LOCATION REDSPOON COEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Ustic Haplocryolls
TYPICAL PEDON: Redspoon loamy fine sand - on an 8 percent slope in an area of rangeland at an elevation of 9,120 feet. (Colors are for dry soil unless otherwise noted.) Described on June 21, 1988. Reactions are field-measured.
A1--0 to 4 inches; brown (7.5YR 4/3) loamy fine sand, dark brown (7.5YR 3/2) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; 10 percent gravel; slightly alkaline (pH 7.4); abrupt smooth boundary. (3 to 6 inches thick)
A2--4 to 8 inches; brown (7.5YR 4/3) very fine sandy loam, dark brown (7.5YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; 10 percent gravel; neutral (pH 7.2); abrupt smooth boundary. (0 to 5 inches thick)
Bw1--8 to 12 inches; yellowish red (5YR 5/6) parachannery very fine sandy loam, yellowish red (5YR 4/6) moist; weak fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; 20 percent parachanners; slightly alkaline (pH 7.4); abrupt smooth boundary. (4 to 8 inches thick)
Bw2--12 to 25 inches; reddish yellow (5YR 6/6) extremely parachannery very fine sandy loam, yellowish red (5YR 4/6) moist; weak fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; 65 percent parachanners; neutral (pH 7.2); clear smooth boundary. (0 to 8 inches thick)
Crk--25 to 35 inches; few fine calcium carbonate masses; moderately cemented sandstone.
TYPE LOCATION: Park County, Colorado; about 6 miles west of Hartsel, about 600 feet south and 1,100 feet east of the northwest corner of Sec. 5, T. 12 S., R. 76 W. Garo USGS quad; Latitude 39 degrees, 02 minutes, 27 seconds N; Longitude 105 degrees, 55 minutes, 03 seconds W, NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is usually dry in late spring and early summer, moist in some part in late July and August, and intermittently dry in fall; ustic regime bordering on aridic.
Mean annual soil temperature: 37 to 41 degrees F.
Mean summer soil temperature: 51 to 58 degrees F.
Thickness of mollic epipedon: 7 to 10 inches
Depth to cambic horizon: 7 to 10 inches
Depth to secondary carbonates: 20 to 30 inches
Depth to paralithic contact: 20 to 40 inches
Lithology of rock fragments: sandstone
Particle-size control section (weighted average):
Clay content: 7 to 10 percent
Sand content: 70 to 80 percent
Rock fragment content: 5 to 15 percent
A horizons
Hue: 7.5YR through 2.5YR
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 3 to 5 dry; 2 or 3 moist
Texture: loamy fine sand, very fine sandy loam
Clay content: 7 to 18 percent
Gravel content: 5 to 15 percent
Reaction: neutral or slightly alkaline (pH 6.6 to 7.8)
Bw horizons
Hue: 5YR or 2.5YR
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 3 to 6 dry; 3 to 6 moist
Texture: parachannery very fine sandy loam, very parachannery very fine sandy loam, extremely parachannery very fine sandy loam
Clay content: 8 to 18 percent
Parachanner content: 15 to 80 percent
Calcium carbonate equivalent: 0 to 2 percent
Reaction: neutral to moderately alkaline (pH 6.6 to 8.4)
Bk horizon (present in some pedons)
Hue: 5YR or 2.5YR
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 3 to 6 dry; 3 to 6 moist
Texture: parachannery very fine sandy loam, very parachannery fine sandy loam, extremely parachannery very fine sandy loam
Clay content: 8 to 18 percent
Parachanner content: 15 to 80 percent
Calcium carbonate equivalent: 1 to 5 percent
Reaction: moderately alkaline (pH 7.9 to 8.4)
COMPETING SERIES: These are the
Branham,
Clergern,
Danielvil,
Dinnen,
Levenmile,
Martland,
Sawcreek,
Sula, and
Teoculli series.
The Clergern, Danielvil, Dinnen, Levenmile, Sula, and Teoculli soils are very deep.
Branham soils have a lithic contact at 20 to 40 inches.
Martland soils have rock fragments of granodiorite, gneiss, and schist.
Sawcreek soils do not border an aridic moisture regime.
GEOGRAPHIC SETTING:
Parent material: slope alluvium from sandstone, typically the Pennsylvanian-age Minturn Formation.
Landform: pediments
Slopes: 2 to 20 percent
Elevation: 8,700 to 10,000 feet
Mean annual temperature: 35 to 39 degrees F.
Mean annual precipitation: 10 to 16 inches
Precipitation pattern: Monthly precipitation is lowest in winter and greatest in July and August.
Frost-free period: 50 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cablon and Chubbs series. Cablon soils are very deep, are sandy-skeletal in the particle-size control section, have a calcic horizon, and are on outwash terraces. Chubs soils are shallow to sandstone.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation consists of Arizona fescue, slimstem muhly, prairie junegrass, western wheatgrass, blue grama, bottlebrush squirreltail, and needleandthread.
DISTRIBUTION AND EXTENT: Intermontane basins and valleys of Colorado; MLRA 48B. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Park County (Teller-Park Soil Survey Area), Colorado, 2010. The name is coined.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from 0 to 35 inches.
Particle-size control section: The zone from 10 to 25 inches. (part of the Bw1, and the Bw2 horizons)
Mollic epipedon: The zone from 0 to 8 inches. (A1, A2 horizons)
Cambic horizon: The zone from 8 to 25 inches. (Bw1, Bw2 horizons)
Paralithic contact: The contact with sandstone at 25 inches. (Crk layer)
Taxonomic Version: classified according to Keys to Soil Taxonomy, Tenth edition, 2006.
ADDITIONAL DATA: This pedon was sampled for the NSSL, soil survey sample number S88-CO-093-004, Lab Pedon No. 0981.