LOCATION PEDLEFORD IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Calcic Haploxerolls
TYPICAL PEDON: Pedleford very stony loam - on a 4 percent slope at an elevation of 5,160 feet in rangeland. When described July 22, 1980, the soil was dry throughout. (Colors are for dry soil unless otherwise noted.)
A--0 to 5 inches; dark brown (10YR 4/3) very stony loam, dark brown (10YR 3/3) moist; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine, few medium and coarse roots; many very fine and fine irregular pores; about 30 percent stones, 10 percent cobbles, and 5 percent pebbles; neutral (pH 7.0); clear wavy boundary. (3 to 6 inches thick)
Bw--5 to 13 inches; brown (10YR 5/3) very stony loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; many very fine and fine, and few medium and coarse roots; common very fine and fine tubular pores; about 30 percent stones, 10 percent cobbles, and 5 percent pebbles; slightly alkaline (pH 7.4); abrupt wavy boundary. (6 to 9 inches thick)
Bk1--13 to 29 inches; very pale brown (10YR 7/3) very stony silt loam, yellowish brown (10YR 5/4) moist; massive; very hard, firm, slightly sticky, slightly plastic; few very fine and fine roots; few very fine and fine tubular pores; about 30 percent stones, 20 percent cobbles, and 5 percent pebbles; moderately alkaline (pH 8.2); violent effervescence (about 20 percent calcium carbonate); gradual wavy boundary. (5 to 18 inches thick)
Bk2--29 to 33 inches; very pale brown (10YR 7/3) very cobbly loam, yellowish brown (10YR 5/4) moist; massive; hard, firm, slightly sticky, slightly plastic; few very fine and fine tubular pores; about 35 percent cobbles, 15 percent stones, and 5 percent pebbles; slightly alkaline (pH 7.8); violent effervescence (about 20 percent calcium carbonate); abrupt irregular boundary. (3 to 8 inches thick)
2R--33 inches; hard lime-coated basalt.
TYPE LOCATION: Blaine County, Idaho about 13 miles east of Carey; 300 feet east and 50 feet north of the southwest corner, sec. 26, T. 1 S., R. 23 E.
RANGE IN CHARACTERISTICS:
Depth to bedrock - 20 to 40 inches
Annual soil temperature - 42 to 47 degrees F.
Thickness of mollic epipedon - 10 to 14 inches
Thickness of solum - 10 to 22 inches
Depth to calcic horizon - 13 to 20 inches
A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Bw horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture - STV-SL, STV-L, CBV-L
Clay content - 13 to 19 percent
Rock fragments - 35 to 60 percent
Reaction - neutral to slightly alkaline
Bk horizons
Value - 6 to 8 dry, 5 to 8 moist
Chroma - 2 to 4 dry or moist
Texture - STV-SIL, STV-L, CBV-L
Clay content - 10 to 16 percent
Rock fragments - 35 to 60 percent
Reaction - slightly alkaline to strongly alkaline
COMPETING SERIES: These are the Buist, Conneridge, Dagan, Hondoho, Ireland, Jebo, Niarada and Tuckerdowns series. Buist, Dagan, Hondoho, Niarada and Tuckerdowns soils are deeper than 40 inches to bedrock. Conneridge soils have more than 60 percent rock fragments in the lower part of the particle-size control section. Jebo soils have 7.5YR and 5YR colors in the B horizon. Ireland soils have more than 60 percent rock fragments in the lower part of the profile.
GEOGRAPHIC SETTING: Pedleford soils are on basalt plains and buttes. Slopes range from 2 to 30 percent. Elevation ranges from 4,700 to 6,000 feet. The soil formed in loess and eolian material reworked by water over basalt. The average annual precipitation is 12 to 16 inches, most of which falls as winter snow and early spring rain. The average annual air temperature is about 41 to 45 degrees F. The frost-free season is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: The Cox, Deerhorn, McCarey, Molyneux, Rehfield, and Wildors soils. Cox soils are less than 20 inches deep. Deerhorn and Wildors soils have average annual soil temperatures warmer than 47 degrees F. McCarey soils have an argillic horizon and has less than 35 percent rock fragments in the control section. Molyneux soils have argillic horizons and are very deep. Rehfield soils are deep and very deep and have average annual soil temperatures warmer than 47 degrees F. Cox, Deerhorn, McCarey, and Wildors soils occur on convex positions on basalt plains and sides of buttes. Molyneaux and Rehfield soils occur in drainageways and depressions on basalt plains.
DRAINAGE AND PERMEABILITY: Well-drained. Runoff is slow to rapid. Permeability is moderate.
USE AND VEGETATION: Mainly used for rangeland. Vegetation is basin big sagebrush and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: South-central Idaho. The series is of limited extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Blaine County, Idaho, 1985.
REMARKS: Diagnostic horizons and features recognized in this series are:
Mollic epipedon - the zone from the surface of the soil to approximately 13 inches (A and Bw horizons)
Calcic horizon - the zone from approximately 13 to 33 inches (Bk1 and Bk2 horizons)
Lithic contact - About 33 inches