LOCATION FLYNNCOVE UTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, siliceous, superactive, frigid Typic Argiustolls
TYPICAL PEDON: Flynncove cobbly loam, on a north facing, convex, 5 percent slope at an elevation of 7,400 feet. (Colors are for dry soil unless otherwise noted.)
The surface is covered by 5 percent cobbles and 5 percent gravel.
A1--0 to 3 inches; dark brown (7.5YR 4/2) cobbly loam, very dark brown (7.5YR 2/2) moist; moderate very fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and common fine, medium and coarse roots; common very fine, fine and few medium and coarse tubular pores; 10 percent cobbles and 5 percent gravel; neutral (pH 7.0); abrupt smooth boundary. (3 to 9 inches thick)
A2--3 to 8 inches; brown (7.5YR 4/2) cobbly loam; dark brown (7.5YR 3/2) moist; moderate coarse subangular blocky structure parting to moderate very fine and fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; many very fine, common fine, and few medium and coarse roots; common very fine and fine, few medium tubular pores; 10 percent cobbles and 10 percent gravel; neutral (pH 7.0); clear smooth boundary. (0 to 9 inches thick).
Bt1--8 to 15 inches; reddish brown (5YR 4/3) cobbly sandy clay loam, dark reddish brown (5YR 3/3) moist; weak coarse prismatic structure parting to moderate very fine and fine subangular blocky; very hard, firm, moderately sticky and moderately plastic; common very fine and fine and few medium and coarse roots; common very fine and fine and few medium tubular pores; common distinct clay films on faces of peds and pores; 5 percent stones, 10 percent cobbles and 15 percent gravel; neutral (pH 7.0); clear wavy boundary. (3 to 27 inches thick)
Bt2--15 to 24 inches; reddish brown (2.5YR 4/4) extremely cobbly sandy clay loam, dark reddish brown (2.5YR 3/4) moist; moderate medium subangular blocky structure parting to moderate very fine and fine subangular blocky; very hard, firm, moderately sticky and moderately plastic; common very fine and fine and few medium and coarse roots; common very fine and fine and few medium tubular pores; common distinct clay films on faces of peds and pores; 10 percent stones, 20 percent cobbles and 35 percent gravel; neutral (pH 7.0); gradual wavy boundary. (7 to 22 inches thick)
Bt3--24 to 37 inches; reddish brown (2.5YR 4/4) extremely cobbly sandy clay loam, dark red (2.5YR 3/6) moist; moderate medium and coarse subangular blocky structure parting to moderate very fine, fine and medium subangular blocky; hard, firm, moderately sticky and moderately plastic; few very fine, fine, medium, and coarse roots; common very fine and fine and few medium tubular pores; common distinct clay films on ped faces and in pores; 10 percent stones, 30 percent cobbles and 30 percent gravel; neutral (pH 7.0) gradual irregular boundary. (0 to 24 inches thick)
C--37 to 60 inches; reddish brown (2.5YR 5/4) extremely cobbly sandy loam, reddish brown (2.5YR 4/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine, fine, medium and coarse roots; few medium tubular and common very fine and fine interstitial pores; 10 percent stones, 30 percent cobbles and 25 percent gravel; slightly alkaline (pH 7.4).
TYPE LOCATION: Uintah County, Utah; about 30 miles northeast of Vernal; located about 2,700 feet south and 1,400 feet east of the northwest corner of sec. 36, T. 1 S., R. 24 E., SLBM; Crouse Reservoir, Utah USGS quad; lat. 40 degrees 41 minutes 29 seconds N. and long. 109 degrees 10 minutes 25 seconds W., NAD 27
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is affected by precipitation that falls evenly through the year with a slight increase in late summer and early fall. Typic ustic moisture regime.
Mean annual soil temperature: 42 to 46 degrees F.
Thickness of the argillic horizon: 15 to 47 inches
Thickness of the mollic epipedon: 13 to 15 inches
Particle-size control section (weighted average): 27 to 35 percent clay and 50 to 80 percent rock fragments.
A horizon:
Hue: 2.5YR to 7.5YR
Value: 4 or 5 dry
Chroma: 2 to 4 dry or moist
Texture: cobbly loam or extremely stony loam
Reaction: neutral or slightly alkaline
Bt horizon:
Hue: 10R to 5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 3 to 6 dry or moist
Texture: cobbly sandy clay loam, very cobbly sandy clay loam, extremely cobbly sandy clay loam, and extremely stony sandy clay loam
Reaction: neutral or slightly alkaline
C horizon:
Hue: 2.5YR or 5YR
Value: 4 or 5 dry
Chroma: 3 or 4 dry or moist
Reaction: slightly alkaline or moderately alkaline
COMPETING SERIES: These are no competing series in this family.
GEOGRAPHIC SETTING:
Parent material: slope alluvium and colluvium derived from sandstone and quartzite rocksLandform: fan remnants and mountain slopes
Slopes: 4 to 50 percent
Elevation: 6,800 to 9,000 feet
Mean annual air temperature: 40 to 43 degrees F.
Mean annual precipitation: 16 to 22 inches
Frost-free period: 70 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abracon, Clapper, Namon, Diagulch, Grapit, Lap, Morval, and Tridell series.
Abracon soils have an ochric epipedon.
Morval soils have a fine-loamy particle-size control section.
Diagulch soils do not have an argillic horizon.
Clapper soils occur on shoulders and have an ochric epipedon.
Namon soils occur on backslopes and have an ochric epipedon.
Grapit and Lap soils occur on mountain slopes and have carbonatic mineralogy.
Tridell soils occur on steep escarpments and do not have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained, slow to medium runoff, moderate permeability.
USE AND VEGETATION: The major uses are rangeland, wildlife habitat, and recreation. Potential native vegetation is bluebunch wheatgrass, needleandthread, antelope bitterbrush, mountain big sagebrush, birchleaf mountainmahogany and Utah serviceberry. These soils have been correlated to Mountain Stony Loam (Bitterbrush) - 047CY456UT, and Mountain Stony Loam (Browse) - 047CY460UT range sites in Utah.
DISTRIBUTION AND EXTENT: Northeastern Utah. LRR E, MLRA 47. This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Uintah County, Uintah Area Soil Survey, Utah. 1998. The name is taken from a geographic location in the area.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 8 to 28 inches. (Bt1, Bt2, and Bt3 horizons)
Mollic epipedon: The zone from 0 to 15 inches. (A1, A2, Bt1 horizons)
Argillic horizon: The zone from 8 to 37 inches. (Bt1, Bt2, Bt3 horizons)
Laboratory samples from similar geologic parent material and landscapes resulted in siliceous mineralogy.
The cation exchange activity class was inferred from laboratory data from similar soils in the Uintah Area Soil Survey.
Classification changed from Typic Argiborolls to superactive, frigid Typic Argiustolls 12/98.
Taxonomic Version: Eighth Edition, 1998.