This area of the map contains a mixture of Springerville soils, Stony rough land, and Stony steep land. Springerville soils are generally limited to elevations of 3,500 ft. ( 1,067m ) to 6,500 ft. ( 1,982m), while Stony rough and Stony steep lands occur at elevations of about 3,200 ft. (976m).
Springerville: Springerville soils generally consist of moderately deep and deep, well-drained soils. They formed in material weathered from basalt and cinders. These typically have a dark grayish-brown to reddish-brown surface layer that is slightly hard when dry and has platy or granular structure. The underlying layers are brown or reddish brown, are extremely hard when dry, and break into large, blocky aggregates. Springerville soils are generally calcareous at depth and in some places to the surface. They are found at elevations where annual precipitation ranges from 11 to 18 inches and they are dissected by deep canyons in many places. The plant cover consists mainly of pinyon pine and juniper, with sparse Gambel oak and ponderosa pine. It includes blue and black grama, as well as some sideoats grama, squirreltail, turbinella oak, mountain-mahogany, snakeweed, and filaree. At the lowest elevations (3,500-4,000 ft.), mesquite, canotia, pricklypear, filaree, and tobosa are found.
Stony rough land, sandstone: This subunit consists of steep and very steep hillsides and canyon walls on which there are shallow, cobbly and stony soils and outcrops of sandstone and basalt. It occurs in areas where the average annual precipitation is 18-20 inches. In most places, the soil material is less than 8 inches deep and the slope ranges from 20 to 60 percent. These areas are highly erodible, with protective plant cover consisting of oak brush, some juniper, and moderate stands of blue grama.
Stony steep land, basalt: This subunit consists of basalt outcrops, small broken basalt escarpments, and pockets of very shallow and shallow, brown, clayey soils that have stones, cobblestones, and gravel on the surface. It occurs in areas with moderate to steep side slopes and on the walls of canyons in the central and western parts of the watershed, where the average annual precipitation is 13-16 inches. Plant cover consists of turbinella oak, juniper, loco, pricklypear, and sideoats grama. The surface is covered in basalt talus, stones, and cobblestones in areas where it is devoid of vegetation.
Williams, J.A.; Anderson, T.C., Jr. 1967. Soil Survey of Beaver Creek Area, Arizona. USDA Forest Service, Soil Conservation Service and Arizona Agriculture Experiment Station.