LOCATION TRIDELL UT WYEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Aridic Calciustolls
TYPICAL PEDON: Tridell very cobbly loam, on a northwest facing, concave, 30 percent slope in twoneedle pinyon, Utah juniper, black sagebrush and birchleaf mountainmahogany at an elevation of 7,500 feet. (Colors are for dry soil unless otherwise noted.)
The surface is covered by 50 percent cobbles and gravel.
A--0 to 4 inches; brown (10YR 5/3) very cobbly loam, dark brown (7.5YR 3/2) moist; moderate fine and very fine granular structure; soft, friable, slightly sticky and slightly plastic; few coarse, medium and fine, many very fine roots; few medium, common fine, and many very fine tubular pores; 5 percent cobbles and 20 percent gravel; very slightly effervescent, (8 percent calcium carbonate equivalent), carbonates are disseminated; moderately alkaline (pH 8.0); abrupt smooth boundary. (4 to 11 inches thick)
Bw--4 to 10 inches; brown (10YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure parting to moderate fine and very fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; few medium and coarse and common fine and very fine roots; few medium, common fine and very fine random tubular pores; 5 percent cobbles and 25 percent gravel; slightly effervescent, (15 percent calcium carbonate equivalent), carbonates are disseminated; moderately alkaline (pH 8.0); abrupt smooth boundary. (0 to 12 inches thick)
Bk1--10 to 15 inches; pale brown (10YR 6/3) very gravelly loam, brown (10YR 4/3) moist; moderate fine and very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few medium and coarse and common fine and very fine roots; few medium, common fine and very fine tubular pores; 5 percent cobbles and 35 percent gravel; strongly effervescent, (28 percent calcium carbonate equivalent), carbonates are disseminated and segregated as less than 1 mm thick coatings on underside of rock fragments; moderately alkaline (pH 8.2); clear smooth boundary. (5 to 16 inches thick)
Bk2--15 to 29 inches; very pale brown (10YR 7/3) very gravelly loam, yellowish brown (10YR 5/4) moist; moderate medium and fine subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; few fine and very fine roots; few medium common fine and very fine tubular pores; 5 percent cobbles and 35 percent gravel; strongly effervescent, (29 percent calcium carbonate equivalent), carbonates are disseminated and segregated as less than 1 mm thick coatings around rock fragments and as common irregular medium masses; moderately alkaline (pH 8.2);clear wavy boundary. (7 to 32 inches thick)
Bk3--29 to 49 inches; very pale brown (10YR 8/3) very gravelly loam, light yellowish brown (10YR 6/4) moist; moderate medium and fine subangular blocky structure; hard, friable, moderately sticky and slightly plastic; few fine and very fine roots; few medium, common fine and many very fine tubular pores; 5 percent cobbles and 30 percent gravel; strongly effervescent, (31 percent calcium carbonate equivalent), carbonates are disseminated and segregated as less than 1 mm thick coatings on rock fragments and few cylindrical fine masses; strongly alkaline (pH 8.6); gradual wavy boundary. (0 to 20 inches thick)
Bk4--49 to 60 inches; very pale brown (10YR 8/3) very gravelly loam, pale brown (10YR 6/3) moist; massive; hard, friable, moderately sticky and slightly plastic; few medium, common fine, and many very fine tubular pores; 35 percent gravel; strongly effervescent, (35 percent calcium carbonate equivalent), carbonates are disseminated and segregated as less than 1 mm thick coatings on rock fragments and few fine irregular fine masses; strongly alkaline (pH 8.6).
TYPE LOCATION: Uintah County, Utah; about 6 miles north of Red Fleet Reservoir; located about 1,800 feet south and 1,800 feet west of the northeast corner of sec. MS 6907, T. 2 S., R. 22 E., SLBM; Burnt Cabin Gorge, Utah USGS quad; lat. 40 degrees 39 minutes 30 seconds N. and long. 109 degrees 23 minutes 35 seconds W., NAD 27
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is affected by precipitation that falls evenly throughout the year with a slight increase in the late summer and fall; ustic moisture regime bordering on aridic.
Mean annual air temperature: 42 to 45 degrees F
Mean annual soil temperature: 44 to 47 degrees F
Depth to secondary calcium carbonate: 7 to 21 inches
Depth to calcic horizon: 7 to 21 inches
Particle-size control section (weighted average):
Clay content: 18 to 27 percent
Rock fragments: 35 to 70 percent
A horizon:
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 3 or 4 dry, 2 or 3 moist
Texture: very cobbly loam, cobbly loam, or extremely cobbly loam
Calcium carbonate equivalent: 1 to 10 percent
Reaction: slightly alkaline or moderately alkaline
Bw horizon:
Hue: 5YR to 10YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 3 or 4
Texture: gravelly loam, very gravelly loam, very cobbly loam
Calcium carbonate equivalent: 5 to 15 percent
Bk horizon:
Hue: 5YR to 10YR
Value: 5 to 8 dry, 4 to 6 moist
Chroma: 3 or 4
Texture: very gravelly loam, very cobbly loam, extremely cobbly loam, or very cobbly sandy clay loam
Calcium carbonate equivalent: 15 to 40 percent
C horizon:
Hue: 5YR or 7.5YR
Value: 7 dry, 5 or 6 moist
Chroma: 4 to 6
Texture: very cobbly sandy loam, very cobbly loam, extremely cobbly loam, or very gravelly loam
Calcium carbonate equivalent: 15 to 40 percent
Reaction: moderately alkaline or strongly alkaline
COMPETING SERIES: These are the
Arle,
Bigsheep,
Guben,
Tricart and
Whetrock Series. Not yet updated to the Eight Edition of SOIL TAXONOMY is the
Trimad series.
Arle and Whetrock soils are moderately deep.
Bigsheep, Tricart and Trimad soils have moisture control sections affected by peak periods of moisture in the spring and early summer.
Guben soils formed in a thick mantle of mixed volcanic alluvium on pediment surfaces.
GEOGRAPHIC SETTING:
Parent material: slope alluvium and colluvium derived from limestone, sandstone, shale and quartzite
Landform: fan remnants and hills
Slopes: 4 to 50 percent
Elevation: 6,000 to 8,000 feet
Mean annual temperature: 42 to 45 degrees
Mean annual precipitation: 12 to 16 inches
Frost-free period: 90 to 110 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Boxring, Ironco, and Waterhill series. The Boxring soils are shallow with argillic horizons and are on mountain slopes. The Ironco soils have argillic horizons and are on hills and outwash plains. The Waterhill soils have a fine-loamy particle-size control section and are on fan remnants.
DRAINAGE AND PERMEABILITY: Well drained, moderate or high runoff, moderate permeability.
USE AND VEGETATION: These soils are used for rangeland. The potential vegetation is twoneedle pinyon, Utah juniper, black sagebrush, bluebunch wheatgrass, and birchleaf mountain mahogany. This soil has been correlated to Upland Stony Loam (Pinyon-Utah Juniper) 047CY335UT range site at the type location in Utah.
DISTRIBUTION AND EXTENT: Northeastern Utah and in Colorado; LRR E, MLRA 47C; moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Uintah County, Utah, Roosevelt-Duchesne Soil Survey Area, Utah, 1947. The name comes from a geographic feature in the survey area.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches. (Bk1, Bk2, and Bk3 horizons)
Mollic epipedon: The zone from 0 to 10 inches. (A, and Bw horizons)
Calcic horizon: The zone from 10 to 60 inches. (Bk1, Bk2, Bk3, and Bk4 horizons)
The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the Uintah Area Soil Survey.
The surface texture modifier was determined following the guidelines outlined in the Utah document, "Procedures for Distributing Rock Fragments on the Surface Layer into the Upper 6 inches of Soil and Subsequent Naming of Map Units, April 1979."
Taxonomic Version: Eighth Edition, 1998.
The type location was moved to its current location to better reflect the series concept.