The Bt1 or BA horizon has hue of 7.5YR or 10YR, value of 4 and chroma of 2 to 6. It is very gravelly silt loam or very cobbly silt loam. Reaction is medium acid to very strongly acid. The Bt2 horizon has hue of 10YR or 7.5YR, value of 4 or 5 and chroma of 4 to 6. It is very cobbly or very gravelly analogues of silt loam or silty clay loam.
Reaction is strongly acid to extremely acid.
There are no other series in the family. Taumsauk soils are on convex side slopes of mountain ridges. The position is commonly on back slopes or shoulder slopes, but may be on undulating summits. Slopes range from 8 to 35 percent. These soils formed in colluvium or residuum weathered from rhyolite or felsite.