LOCATION COLLARBUTTON AZEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, thermic Aridic Lithic Argiustolls
TYPICAL PEDON: Collarbutton gravelly sandy clay loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 1 inch (0 to 3 cm); brown (7.5YR 4/3) gravelly sandy clay loam, very dark brown (7.5YR 2.5/2), moist; weak very fine and fine subangular blocky structure; soft, very friable, moderately sticky, moderately plastic; many very fine roots; few fine irregular pores; 25 percent gravel; noneffervescent; neutral, pH 7.2; abrupt smooth boundary. (1 to 3 inches thick)
Bt--1 to 12 inches (3 to 30 cm); brown (7.5YR 4/3) sandy clay loam, dark brown (7.5YR 3/3), moist; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; many very fine roots; common fine tubular pores; common continuous distinct clay films on faces of peds and rock fragments; 5 percent gravel; noneffervescent; slightly alkaline, pH 7.6; abrupt wavy boundary. (8 to 15 inches thick)
R--12 to 60 inches (30 to 152 cm); unweathered andesite.
TYPE LOCATION: Pinal County, Arizona; located at a latitude 32 degrees, 48 minutes, 16 seconds North and longitude 110 degrees, 28 minutes, 3 seconds West NAD83; about 450 feet west and 700 feet north of the southeast corner of Section 23, T. 7 S, R. 18 E; USGS Quadrangle - Oak Grove Canyon.
RANGE IN CHARACTERISTICS:
Soil moisture - Intermittently moist in some part of the soil moisture control section during July - September and December - February. Driest during May and June. Aridic ustic soil moisture regime.
Soil temperature: 59 to 64 degrees F.
Rock fragments: 0 to 25 percent
Clay content: 20 to 35 percent
Organic Matter: 1 to 3 percent
Reaction: 6.6 to 7.8 (neutral to slightly alkaline)
Depth to lithic contact: 7 to 20 inches
A horizon
Hue: 7.5YR to 2.5YR
Value: 4 dry, 2.5 or 3 moist
Chroma: 2 or 3, dry or moist
Texture: clay loam, sandy clay loam
Bt horizon
Hue: 7.5YR to 2.5YR
Value: 4 dry, 2.5 or 3 moist
Chroma: 2 or 3, dry or moist
Texture: sandy clay loam, clay loam, clay
R horizon
Strongly cemented to indurated andesite and other related volcanic bedrock
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Collarbutton soils are on hills and mountains at elevations of 4,400 to 6,300 feet. They formed in slope alluvium and residuum derived from andesite and other related volcanic rocks. Slopes range from 10 to 60 percent. The mean annual precipitation is 16 to 20 inches. The mean annual air temperature is 57 to 62 degrees F. The frost-free period is 160 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cherrycow and Stanford soils. Cherrycow soils are moderately deep and the particle-size control section is fine. Stanford soils are very deep.
DRAINAGE AND PERMEABILITY: Well drained; high to very high runoff; moderately slow permeability.
USE AND VEGETATION: Used for livestock grazing, wildlife habitat and recreation. Vegetation is Emory oak, cane beardgrass, desert trumpet buckwheat, juniper, mesquite, plains lovegrass, red brome, sacahuista, sideoats grama, yerba de pasmo.
DISTRIBUTION AND EXTENT: Central Arizona. Collarbutton soils are somewhat extensive. MLRA is 41 and 38.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Pinal, County, Arizona. Soil Survey of Eastern Pinal and Southern Gila Counties, Arizona (AZ661); 2009. Collarbutton is the local name for Holy Joe Peak in the Galiuro Mountains.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from 0 to 12 inches (A and Bt horizons)
Argillic horizon - The zone from 1 to 12 inches (Bt horizon)
Lithic contact - The boundary at 12 inches (R horizon)