Unadilla and Allard soils are on associated silt-mantle outwash terraces. Moderately well drained and well drained. The potential for surface runoff is medium to high. Permeability is moderate in the surface layer and upper part of the subsoil and slow or very slow in the fragipan and substratum. Most acreage of this soil has been cleared and is used for growing hay, oats, corn, or pasture.
Some areas are idle and some are in urban uses.
Woodlots contain sugar maple, American beech, red oak, and associated northern hardwoods. Glaciated Appalachian Plateau of New York and northwestern Pennsylvania. MLRA 139 and 140. The series is of moderate extent. Allegheny County, New York, 1946.