Covington and Kingsbury soils are developed in lacustrine or marine clays. Runoff is low to medium. Permeability is moderately rapid throughout the profile. Most areas have been cleared of stones and are used for silage corn, hay, and pasture. Steep areas are mainly forested or idle.
Some areas are in residential or commercial use.
The Champlain Valley in Franklin County, Vermont and, possible, New York. The series of small extent. The St. Albans series was formerly classified as Entic Haplorthods.