The Bigetty and Irran soils occur in arid to semiarid moisture regimes. The Port soils have hues of 7.5YR or redder throughout. The Asa, Spur and Velow soils have mollic epipedons less than 20 inches thick. The Bosque, Gageby, Gowen and Whitesboro soils have fine-loamy control sections. The Frio soils have more than 35 percent clay in the control section.
Elandco soils are on flood plains.
Slopes are plane to slightly convex and gradients are mostly 0 to 1 percent. The soils formed in alluvium of medium and moderately fine particle size. Unless protected, flooding occurs at intervals ranging from one to two times each year to once in 4 to 10 years. Mean annual temperature ranges from 57 to 70 degrees F. Average annual precipitation ranges from 23 to 40 inches, and the Thornthwaite P-E indices from 36 to 64. These are the Bunyan and Deleon series.