LOCATION SEEPRID UTEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, frigid Pachic Argiustolls
TYPICAL PEDON: Seeprid loam is on northwest-facing, linear to convex 9 percent slopes under browse rangeland at an elevation of 8,100 feet. (Colors are for air-dry soil unless otherwise noted)
A--0 to 4 inches; dark brown (10YR 4/3) loam, very dark grayish brown (10YR 3/2) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; few very fine and fine tubular pores; 5 percent gravel; neutral (pH 6.8); clear smooth boundary. (4 to 9 inches thick)
Bt1--4 to 10 inches; brown (10YR 4/3) clay loam, very dark brown (10YR 2/2) moist; moderate medium and fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine, fine and few medium roots; few very fine and fine tubular pores; few discontinuous faint clay skins on faces of peds; 5 percent gravel; neutral (pH 7.0); abrupt smooth boundary. (0 to 6 inches thick)
Bt2--10 to 18 inches; dark grayish brown (10YR 4/2) clay loam, very dark grayish brown (10YR 3/2) moist; moderate coarse prismatic structure parting to strong fine angular blocky; hard, firm, moderately sticky and moderately plastic; common very fine, fine and few medium roots; few very fine and fine tubular pores; common discontinuous prominent clay skins on faces of peds; 5 percent gravel; neutral (pH 7.2); abrupt irregular boundary. (8 to 23 inches thick)
2Bt3--18 to 28 inches; dark yellowish brown (10YR 4/4) very channery clay, dark brown (10YR 4/3) moist; moderate medium angular blocky structure; hard, very firm, very sticky and very plastic; common very fine and fine roots; few very fine and fine tubular pores; few discontinuous distinct clay skins on faces of peds and rock fragments; 10 percent flagstone, 40 percent channers; slightly alkaline (pH 7.6); abrupt wavy boundary. (0 to 10 inches thick)
2Bk1--28 to 38 inches; very pale brown (10YR 7/4) very channery loam, light yellowish brown (10YR 6/4) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine interstitial pores; 10 percent flagstones, 30 percent channers; slightly effervescent, (16 percent calcium carbonate equivalent), carbonates are disseminated and segregated as few fine irregular and 1 mm thick coatings on rock fragments; moderately alkaline (pH 8.2); clear smooth boundary. (10 to 15 inches thick)
2Bk2--38 to 47 inches; very pale brown (10YR 7/3) extremely channery loam, yellowish brown (10YR 5/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; 65 percent channers; very strongly effervescent, (64 percent calcium carbonate equivalent), carbonates are disseminated and segregated as common fine and medium and 1 mm thick coatings on rock fragments; moderately alkaline (pH 8.4); abrupt smooth boundary. (0 to 9 inches thick)
2Bk3--47 to 58 inches; yellow (10YR 7/6) extremely channery sandy loam, yellowish brown (10YR 5/4) moist; massive; soft, friable, slightly sticky and slightly plastic; 10 percent flagstones, 60 percent channers; very strongly effervescent, (73 percent calcium carbonate equivalent), carbonates are disseminated and segregated as common fine and medium and 1 mm thick coatings on rock fragments; moderately alkaline (pH 8.4); abrupt wavy boundary. (13 to 17 inches thick)
2R--58 inches; sandstone.
TYPE LOCATION: Uintah County, Utah; about 33 miles south of Bonanza, Utah, 2,400 feet west and 1,400 feet south of northeast corner of sec. 35, T.15S., R.23E., SLBM; USGS P R Springs, Utah quadrangle; 39 degrees, 29 minutes, 23 seconds north latitude and 109 degrees, 18 minutes, 31 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil moisture: This soil is driest during June, July, and first half of August. Soil moisture regime is typic ustic.
Mean annual soil temperature: ranges from 42 to 45 degrees F.
Mean summer soil temperature is 60 to 66 degrees F.
Depth to argillic horizon: 4 to 9 inches
Depth to calcic horizon: 25 to 30 inches
Depth to lithologic discontinuity: 25 to 30 inches to clayey residuum
Depth to lithic contact: 40 to 60 inches to sandstone
Thickness of the mollic epipedon: 17 to 32 inches
Particle-size control section (weighted average): 35 to 50 percent clay and 15 to 35 percent sandstone or shale rock fragments.
A horizon:
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 2 or 3.
Bt horizon:
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 2 to 4
Texture: clay loam, channery clay loam, or channery clay in the upper part and very channery clay or very channery clay loam in the lower part
Rock fragments: 5 to 50 percent in any subhorizon but averages 15 to 35 percent
Reaction: neutral to moderately alkaline
Bk horizon:
Hue: 10YR or 2.5Y
Value: 5 to 7 dry and 4 to 6 moist
Chroma: 3 to 6
Texture: very channery loam, extremely channery loam, extremely gravelly loam, very channery sandy loam and extremely channery sandy loam
Rock fragments: 35 to 80 percent
Calcium carbonate equivalent: 15 to 65 percent in the upper Bk horizon and 50 to 75 percent in the lower Bk horizon.
COMPETING SERIES: There are no current competitors. Competitors prior to the Eighth Edition, 1998 Keys to Soil Taxonomy are the Chivington, Gaines, Nabor, Robolata, and Suposo series.
Chivington, Nabor, Robolata, Suposo: do not have a lithic or paralithic contact within 60 inches of the surface.
Gaines: does not have a lithologic discontinuity with clayey-skeletal materials.
GEOGRAPHIC SETTING:
Parent material: eolian deposits over clayey-skeletal residuum derived from sandstone and shale
Landform: hill summits and shoulders
Elevation: 8,100 to 9,200 feet
Slopes: 4 to 25 percent
Average annual precipitation: 16 to 22 inches
Mean annual air temperature: 40 to 43 degrees F.
Mean summer air temperature: 62 to 68 degrees F
Freeze-free period: 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: Moonset, Pathead, Saddlehorse, Tosca, Utso, and Winteridge soils. Moonset soils are less than 20 inches to bedrock. Pathead and Winteridge soils lack a mollic epipedon. Tosca and Saddlehorse soils have mollic epipedon less than 16 inches thick. Utso soils have loamy-skeletal particle-size control sections.
DRAINAGE AND PERMEABILITY: Well drained, low and medium runoff, slow permeability.
USE AND VEGETATION: These soils are used for rangeland, wildlife habitat and recreation. Potential native vegetation is birchleaf mountainmahogany, Utah serviceberry, mountain big sagebrush, salina wildrye, elk sedge and Gambel oak. This soil has been correlated to Mountain Stony Loam (Browse) -048AY451UT range site in Utah.
DISTRIBUTION AND EXTENT: Northeastern Utah. The series is of moderate extent. Approximately 12,000 acres have been mapped to date. LRR E, MLRA 48A.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Uintah County, Uintah Area Soil Survey, Utah, 1998. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 4 to 24 inches. (Bt1, Bt2, and 2Bt3 horizons)
Mollic epipedon: The zone from the surface of the soil to 18 inches. (A, Bt1, and Bt2 horizons)
Argillic horizon: The zone from 4 to 28 inches. (Bt1, Bt2, and 2Bt3 horizons)
Calcic horizon: The zone from 28 to 58 inches. (2Bk2 and 2Bk3)
Lithic contact: The contact with sandstone at 58 inches. (2R layer)
Lithologic discontinuity: The contact with clayey-skeletal residuum at 18 inches.
The classification was changed from Pachic Argiborolls to frigid Pachic Calciustolls 7/98.
The classification was changed from frigid Pachic Calciustolls to frigid Pachic Argiustolls 12/98.
The cation exchange activity class was inferred from laboratory data from similar soils in the Uintah Area Soil Survey.
Taxonomic version: Eighth Edition, 1998.
ADDITIONAL DATA: NSSL sampling and analysis numbers 80P2796-2804 and 80P2780-2787, October 1981.