LOCATION LEETON UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquic Calciustolls
TYPICAL PEDON: Leeton loam - native pasture. (Colors are for air dry soils unless otherwise noted.)
A1--0 to 9 inches; brown (7.5YR 5/2) loam, dark brown (7.5YR 3/2) moist; moderate medium granular and subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; common fine roots; moderately calcareous; moderately alkaline (pH 8.0); clear smooth boundary. (7 to 10 inches thick)
B2--9 to 17 inches; pinkish-gray (7.5YR 6/2) loam, brown (7.5YR 4/2) moist; few fine distinct reddish-brown (5YR 5/4) mottles in the lower part; moderate medium subangular blocky structure; ;slightly hard, friable, slightly sticky, slightly plastic; few fine roots; few fine pores; moderately calcareous, few fine line flecks; moderately alkaline (pH 8.2); clear, smooth boundary (8 to 12 inches thick)
C1ca--17 to 36 inches; pinkish-white (7.5YR 8/2) loam, pinkish gray (7.5YR 7/2) moist; few fine distinct reddish-brown (5YR 5/4) mottles; massive; hard, firm, slightly sticky, slightly plastic; few fine roots; about 15 percent lime accretions up to 1/4 inch in diameter; very strongly calcareous; strongly alkaline, (pH 8.6); gradual wavy boundary. (15 to 25 inches thick)
C2ca--36 to 60 inches; pinkish-white, (7.5YR 8/2) gravelly loam; pinkish-gray (7.5YR 7/2) moist; massive; hard, firm, slightly sticky, slightly plastic; about 20 to 35 percent gravel, cobble and lime accretions; very strongly calcareous; strongly alkaline (pH 8.6).
TYPE LOCATION: Uintah County, Utah; near white rocks; Sec. 18, T. 1 S. R. 1 E. (Unitah meridian)
RANGE IN CHARACTERISTICS: The mollic epipedon ranges from 7 to 10 inches thick. The series control section is loam, heavy fine sandy loam or light clay loam. The mean annual soil temperature is 47 to 49 degrees F. The A1 horizon has hue of 7.5YR or 5YR, values of 2 or 3 moist and 5 dry and chroma of 2 or 3. It is loam or fine sandy loam; and is moderately or strongly calcareous; the B2 horizon has hue of 7.5YR or 5YR, value of 4 or 5 moist, and 5 or 6 dry, and chroma of 2 or 3. It is loam, light clay loam or heavy fine sandy loan, and is moderately or strongly calcareous. The Cca horizon is loam, or light clay loam in the upper part and gravelly loam or gravelly sandy loam in the lower part. It has hue of 5YR or 7.5YR, value of 6 or 7 moist and 7 or 8 dry, and chroma of 2 or 3. The Cca horizon is strongly or very strongly calcareous and strongly or very strongly alkaline. Mottles range from few to common. Depth to seasonal high water table ranges from 20 to 40 inches. Gravel and cobble content in the lower Cca horizon ranges from 20 to 50 percent.
COMPETING SERIES: These are Greenson, Ironton, Roshe Springs and Vineyard soils. Ironton and Vineyard soils are coarse-loamy family and have less than 19 percent clay in the control section. Ironton and Roshe Springs soils have a calcic horizon at depths less than 16 inches. Greenson soils are fine-silty family and have less than 15 percent coarser than very fine sand in the control section. Roshe Springs soils are carbonatic.
GEOGRAPHIC SETTING: These soils are on smooth to gently undulating flood plains and fans. Slopes are mainly 0 to 2 percent. The parent material is strongly calcareous mixed alluvium. Local areas are subject to overflow periodically. These soils are at elevations of 5,000 to 5,500 feet. The climate is semi-arid. The average annual precipitation is 8 to 11 inches. Mean annual air temperature is 45 to 48 degrees F., and the frost-free season is 110 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: They are Ashley, Montwell and Naples soils. All of these soils are well drained, and lack mottles; and all lack both calcic horizons and mollic epipedons.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained or poorly drained; slow to very slow runoff; moderate permeability.
USE AND VEGETATION: Used mainly for pasture, but some are used for irrigated crops, grain and alfalfa. The native vegetation is mainly wiregrass, sedges, foxtail and saltgrass, with some cottonwoods, willows and squawberry.
DISTRIBUTION AND EXTENT: Uintah and Duchesne County, Utah in eastern Utah. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Unita River Valley Area, Utah 1921. Later used also in the Roosevelt-Duchesne Area.
REMARKS: The classification is tentative. Carbonate content may be high enough for carbonatic mineralogy.
OSED scanned by SSQA. Last revised by state on 3/75.
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.