Annaw soils are on alluvial fans, fan piedmonts and fan skirts.
Slopes are 2 to 15 percent. Annaw very gravelly loamy sand, rangeland. The soil surface is covered with approximately 40 percent surface pebbles and 1 to 2 percent cobbles. Effervescence - Calcareous in all parts, ranges from slightly effervescent to violently effervescent. Other features - Buried B horizon below 40 inches is absent in most pedons.