LOCATION SPINNEY COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Histic Cryaquolls
TYPICAL PEDON: Spinney mucky peat, on a 1 percent slope in a wet meadow at an elevation of 9,550 feet (2911 meters). (Colors are for dry soil unless otherwise noted.) When described on August 2, 1988 the soil was wet throughout.
Oe--0 to 10 inches; mucky peat; clear smooth boundary.
A--10 to 18 inches; very dark gray (7.5YR 3/1) loam, black (10YR 2/1) moist; moderate fine granular structure; friable, slightly hard, slightly sticky, slightly plastic; slightly acid (pH 6.2); clear smooth boundary.
Ag--18 to 26 inches; gray (10YR 5/1) very gravelly sandy clay loam, very dark gray (10YR 3/1) moist; weak very fine subangular structure; friable, slightly hard, slightly sticky, slightly plastic; 15 percent cobbles and 25 percent gravel; neutral (pH 7.0); clear smooth boundary.
Cg1--26 to 32 inches; light yellowish brown (2.5Y 6/3) gravelly sandy clay loam, yellowish brown (10YR 5/6) moist; massive; friable, slightly hard, slightly sticky, slightly plastic; common distinct dark greenish gray (5BG 4/1) and greenish gray (5G 5/1) iron depletions; 5 percent cobbles and 15 percent gravel; neutral (pH 7.2); gradual smooth boundary.
Cg2--32 to 60 inches; gray (5Y 6/1) gravelly sandy loam, dark gray (5Y4/1) moist; massive; friable, slightly hard, slightly sticky, slightly plastic; 5 percent cobbles and 20 percent gravel; moderately acid (pH 6.0).
TYPE LOCATION: Park County, Colorado; about 10 kilometers (6 miles) northeast of Como; located about 600 feet south and 600 feet west of the northeast corner of section 14, T 8 S, R 76 W; Milligan Lakes USGS quad; lat. 39 degrees 21 minutes 42 seconds N. and long. 105 degrees 50 minutes 48 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: aquic regime
Mean annual soil temperature: 37 to 42 degrees F.
Mean summer soil temperature: 43 to 46 degrees F.
Thickness of histic epipedon: 8 to 12 inches (20 to 30 centimeters)
Thickness of mollic epipedon: 10 to 16 inches (25 to 41 centimeters)
Depth to aquic conditions and endosaturation: 0 to 10 inches (0 to 25 centimeters)
Depth to redox depletions with chroma 2 or less: 8 to 18 inches (20 to 46 centimeters)
Base saturation: 50 to 100 percent throughout (estimated)
Particle-size control section (weighted averages):
Clay content: 20 to 35 percent
Rock fragment content: 20 to 34 percent
A horizon:
Hue: 10YR or 7.5YR
Value: 2 or 3 dry; 2 or 3 moist
Chroma: 1 through 3 dry; 1 through 3 moist
Clay content: 18 to 27 percent
Rock fragment content: 0 to 3 percent
Reaction: slightly acid to slightly alkaline (pH 6.1 to 7.8)
Ag horizon:
Hue: 10YR or 2.5Y
Value: 3 through 5 dry; 2 or 3 moist
Chroma: 1 through 3 dry; 1 through 3 moist
Texture: very gravelly sandy clay loam, very gravelly loam
Clay content: 20 to 35 percent
Rock fragment content: 35 to 50 percent
Reaction: neutral or slightly alkaline (pH 6.6 to 7.8)
Cg horizon, upper part:
Hue: 10YR through 5Y
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 3 through 6 dry; 3 through 6 moist
Texture: gravelly sandy clay loam, gravelly sandy loam
Clay content: 7 to 35 percent
Rock fragment content: 15 to 34 percent
Reaction: moderately acid to slightly alkaline (pH 5.6 to 7.8)
Cg horizon, lower part:
Hue: 2.5Y or 5Y
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 1 through 3 dry; 1 through 3 moist
Texture: gravelly sandy loam
Clay content: 7 to 18 percent
Rock fragment content: 15 to 34 percent
Reaction: moderately acid to slightly alkaline (pH 5.6 to 7.8)
COMPETING SERIES: This is the
Boquet series.
The Boquet soils have less than 15 percent rock fragments in the middle horizons, above a lithologic discontinuity with gravelly and very gravelly textures.
GEOGRAPHIC SETTING:
Parent material: alluvium
Landform: flood plains
Slopes: 0 to 1 percent
Elevation: 2438 to 3109 meters (8,000 to 10,200 feet)
Mean annual temperature: 1.7 to 4.4 degrees C (35 to 40 degrees F)
Mean annual precipitation: 254 to 584 mm (10 to 23 inches)
Frost-free period: 50 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the Platdon series. The Platdon soils do not have a histic epipedon.
DRAINAGE AND PERMEABILITY: Very poorly drained, moderately slow permeability, occasionally flooded for brief periods during the months of April through August.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation consists mainly of tufted hairgrass, Nebraska sedge, slender wheatgrass, Baltic rush, and ovalhead sedge.
DISTRIBUTION AND EXTENT: Central Colorado; LRR E, MLRA 48A, 48B; moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Park County, Colorado, 2010; Teller-Park Area soil survey area, Colorado. The name is taken from Spinney Mountain from the southern part of Park County.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from 0 to 60 inches.
Particle-size control section: The zone from 20 to 50 inches (part of the Ag, Cg1, part of the Cg2 horizon)
Histic epipedon: from 0 to 25 cm. (Oe horizon)
Mollic epipedon: from 25 to 66 cm. (A, Ag horizons)
Redoximorphic depletions: In the zone from 46 to 81 cm. (Ag, Cg1 horizons)
Endosaturation and aquic conditions: The zone from 0 to 152 cm. (entire pedon)
Irregular decrease in organic matter: inferred from textural variability and landscape position.
The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.
Taxonomic Version: Classified according to Keys to Soil Taxonomy, 11th Edition, 2010.