LOCATION PANNFIELD COEstablished Series
TAXONOMIC CLASS: Ashy, glassy Vitrandic Haplocryolls
TYPICAL PEDON: Pannfield ashy sandy loam, on a 4 percent slope in grassland at an elevation of 2835 meters (9,300 feet). (Colors are for dry soil unless otherwise noted.) Described on November 16, 1993.
A1--0 to 10 cm (0 to 4 inches); brown (10YR 4/3) ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; 5 percent gravel; neutral (pH 6.8); abrupt smooth boundary.
A2--10 to 20 cm (4 to 8 inches); dark grayish brown (10YR 4/2) ashy sandy loam, very dark gray (10YR 3/1) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; 10 percent gravel; neutral (pH 7.0); clear smooth boundary. (combined thickness of the A horizons: 18 to 25 cm)
Bk1--20 to 38 cm (8 to 15 inches); light brownish gray (2.5Y 6/2) very paragravelly ashy sandy clay loam, light yellowish brown (2.5Y 6/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common medium carbonate masses in the matrix; 3 percent gravel; 55 percent moderately cemented tuff paragravel; slightly effervescent; 2 percent calcium carbonate equivalent; slightly alkaline (pH 7.8); abrupt smooth boundary.
Bk2--38 to 56 cm (15 to 22 inches); pale yellow (5Y 8/2) very paragravelly ashy sandy clay loam, pale olive (5Y 6/4) moist; massive; soft, very friable, nonsticky and nonplastic; common medium carbonate masses on bottom of rock fragments and in the matrix; 2 percent gravel; 55 percent moderately cemented tuff paragravel; strongly effervescent; 2 percent calcium carbonate equivalent; moderately alkaline (pH 8.4); abrupt smooth boundary.
Bk3--56 to 89 cm (22 to 35 inches); pale yellow (5Y 8/2) very paragravelly ashy sandy clay loam, pale olive (5Y 6/4) moist; massive; soft, very friable, nonsticky and nonplastic; common medium carbonate masses in the matrix; 2 percent gravel; 55 percent moderately cemented tuff paragravel; slightly effervescent; 2 percent calcium carbonate equivalent; moderately alkaline (pH 8.4); abrupt smooth boundary. (combined thickness of the Bk horizons: 51 to 84 cm)
Cr--89 to 152 cm (35 to 60 inches); pale yellow (5Y 8/2) moderately cemented tuff.
TYPE LOCATION: Park County, Colorado; about 21 kilometers (13 miles) south of Hartsel; located about 2,100 feet north and 1,000 feet east of the southwest corner of Sec. 9, T. 14 S., R. 75 W.; Agate Mountain USGS quad; lat. 38 degrees 50 minutes 41 seconds N. and long. 105 degrees 47 minutes 36 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 paralithic contact with tuff: 76 to 102 cm (30 to 40 inches)
Depth to secondary calcium carbonate: 18 to 74 cm (7 to 29 inches)
Thickness of the mollic epipedon: 18 to 25 cm (7 to 10 inches)
Thickness of the volcanic glass layers: 51 to 102 cm (20 to 40 inches)
Lithology of rock fragments: mixed volcanics
Particle-size control section (in the thickest part):
Coarse silt plus sand content: 60 to 80 percent
Rock fragment content: 0 to 2 percent
Glass content: 40 to 74 percent
A horizons
Hue: 10YR, 7.5YR
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 2 or 3 dry; 1 to 3 moist
Clay content: 10 to 18 percent
Volcanic glass content: 25 to 40 percent
Acid oxalate extractable Al + 1/2 Fe: .10 to .25 percent
Gravel content: 0 to 10 percent, indurated
Organic matter content: 2.0 to 4.0 percent
Bk horizons
Hue: 2.5Y, 5Y
Value: 4 to 8 dry; 4 to 6 moist
Chroma: 2 to 4 dry; 2 to 4 moist
Clay content: 20 to 30 percent
Volcanic glass content: 40 to 75 percent
Acid oxalate extractable Al + 1/2 Fe: 0.0 to .05 percent
Gravel content: 0 to 5 percent, indurated
Paragravel content: 35 to 55, moderately cemented tuff
Calcium carbonate equivalent:<p> 2 to 5 percent
Reaction: slightly alkaline or moderately alkaline (pH 7.4 to 8.4)
COMPETING SERIES: These are the
Anniecreek,
Bigbutte,
Bodiecreek,
Brownsbowl,
Cadero,
Hallet, and
Medrick series.
The Anniecreek, Bodiecreek, Brownsbowl, Hallet, and Medrick soils are very deep.
The Bigbutte and Cadero soils have a xeric soil moisture regime.
GEOGRAPHIC SETTING:
Parent material: slope alluvium derived from tuff
Landform: scarps on dissected pediments
Slopes: 2 to 15 percent
Elevation: 2743 to 2926 meters (9,000 to 9,600 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 Medrick series. The Medrick soils are very deep and are on pediments.
DRAINAGE AND PERMEABILITY: well drained, moderately rapid permeability.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation consists mainly of Arizona fescue, western wheatgrass, prairie Junegrass, and blue grama.
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 114 cm.
Control section for the particle-size class substitute: The zone from 25 to 89 cm. (Bk1, Bk2, Bk3 horizons)
Mollic epipedon: The zone from 0 to 20 cm. (A1, A2 horizons)
Secondary carbonates: The zone from 20 to 89 cm. (Bk1, Bk2, Bk3 horizons)
Vitrandic feature: Throughout the upper 75cm layer (A1, A2, Bk1, Bk2, Bk3 horizons)
Paralithic contact: The contact with tuff at 89 cm. (Cr layer)
Taxonomic Version: Classified according to Keys to Soil Taxonomy, 11th Edition, 2010.