LOCATION FULVANCE COEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Ustic Haplocryalfs
TYPICAL PEDON: Fulvance very cobbly sandy loam, on a south facing, linear, 45 percent slope in coniferous forest at an elevation of 9,700 feet. (Colors are for dry soil unless otherwise noted.) When described on August 8, 1991 the soil was dry throughout. The surface is covered by 2 percent stones.
Oi--0 to 1 inch; partially decomposed plant material; 30 percent gravel, 5 percent cobbles; abrupt smooth boundary. (1 to 3 inches thick)
E1--1 to 5 inches; brown (7.5YR 5/2) very cobbly sandy loam, brown (7.5YR 4/2) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common fine and medium roots; few very fine tubular pores; 25 percent gravel; 15 percent cobbles; slightly acid (pH 6.2); clear smooth boundary.
E2--5 to 14 inches; light brownish gray (10YR 6/2) very cobbly sandy loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common fine and medium roots; few very fine tubular pores; 25 percent gravel, 15 percent cobbles, 5 percent stones; neutral (pH 6.6); gradual wavy boundary. (The combined thickness of the E horizons is 5 to 17 inches)
Bt1--14 to 35 inches; pale brown (10YR 6/3) very cobbly sandy clay loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine, fine, and medium roots; few very fine tubular pores; few discontinuous faint clay films on faces of peds; few patchy faint pinkish gray (7.5YR 7/2) skeletans on faces of peds; 25 percent gravel, 15 percent cobbles. 5 percent stones; neutral (pH 6.6); gradual wavy boundary.
Bt2--35 to 55 inches; brown (10YR 5/3) extremely stony clay loam, brown (10YR 4/3) moist; weak fine prismatic structure parting to moderate fine and medium subangular blocky; hard, firm, moderately sticky and moderately plastic; few very fine, fine, and medium roots; few very fine tubular pores; common continuous clay films on faces of peds; 20 percent gravel, 20 percent cobbles; 20 percent stones, 5 percent boulders; neutral (pH 6.8); gradual wavy boundary.
Bt3--55 to 66 inches; light brownish gray (10YR 6/2) extremely stony clay loam, brown (10YR 4/3) moist; moderate medium prismatic structure parting to moderate fine and medium subangular blocky; hard firm, moderately sticky and moderately plastic; common continuous clay films on faces of peds; 20 percent gravel, 20 percent cobbles; 20 percent stones, 5 percent boulders; neutral (pH 6.8);. (The combined thickness of the Bt horizons is 31 to 61 inches)
TYPE LOCATION: Routt County, Colorado; about 10 miles southeast of Toponas; located about 700 feet east and 2,000 feet south of the northwest corner of sec. 12, T. 1 S., R. 83 W.; McCoy USGS quad; lat. 39 degrees 59 minutes 9 seconds N. and long. 106 degrees 38 minutes 27 seconds W., NAD 83.
RANGE IN CHARACTERISTICS: (Depths given are measured from the mineral soil surface)
Soil moisture regime subclass: ustic
Soil moisture regime class: udic
Mean annual soil temperature: 37 to 43 degrees F.
Mean summer soil temperature: 43 to 54 degrees F.
Depth to argillic horizon: 10 to 22 inches (25 to 56 centimeters)
Thickness of albic horizon: 11 to 20 inches (28 to 51 centimeters)
Thickness of argillic horizon: 20 to 46 inches (51 to 104 centimeters)
Base saturation: 70 to 100 percent (estimated)
Particle-size control section (weighted average):
Clay content: 25 to 35 percent
Rock fragment content: 40 to 70 percent
A horizon(present in some pedons)
Thickness: 1 to 4 inches
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3 dry; 1 or 2 moist
Texture: cobbly loam
Clay content: 7 to 18 percent
Rock fragment content: 15 to 34 percent
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
E horizon, upper part (not in all pedons)
Hue: 7.5YR, 10YR
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 or 3, dry or moist
Texture: very cobbly sandy loam
Clay content: 10 to 20 percent
Fragment content, total: 20 to 50 percent
Fragment size and content: 15 to 30 percent gravel
5 to 20 percent cobbles
0 to 5 percent stones
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
E horizon, lower part (entire E horizon in some pedons)
Hue: 7.5YR, 10YR
Value: 6 or 7 dry; 4 or 5 moist
Chroma: 2 or 3, dry or moist
Texture: cobbly sandy loam, very cobbly sandy loam, gravelly loam, gravelly sandy loam, very cobbly loam
Clay content: 7 to 20 percent
Fragment content, total: 20 to 60 percent
Fragment size and content: 15 to 35 percent gravel
5 to 25 percent cobbles
0 to 5 percent stones
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
Bt horizon, upper part (not in all pedons)
Hue: 7.5YR, 10YR
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 or 3, dry or moist
Texture: very cobbly clay loam, very stony sandy clay loam, very cobbly sandy clay loam, cobbly clay loam
Clay content: 25 to 35 percent
Fragment content, total: 25 to 65 percent
Fragment size and content: 15 to 30 percent gravel
10 to 30 percent cobbles
0 to 10 percent stones
Reaction: neutral (pH 6.6 to 7.3)
Bt horizon, lower part (entire Bt horizon in some pedons)
Hue: 7.5YR, 10YR
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 to 4, dry or moist
Texture: extremely stony clay loam, very stony sandy clay loam, very stony clay loam, extremely stony sandy clay loam, extremely cobbly clay loam, extremely cobbly sandy clay loam
Clay content: 25 to 35 percent
Fragment content, total: 35 to 85 percent
Fragment size and content: 15 to 45 percent gravel
10 to 45 percent cobbles
0 to 25 percent stones
0 to 8 percent boulders
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
BC or C horizon (present in some pedons):
Hue: 10YR or 7.5YR
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 3 or 4 dry; 3 or 4 moist
Texture: extremely cobbly sandy loam
Clay content: 10 to 20 percent
Rock fragment content: 60 to 80 percent
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
COMPETING SERIES: These are the
Cadotte,
Cloud Peak,
Cundiyo,
Edloe,
Goosepeak,
Guffey,
Hyattville,
Kimpton,
Lake Creek,
Lakehelen,
Laveta,
Lulude,
Reinecker, and
Tepecreek series.
Cadotte soils have a lithologic discontinuity at 20 to 40 inches.
Cundiyo soils have less than 18 percent clay in the control section.
Cloud Peak, Edloe, Guffey, Hyattville, Kimpton, Lake Creek, Lakehelen, Laveta, Lulude, and Tepecreek soils are moderately deep to a lithic or paralithic contact.
Goosepeak soils have rock fragments derived from andesite, rhyolite, breccia, or tuff.
Reinecker soils have accumulations of secondary carbonates.
GEOGRAPHIC SETTING:
Parent material: colluvium and slope alluvium derived from sandstone and shale.
Landform: mountain slopes and hills
Slopes: 3 to 65 percent
Elevation: 7,600 to 11,100 feet
Mean annual air temperature: 35 to 41 degrees F.
Mean annual precipitation: 14 to 25 inches
Precipitation pattern: Precipitation is relatively evenly distributed throughout the year, including a significant amount in July and August.
Frost-free period: 50 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dorpat, Lintim, and Menbar series. The Dorpat and Lintim soils have less than 35 percent rock fragments in the control section and are on similar landforms. The Menbar soils are somewhat poorly drained and are on flood plains.
DRAINAGE AND PERMEABILITY: well drained, high or very high runoff, moderately slow permeability.
USE AND VEGETATION: The major uses are timber production, livestock grazing, recreation, and wildlife habitat. Native vegetation is Rocky Mountain Douglas fir, lodgepole pine, subalpine fir, aspen, heartleaf arnica, and elk sedge.
DISTRIBUTION AND EXTENT: Northwest and Central Colorado; LRR E, MLRA 48A; moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Teller-Park soil survey area, Colorado, 2010. The typical pedon is in Routt County, Colorado, Routt Area soil survey area, where this series was proposed in 1999. The name Fulvance is coined.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 14 to 34 inches. (upper part of Bt1 horizon)
Ochric epipedon and albic horizon: The zone from 1 to 14 inches. (E1 and E2 horizons)
Argillic horizon: The zone from 14 to 66 inches. (Bt1, Bt2, and Bt3 horizons)
The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.
Taxonomic Version: Eleventh Edition, 2010.