LOCATION HARTBUCKLE COEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed Ustic Calcicryolls
TYPICAL PEDON: Hartbuckle fine sandy loam, 1 percent slope in grassland at an elevation of 2,652 meters (8,700 feet). (Colors are for dry soil unless otherwise noted.) Described on September 17, 1992.
Oa--0 to 3 cm (0 to 1 inch); highly decomposed organic matter.
A1--3 to 8 cm (1 inch to 3 inches); brown (10YR 5/3) fine sandy loam, very dark brown (10YR 2/2) moist; weak thick platy structure; slightly hard, very friable, slightly sticky and slightly plastic; few fine faint brown (7.5YR 5/4) masses of iron accumulation (relict); 10 percent gravel; 7 percent calcium carbonate equivalent; slightly alkaline (pH 7.4); abrupt smooth boundary.
A2--8 to 20 cm (3 to 8 inches); brown (10YR 5/3) fine sandy loam, dark brown (10YR 3/3) moist; weak thick platy structure; slightly hard, very friable, slightly sticky and slightly plastic; few fine faint brown (7.5YR 5/4) masses of iron accumulation (relict); 10 percent gravel; very slightly effervescent; 6 percent calcium carbonate equivalent; slightly alkaline (pH 7.4); abrupt smooth boundary. (combined thickness of the A horizons is 10 to 20 cm)
Bk1--20 to 36 cm (8 to 14 inches); brown (10YR 5/3) extremely gravelly coarse sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few carbonate coats on bottom of rock fragments and few medium carbonate masses in the matrix; 70 percent gravel; very slightly effervescent; 9 percent calcium carbonate equivalent; slightly alkaline (pH 7.4); abrupt smooth boundary.
Bk2--36 to 155 cm (14 to 61 inches); very pale brown (10YR 7/3) extremely gravelly coarse sand, pale brown (10YR 6/3) moist; single grain; loose, nonsticky and nonplastic; few carbonate coats on bottom of rock fragments and few medium carbonate masses in the matrix; 65 percent gravel, 5 percent cobbles; very slightly effervescent; 6 percent calcium carbonate equivalent; slightly alkaline (pH 7.6). (combined thickness of the Bk horizons is 117 to 127 cm)
TYPE LOCATION: Park County, Colorado; about 11 kilometers (7 miles) east of Hartsel; located about 900 feet north and 900 feet west of the southeast corner of Sec. 16, T. 12 S., R. 74 W.; Sulphur Mountain USGS quad; lat. 39 degrees 00 minutes 05 seconds N. and long. 105 degrees 39 minutes 59 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: 2.8 to 5.0 degrees C (37 to 41 degrees F)
Mean summer soil temperature: 10.6 to 14.4 degrees C (51 to 58 degrees F)
Depth to secondary calcium carbonate: 18 to 30 cm (7 to 12 inches)
Depth to calcic horizon: 18 to 30 cm (7 to 12 inches)
Thickness of the mollic epipedon: 18 to 30 cm (7 to 12 inches)
Particle-size control section (weighted averages):
Clay content: 2 to 10 percent
Rock fragment content: 60 to 75 percent
A horizons
Hue: 10YR, 7.5YR
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 2 or 3 dry; 2 or 3 moist
Clay content: 12 to 18 percent
Gravel content: 5 to 15 percent
Calcium carbonate equivalent: 5 to 10 percent
Organic matter content: 2.0 to 4.0 percent
Bk horizon, upper part
Hue: 10YR, 7.5YR
Value: 4 to 7 dry; 4 to 6 moist
Chroma: 3 or 4 dry; 3 or 4 moist
Texture: extremely gravelly coarse sandy loam, extremely gravelly loamy coarse sand
Clay content: 8 to 18 percent
Gravel content: 60 to 80 percent
Calcium carbonate equivalent: 5 to 10 percent
Bk horizon, lower part
Hue: 10YR, 7.5YR
Value: 4 to 7 dry; 4 to 6 moist
Chroma: 3 or 4 dry; 3 or 4 moist
Texture: extremely gravelly loamy coarse sand, extremely gravelly coarse sand
Clay content: 2 to 10 percent
Gravel content: 60 to 75 percent
Cobble content: 0 to 5 percent
Calcium carbonate equivalent: 5 to 10 percent
COMPETING SERIES: This is the
Cablon series.
Cablon soils have greater than 10 percent carbonate content in the upper Bk horizons and have indurated carbonate concretions.
GEOGRAPHIC SETTING:
Parent material: alluvium
Landform: stream terraces
Slopes: 0 to 2 percent
Elevation: 2652 to 2804 meters (8,700 to 9,200 feet)
Mean annual temperature: 1.7 to 3.9 degrees C (35 to 39 degrees F)
Mean annual precipitation: 254 to 406 mm (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: This is the Platdon series. Platdon soils have endosaturation and are on flood-plain steps and flood plains.
DRAINAGE AND PERMEABILITY: somewhat excessively drained, moderately rapid permeability
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation Arizona fescue, western wheatgrass, prairie Junegrass, blue grama, and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Central Colorado; LRR E, MLRA 48B; small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Park County, Colorado, 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 200 cm.
Particle-size control section: The zone from 25 to 100 cm (Bk1, Bk2 horizons)
Mollic epipedon: The zone from 3 to 20 cm (A1, A2 horizons)
Calcic horizon: The zone from 20 to 155 cm (Bk1, Bk2 horizons)
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.