Dubach, Holston, Noboco, and Warnock soils have hue of 7.5YR or yellower throughout. Ironcity, Leesburg, Minvale, Nella, and Octavia soils have sandstone or chert gravels in the Bt horizon. Lytle soils formed from loess-mantled coastal plain sediments. Ruston soils are bisequal, with a glossic horizon in the lower part. Sailes soils formed in Tertiary-aged formations containing glauconitic parent materials.
Silsbee soils are on plane to slightly convex, gently sloping to strongly sloping uplands.
Slopes are 1 to 12 percent. These soils are on the flatwoods east of the Trinity River. The soils formed in loamy sediments of the Lissie Formation of early to mid Pleistocene age. Mean annual precipitation ranges from 48 to 56 inches. Mean annual temperature ranges 67 to 69 degrees F. Frost free days range from 240 to 270.