These are the Kirbyville and Otanya soils. Kirbyville soils are moderately well drained and are on lower landscape positions. Otanya soils have a subsoil yellower than 5YR and are on similar to lower landscape positions. Silsbee soils are well drained. Runoff is low on 3 to 5 percent, and medium on 5 to 12 percent slopes.
Permeability is moderate.
Some areas are used for pastureland. Pastures are bahiagrass and improved bermudagrass. Native vegetation is longleaf pine, yaupon, bluestems, panicums and paspalums. The series is of moderate extent. The Silsbee soils were formerly inluded with the Otanya and Attoyac series.