LOCATION CHUBBS COEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive Lithic Haplocryalfs
TYPICAL PEDON: Chubbs sandy loam, on a south facing, 9 percent slope in grassland at an elevation of 2734 meters (8970 feet). (Colors are for dry soil unless otherwise noted.) Described on September 26, 1984.
A--0 to 10 cm (0 to 4 inches); reddish brown (5YR 4/3) sandy loam, dark reddish brown (5YR 3/2) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; 10 percent gravel; slightly acid (6.1); clear smooth boundary. (10 to 15 cm thick)
Bt--10 to 30 cm (4 to 12 inches); reddish brown (2.5YR 4/4) gravelly sandy clay loam, dark reddish brown (2.5YR 3/4) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and, moderately sticky and moderately plastic; many distinct clay films on faces of peds; 20 percent gravel; neutral (6.8); clear smooth boundary. (15 to 30 cm thick)
R--30 to 152 cm (12 to 60 inches); sandstone.
TYPE LOCATION: Park County, Colorado; about 27 kilometers (17 miles) west of Guffey; located about 300 feet north and 500 feet east of the southwest corner of section 31, T. 15 S., R. 75 W. ; Gribbles Park USGS quad; lat. 38 degrees 41 minutes 43 seconds N. and long. 105 degrees 49 minutes 56 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 lithic contact: 25 to 51 cm to sandstone or shale (10 to 20 inches)
Depth to argillic horizon: 15 to 30 cm (6 to 12 inches)
Thickness of the ochric epipedon: 10 to 15 cm (4 to 6 inches)
Lithology of rock fragments: sandstone
Particle-size control section (weighted averages):
Clay content: 20 to 27 percent
Rock fragment content: 15 to 22 percent
A horizon
Hue: 7.5YR, 2.5YR, 5YR
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 2 or 3 dry; 2 or 3 moist
Clay content: 10 to 19 percent
Gravel content: 5 to 15 percent, indurated sandstone
Reaction: slightly acid or neutral (pH 6.1-7.3)
Organic matter content: 1.0 to 3.0 percent
Bt horizon
Hue: 7.5YR, 2.5YR, 5YR
Value: 4 or 5 dry; 3 to 5 moist
Chroma: 2 to 4 dry; 2 to 4 moist
Texture: gravelly sandy clay loam, gravelly loam
Clay content: 20 to 30 percent
Gravel content: 15 to 25 percent, indurated sandstone
Reaction: slightly acid or neutral (pH 6.1-7.3)
COMPETING SERIES: These are the Scotch and Silex series. Scotch and Silex soils have a udic moisture regime.
GEOGRAPHIC SETTING:
Parent material: alluvium derived from sandstone and shale, commonly of the Pennsylvanian age Belden and Minturn Formations.
Landform: on crests and side slopes of hills
Slopes: 5 to 20 percent
Elevation: 2621 to 2926 meters (8600 to 9600 feet)
Mean annual temperature: 1.7 to 3.9 degrees C (35 to 39 degrees F)
Mean annual precipitation: 254 to 356 mm (10 to 14 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 Glentivar series. The Glentivar soils are deep and are on side slopes of hills.
DRAINAGE AND PERMEABILITY: Well drained, moderate permeability
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation consists mainly of Arizona fescue, Indian ricegrass, blue grama, mountain muhly, needleandthread, and western wheatgrass.
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 Chubbs series name was reactivated in 2009 for use in the Teller-Park soil survey. This series was originally established in 1959 in Chaffee County, Colorado, in the Trout Creek Watershed Area, which is now a part of the soil survey of Pike and San Isabel National Forests, Northern Part. The name is from a gulch in Chaffee County.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from 0 to 30 cm.
Particle-size control section: The zone from 10 to 30 cm. (the argillic horizon)
Ochric epipedon: The zone from 0 to 10 cm. (A horizon)
Argillic horizon: The zone from 10 to 30 cm. (Bt horizon)
Lithic contact: The contact with sandstone at 30 cm. (R layer)
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.