Clay loam or clay. Moderately alkaline to strongly alkaline. Moderately alkaline to strongly alkaline. Lower part consist of weakly to strongly cemented layers alternating with strata of extremely gravelly loamy coarse sand. Risue soils have mean annual soil temperatures of 50 to 54 degrees F., and are dry during the summer.
Fuegosta soils are on erosional fan remnants of fan piedmonts.
These soils formed in alluvium from mixed rock sources, mainly volcanic tuffs with minor amounts of quartzite and limestone. Slopes are 2 to 8 percent. Elevations are 4,600 to 6,200 feet. The climate is semiarid with cool moist winters. Summers are hot and dry with occasional convection storms.