Willamar soils have thinner sola and thinner epipedons. Francitas, Livia, and Matagorda soils, as well as Lindsey soils, have more than 35 percent clay in the Bt horizon. Dietrich soils are on low coastal terraces and plains that are 1 to 10 feet above sea level along the Coastal Bend area of southern Texas. Slopes range from 0 to 2 percent. These soils are saturated with water from a few days to several week during the spring or fall seasons of the year.
Surfaces are plane to slightly convex and nearly level to gently undulating.
The soils formed in loamy saline marine sediments assumed to be of the Pliestocene age. The climate is sub-humid with a mean annual precipitation of 28 to 38 inches. The Thornthwaite P-E index ranges from 34 to 44. These are Galveston , Mustang , Narta , Orelia , Papalote , and Victoria series. All of these soils except Galveston and Mustang soils occur at higher elevations.