LOCATION BABOON UTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Typic Argixerolls
TYPICAL PEDON: Baboon very cobbly loam, rangeland. (Colors are for air dry soil unless otherwise noted.)
The soil surface is covered with 2 percent stones, 20 percent cobbles and 30 percent gravel.
A1--0 to 2 inches; brown (10YR 5/3) very cobbly loam, very dark grayish brown (10YR 3/2) moist; weak fine and very fine granular structure; soft, friable, nonsticky and slightly plastic; few medium, many fine and very fine roots; many very fine interstitial pores; 1 percent stones, 20 percent cobbles, and 5 percent gravel; mildly alkaline (pH 7.8); clear wavy boundary. (1 to 4 inches thick)
A2--2 to 6 inches; brown (10YR 5/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak fine and very fine granular structure; soft, friable, nonsticky and nonplastic; few coarse, medium, many fine and very fine roots; many very fine interstitial pores; 5 percent cobbles and 15 percent gravel; mildly alkaline (pH 7.8); clear wavy boundary. (4 to 6 inches thick)
Bt1--6 to 11 inches; brown (10YR 5/3) very gravelly clay loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure parting to moderate fine subangular blocky; slightly hard, firm, slightly sticky and slightly plastic; many fine and very fine roots; many medium, fine and very fine random tubular pores; common faint clay films on faces of peds and lining pores; 35 percent gravel; mildly alkaline (pH 7.8); clear smooth boundary. (5 to 11 inches thick)
Bt2--11 to 21 inches; pale brown (10YR 6/3) very cobbly clay loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure parting to moderate fine subangular blocky; hard, firm, sticky and plastic; many fine and very fine roots; many medium, fine and very fine random tubular pores; common distinct clay films on faces of peds and lining pores; 20 percent cobbles and 20 percent gravel; mildly alkaline (pH 7.6); clear wavy boundary. (8 to 11 inches thick)
Bt3--21 to 30 inches; pale brown (10YR 6/3) very gravelly clay loam, brown (10YR 4/3) moist; moderate medium subangular blocky parting to moderate fine subangular blocky; hard, firm, sticky and plastic; few medium, fine and very fine random tubular pores; common faint clay films on faces of peds; 5 percent cobbles and 35 percent gravel; mildly alkaline (pH 7.6); abrupt wavy boundary. (3 to 12 inches thick)
C--30 to 34 inches; pale brown (10YR 6/3) very cobbly clay loam, brown (10YR 4/3) moist; massive; hard, firm, sticky and plastic; many very fine interstitial pores; 30 percent cobbles and 10 percent gravel; mildly alkaline (pH 7.6); clear wavy boundary. (0 to 6 inches thick)
R--34 inches; fractured intermediate igneous bedrock.
TYPE LOCATION: Iron County, Utah., about 0.8 miles west-southwest of Dry Willow Peak, about 2,300 feet south and 1,700 feet east of the northwest corner of sec. 17, T. 31 S., R. 10 W; Baboon Peak Quadrangle; lat. 38 degrees 6 minutes 35 seconds N. and long. 113 degrees 0 minutes 22 seconds W.
RANGE IN CHARACTERISTICS:
Soil moisture - The soil moisture regime is xeric bordering on aridic. The soil moisture control section, in 6 or more out of 10 years, is dry in all parts for 60 or more consecutive days in the 4 months following the summer solstice, and moist in all parts for 45 or more consecutive days in the 4 months following the winter solstice. Also, in 6 or more out of 10 years, the moisture control section is moist in some part for more than half the cumulative days per year when the soil temperature at a depth of 20 inches from the soil surface is higher than 41 degrees F., and for 90 or more consecutive days when the soil temperature at a depth of 20 inches is higher than 46 degrees F.
Mean annual soil temperature - 47 to 52 degrees F.
Particle size control section clay content - 27 to 35 percent
Particle size control section rock fragment content - 35 to 60 percent igneous gravel and cobbles
Depth to bedrock - 20 to 40 inches
Thickness of mollic epipedon - 7 to 15 inches
The A horizon has a hue of 7.5YR or 10YR, value is 4 or 5 dry and 2 or 3 moist, and chroma is 1 to 3. Texture is loam or clay loam with 0 to 5 percent stones, 5 to 35 percent cobbles and 5 to 45 percent gravel. Reaction is neutral or mildly alkaline.
In some pedons a BA horizon is present. hue of 7.5YR or 10YR, value is 4 or 5 dry and chroma is 2 or 3. Texture is gravelly clay loam or cobbly clay loam. This horizon has 0 to 30 percent cobbles and 10 to 35 percent gravel. Reaction is neutral or mildly alkaline.
The Bt horizon has a hue of 7.5YR or 10YR, value is 4 to 6 dry and 3 or 4 moist, and chroma is 2 to 4. Texture is very gravelly clay loam or vey cobbly clay loam. Clay content is 27 to 35 percent. The horizon contains 0 to 30 percent cobbles and 10 to 50 percent gravel. Reaction is mildly or moderately alkaline.
The C horizon has a hue of 7.5YR or 10YR, value is 5 or 6 dry, 4 or 5 moist, and chroma is 3 or 4. Texture is very gravelly clay loam or very cobbly clay loam. Clay content is 27 to 35 percent. The horizon contains 0 to 40 percent cobbles and 5 to 60 percent gravel. Reaction is mildly or moderately alkaline. It may be slightly or strongly effervescent in some pedons, and the carbonates are disseminated. In some pedons this horizon may be absent.
COMPETING SERIES:
Badge (WA) soils are very deep.
Collard (UT) soils are very deep.
Dixiejett (T OR) soils are 40 to 60 inches to bedrock.
Goodnoe (T WA) soils have 18 to 27 percent clay in the particle size control section.
Hooverton (ID) soils have more than 60 percent rock fragments in the particle size control section.
Kusshi (T WA) soils are very deep.
Phys (OR) soils are very deep.
Ridd (UT) soils have less than 18 percent clay in the particle size cotrol section.
Whitinger (T CA) soils have argillic horizons that are dominanted by stones and cobbles.
GEOGRAPHIC SETTING: Baboon soils are on mountainsides. These soils formed in colluvium and residuum derived dominantly from basic and intermediate igneous rocks. Elevations are 5,200 to 7,600 feet. Slopes are 15 to 50 percent. The mean annual precipitation is 12 to 14 inches; mean annual air temperature is 45 to 50 degrees F.; and the freeze free period is 90 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Pioche and Checkett soils. Both of these soils are shallow to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; medium to high runoff; moderately slow permeability.
USE AND VEGETATION: Rangeland. The present vegetation is Utah juniper, big sagebrush, antelope bitterbrush, bluebunch wheatgrass, and muttongrass.
DISTRIBUTION AND EXTENT: Central and Southern Utah; MLRA D28A; This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Iron County, Iron-Washington Area Soil Survey, Utah, 1997. This soil is named after Baboon Peak.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to 11 inches (A1, A2, and Bt1 horizons).
Argillic horizon - the zone of clay accumulation from 6 to 30 inches (Bt1, Bt2, and Bt3 horizons).
Particle size control section - the zone from 6 to 26 inches.
The classification is based on the "Keys to Soil Taxonomy, Eighth Edition, 1998". The cation exchange activity class is an estimate based on NASIS data.