LOCATION CUDAHY UTEstablished Series
TAXONOMIC CLASS: Fine-silty, carbonatic, mesic Petrocalcic Calciaquolls
TYPICAL PEDON: Cudahy silt loam--pastureland. (Colors are for dry soil unless otherwise noted.)
A--0 to 6 inches; dark gray (10YR 4/1) silt loam, black (10YR 2/1) moist; moderate thin platy structure parting to moderate fine granular; hard, friable, slightly sticky and slightly plastic; many fine and medium roots; many medium and fine pores; violently effervescent; moderately alkaline (pH 8.1); abrupt smooth boundary. (3 to 12 inches thick)
Ak--6 to 16 inches; gray (10YR 5/1) silt loam, very dark gray (10YR 3/1) moist; moderate fine prismatic structure parting to moderate fine granular; very hard, firm, slightly sticky and slightly plastic; violently effervescent; 45 percent calcium carbonate equivalent; strongly alkaline (pH 8.6); clear smooth boundary. (6 to 10 inches thick)
Bkg--16 to 23 inches; light gray (2.5Y 7/1) silt loam, gray (5Y 5/1) moist; moderate thick platy structure parting to fine subangular blocky; very hard, firm, moderately sticky and moderately plastic; few fine pores; few fine distinct light yellowish brown (2.5Y 6/4) masses of iron accumulation; violently effervescent; 69 percent calcium carbonate equivalent; moderately alkaline (pH 8.2); abrupt wavy boundary. (5 to 10 inches thick)
Bkm1--23 to 31 inches; light gray (5Y 7/1) cemented material, gray (5Y 5/1) moist; extremely hard, extremely firm; indurated by secondary carbonates; few fine pores; violently effervescent; moderately alkaline (pH 8.0); abrupt wavy boundary. (5 to 10 inches thick)
Bkm2--31 to 44 inches; light gray (2.5Y 7/1) cemented material, gray (2.5Y 5/1) moist; very hard, firm; weakly cemented by secondary carbonates; many fine pores; violently effervescent; moderately alkaline (pH 8.2); clear wavy boundary. (10 to 18 inches thick)
Cg--44 to 60 inches; light gray (5Y 7/1) silty clay loam, gray (5Y 5/1) moist; few fine pores; common fine prominent dark yellowish brown (10YR 4/4) masses of iron accumulation; violently effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Davis County, Utah; about 0.75 mile north and 0.5 mile west of Woods Cross; approximately 660 feet north of the center of section 26, T. 2 N., R. 1 W.; USGS Farmington 7.5 minute topographic quadrangle; 40 degrees 52 minutes 51 seconds north latitude and 111 degrees 55 minutes 14 seconds west longitude, NAD83; UTM zone 12N 422439E, 4525925N, NAD83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 49 to 54 degrees F.
Mean summer soil temperature - 67 to 73 degrees F.
Mollic epipedon thickness - 10 to 16 inches.
Depth to petrocalcic horizon - 20 to 40 inches.
Depth to redoximorphic features - 9 to 20 inches.
Particle-size control section - Clay content: 18 to 26 percent.
Salinity (EC) - 0 to 4 mmhos/cm.
Reaction (pH) - 7.9 to 9.0.
A and Ak horizons - Value: 3 through 5 dry, 2 or 3 moist.
Organic matter content: 1 to 10 percent.
Calcium carbonate equivalent: 30 to 60 percent.
Bkg horizon - Hue: 2.5Y or 5Y.
Value: 6 through 8 dry, 4 through 6 moist.
Chroma: 1 or 2, dry or moist.
Calcium carbonate equivalent: 40 to 75 percent.
Cg horizon - Hue: 2.5Y or 5Y.
Value: 6 through 8 dry, 4 through 6 moist.
Chroma: 1 or 2, dry or moist.
COMPETING SERIES: There are currently no other series in this family.
GEOGRAPHIC SETTING: Cudahy soils are on low lake terraces. These soils formed in lacustrine deposits derived from mixed sources. Slopes are 0 to 3 percent. Elevations range from 4,200 to 4,500 feet. Groundwater high in carbonates have strongly influenced these soils. The climate is dry subhumid with cool, moist winters and warm, dry summers. The mean annual precipitation is 14 to 18 inches. The mean annual temperature is 48 to 52 degrees F. and the mean summer temperature is 67 to 73 degrees F. The frost-free period is 140 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Airport, Croy, Ford, Ironton, Logan, and Warm Springs soils. Airport, Ford, Ironton, Logan and Warm Springs soils do not have petrocalcic horizons. Croy soils have ochric epipedons, natric horizons, and duripans.
DRAINAGE AND PERMEABILITY: Poorly drained; very high surface runoff; moderate permeability (moderately high or high saturated hydraulic conductivity) above the cemented horizon. Endosaturation is present with an apparent seasonal high water table between the soil surface and 2 feet (very shallow to moderately deep free water occurrence classes) between April and August. Cumulative annual duration class is Common.
USE AND VEGETATION: Cudahy soils are used for pasture and meadow hay. Some areas have been drained and are used for irrigated cropland. The native vegetation is mainly inland saltgrass, sedges, and wiregrass.
DISTRIBUTION AND EXTENT: Northwestern Utah. These soils are not extensive with about 1,400 acres of the series mapped to date. MLRA 28A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Davis County (Davis-Weber Area), Utah, 1967.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 16 inches (A and Ak horizons).
Calcic horizon - The zone from 6 to 23 inches (Ak and Bkg horizons).
Petrocalcic horizon - The zone from 23 to 44 inches (Bkm1 and Bkm2 horizons).
Aquic conditions - The conditions of endosaturation, reduction, and redoximorphic features between the soil surface and 24 inches at certain times during normal years (parts of the A, Ak, and Bkg horizons).
Particle-size control section - The zone from 10 to 23 inches (Bkg horizon and part of the Ak horizon).
ADDITIONAL DATA: The typical pedon at the series type location has partial characterization data by the Soils Laboratory from Utah State University (USU) Logan, UT. The data is unpublished. The pH values in the typical pedon are from saturated paste.