Goldyke soils have 15 to 35 percent rock fragments in the particle-size control section and also have hard bedrock within 40 inches. Perlor soils have mean annual soil temperature of 47 to 52 degrees F. and are not intermittently moist for 10 to 20 days cumulative during summer months. Slatery soils have 15 to 20 percent pararock fragments in the particle-size control section and have B horizons with identifiable secondary carbonates. Birdsley and Persayo soils have 18 to 35 percent clay in the particle-size control section. Oceanet soils have mean annual soil temperature of 47 to 52 degrees F. and have more than 35 percent fine sand or coarser.
Roic soils are on pediments and hills.
They formed in residuum and colluvium derived from tuffaceous sedimentary rocks of lacustrine origin. Slopes are 2 to 50 percent. Elevations range from 4,500 to 6,000 feet. The climate is arid with cool, moist winters and hot, dry summers. The mean annual precipitation is 4 to 6 inches, the mean annual temperature is 50 to 54 degrees F., and the frost-free period is 120 to 150 days.