. Bluford soils have brittle Bx horizons in the lower part of the solum. Calwoods soils have higher clay content in the upper 20 inches of the argillic horizon and have colors of somewhat lower chroma in the B horizon.
Creal soils are fine-silty.
Givin soils have Ap horizons with value of 3 or less. Hurst and Kernan soils have less contrast in clay content between the B and the C horizons. Also, the Hurst soils formed partly in fine textured lacustrine sediments, and the Kernan soils have a higher proportion of illite in the lower part of the sola, having formed in loess and till or lakebed sediments. Rathbun and Weller soils have a higher maximum clay content in the argillic horizons. Sabina soils contain more sand and gravel in the lower part of the solum.