LOCATION KILFOIL UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Mollic Haploxeralfs
TYPICAL PEDON: Kilfoil loam, rangeland. (Colors are for moist soil unless otherwise noted.)
All--O to 1 inches; dark brown (10YR 3/3) loam, brown (10YR 5/3) dry; weak medium platy structure that parts to moderate fine granular; soft, very friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; many fine pores; mildly alkaline (pH 7.6); abrupt smooth boundary. (1 to 4 inches thick)
A12--1 to 3 inches; dark brown (10YR 3/3) loam, brown (10YR 5/3) dry; moderate very fine granular structure; soft, very friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; few very fine pores; 5 percent soft angular pebbles; slightly calcareous; mildly alkaline (pH 7.8); abrupt smooth boundary. (2 to 5 inches thick)
B21t--3to 7 inches; dark brown (10YR 3/3) light clay loam, pale brown (10YR 6/3) dry; moderate fine subangular blocky structure that parts to moderate medium granular; slightly hard; firm, sticky and slightly plastic; common very fine, fine and medium roots; few fine pores; common thin clay skins on faces of peds; 5 percent soft angular pebbles; slightly calcareous; moderately alkaline (pH 8.0); clear smooth boundary. (3 to 10 inches thick)
B22t--7 to 21 inches; dark brown (10YR 4/3) light clay loam, light yellowish brown (10YR 6/4) dry; weak coarse subangular blocky structure that parts to moderate medium subangular blocky; hard, firm, sticky and slightly plastic; few very fine, fine and medium roots; common fine, few coarse pores; common thin clay skins on faces of peds; 10 percent soft angular gravel; moderately calcareous, lime is disseminated; moderately alkaline (pH 8.4); abrupt irregular boundary. (6 to 18 inches thick)
Cca--21 to 30 inches, yellowish brown (10YR 5/4) gravelly loam, very pale brown (10YR 7/3) dry; weak medium subangular blocky structure that parts to weak medium granular; soft, friable, slightly sticky and slightly plastic; few very fine and medium roots; common fine, few coarse pores; 35 percent soft angular gravel; moderately calcareous; lime is disseminated and veined; strongly alkaline (pH 8.6). (6 to 10 inches thick)
R--30 to 40 inches, weathered sandstone and shale bedrock.
Type Location: Morgan County, Utah; 4.5 miles east and 7 miles north of Croydon; 850 feet west and 2,500 feet south of the NE corner of sec. 13, T.5N., R.4E.
Range in Characteristics: The ochric epipedon ranges from 3 to 6 inches thick. The top of the Cca horizon is immediately below the B2t horizon and is at depths of 13 to 35 inches. Depth to fractured bedrock ranges from 21 to 40 inches. The mean annual soil temperature at depth of 20 inches ranges from 41 to 45 degrees F. The mean summer temperature ranges from 62 to 65 degrees F. The soils are usually moist, but are dry for 65 to 85 consecutive days during the summer. Rock fragments range from 0 to 15 percent in the Al horizon, 0 to 20 percent in the B2t horizon, and 10 to 70 percent in the Cca horizon. Rock fragments below the Al horizon consist of soft, angular fragments of sandstone and shale.
The Al horizon has hue of 10YR through 5Y, value of 4 through 6 dry, 2 through 4 moist, and chroma of 2 through 4 dry and moist. It ranges from loam to silt loam. This horizon is noncalcareous to moderately calcareous, neutral through strongly alkaline, and ranges from 3 to 6 inches thick.
The B2t horizon has hue of 10YR through 5Y, value of 5 through 7 dry, 4 or 5 moist, and chroma of 2 through 4 dry and moist. It ranges from light clay loam to silty clay loam, silt loam, or loam to cobbly sandy clay loam, or gravelly silt loam in some parts . Structure ranges from weak to moderate, very fine through coarse subangular blocky. Clay films are few to continuous, thin and few moderately thick. This horizon is slightly through strongly calcareous, mildly through strongly alkaline, and ranges from 8 to 19 inches thick.
The Cca horizon has hue of 10YR through 5Y, value of 5 through 7 dry, 4 or 5 moist, and chroma of 1 through 6 dry, 1 through 4 moist. It ranges from loam to gravelly or very cobbly loam, sandy clay loam, or very gravelly silt loam. This horizon ranges from moderately to strongly calcareous, and neutral through strongly alkaline.
COMPETING SERIES: These are the Bullnel and Neuske series. Bullnel soils have hue of 10R, 2.5YR or YR in the B2t horizon. Neuske soils have A2 horizons, are more than 40 inches deep and have bisequum profiles.
GEOGRAPHIC SETTING: Kilfoil soils are at elevations of 5,500 to 7,700 feet. They occur on south-facing even or convex mountain slopes. Slopes ranges from 25 to 60 percent. these soils formed in residuum and local alluvium weathered from sandstone and shale. The climate is moist subhumid, and the average annual precipitation ranges from 18 to 25 inches. The mean annual temperature is 39 to 41 degrees F. The mean summer temperature is 59 to 61 degrees F., and the frost-free period ranges from 70 to 80 days.
ASSOCIATED SOILS: These are the Croydon, Hades, Isbell, Moweba and St. Marys soils. All of these soils are more- than 40 inches deep to bedrock. Croydon soils have mean summer temperatures less than 59 degrees F. Hades soils have mollic epipedons more than 20 inches thick. Isbell soils have mollic epipedons. Moweba soils have mollic epipedons more than 20 inches thick and loamy-skeletal control sections. St. Marys soils have mollic epipedons and loamy-skeletal control sections.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability above the bedrock.
USE AND VEGETATION: These soils are used for watershed, range, and wildlife habitat. The present native vegetation is big sagebrush, Gambel oak, serviceberry, basin wildrye, balsamroot and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: These soils occur in northern Utah. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Horgan Area, Horgan County, Utah, 1974.
OSED scanned by NSSQA. Last revised by state 11/74.
REMARKS:
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 Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.