LOCATION SCIPIO UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, calcareous, mesic Fluvaquentic Endoaquolls
TYPICAL PEDON: Scipio loam - rangeland. (Colors are for air-dry soil unless otherwise stated.)
A1--0 to 5 inches; very dark grayish brown (10YR 3/2) loam; brown (10YR 5/3) dry; weak fine and medium granular structure; slightly hard, friable, slightly sticky, slightly plastic; many very fine and fine roots, and many medium roots; few very fine vesicular pores; violently effervescent; 8 percent calcium carbonate equivalent; moderately alkaline (pH 8.2); abrupt smooth boundary. ( 2 to 5 inches thick.)
A2--5 to 11 inches; dark brown (10YR 3/3) loam; brown (10YR 5/3) dry; weak fine granular structure parting to weak fine subangular blocky; slightly hard, friable, slightly sticky, slightly plastic; many very fine and fine roots and many medium roots; few very fine tubular pores; violently effervescent; 10 percent calcium carbonate equivalent; moderately alkaline (pH 8.2); clear smooth boundary. ( 4 to 7 inches thick.)
A3--11 to 21 inches; very dark grayish brown (10YR 3/2) silt loam; grayish brown (10YR 5/2) dry; few distinct brown (7.5YR 5/4), and strong brown (7.5YR 5/6) redox concentrations; weak fine subangular blocky structure; hard, firm, moderately sticky, moderately plastic; common very fine and fine roots, and common medium roots; few very fine tubular pores; strongly effervescent; 12 percent calcium carbonate equivalent, moderately alkaline (pH 8.4); abrupt smooth boundary. ( 5 to 10 inches thick).
C1--21 to 36 inches; dark yellowish brown (10YR 4/4) sandy loam; light yellowish brown (10YR 6/4) dry; common prominent yellowish red (5YR 5/6) redox concentrations; massive; loose, loose, non sticky and non plastic; common very fine and fine roots and few medium roots; strongly effervescent; 14 percent calcium carbonate equivalent; moderately alkaline (pH 8.4); abrupt smooth boundary. ( 10 to 15 inches thick)
C2--36 to 60 inches; dark grayish brown (10YR 4/2) silt loam; grayish brown (10YR 5/2) dry; few distinct brown (7.5YR 5/4), and strong brown (7.5YR 5/6) redox concentrations; massive; slightly hard, friable, slightly sticky, slightly plastic; few very fine and fine roots; slightly sticky, slightly plastic; few very fine and fine roots; strongly effervescent; 9 percent calcium carbonate equivalent; moderately alkaline (pH 8.4).
TYPE LOCATION: Millard County, Utah; about 7 miles south of the town of Scipio and directly south of Scipio Lake; 2,800 feet north and 2,300 feet west of the southeast corner of sec. 22, T. 20 S., R. 2 W. lat. 39 degrees, 03 minutes, 32 seconds N. long. 112 degrees, 04 minutes, 55 seconds W.
RANGE IN CHARACTERISTICS: Mean annual soil temperature ranges from 48 to 53 degrees F. and mean summer soil temperature ranges from 65 to 68 degrees F. Depth to a seasonal high watertable is 12 to 20 inches.
The particle size control section ranges from 18 to 27 percent clay. Thickness of the mollic epipedon is 10 to 22 inches.
The A horizon has hue of 10YR, value of 4 or 5 dry, and 2 or 3 moist, with chroma of 2 or 3. The lower part of this horizon has chromas of 2 and distinct or prominant redox concentrations.
The C horizon has hue of 7.5YR or 10YR, value of 5 or 6 dry, and 4 moist, with chroma of 2 through 4. Texture is silt loam, loam or sandy loam. Reaction is moderately alkaline to strongly alkaline.
COMPETING SERIES:
Merden (WY) soils have clay in the particle size control section ranging to 35 percent, ESP ranges to 15, and EC ranges to 8.
Normandy (T IL) soils have 2C horizons of sand, hue ranges to 5Y, and have mean annual precipitation of about 36 inches.
Oshawa (MN) soils have clay in the particle size control section ranging to 35 percent, hue ranges to 5Y, and have mean annual precipitation of about 28 inches.
Uncompahgre (CO) soils have clay in the particle size control section ranging to 35 percent, hue ranges to 5Y, and ESP ranges to 15.
Voltaire (NV) soils have accumulations of silica and ESP is over 15.
GEOGRAPHIC SETTING: The Scipio soils are on flood plains. Slopes are 0 to 2 percent. The soil formed in alluvium derived from limestone, sandstone and quartzite. Elevation ranges from 5,700 to 6,000 feet. The mean annual precipitation ranges from 12 to 14 inches. Mean annual air temperature ranges from 46 to 51 degrees F. Freeze-free period is 100 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hiko Peak, Manassa, Mellor, Probert and Sterling soils. Hiko Peak soils do not have a mollic epipedon and have more than 35 percent rock fragments. Manassa soils do not have a mollic epipedon. Mellor soils do not have a mollic epipedon and are influenced with sodium. Probert soils have an argillic horizon and contain 27 to 35 percent clay. Sterling soils have more than 35 percent rock fragments
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; moderate permeability; rare flooding.
USE AND VEGETATION: These soils are used principally for rangeland and nonirrigated pasture. Potential vegetation consists of Kentucky bluegrass, sedges and wiregrass.
DISTRIBUTION AND EXTENT: MLRA 28A; Scipio soils are located in west central, Utah. It is inextensive
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Millard County, Utah, Millard County, Eastern Part Soil Survey, 1995.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic Epipedon - The zone from the surface to about 21 inches. (A1, A2, A3 horizons)
Endoaquoll feature - a seasonal high water table from 6 to 20 inches and redox concentrations in the lower part of the mollic epipedon (A3 horizon). Most of the moisture is from run in.
Fluvaquentic feature - an irregular decrease in organic carbon is assumed.
The classification is based on the "Keys to Soil Taxonomy, Eighth Edition, 1998".