LOCATION HANGDO UT
Established Series
REV: DAL/RLM
01/2015
HANGDO SERIES
The Hangdo series consists of very deep, well drained, moderately slowly permeable soils that formed in eolian sediments overlying and mixed with alluvium. These soils are on glacial outwash fans with slopes of 3 to 25 percent. Average annual precipitation is about 17 inches and mean annual temperature is about 43 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Argiustolls
TYPICAL PEDON: Hangdo loam, rangeland. (Colors are for air-dry soil unless otherwise noted.)
A--0 to 11 inches; dark reddish brown (5YR 3/2) loam, very dark gray (5YR 3/1) moist; weak coarse subangular blocky structure parting to moderate medium subangular blocky; soft, very friable, slightly sticky; many very fine and fine and few medium roots; many fine pores; 5 percent pebbles; slightly alkaline (pH 7.6); clear smooth boundary. (9 to 16 inches thick)
Bt1--11 to 20 inches; reddish brown (5YR 5/4) loam, dark reddish brown (5YR 3/4) moist; weak medium prismatic structure parting to moderate medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common fine, many medium and few coarse roots; many fine and common medium pores; few thin clay films on faces of peds; 5 percent pebbles, 1 percent cobbles; slightly alkaline (pH 7.8); gradual wavy boundary.
Bt2--20 to 35 inches; reddish brown (5YR 5/4) sandy clay loam, reddish brown (5YR 4/4) moist; moderate medium prismatic structure parting to strong medium subangular blocky; hard, firm, slightly sticky and plastic; common fine, medium and coarse roots; many fine, common medium pores; few thin clay films on faces of peds; 5 percent pebbles, 5 percent cobbles and 1 percent stones; slightly alkaline (pH 7.8); gradual wavy boundary. (combined Bt1 and Bt2 horizons 14 to 24 inches thick)
2Btb--35 to 44 inches; reddish brown (5YR 5/4) cobbly sandy clay loam, reddish brown (5YR 5/4) moist; moderate medium subangular blocky structure; hard, firm, sticky and plastic; few fine and medium roots; many fine and medium, few coarse pores; few moderately thick clay films on faces of peds; 10 percent pebbles, 10 percent cobbles and 3 percent stones; slightly alkaline (pH 7.8); gradual wavy boundary. (9 to 23 inches thick)
2BCb--44 to 63 inches; light reddish brown (5YR 6/4) cobbly sandy clay loam, reddish brown (5YR 5/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; many medium and common coarse pores; some colloid in bridges between mineral grains; 10 percent pebbles, 10 percent cobbles and 1 percent stones; rock fragments are highly weathered; moderately alkaline (pH 8.0).
TYPE LOCATION: San Juan County, Utah; about 3 miles north of LaSal, 400 feet north and 2,300 feet west of the SE corner of sec. 15, T. 28 S., R. 24 E.
RANGE IN CHARACTERISTICS: Thickness of the mollic epipedon is 10 to 16 inches. Depth to the top of the argillic horizon is 11 to 15 inches. Depth to visible carbonates is greater than 40 inches. The particle-size control section is 20 to 35 percent clay and averages 5 to 15 percent rock fragments. Rock fragments commonly increase in the lower part of the argillic horizon. Mean annual soil temperature is 45 to 47 degrees F.
The A horizon has hue of 5YR or 7.5YR, value of 3 or 4 dry and 2 or 3 moist and chroma of 2 or 3 dry and 1 or 2 moist. Rock fragments range from 0 to 15 percent pebbles and 0 to 15 percent cobbles. It is neutral or slightly alkaline.
The Bt horizon has hue of 5YR or 7.5YR, value of 4 or 5 dry and 3 or 4 moist and chroma of 3 through 6. It commonly is loam, clay loam, sandy clay loam or cobbly loam with 20 to 35 percent clay in the upper part and cobbly sandy clay loam, very cobbly or very gravelly clay loam with 30 to 40 percent clay in the lower part. Rock fragments in the lower part of the argillic horizon range from 10 to 40 percent pebbles, 10 to 25 percent cobbles and 0 to 10 percent stones. It is slightly alkaline or moderately alkaline.
The BC horizon has hue of 5YR or 7.5YR, value of 5 through 7 dry and 4 through 6 moist, chroma of 4 through 6 dry and 3 or 4 moist. It is cobbly sandy clay loam, very gravelly loam or very cobbly loam with 20 to 30 percent clay. It is slightly alkaline or moderately alkaline.
COMPETING SERIES: These are the Daniels,
Dooley,
Empedrado,
Fairfield,
Farnuf,
Felor,
Lefor,
Lininger(T),
Livona,
Martinsdale,
Moen,
Reeder,
Trag,
Tschicoma(T),
Vida,
Watrous,
Wemple,
Williams and
Yegen series. Daniels, Dooley, Empedrado, Fairfield, Farnuf, Felor, Lefor, Livona, Martinsdale, Reeder, Vida, Wemple, Williams and Yegen soils have accumulations of secondary carbonate above a depth of 40 inches. Moen and Watrous soils have bedrock at depths of 20 to 40 inches. Lininger soils have a paralithic contact at depth of 20 to 40 inches. Trag soils are neutral or slightly acid throughout and have hue of 7.5YR or 10YR. Trag soils also contain less than 15 percent rock fragments in the lower subsoil. Tschicoma soils have slightly acid to neutral Bt horizons and formed in volcanic rock.
GEOGRAPHIC SETTING: Hangdo soils are on glacial outwash fans at elevations of 7,200 to 8,300 feet. Slopes are 3 to 25 percent. The soils formed in eolian material overlying and mixed with alluvium derived from sandstone, shale and diorite. The mean annual temperature is 42 to 43 degrees F. and the average annual precipitation is 16 to 18 inches. The freeze-free period is 80 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Harol,
Kunz,
Moreno,
Mirand and
Waas soils. Kunz and Mirand soils do not have mollic epipedons. Harol soils have loamy-skeletal particle-size control section. Moreno soils have a fine particle-size control section. Waas soils have a fine-silty particle-size control section.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderately slow permeability.
USE AND VEGETATION: Used mainly for rangeland, wildlife habitat and recreation. Potential vegetation is Gambel oak, mountain big sagebrush, snowberry, bluegrass, and wheatgrass.
DISTRIBUTION AND EXTENT: Southeastern Utah. The soils in this series are not extensive; their total acreage is about 5,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Canyonlands Area, San Juan County, Utah, 1980. Named after Hangdog Creek.
REMARKS: The Hangdo series overlaps the Trag series in hues and reactions, but are different soils genetically by having sandstone parent rocks.
National Cooperative Soil Survey
U.S.A.