Some pedons have iron masses in this horizon. These are the Marksbutte , Novina , Ovina , Sunset , and Wann soils in the same family and the Cass , Darr , Lex , and Ord soils. Marksbutte soils may be saturated for less than 90 days during the growing season and salinity is more than 4 mmhos throughout. The Novina, Ovina, Sunset, Wann, and Cass soils lack coarse sand or gravelly sand above a depth of 40 inches. In addition, Cass soils are better drained.
Darr soils are similar in depth to coarse sand or gravelly sand but are better drained.
Alda soils are nearly level and on flood plains. They formed in 20 to 40 inches of stratified loamy alluvium over coarse sand or gravelly sand. The slope gradient ranges from 0 to 3 percent, and some areas are channeled. The range of mean annual temperature is from 48 to 55 degrees F, and the range of mean annual precipitation is from 18 to 30 inches. These include the Cass , Darr , Lex , Gibbon , Inavale , Leshara , Ovina , Platte and Wann soils.