LOCATION JOKODOWSKI COTentative Series
TAXONOMIC CLASS: Fine, smectitic Typic Humicryerts
TYPICAL PEDON: Jokodowski clay loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 3 inches; dark grayish brown (10YR 4/2) clay loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common fine roots; moderately acid; clear smooth boundary. (2 to 5 inches thick)
A2--3 to 8 inches; dark grayish brown (10YR 4/2) clay loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure parting to weak medium granular; slightly hard, very friable, slightly sticky and slightly plastic; common fine roots; moderately acid; clear smooth boundary. (3 to 8 inches thick)
Bt--8 to 23 inches; brown (10YR 5/3) clay, brown (10YR 4/3) moist; moderate medium subangular blocky structure; extremely hard, friable, moderately sticky and moderately plastic; many slickensides on faces of peds; thin continuous clay films on ped faces; common fine roots; strongly acid, gradual smooth boundary. (13 to 20 inches thick)
BC--23 to 43 inches; brown (10YR 5/3) clay; brown (10YR 4/3) moist; common medium yellowish brown (10YR 5/8) mottles; strong medium and coarse angular blocky structure; extremely hard, firm, moderately sticky and moderately plastic; many intersecting slickensides on faces of peds; few fine roots; strongly acid; gradual smooth boundary. (15 to 20 inches thick)
C--43 to 60 inches; yellowish brown (10YR 5/4) clay loam; dark yellowish brown (10YR 4/4) moist; common medium yellowish brown (10YR 5/8) mottles; massive; extremely hard, firm, moderately sticky and moderately plastic; many intersecting slickensides on faces of peds; few fine roots; strongly acid.
TYPE LOCATION: Routt County, Colorado; 22 miles northeast of Hayden; 400 feet east and 50 feet north of the southwest corner of Sec. 11, T. 9 N., R. 87 W.
RANGE IN CHARACTERISTICS: Mean annual soil temperature ranges from 36 to 38 degrees F., and mean summer soil temperature ranges from 55 to 57 degrees F. In most years there are cracks one centimeter wide at a depth of 20 inches that are open for 30 to 60 days. Surface horizons that have color value, dry, of less than 5.5 and a color value, moist, of less than 3.5 have a combined thickness of 5 to 11 inches. Depth to distinct mottling is 20 to 40 inches. The particle-size control section has 40 to 60 percent clay and less than 15 percent fine or coarser sand.
The A horizon has hue of 2.5Y or 10YR, value of 4 or 5 when dry, 3 or 4 when moist, and chroma of 2 or 3. Reaction is moderately acid to neutral.
The Bt horizon has hue of 2.5Y or 10YR, value of 4 through 6, and chroma of 3 or 4. It is clay or silty clay. Reaction is strongly acid to moderately acid.
The C horizon has hue of 2.5Y or 10YR, value of 4 through 6, and chroma of 2 through 4. It is clay or silty clay. Reaction is strongly acid to neutral.
COMPETING SERIES: This is the Etnass series. Etnass soils have horizons of carbonate accumulation.
GEOGRAPHIC SETTING: Jokodowski soils are on hillsides. Slopes range from 3 to 40 percent. The soil formed in alluvium and residuum derived from shale. Elevation ranges from 7,800 to 8,400 feet. The mean annual precipitation ranges from 25 to 30 inches. Mean annual air temperature ranges from 35 to 37 degrees F. The frost-free period is about 30 to 60 days. More than one-half of the precipitation falls as snow in the winter.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the Burnette soil which has a mollic epipedon and does not crack to the surface.
DRAINAGE AND PERMEABILITY: Moderately well drained; runoff is medium on gentle slopes and rapid on steep slopes; very slow permeability.
USE AND VEGETATION: These soils are used for livestock grazing in the summer. Native vegetation consists of big sagebrush, needlegrasses, brome, fescues, and wheatgrasses.
DISTRIBUTION AND EXTENT: Northwestern Colorado. MLRA 48A. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Routt County (Routt National Forest Area), Colorado, 1982.
REMARKS:
The 7/2006 revision changes the classification from Typic Hapluderts to Typic Humicryerts.