LOCATION SANCRANE IDEstablished Series
TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, superactive, calcareous Typic Cryaquepts
TYPICAL PEDON: Sancrane silt loam--on a 2 percent slightly concave, northeast-facing slope at 6,290 feet elevation in improved pastureland. (Colors are for dry soil unless otherwise noted. When described on June 20, 1985 the soil was dry to 8 inches and moist below this depth with ground water at 24 inches).
Akg--0 to 2 inches; light brownish gray (2.5Y 6/2) silt loam, grayish brown (2.5Y 5/2) moist; moderate thin platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; common very fine and fine tubular and interstitial pores; common lime filaments in soil matrix; violently effervescent (35 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear smooth boundary. (1 to 6 inches thick)
Bkg1--2 to 8 inches; light gray (2.5Y 7/2) silt loam, grayish brown (2.5Y 5/2) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; many very fine and fine tubular and interstitial pores; common lime filaments in soil matrix; violently effervescent (30 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear wavy boundary. (4 to 8 inches thick)
Bkg2--8 to 15 inches; light gray (2.5Y 7/2) silt loam, grayish brown (2.5Y 5/2) moist; weak medium subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; common fine and medium roots; common fine and medium tubular and interstitial pores; strongly effervescent (25 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear wavy boundary. (5 to 10 inches thick)
Bkg3--15 to 24 inches; light brownish gray (2.5Y 6/2) silt loam, olive gray (5Y 4/2) moist; common fine and medium distinct gray (N5/) depletions; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine and fine tubular and interstitial pores; strongly effervescent (25 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear smooth boundary. (5 to 12 inches thick)
2Cg1--24 to 31 inches; light brownish gray (2.5Y 6/2) very gravelly loamy sand, olive (5Y 4/3) moist; single grain; loose; few fine roots; many medium and coarse interstitial pores; 45 percent pebbles; slightly effervescent (10 percent calcium carbonate equivalent); slightly alkaline (pH 7.8); clear smooth boundary. (5 to 20 inches thick)
2Cg2--31 to 60 inches; light brownish gray (2.5Y 6/2) extremely gravelly loamy coarse sand, olive gray (5Y 4/2) moist; single grain; loose; many medium and coarse interstitial pores; 65 percent pebbles; slightly effervescent (10 percent calcium carbonate equivalent); slightly alkaline (pH 7.8).
TYPE LOCATION: Custer County, Idaho; approximately 1 mile northeast of Chilly Buttes, about 600 feet north and 800 feet east of the southwest corner of section 20, T.9N., R.22E. Latitude - 44 degrees, 05 minutes, 23 seconds North; Logitude - 113 degrees, 52 minutes, 45 seconds West.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 37 to 42 degrees F
Average summer soil temperature - 40 to 43 degrees F
Organic horizon thickness - 0 to 3 inches
Depth to high water table - 12 inches above the surface to 18 inches below the soil surface
Depth to sand and gravel - 20 to 35 inches
Akg horizon
Hue - 2.5Y or 10YR
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 or 3 moist
Calcium carbonate equivalent - 25 to 35 percent
Bkg horizon
Hue - 2.5Y or 5Y
Value - 6 to 8 dry, 4 through 6 moist
Chroma - 2 or 3 dry or moist
Texture - SIL, VFSL
Percent clay - 18 to 27
Coarse fragments - 0 to 10 percent
Calcium carbonate equivalent - 15 to 30 percent
Reaction - slightly or moderately alkaline
2Cg horizon
Hue - 2.5Y or 5Y
Chroma - 2 or 3 dry, or moist
Texture - GRX-LS, GRV-LS, GRX-LCOS
Percent clay - 0 to 5
Rock fragments - 45 to 75 percent
Calcium carbonate equivalent - 2 to 10 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Sancrane soils are on stream terraces and flood plains. These soils formed in medium textured alluvium over flood deposited gravel. Slopes are 0 to 2 percent. Elevations are 4,800 to 6,400 feet. The climate is cold and moist in winter and spring and cool in summer. The average annual precipitation is 8 to 14 inches. Average annual temperature is 35 to 42 degrees F. Frost-free period is 20 to 55 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dickeypeak and Thosand (T) soils. Dickeypeak soils are on fan terraces and stream terraces and have average summer soil temperatures greater than 43 degrees F. and fine-loamy particle-size control sections. Thosand soils are on stream terraces and have a fine-loamy, particle-size control section and are 40 to 60 inches to strongly contrasting textures.
DRAINAGE AND PERMEABILITY: Poorly drained. Slow runoff; moderate permeability through the solum and very rapid in the substratum.
USE AND VEGETATION: Pastureland. The vegetation is grasses and sedges.
DISTRIBUTION AND EXTENT: East-central Idaho. These soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Custer County, Idaho, 1999.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon
Calcic horizon - The zone from 0 to 24 inches (the Akg, Bkg1, Bkg2, and Bkg3 horizons).
Particle-size control section - The zone from 10 to 40 inches (part of the Bkg2, the Bkg3, the 2C1, and part of the 2C2 horizons).