The Omulga series consists of very deep, moderately well drained soils formed in loess, colluvium, or old alluvium, and in most areas by underlying lacustrine sediments. These soils are on valley fills in abandoned preglacial drainage systems in the Allegheny Plateau which lack glacial influence.
Permeability is moderate above the fragipan and slow in the fragipan.
Slopes range from 0 to 15 percent. Omulga silt loam - on a 2 percent convex slope in a cultivated field. Thickness of the solum ranges from 40 to 100 inches. Depth to the fragipan ranges from 18 to 36 inches. Volume of rock fragments, generally water-worn gravel, ranges up to 5 percent above the fragipan, up to 10 percent in the Btx, B't or BC horizons, and up to 15 percent in the 2B't, 2BC, and 2C horizons.