LOCATION HOODLING COEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Calcic Argicryolls
TYPICAL PEDON: Hoodling gravelly loam, 12 percent slope in grassland at an elevation of 9850 feet. (Colors are for dry soil unless otherwise noted.) Described on July 15, 1981.
A--0 to 5 inches; dark grayish brown (10YR 4/2) gravelly loam, very dark brown (10YR 2/2) moist; weak thick platy structure parting to weak fine granular; soft, very friable, slightly sticky, nonplastic; 10 percent gravel, 5 percent cobbles; neutral (pH 7.0); abrupt smooth boundary. (4 to 7 inches thick)
Bt1--5 to 8 inches; brown (10YR 4/3) very gravelly clay loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; hard, friable, sticky, moderately plastic; few distinct clay films on faces of peds; 40 percent gravel, 5 percent cobbles; neutral (pH 7.2); abrupt smooth boundary. (3 to 7 inches thick)
Bt2--8 to 17 inches; brown (7.5YR 5/4) very gravelly clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; very hard, firm, very sticky, moderately plastic; common distinct clay films on faces of peds; 40 percent gravel, 5 percent cobbles; neutral (pH 7.3); abrupt smooth boundary. (8 to 12 inches thick)
Btk--17 to 24 inches; light yellowish brown (10YR 6/4) very gravelly clay loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; hard, friable, sticky, slightly plastic; common distinct clay films on faces of peds; common medium calcium carbonate masses in the matrix; 40 percent gravel, 5 percent cobbles; strongly effervescent; 24 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); clear wavy boundary. (thickness of the Btk and/or upper Bk horizons: 6 to 10 inches)
Bk1--24 to 35 inches; very pale brown (10YR 8/2) very gravelly loam, pale brown (10YR 6/3) moist; weak fine subangular blocky structure; hard, friable, moderately sticky, slightly plastic; common medium calcium carbonate masses in the matrix; 35 percent gravel, 5 percent cobbles; violently effervescent; 6 percent calcium carbonate equivalent; moderately alkaline (pH 8.4); clear wavy boundary.
Bk2--35 to 60 inches; very pale brown (10YR 8/2) very gravelly sandy loam, pale brown (10YR 6/3) moist; massive; slightly hard, friable, slightly sticky, nonplastic; common medium calcium carbonate masses in the matrix; 50 percent gravel, 5 percent cobbles; violently effervescent; 6 percent calcium carbonate equivalent; moderately alkaline (pH 8.4). (combined thickness of the lower Bk horizons: 26 to 38 inches)
TYPE LOCATION: Park County, Colorado; about 13 miles west of Guffey, about 1100 feet east and 1600 feet south of the northwest corner of sec. 22, T. 15 S., R. 75 W.; Gribbles Park USGS quad; lat. 38 degrees 44 minutes 01 seconds N. and long. 105 degrees 46 minutes 27 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is usually dry in some part in early summer, moist in some or all parts in late July and August, and intermittently dry in fall; ustic regime, typic subclass.
Mean annual soil temperature: 37 to 41 degrees F.
Mean summer soil temperature: 51 to 58 degrees F.
Thickness of mollic epipedon: 7 to 12 inches
Depth to argillic horizon: 5 to 9 inches
Depth to calcic horizon: 10 to 20 inches
Particle-size control section (weighted average):
Noncarbonate clay content: 27 to 35 percent
Rock fragments: 35 to 60 percent
A horizon:
Hue: 10YR or 7.5YR
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3 dry; 1 through 3 moist
Texture: very cobbly loam, gravelly loam
Clay content: 15 to 27 percent
Fragment content: 15 to 60 percent rock fragments
Fragment size and content: 10 to 20 percent indurated gravel, 5 to 40 percent indurated cobbles
Organic matter content: 2.0 to 4.0 percent
Bt horizon, upper part
Hue: 10YR or 7.5YR
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3 dry; 1 through 3 moist
Texture: very cobbly loam, very gravelly sandy clay loam, very gravelly clay loam
Clay content: 22 to 35 percent
Fragment content: 35 to 60 percent rock fragments
Fragment size and content: 15 to 55 percent indurated gravel, 0 to 30 percent indurated cobbles, 0 to 10 percent indurated stones
Bt horizon, lower part
Hue: 10YR or 7.5YR
Value: 4 or 5 dry
Chroma: 3 or 4 dry; 3 or 4 moist
Texture: very cobbly clay loam, very gravelly clay loam, very gravelly sandy clay loam
Clay content: 27 to 35 percent
Fragment content: 35 to 60 percent rock fragments
Fragment size and content: 15 to 55 percent indurated gravel, 0 to 30 percent indurated cobbles, 0 to 10 percent indurated stones
Reaction: neutral or slightly alkaline (pH 6.6 to 7.8)
Btk horizon (the upper Bk horizons in some pedons)
Hue: 10YR or 7.5YR
Value: 4 to 6 dry; 4 or 5 moist
Chroma: 3 or 4 dry; 3 or 4 moist
Texture: very cobbly sandy clay loam, very gravelly clay loam, very gravelly sandy clay loam
Clay content: 20 to 35 percent
Carbonate clay content: 1 to 5 percent
Fragment content: 35 to 60 percent rock fragments
Fragment size and content: 15 to 55 percent indurated gravel, 0 to 30 percent indurated cobbles, 0 to 10 percent indurated stones
Calcium carbonate equivalent: 15 to 25 percent
Reaction: slightly alkaline or moderately alkaline (pH 7.4 to 8.4)
Bk horizon (the lower Bk horizons in some pedons)
Hue: 10YR or 7.5YR
Value: 4 through 8 dry; 4 through 7 moist
Chroma: 2 through 4 dry; 2 through 4 moist
Texture: very cobbly sandy loam, very gravelly sandy loam, very gravelly loam
Clay content: 12 to 27 percent
Carbonate clay content: 1 to 3 percent
Fragment content: 35 to 60 percent rock fragments
Fragment size and content: 15 to 55 percent indurated gravel, 0 to 30 percent indurated cobbles, 0 to 10 percent indurated stones
Calcium carbonate equivalent: 5 to 10 percent
Reaction: slightly alkaline or moderately alkaline (pH 7.4 to 8.4)
COMPETING SERIES: These are the
Cavemountain,
Hodden,
Latigo,
Maciver,
Nurkey,
Teeler series.
Cavemountain soils have a lithic contact between 20 and 40 inches.
Hodden soils have a ustic bordering on aridic soil moisture regime.
Latigo and Nurkey soils have a xeric soil moisture regime.
Maciver and Teeler soils have a moisture control section that is moist in spring and summer, and intermittently dry in July and August.
GEOGRAPHIC SETTING:
Parent material: slope alluvium and/or outwash
Landform: outwash terraces or scarps on dissected pediments
Slopes: 5 to 40 percent
Elevation: 7,500 to 10,900 feet
Mean annual air temperature: 37 to 40 degrees F.
Mean annual precipitation: 14 to 17 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 Fulvance series. The Fulvance soils do not have a mollic epipedon.
DRAINAGE AND PERMEABILITY: well drained, moderately slow permeability.
USE AND VEGETATION: These soils are used mainly for livestock grazing. Potential native vegetation is mainly Arizona fescue, mountain muhly, Parry's oatgrass, prairie junegrass, blue grama, western wheatgrass, and slimstem muhly.
DISTRIBUTION AND EXTENT: Central Colorado; LRR E, MLRA 48A; moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Park County, Colorado, Teller-Park soil survey area, 2010. The name is coined.
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 5 to 24 inches. (Bt1, Bt2, Btk horizons)
Mollic epipedon: The zone from 0 to 8 inches. (A, Bt1 horizons)
Argillic horizon: The zone from 5 to 24 inches. (Bt1, Bt2, Btk horizons)Secondary calcium carbonate: The zone from 17 to 60 inches. (Bk1, Bk2, Bk3 horizons)
Calcic horizon: The zone from 17 to 24 inches. (Btk horizon)
3/2005: Classification was revised from Ustic to Calcic Argicryolls due to the presence of a calcic horizon.
Taxonomic Version: Eleventh edition Keys to Soil Taxonomy, 2010