The Wellrock series consist of deep, well drained soils that formed in loess and the underlying residuum from siltstone on hills.
Permeability is moderately slow.
Slopes range from 6 to 18 percent. Wellrock silt loam on a convex 12 percent slope in a forest. The depth to the base of the argillic horizon is 38 to 58 inches. Depth to a paralithic contact is 40 to 60 inches. The particle-size control section averages 24 to 32 percent clay, and 1 to 5 percent sand.