There are no competing series. Similar series include the Bolar , Castroville , Engle , Hidalgo , Raymondville , and Venus series. Bolar and Venus soils have mean annual soil temperatures of less than 72 degrees F., and in addition, Bolar soils contain more than 40 percent calcium carbonate in the control section. Castroville soils have fine-silty control sections. Engle soils have sola less than 40 inches thick and mean annual soil temperatures of less than 72 degrees F. Hidalgo soils have more than 18 percent silicate clay in the control section.
Sarnosa soils occupy nearly level to moderately sloping uplands.
Slopes range from 0 to 8 percent, but are dominantly less than 5 percent. The regolith is calcareous loamy earth with thin strata of weakly cemented calcareous sandstone mainly of the Oakville sandstone and sandstone member of the Goliad formations. Mean annual precipitation ranges from 26 to 36 inches. Mean annual temperature ranges from 70 to 74 degrees F. Frost free days range from 275 to 290, and elevation ranges from 200 to 400 feet. Thornthwaite P-E indices range from 36 to 48.