LOCATION KEIGLEY UTEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Keigley silty clay loam--cultivated. (Colors are for air-dry soil unless otherwise noted.)
Ap--0 to 7 inches; brown (10YR 5/3) silty clay loam, dark brown (10YR 3/3) moist; weak thick platy structure parting to weak medium subangular blocky; hard, firm, sticky and plastic; few very fine roots; few medium and fine pores; strongly calcareous; carbonates are disseminated; mildly alkaline (pH 7.8); abrupt smooth boundary. (6 to 9 inches thick)
A1--7 to 19 inches; brown (10YR 5/3) silty clay loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; very hard, firm, sticky and very plastic; few fine roots; common fine pores; strongly calcareous; carbonates are disseminated; moderately alkaline (pH 7.9); gradual smooth boundary. (6 to 13 inches thick)
A2--19 to 27 inches; brown (7.5YR 5/3) silty clay loam, dark brown (7.5YR 3/3) moist; weak medium subangular blocky structure; very hard, firm, sticky and very plastic; few fine pores; strongly calcareous; carbonates are disseminated; moderately alkaline (pH 8.0); gradual smooth boundary. (5 to 17 inches thick)
C1--27 to 42 inches; light brown (7.5YR 6/3) silty clay loam, brown (7.5YR 5/3) moist; massive; very hard, firm, slightly sticky and plastic; common fine pores; strongly calcareous; carbonates are disseminated; moderately alkaline (pH 7.9); gradual smooth boundary. (9 to 12 inches thick)
C2--42 to 65 inches; light brown (7.5YR 6/3) silty clay loam, brown (10YR 5/3) moist; massive; hard, firm, slightly sticky and plastic; common very fine pores; few krotovinas; strongly calcareous; carbonates are disseminated; moderately alkaline (pH 8.0).
TYPE LOCATION: Utah County; about 2 miles northeast of Santaquin; 200 feet east and 300 feet south of the northwest corner of sec. 31, T. 9 S., R. 2 E.
RANGE IN CHARACTERISTICS: The mollic epipedon is 20 to 36 inches thick. Calcium carbonate equivalent ranges from 15 to 30 percent in the particle-size control section. Mean annual soil temperature is 47 to 54 degrees F. The soils are usually moist but are dry in the moisture control section 60 to 75 consecutive days during the summer. The soils are moderately alkaline or strong alkaline. The particle-size control section is silty clay loam or clay loam containing 27 to 35 percent clay and less than 15 percent sand coarser than very fine sand.
The A horizon has hue of 10YR or 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3.
The C horizon has hue of 10YR or 7.5YR, value of 4 through 7 dry, 2 through 5 moist and chroma of 2 through 4.
COMPETING SERIES: These are the Caldwell, Harana, Jett, Red Rock, Snow and Umpqua (T) series. Caldwell, Snow and Umpqua soils are noncalcareous. In addition, Caldwell soils have gleyed horizons, Snow and Umpqua soils have cambic horizons. Harana, Jett and Red Rock soils have less than 15 percent calcium carbonate equivalent.
GEOGRAPHIC SETTING: Keigley soils are at elevations of 4,500 to 5,600 feet on nearly level and gently sloping flood plains and alluvial fans. They formed in mixed alluvium mainly from shale and limestone. The climate is dry subhumid with mean annual temperature of 45 to 56 degrees F., a mean summer temperature of 70 degrees F., and average annual precipitation of 12 to 16 inches. The freeze-free period is 100 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Benjamin, Birdow, Calita, Doyce, Kirkham, Redola, and Pleasant Vale soils. Benjamin soils have more than 35 percent clay. Birdow and Redola soils have a fine-loamy particle-size control section. Calita soils have a calcic horizon. Doyce soils have an argillic horizon. Kirkham and Benjamin soils have mollic epipedons less than 20 inches thick, and have mottles at depths of 20 to 40 inches. Pleasant Vale soils have mollic epipedons less than 20 inches thick and have less than 18 percent clay in the particle-size control section.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used for irrigated cropland producing alfalfa, small grains, sugar beets, corn, and some apples. Potential vegetation is basin big sagebrush and bluebunch grass.
DISTRIBUTION AND EXTENT: Central and northern Utah. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Sanpete Area, Utah, 1971.
REMARKS: Previously these soils were classified as alluvial soils.
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Lakewood MLRA office, without review of the soil series property data. The remainder of this document has not been updated.