LOCATION JOEBAS CO+UT WYEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, frigid Lithic Haplustalfs
TYPICAL PEDON: Joebas gravelly sandy loam, rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 3 inches; brown (7.5YR 4/4) gravelly sandy loam, dark brown (7.5YR 3/2) moist; weak medium granular structure; soft, very friable, slightly sticky and slightly plastic; 15 percent pebbles; neutral (pH 7.0); abrupt wavy boundary. (2 to 4 inches thick)
BA--3 to 7 inches; yellowish red (5YR 5/6) gravelly sandy loam, dark reddish brown (5YR 3/4) moist; weak medium subangular blocky structure parting to weak fine subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; 15 percent pebbles; neutral (pH 6.8); clear smooth boundary. (3 to 5 inches thick)
Bt--7 to 13 inches; yellowish red (5YR 5/6) gravelly sandy clay loam, reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure parting to moderate fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; 15 percent pebbles; neutral (pH 6.8); clear smooth boundary. (3 to 7 inches thick)
BC--13 to 16 inches; yellowish red (5YR 5/6) gravelly sandy clay loam, reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure parting to weak fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; 20 percent pebbles; neutral (pH 6.6); abrupt wavy boundary. (2 to 4 inches thick)
R--16 inches; hard reddish quartzite bedrock.
TYPE LOCATION: Moffat County, Colorado; approximately 46 miles northwest of Maybell, about 2,400 feet west and 1,700 feet north of the southeast corner of Sec. 2, T. 10 N., R. 102 W. (Latitude: 40 degrees, 51 minutes, 8 seconds; longitude: 108 degrees, 49 minutes, 43 minutes)
RANGE IN CHARACTERISTICS: Mean annual soil temperature ranges from 45 to 46 degrees F., and mean summer soil temperature ranges from 65 to 70 degrees F. The lithic contact is at a depth of 10 to 20 inches.
The A horizon has hue of 7.5YR or 5YR, value of 4 through 6 dry, 3 or 4 moist, and chroma of 2 through 4. Reaction is neutral or mildly alkaline.
The Bt horizon has hue of 5YR or 2.5YR, value of 5 or 6 dry, 4 or 5 moist, and chroma of 3 through 6. It is gravelly sandy clay loam or sandy clay loam. Content of rock fragments ranges from 5 to 35 percent. Reaction is neutral or mildly alkaline.
The BC, C, or Bk in some pedons, has hue of 5YR or 2.5YR, value of 5 or 6 dry, 4 or 5 moist, and chroma of 3 through 6. It is gravelly sandy clay loam, cobbly sandy loam, gravelly sandy loam, sandy clay loam, or sandy loam. Content of rock fragments ranges from 5 to 35 percent. Reaction is neutral to moderately alkaline.
COMPETING SERIES: These are the Chalkhill (WY) and the Chalkville (WY) series. These soils have hue of 7.5YR and yellower in the Bt horizon.
GEOGRAPHIC SETTING: Joebas soils are on mountainsides and plateaus. Slopes range from 3 to 25 percent. The soil formed in residuum derived from sandstone and quartzite. Elevation ranges from 6,000 to 8,000 feet. The mean annual precipitation ranges from 11 to 16 inches. Mean annual temperature ranges from 42 to 45 degrees F. The frost-free period is about 75 to 95 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fonce, Forelle, and Rock River soils. All of these soils lack bedrock above 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used for limited livestock grazing and wildlife habitat. Native vegetation consists of pinyon pine, Utah juniper, needleandthread, Indian ricegrass, bluebunch wheatgrass, antelope bitterbrush, and Wyoming big sagebrush.
DISTRIBUTION AND EXTENT: Joebas soils occur in northwestern Colorado. The series is of small extent with a total area of about 6,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Henry's Fork Soil Survey Area in Utah and Wyoming, 1990.
REMARKS: Diagnostic horizon recognized in this pedon is the argillic horizon - the zone from 7 to 16 inches. Last updated by the state 12/90.