The Marseilles series consists well drained and moderately well drained soils formed in a thin layer of loess and the underlying residuum weathered from shale. These soils are moderately deep to noncalcareous shale. Some pedons formed entirely in residuum.
Permeability is moderate in the loess and slow in the residuum.
Slope ranges from 0 to 60 percent. Mean annual temperature is about 51 degrees F, and mean annual precipitation is about 33 inches. 41 degrees 17 minutes 20 seconds N., and long. The depth to the base of the argillic horizon ranges from 20 to 40 inches and commonly is the same as the depth to the paralithic contact. The depth to the residuum ranges from 0 to 30 inches.