The Tunkhannock series consists of very deep, well to somewhat excessively drained soils formed in water-sorted glacial material derived from reddish sandstone, siltstone, and shale. Slopes range from 0 to 60 percent.
Permeability is moderately rapid in the solum and rapid in the substratum.
Mean annual precipitation is 40 inches. Tunkhannock gravelly loam - cultivated. Solum thickness ranges from 20 to 40 inches. Rock fragments, dominantly water rounded sandstone or siltstone range from 15 to 60 percent, by volume, in individual horizons of the B horizon and from 40 to 80 percent in the C horizon. Rock fragments average more than 35 percent in the 10 to 40 inch particle size control section.