LOCATION BOONEVILLE ID+COEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Booneville loam -- on a north-facing concave slope of 25 percent under mixed subalpine fir and Douglas-fir woodland, at 6,790 feet elevation. (Colors are for air dry soil unless otherwise stated. When described on September 19, l978, the soil was moist throughout under 2 inches of snow.)
Oe--0 to 2 inches; partly decomposed needles and twigs. (1/2 to 2 inches thick)
A1--2 to 7 inches; dark brown (10YR 3/3) loam, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable; few fine and common medium roots; few fine and very fine vesicular and interstitial pores; 10 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (3 to 5 inches thick)
A2--7 to 16 inches; brown (10YR 4/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak medium and coarse subangular blocky structure parting to weak fine and medium granular; soft, very friable; common fine, medium, and coarse roots; few fine and very fine vesicular pores; 15 percent gravel, 10 percent cobbles, 3 percent stones; slightly acid (pH 6.1); clear wavy boundary. (6 to 15 inches thick)
Bt1--16 to 32 inches; yellowish brown (10YR 5/4) very cobbly loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; few medium and common coarse roots; few very fine, fine and medium tubular pores; common faint clay films on faces of peds and rock fragments; 15 percent gravel, 25 percent cobbles, 15 percent stones; slightly acid (pH 6.3); gradual wavy boundary. (16 to 30 inches thick)
Bt2--32 to 60 inches; brown (7.5YR 5/4) extremely cobbly clay loam, dark brown (7.5YR 3/4) moist; moderate medium angular blocky structure; hard, very friable, moderately sticky and moderately plastic; few medium roots; few fine and medium tubular pores; common faint clay films on faces of peds and rock fragments; 20 percent gravel, 35 percent cobbles, 20 percent stones; slightly acid (pH 6.3).
TYPE LOCATION: Owyhee County, Idaho; about 1 mile south and 2 1/2 miles west of Silver City; 2,300 feet north and 800 feet east of the southwest corner of section 11, T.5S, R.4W.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 20 to 44 inches
Average annual soil temperature - 36 to 40 degrees F.
Average summer soil temperature - 50 to 55 degrees F. (Thin O horizon not used in determining soil temperature regime.)
Particle-size control section - 35 to 60 percent rock fragments, 22 to 33 percent clay
Moisture control section - dry for 20 to 35 days after the summer solstice
A horizon
Value -3 through 5 dry, 1 through 3 moist
Chroma - 1 through 3 dry or moist
Rock fragments - 5 to 45 percent
Reaction (pH) - slightly acid or neutral
Bt1 horizon
Hue - 7.5YR or 10YR
Value - 4 or 5 dry, 2 through 4 moist
Chroma - 2 through 4 dry or moist
Texture - CBV-L, GRV-L, GRV-SCL, CBV-CL, or STV-CL
Rock fragments - 35 to 60 percent
Reaction (pH) - moderately acid through neutral
Bt2 horizon
Hue - 7.5YR or 10YR
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 2 through 4 dry or moist
Texture - CBX-CL, CBV-CL, GRX-SCL, CBV-L, STV-CL
Rock fragments - 35 to 80 percent
Reaction (pH) - moderately acid through neutral
COMPETING SERIES: These are the Badwater, Bickmore, Bluebell, Buena Vista, Dab, Delhew, Geemore, Keman, Littlemud, Panin, Parkalley (T), Parkay, Redbird, Rutherford, Woodcock and Woodhurst series. Badwater soils are 20 to 40 inches deep to the base of the argillic and are bouldery in the argillic. Bickmore, Bluebell, Buena Vista, Littlemud, Panin, Rutherford and Woodhurst soils are 20 to 40 inches to bedrock. Dab soils are xeric. Geemore soils have secondary lime and a discontinuous cemented layer above 40 inches. Keman soils do not have O horizons and have average summer soil temperature of 55 to 58 degrees F. Parkalley soils have an average summer soil temperature greater than 55 degrees F. and the depth to the base of the argillic is less than 40 inches. Parkay soils have a solum less than 45 inches thick and do not have an O horizon. Redbird soils have carbonates at a depth of 14 to 26 inches and a Bt that is 10 to 16 inches thick. Delhew soils have an average annual soil temperature of more than 40 degrees F. Woodcock soils have a Bt horizon in which much of the clay is in nondispersible sand-sized aggregates and have an average annual soil temperature of more than 40 degrees F.
GEOGRAPHIC SETTING: Booneville soils are on moderately steep to steep concave back slopes and foot slopes of mountains and foothills. Elevations range from 5,200 to 8,800 feet in Idaho and up to 10,800 feet in Colorado. Slopes range from 5 to 65 percent. These soils formed in slope alluvium and colluvium from basalt and welded tuff. The climate is cold and moist in winter and warm and dry in summer. The average annual precipitation is 22 to 32 inches most of which is snow. In Colorado the precipitation ranges to 45 inches. The average annual temperature is 33 to 39 degrees F. The frost-free period is 30 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dehana (T), Southmount (T), and the competing Parkay series. Dehana and Southmount soils have less than 35 percent coarse fragments in the control section. These are on similar landscape positions.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderately slow permeability.
USE AND VEGETATION: Booneville soils are used mainly for woodland and wildlife habitat. The dominant natural vegetation is Douglas fir, subalpine fir, mountain snowberry, Oregon grape, and elk sedge. Quaking aspen is a common seral species.
DISTRIBUTION AND EXTENT: Booneville soils are of small extent in southwestern and eastern Idaho and west central Colorado.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Fremont County, Idaho, l989.
REMARKS: Diagnostic horizons and other features recognized in this pedon:
Mollic epipedon - zone 2 to 32 inches (A1, A2, and Bt1 horizons)
Argillic horizon - zone 16 to 60 inches (Bt1 and Bt2 horizons)
Particle-size control section - zone 16 to 36 inches (Bt1 and part of Bt2 horizons)