LOCATION TYMOSLING COEstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Aridic Haplustalfs
TYPICAL PEDON: Tymosling very gravelly clay loam-rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 1 inch; grayish brown (10YR 5/2) very gravelly clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; soft, very friable, sticky and slightly plastic; 40 percent gravel, 10 percent boulders; neutral (pH 7.2); abrupt smooth boundary. (1 to 5 inches thick)
AB--1 to 5 inches; grayish brown (10YR 5/2) gravelly clay loam, dark grayish brown (10YR 4/2) moist; moderate medium subangular blocky structure; slightly hard, friable, sticky and plastic; 15 percent gravel, 5 percent boulders; neutral (pH 7.2); clear wavy boundary. (0 to 5 inches thick)
Bt1--5 to 9 inches; grayish brown (10YR 5/2) clay, brown (10YR 4/3) moist; strong medium prismatic structure parting to strong medium angular blocky; very hard, firm, very sticky and plastic; common prominent clay films on faces of peds; 10 percent gravel, 5 percent boulders; mildly alkaline (pH 7.4); clear wavy boundary. (4 to 15 inches thick)
Bt2--9 to 14 inches; brown (10YR 5/3) clay, dark yellowish brown (10YR 4/4) moist; moderate medium prismatic structure parting to moderate medium angular blocky; very hard, firm, very sticky and plastic; common prominent thick clay films on faces of peds; strongly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (0 to 8 inches thick)
Bk1--14 to 22 inches; light gray (2.5Y 7/2) clay, light brownish gray (2.5Y 6/3) moist; moderate medium prismatic structure parting to moderate coarse angular blocky; very hard, firm, very sticky and plastic; common medium masses of calcium carbonate; strongly effervescent; moderately alkaline (pH 8.2); clear wavy boundary. (5 to 10 inches thick)
Bk2--22 to 35 inches; light gray (2.5Y 7/2) clay, pale yellow (2.5Y 7/3) moist; weak medium prismatic structure; very hard, firm, very sticky and plastic; common medium masses of calcium carbonate; strongly effervescent; moderately alkaline (pH 8.4); gradual wavy boundary. (6 to 15 inches thick)
Cr--35 inches; soft calcareous shale.
TYPE LOCATION: Moffat County, Colorado; about 5 miles northeast of Dinosaur; about 1,000 feet east and 2,400 feet north of the southwest corner of Sec. 24, T. 4 N., R. 103 W.; 40 degrees, 18 minutes, 6 seconds north latitude, 108 degrees, 54 minutes, 34 seconds west longitude.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 44 to 46 degrees F. and the mean summer soil temperature ranges from 61 to 63 degrees F. Depth to the paralithic contact ranges from 25 to 40 inches. Depth to which the soil is effervescent ranges from 9 to 20 inches. The control section averages 5 to 20 percent rock fragments.
The A horizon has a value of 4 or 5 dry, 3 moist, and a chroma of 2 or 3. Reaction is neutral or mildly alkaline.
The Bt1 horizon has a hue of 10YR or 7.5YR, value of 5 or 6 dry, 4 or 5 moist, and chroma of 2 through 4. Texture is clay loam or clay. Content of rock fragments ranges from 10 to 25 percent.
The Bt2 horizon has a hue of 10YR or 7.5YR, value of 5 or 6 dry, 4 or 5 moist, and chroma of 2 through 4. Texture is clay loam or clay. Content of rock fragments ranges from 0 to 15 percent. Reaction is mildly alkaline or moderately alkaline.
The Bk horizons have a hue of 10YR or 2.5Y, value of 6 or 7 dry, 5 through 7 moist and a chroma of 2 through 4. Texture is clay or silty clay.
COMPETING SERIES: These are the Boettcher (CO), Ferd (T)(MT), Kather (CO), Mulstay (CO), and Pinelli (WY) series. The Boettcher and Kather soils are in a cryic temperature regime. The Ferd, Mulstay, and Pinelli soils are deep.
GEOGRAPHIC SETTING: Tymosling soils are on rolling plateaus. These soils formed in colluvium and residuum derived from sedimentary rocks. Slopes range from 5 to 15 percent. Elevation ranges from 7,200 to 8,200 feet. The mean annual precipitation ranges from 14 to 16 inches, the mean annual temperature ranges from 42 to 45 degrees F., and the frost-free period is 75 to 95 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Emlin, Morapos, and Pagoda soils. The Emlin soil is deep and in a fine-loamy family. The Morapos and Pagoda soils are deep and have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Well drained, medium runoff; very slow permeability.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation consists of bluebunch wheatgrass, prairie junegrass, Indian ricegrass, needleandthread, and Sandberg bluegrass.
DISTRIBUTION AND EXTENT: These soils occur in northwestern Colorado. The series is of small extent. Total acreage is about 1,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Moffat County (Moffat County Area), Colorado, 1991.
REMARKS: Diagnostic horizons and features recognized in this pedon are: the ochric epipedon - the zone from 0 to 5 inches; the argillic horizon - the zone from 5 inches to 14 inches; the paralithic contact at 35 inches; Borollic feature - the organic carbon content and the soil temperature regime meets the requirements for Borollic. Proposed for the B part of map unit 125. Last updated by the state 12/90.