LOCATION SAGOLLOW IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Oxyaquic Argixerolls
TYPICAL PEDON: Sagollow silt loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 4 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; moderate very fine and fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and few fine and medium irregular pores; about 5 percent gravel; slightly acid (pH 6.4); gradual wavy boundary. (4 to 10 inches thick)
A/B--4 to 12 inches; 60% dark grayish brown (10YR 4/2) and 40% brown (10YR 5/3) silt loam, very dark brown (10YR 2/2) and dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and few fine tubular and irregular pores; about 10 percent gravel; slightly acid (pH 6.4); gradual wavy boundary. (0 to 18 inches thick)
Bt1--12 to 22 inches; brown (10YR 5/3) cobbly silty clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots; many very fine, few fine, and common medium tubular pores; few patchy faint clay films on faces of peds, in pores and root channels; about 10 percent gravel and 10 percent cobbles; neutral (pH 6.6); clear wavy boundary. (5 to 15 inches thick)
Bt2--22 to 26 inches; brown (10YR 5/3) very cobbly silty clay loam, dark brown (10YR 3/3) moist; common fine prominent dark yellowish brown (10YR 4/6) redox concentrations; moderate fine and medium subangular blocky structure; very hard, very firm, very sticky and very plastic; common very fine roots; many very fine, few fine, and common medium tubular pores; few patchy faint clay films on faces of peds, in pores and root channels; about 15 percent gravel and 30 percent cobbles; neutral (pH 6.6); gradual wavy boundary. (3 to 15 inches thick)
Bt3--26 to 45 inches; brown (10YR 5/3) extremely cobbly clay loam, brown (10YR 4/3) moist; many fine and medium prominent strong brown (7.5YR 5/6) redox concentrations; strong fine and medium subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine roots; many very fine, few fine, and common medium tubular pores; few patchy faint clay films on faces of peds, in pores and root channels; about 30 percent gravel and 50 percent cobbles; neutral (pH 6.6); gradual wavy boundary. (0 to 25 inches thick)
Bt4--45 to 60 inches; brown (10YR 5/3) extremely cobbly clay loam, brown (10YR 4/3) moist; many fine and medium prominent strong brown (7.5YR 5/6) redox concentrations; strong medium subangular blocky structure; very hard, very firm, very sticky and very plastic; many very fine, few fine, and common medium tubular pores; few patchy faint clay films on faces of peds, in pores and root channels; about 20 percent gravel and 60 percent cobbles; neutral (pH 6.8). (0 to 25 inches thick)
TYPE LOCATION: Bear Lake County, Idaho; about 2 miles northwest of Sharon; about 600 feet south and 900 feet east of the northwest corner of section 24, T.12 S., R.44 E.; USGS Midnight Mountain 7.5 minute topographic quadrangle; 42 degrees, 22 minutes, 13 seconds north latitude, 111 degrees, 30 minutes, 07 seconds west longitude, NAD 27.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 15 to 35 inches (commonly extends into the argillic
horizon)
Depth to redox features and seasonal high water table - 20 to 40 inches; redox
depletions with chroma of 2 or less may occur below 40 inches in some pedons;
saturation occurs for 30 or more cumulative days per year in 6 out of 10 years
Average annual soil temperature - 41 to 44 degrees F.
Particle-size control section:
Clay content - averages 25 to 35 percent
Rock fragment content - 35 to 70 percent (10 to 35 percent gravel, 10 to 60 percent cobbles and stones)
A horizon
Hue - 10YR
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 to 3 dry or moist
Texture - silt loam
Clay content - 18 to 27 percent
Rock fragment content - 0 to 15 percent (0 to 10 percent gravel, 0 to 5 percent cobbles)
Reaction - slightly acid or neutral (pH 6.2 to 7.2)
A/B horizon (some pedons may have B/A, AB, BA, or A1, A2 and A3 horizons)
Hue - 10YR
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 to 3 dry or moist
Texture - loam, silt loam, silty clay loam or their gravelly, very gravelly, cobbly, or very cobbly analogues
Clay content - 20 to 30 percent
Rock fragment content - 0 to 60 percent (0 to 25 percent gravel, 0 to 60 percent cobbles)
Reaction - slightly acid or neutral (pH 6.2 to 7.2)
Bt horizons
Hue - 10YR or 7.5YR
Value - 4 to 6 dry, 3 or 4 moist
Chroma - 2 to 4 dry or moist
Texture - gravelly loam, gravelly silt loam, gravelly clay loam, gravelly silty clay loam, cobbly silty clay loam, gravelly silty clay, gravelly clay or their very gravelly, extremely gravelly, very cobbly or extremely cobbly analogues
Clay content - 25 to 35 percent in the upper part, 25 to 45 percent below 40 inches
Rock fragment content -35 to 80 percent (10 to 35 percent gravel, 10 to 60 percent cobbles and stones)
Reaction - neutral or slightly alkaline (pH 6.6 to 7.4)
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform: stream terraces, drainageways and dissected fan remnants
Elevation: 5,900 to 7,000 feet
Slope: 0 to 10 percent
Parent material: silty and clayey alluvium from mixed sources
Climate: long, cold winters; moist springs; warm, dry summers
Average annual precipitation: 16 to 24 inches
Average annual temperature: 39 to 45 degrees F.
Frost-free season: 70 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Nythar, Streek and Swanpeak soils. Nythar soils are fine-loamy, and very poorly drained. They are mainly in the bottom of drainageways. Streek and Swanpeak soils are clayey and are mainly on adjacent uplands.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; very low to low surface runoff; moderately slow permeability.
USE AND VEGETATION: Sagollow soils are used mainly for rangeland and pasture. Native vegetation is mainly mountain big sagebrush, mules ear, snowberry, willow, onion grass, yarrow, baltic rush, and mixed grasses.
DISTRIBUTION AND EXTENT: Sagollow soils are of small extent in southeastern Idaho. MLRA 9.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Bear Lake County, Idaho, 2008. The name is coined from nearby Sago Hollow.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the soil surface to 26 inches (the A, A/B, Bt1 and Bt2 horizons).
Argillic horizon - the zone from 12 to 60 inches (the Bt1, Bt2, Bt3 and Bt4 horizons)