Trevlac soils formed in residuum weathered from interbedded siltstone, shale, and sandstone bedrock. The Berks soils do not have an argillic horizon and are on similar landscape position. Tilsit soils have a fragipan and are on less sloping broader ridgetops. The Wellston soils contain less coarse fragments in the solum, are more than 40 inches to bedrock and are on ridgetops and less sloping side slopes. Runoff is rapid or very rapid.
Permeability is moderate.
Dominant use is woodland. Some areas are used for hayland and pasture. Native vegetation consisted of mixed hardwoods with oaks, hickory, beech, maple, and tulip poplar the major species. Series is of moderate extent. Brown County, Indiana, l985.