The Rockbridge series consist of very deep, well drained, soils formed in loess and in underlying clayey pedisediment and residiuum from glauconitic sandstone on erosion remnants of highly dissected stream terraces of glacial or preglacial age.
Permeability is moderate in the loess and moderately slow in clayey pedisediment.
Slopes range from 6 to 20 percent. Mean annual precipitation about 30 inches. Rockbridge silt loam - cultivated. The solum ranges from 24 to 40 inches. The upper part of the solum, exclusive of limited surface horizons, is slightly to strongly acid.