LOCATION LONGBAR IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Hapludolls
TYPICAL PEDON: Longbar loam, fern glade, on a 40 percent slope at 2,800 feet elevation. Aspect is south. When described on July 13, 1995 the soil was moist throughout. (Colors are for dry soil unless otherwise indicated).
Oi--0 to 1 inch; undecomposed leaves, twigs, and stems.
Oe--1 to 2 inches; decomposed leaves, twigs, and stems.
A--2 to 6 inches; dark gray (10YR 4/1) loam, black (10YR 2/1) moist; weak fine and medium subangular blocky structure parting to moderate fine and very fine granular; slightly hard, friable, nonsticky and slightly plastic; many fine and medium, and common coarse roots; many very fine and fine irregular pores; 1 percent fine mica flakes; 5 percent fine gravel; moderately acid (pH 6.0); clear smooth boundary. (4 to 6 inches thick)
BAt--6 to 12 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine and common coarse roots; many very fine and fine irregular pores; few discontinuous faint very dark brown (10YR 2/2) clay films on faces of peds; 1 percent fine mica flakes; 10 percent fine gravel; moderately acid (pH 5.8); clear irregular boundary. (6 to 18 inches thick)
Bt1--12 to 18 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate medium to coarse subangular blocky structure; slightly hard, firm, slightly sticky and moderately plastic; common very fine and fine roots throughout, few coarse roots between peds; common very fine and fine irregular and tubular pores; common continuous faint very dark grayish brown (10YR 3/2) clay films on faces of peds; 2 percent fine mica flakes; 10 percent gravel; moderately acid (pH 5.6); clear wavy boundary.
Bt2--18 to 28 inches; pale brown (10YR 6/3) loam, dark yellowish brown (10YR 4/4) moist; moderate medium to coarse subangular blocky structure, slightly hard, firm, slightly sticky and slightly plastic; common fine to coarse roots between peds; common very fine tubular pores; common continuous faint brown (10YR 4/3) clay films on faces of peds and in pores; 3 percent fine mica flakes; 10 percent gravel; moderately acid (pH 5.6); clear wavy boundary. (Bt horizons 16 to 25 inches thick)
BC--28 to 41 inches; very pale brown (10YR 7/4) gravelly sandy loam, yellowish brown (10YR 5/4) moist; moderate medium to coarse subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; common fine and medium, few coarse roots between peds, common very fine roots throughout; few very fine tubular pores; few discontinuous faint dark yellowish brown (10YR 4/4) clay films on faces of peds; 10 percent very fine and fine mica flakes; 15 percent gravel; strongly acid (pH 5.5); clear smooth boundary. (0 to 15 inches thick)
C1--41 to 50 inches; very pale brown (10YR 7/4) sandy loam, yellowish brown (10YR 5/6) moist; weak medium to coarse subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine, few coarse roots between peds, few very fine roots throughout; few very fine tubular pores; few fine horizontal clay bands; 15 percent very fine and fine mica flakes; 5 percent gravel; strongly acid (pH 5.5); clear smooth boundary. (9 to 21 inches thick)
C2--50 to 62 inches; pale yellow (2.5Y 7/4) loamy sand, light yellowish brown (2.5Y 6/4) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine and coarse roots between cracks; few fine horizontal clay bands; 15 percent very fine and fine mica flakes; 5 percent gravel; strongly acid (pH 5.4).
TYPE LOCATION: Clearwater County, Idaho; about 16 miles north of Headquarters, Idaho; about 1,600 feet north and 350 feet east of the southwest corner of sec. 23, T.41N., R5E.; Latitude - 46 degrees, 52 minutes, 52 seconds North; Longitude - 115 degrees, 47 minutes, 47 seconds West; USGS Little Goat Mountains Quadrangle.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 39 to 45 degrees F. (Frigid temperature regime)
Soil moisture regime - usually moist year round and not dry for 45 or more consecutive days from June to October. (Udic moisture regime)
Thickness of mollic epipedon - 9 to 16 inches
A horizon
Value - 2 or 3 moist
Chroma - 1 or 2 dry or moist
Clay content - 12 to 24 percent
Rock fragments - 0 to 5 percent gravel
BAt horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 to 4 dry or moist
Textures - SIL, L
Clay content - 16 to 24 percent
Rock fragments - 0 to 10 percent gravel
Bt horizons
Value - 5 or 6 dry, 3 to 5 moist
Chroma - 3 or 4 dry or moist
Textures - L, CL, GR-CL, FSL
Clay content - 22 to 28 percent
Rock fragments - 0 to 15 percent gravel, 0 to 3 percent cobbles; total rock fragment content is 0 to 20 percent
BC horizon
Value - 4 or 5 moist
Textures - L, SL, GR-SL
Clay content - 14 to 20 percent
Rock fragments - 0 to 15 percent gravel, 0 to 3 percent cobbles, total rock fragment content is 0 to 15 percent.
Reaction - strongly acid or moderately acid
C horizons
Hue - 10YR or 2.5Y
Value - 5 or 6 moist
Chroma - 4 or 6 dry or moist
Textures - L, SL, LS, LCOS
Clay content - 7 to 20 percent
Rock fragments - 0 to 13 percent gravel, 0 to 5 percent cobbles, total rock fragment content is 0 to 13 percent.
Reaction - strongly acid or moderately acid
COMPETING SERIES: This is the Edgeley series. Edgeley soils are moderately deep to a paralithic contact.
GEOGRAPHIC SETTING: Longbar soils are on mountain slopes at elevations of 1,600 to 3,400 feet. Slopes are 15 to 65 percent. These soils are formed in material from anorthosite. The average annual temperature is 38 to 44 degrees F. and the average annual precipitation is 30 to 45 inches. The frost-free season is 50 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bigtalk(T), Noil, Floodwood and Keeler series. Bigtalk soils are on mountain slopes and have a ochric epipedon. Noil soils are on steep mountain slopes and are deep to weathered bedrock. Floodwood soils are on gentle mountain slopes and have a volcanic ash cap that is not mixed. Keeler soils are on mountain slopes, have 2Bt horizons and an ochric epipedon.
DRAINAGE AND PERMEABILITY: Well drained, rapid to very rapid runoff, moderate permeability.
USE AND VEGETATION: These soils are used for watershed and wildlife habitat. Potential natural vegetation is bracken fern, snow raspberry, wild ginger, American trailplant, St. Johnswort, western hawkweed, mountain thermopsis, mallow ninebark, creambrush oceanspray, and white spirea.
DISTRIBUTION AND EXTENT: Northern Idaho. Longbar soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Clearwater County, Idaho, 2003.
REMARKS: Diagnostic horizons and other features recognized in this pedon are:
Mollic epipedon - the zone from the mineral soil surface to 18 inches (A, BAt and Bt1 horizons).
Argillic horizon - the zone from 12 to 28 inches (Bt1 and Bt2 horizons).
Particle-size control section - the zone from 12 to 28 inches (Bt1 and Bt2 horizons).
ADDITIONAL DATA: This pedon has laboratory data - S95ID-035-001 (96P 18) Clearwater County, Idaho; by NSSL, Lincoln, NE.