Ferris and Heiden soils have chroma of 2 or more in the upper 12 inches. Houston Black soils have greater amplitude of waviness and are on uplands in a higher position. Moderately well drained. Permeability is very slow. Runoff is low.
Flooding is common except where the soil is protected.
Duration of flooding is very brief or brief. Most areas are in pasture or cultivated to crops such as cotton, corn, sorghums, or small grains. Native vegetation is elm, hackberry, oak, and ash, with an understory of grasses such as species of paspalums and panicums. The series is extensive. This change was based on several years study and analysis of the soils mapped in the Tinn series.