LOCATION LONGS IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Haploxerolls
TYPICAL PEDON: Longs ashy loam, forested -- on a west-facing slope of 40 percent at 5,760 feet elevation. When described on October 11, 1994, the soil was dry throughout. (Colors are for air-dry soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed forest litter.
A--1 to 9 inches; brown (10YR 4/3) ashy loam, dark brown (7.5YR 3/2) moist; moderate fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, medium and coarse roots; many very fine, fine and medium irregular pores; 10 percent gravel; slightly acid (pH 6.2); gradual wavy boundary. (6 to 12 inches thick)
AB--9 to 29 inches; yellowish brown (10YR 5/4) gravelly ashy loam, dark brown (7.5YR 3/3) moist; weak medium and coarse subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine, fine, medium and coarse roots; many very fine, fine and medium irregular pores; 25 percent gravel, 5 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (13 to 25 inches thick)
2Bt1--29 to 44 inches; brown (10YR 4/3) extremely gravelly loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; soft, very friable, slightly sticky and moderately plastic; many very fine, fine and medium, few coarse roots; many very fine, fine and medium irregular and tubular pores; few faint clay films on faces of peds; 50 percent gravel, 20 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (10 to 20 inches thick)
2Bt2--44 to 49 inches; dark yellowish brown (10YR 4/4) extremely gravelly loam, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and moderately plastic; many very fine, fine and medium, few coarse roots; many very fine, fine and medium irregular and tubular pores; few faint clay films on faces of peds; 50 percent gravel, 20 percent cobbles; moderately acid (pH 6.0); gradual wavy boundary. (0 to 10 inches thick)
2R--49 inches; fractured basalt.
TYPE LOCATION: Boise County, Idaho; about 4 miles north and 4 miles west of Banks; 1,900 feet south and 400 feet east of the northwest corner of section 11, T.9 N., R.2 E.; USGS High Valley Quadrangle; Latitude - 44 degrees, 07 minutes, 58 seconds N. and Longitude - 116 degrees, 11 minutes, 41 seconds W.; NAD 83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 20 to 45 inches
Depth to bedrock - 40 to 60 inches
Particle-size control section - 18 to 27 percent clay; 35 to 75 percent rock fragments
Reaction - moderately acid or slightly acid
Base saturation - 50 to 75 percent in the zone from 10 to 30 inches
Moisture control section - dry 45 to 75 consecutive days following the summer solstice
Average annual soil temperature - 42 to 47 degrees F.
A horizon
Hue - 7.5YR, 10YR, or 2.5Y
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Clay content - 12 to 20 percent
Rock fragments - 0 to 15 percent gravel
Volcanic glass content - 5 to 20 percent
Acid-oxalate extract A1+1/2 Fe - 0.4 to 1.2 percent
AB horizon
Hue - 7.5YR, 10YR, or 2.5Y
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 3 or 4 dry, 2 or 3 moist
Clay content - 16 to 25 percent
Rock fragments - 0 to 5 percent cobbles, 10 to 30 percent gravel and 10 to 35 percent total
Volcanic glass content - 5 to 20 percent
Acid-oxalate extract A1+1/2 Fe - 0.4 to 1.2 percent
2Bt (or 2Bw) horizon
Hue - 7.5YR, 10YR, or 2.5Y
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 3 or 4 dry or moist
Clay content - 18 to 27 percent
Rock fragments - 5 to 25 percent cobbles, 30 to 50 percent gravel and 35 to 75 percent total
Clay films - none or few
COMPETING SERIES: These are the Bearspring, Cassal, Cherrycreek, Eastpine, Egyptcreek, Fredonyer, Midpeak, Mineral, Peahke, Scoap, Shalrock, Shilling, Umatilla and Yellcreek series. Bearspring, Cherrycreek, Eastpine, Midpeak, Mineral, Scoap, Shalrock and Yellcreek have less than 18 percent clay in the particle-size control section. Cassal soils are moderately well drained with distinct redox features at 30 to 45 inches. Eastpine, Egyptcreek, Fredonyer, Midpeak, Mineral, Peahke, and Shalrock soils are moderately deep to a lithic contact. Shilling soils are greater than 60 inches deep and have mollic epipedons less than 20 inches thick. Umatilla soils are greater than 60 inches deep.
GEOGRAPHIC SETTING: Longs soils are on mountain slopes at elevations of 3,750 to 6,800 feet. These soils formed in colluvium and residuum from basalt and welded tuff mixed with volcanic ash in the upper part. Slopes range from 15 to 65 percent. The average annual precipitation is 26 to 36 inches. The average annual temperature is 40 to 45 degrees F. The frost-free period is 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Highvalley and Hoff soils. Highvalley soils are on mountain slopes and ridges and are very deep and fine-loamy. Hoff soils are on mountain ridges and are shallow to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; moderate permeability.
USE AND VEGETATION: Longs soils are used mainly for timber production and woodland grazing. Native vegetation is Douglas-fir, ponderosa pine and mallow ninebark.
DISTRIBUTION AND EXTENT: West-central Idaho. MLRA 43b. Longs soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Boise County Area, Idaho, Parts of Ada and Boise Counties, 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon - zone from the mineral soil surface to 44 inches. (A, AB and 2Bt1 horizons)
Vitrandic feature - zone from the mineral soil surface to 29 inches (A and AB horizons)
Cambic horizon - zone from 44 to 49 inches (2Bt2 horizon)
Particle-size control section - zone from 11 to 41 inches
Lithic contact - at 49 inches (2R)
The 2Bt horizon from 29 to 49 inches does not have enough clay increase to qualify for an argillic horizon.
All depths related to diagnostic horizons and features listed in the range of characteristics are measured from the top of the first mineral horizon.