Gravelly loamy sand or gravelly sand. In some pedons a discontinuous laminar cap is present. There are no competing series. The Palos Verdes series are similar. Palos Verde soils are shallow over a duripan.
Migern soils are on convex fan piedmont remnants.
These soils formed in mixed alluvium from mostly volcanic rocks. Slopes are 2 to 8 percent. Elevations are 2,300 to 4,500 feet. The climate is hot, arid with dry summers and winters. These are the Canutio , Seaman , and Peloncillo series.