The Izar series consists of shallow and very shallow, well drained soils that formed in residuum and colluvium from dolomite, tuff, conglomerate and sandstone.
Izar soils are on hills and fan piedmont remnants with a rock core and rock pediment remnants.
Slopes are 0 to 75 percent. Izar very gravelly loam, rangeland. The surface is partially covered by approximately 60 percent pebbles. Calcium carbonate equivalent - 5 to 35 percent. Commonly has silica and lime pan fragments covering up to 75 percent of the surface area.