Calcium carbonate equivalent ranges from 5 to 25 percent, but averages 15 percent or less in more than half of all pedons. If Bss horizon is at 12 inches or less, the chroma is less than 3. The BCk horizon has hue of 5YR or 7.5YR, value of 5 to 7, and chroma of 2 to 4. Texture is clay, silty clay or clay loam. Clay content ranges from 35 to 60 percent clay.
Coarse fragments range from none to few fine pebbles.
Visible calcium carbonate in the form of films, threads and masses ranges from common to many. Calcium carbonate equivalent ranges from 5 to 35 percent. Similar soils are the Dalby , Montoya , Stamford , and Tobosa series. Bonita soils have a buried paleosol at 25 to 40 inches, and receive winter precipitation. Millox soils have hue of 2.5Y and yellower, SAR of 10 to 60 and receive dominantly winter precipitation.