LOCATION TALLCREEK MTEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, active, frigid Vitrandic Eutrudepts
TYPICAL PEDON: Tallcreek ashy silt loam, forested (colors are for dry soil unless otherwise noted).
Oi--0 to 1 inch; undecomposed and slightly decomposed forest litter.
A--1 to 5 inches; gray (10YR 5/1) ashy silt loam, very dark gray (10YR 3/1) moist; weak medium subangular blocky structure parting to weak fine granular; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium and many coarse roots; moderately acid (ph 6.0); gradual wavy boundary. (2 to 4 inches thick)
Bw--5 to 19 inches; light brownish gray (10YR 6/2) ashy silt loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium and few coarse roots; slightly alkaline (ph 7.6); gradual wavy boundary. (10 to 15 inches thick)
Bk--19 to 29 inches; light gray (5Y 7/2) silt loam, olive gray (5Y 5/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine masses of lime; slightly effervescent; slightly alkaline (ph 7.4); abrupt wavy boundary. (8 to 12 inches thick)
C1--29 to 35 inches; pale yellow (5Y 8/2) silty clay loam varved lacustrine material, light olive gray (5Y 6/2) moist; moderate medium platy structure; slightly hard, friable, moderately sticky and moderately plastic; few medium and coarse roots; slightly effervescent; slightly alkaline (ph 7.4); gradual wavy boundary. (5 to 10 inches thick)
C2--35 to 43 inches; pale yellow (5Y 8/2) silty clay loam varved lacustrine material, light olive gray (5Y 6/2) moist; massive; slightly hard, friable, moderately sticky and moderately plastic; common medium distinct yellowish brown (10YR 5/4) redox concentrations; slightly effervescent; slightly alkaline (ph 7.4); gradual wavy boundary. (5 to 10 inches thick)
C3--43 to 60 inches; pale yellow (5Y 8/2) very fine sandy loam varved lacustrine material, light olive gray (5Y 6/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common medium distinct yellowish brown (10YR 5/4) redox concentrations; slightly effervescent; slightly alkaline (ph 7.4).
TYPE LOCATION: Lincoln County, Montana; 1,500 feet east and 700 feet south of the NW corner of sec. 4, T. 26 N., R. 27 W.
RANGE IN CHARACTERISTICS:
Soil temperature - 44 to 47 degrees F.
Moisture control section - between 4 and 12 inches.
Depth to water table - 4 to 6 feet.
A horizon
Value: 5 or 6 dry, 3 or 4 moist
Chroma: 1 or 2
Clay content: 10 to 25 percent
Bulk density: 1.0 to 1.3 g/cm3
Glass content: 20 to 45 percent
Acid oxylate extractable Al + 1/2 Fe: 0.3 to 1.0 perent
Reaction: ph 5.6 to 7.3
Bw horizon
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 or 3
Clay content: 5 to 18 percent
Bulk density: 1.0 to 1.3 g/cm3
Glass content: 20 to 45 percent
Acid oxylate extractable Al + 1/2 Fe: 0.3 to 1.0 perent
Reaction: ph 6.1 to 7.8
Bk horizon
Value: 6 or 7 dry, 5 or 6 moist
Chroma: 1 or 2
Clay content: 5 to 18 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 7.4 to 8.4
C horizons
Value: 7 or 8 dry, 6 or 7 moist
Chroma: 1 or 2
Texture: very fine sandy loam, silt loam, and silty clay loam varved lacustrine material
Clay content: 5 to 32 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 7.4 to 8.4
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform- stream terraces, lake terraces, outwash terraces, lake plains.
Elevation - 3,300 to 4,000 feet.
Slope - 0 to 6 percent.
Parent material - glaciolacustrine deposits.
Climate - long, cold winters; moist springs; warm, dry summers.
Mean annual effective precipitation - 23 to 30 inches.
Mean annual temperature - 38 to 45 degrees F.
Frost-free period - 70 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
DRAINAGE AND PERMEABILITY: Moderately well drained, slow permeability.
USE AND VEGETATION: Tallcreek soils are used for woodland, understory grazing, and wildlife habitat. Potential native vegetation is mainly ponderosa pine, Douglas fir, western larch, grand fir, Engelmann spruce, white spruce, and water birch. The understory vegetation is mainly pinegrass, twinflower, huckleberry, queencup beadlilly, forbs, and shrubs.
DISTRIBUTION AND EXTENT: Tallcreek soils are of small extent in the valleys of northwestern Montana.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Lincoln County, Montana, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ash influenced layers - 1 to 19 inches (A, Bw horizons);
Ochric epipedon - 0 to 7 inches (Oi, A, Bw horizons);
Cambic horizon - 5 to 19 inches (Bw horizon);
Calcic horizon - 19 to 29 inches (Bk horizon); and
Particle-size control section - 10 to 40 inches (Bw, Bk, C1, C2 horizons).
Tallcreek soils have a frigid temperature regime and a udic moisture regime that borders on ustic.
ADDITIONAL DATA: Laboratory data S92MT-053-006; Soil interpretation record MT1358.