LOCATION STODA UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Calcixerolls
TYPICAL PEDON: Stoda loam, rangeland. (Colors are for moist soil unless otherwise noted.)
A11--0 to 6 inches; very dark grayish brown (10YR 3/2) loam, dark brown (10YR 4/3) dry; weak medium platy structure that parts to moderate fine granular; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; slightly calcareous; mildly alkaline (pH 7.6); abrupt smooth boundary. (3 to 7 inches thick)
A12--6 to 11 inches; dark brown (10YR 3/3) loan, dark yellowish brown (10YR 4/4) dry; weak medium subangular blocky structure that parts tv weak fine granular; slightly hard, friable, nonsticky and nonplastic many very fine and fine roots; few fine pores; moderately calcareous; moderately alkaline (pH 8.4); clear wavy boundary. (5 to 15 inches thick)
B2--11 to 19 inches, dark brown (7.5YR 4/3) heavy loam, light yellowish brown (10YR 6/4) dry; moderate medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine and fine roots; common fine and medium pores; strongly calcareous; strongly alkaline (pH 8.6); gradual smooth boundary. (5 to 8 inches thick)
Clca--19 to 29 inches; brown (7.5YR 5/4) loam, pink (7.5YR 7/4) dry; moderate coarse subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; common very fine and fine roots; common very fine pores; strongly calcareous, lime is massive and in veins; strongly alkaline (pH 8.8) clear wavy boundary. (8 to 10 inches thick)
C2ca--29 to 36 inches, light brown (7.5YR 6/4) silt loam, pink (7.5YR 7/4) dry; weak medium subangular blocky structure; hard, firm, sticky and slightly plastic; few very fine and fine roots; common very fine pores; strongly calcareous, line is massive and in veins; strongly alkaline (pH 8.8); clear irregular boundary. (7 to 25 inches thick)
C3ca--36 to 46 inches, brown (7.5YR 5/4) silt loam, very pale brown (10YR 7/4) dry; few coarse faint brownish yellow (10YR 6/6) mottled, massive; hard, friable, sticky and slightly plastic; few very fine and fine roots, many very fine pores; strongly calcareous, lime is massive and in veins; strongly alkaline (pH 9.0); clear smooth boundary. (0 to 12 inches thick)
C4--46 to 67 inches; brown (7.5YR 5/4) very fine sandy loam, very pale brown (10YR 7/4) dry; massive; very friable, slightly sticky and nonplastic; strongly calcareous; strongly alkaline (pH 9.0).
TYPE LOCATION: Morgan County, Utah; about 3 miles north of Peterson; 2,200 feet east and 40 feet south of the NW 1/4 corner of sec . 30, T.SN., R.2E.
RANGE IN CHARACTERISTICS: The mollic epipedon is 11 to 18 inches thick. The soil is calcareous throughout. Depth to the carbonate accumulation layer is 19 to 23 inches. The mean annual soil temperature at a depth of 20 inches ranges from 47 degrees to 49 degrees F. The mean annual temperature temperature ranges from 65 to 70 degrees F. The soils are usually moist when the soil temperature is more than 41 degrees F., but are dry for 65 to 85 consecutive days during the summer. The 10 to 40 inch control section is loam or silt loam and has 18 to 26 percent clay.
The Al horizon has value of 4 or 5 dry, and 2 or 3 moist. It is loam or silt loam. This horizon is slightly or moderately calcareous and mildly or moderately alkaline. It ranges from 11 to 18 inches thick .
The B2 horizon has hue of 10YR or 7.5YR, and chroma of 2 through 4 dry and moist. It ranges from heavy loam to silt loam, or heavy silt loam. This horizon is strongly calcare-ous, moderately and strongly alkaline, and ranges from 5 to 8 inches thick.
The Cca horizon has hue of 7.5YR, 10YR or 2.5Y, value of 6 or 7 dry, and 4 through 6 moist, and chroma of 2 through 4 dry and moist. It is loam or silt loam. This horizon is strongly calcareous, and the lime is veined, blocky or bedded . It is moderately or strongly alkaline and ranges from 26 to more than 41 inched thick. The material below the Cca horizon has hue of 10YR or 7.5YR and value of 6 or 7 dry. It ranges from very fine sandy loam to silty loam or silty clay loam.
COMPETING SERIES: These are the Collinston, Fielding and Welby series. Collinston, Fielding and Welby soils have less than 15 percent coarser than very fine sand in the control section. Also, Welby soils have less than 18 percent clay.
GEOGRAPHIC SETTING: Stoda soils are at elevations of 4,850 to 5,200 feet. They occur on lake terraces and transition slopes between lake terraces. Slope gradients are 10 to 60 percent. These soils formed in mixed lake sediments. The climate is moist subhumid and the average annual precipita-tion ranges from 18 to 20 inches. The mean annual temperature is 45 to 47 degrees F. The mean summer temperature is 63 to 70 degrees F., and the frost-free period ranges from 100 to 105 days.
ASSOCIATED SOILS: These are the Manila, Nebeker, Parleys and Yeats Hollow soils. Manila soils have clay argillic horizons. Nebeker soils have mollic epipedons more than 20 inches thick and have clay argillic horizons. Parleys soils have argillic horizons. Yeates Hollow soils have argillic horizons with more than 35 percent rock fragments.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used for range and wildlife habitat. Some areas are cultivated. Alfalfa and small grains are the principal crops. The present native vegetation is bluebunch wheatgrass, big sagebrush, snowberry, native bluegrass, serviceberry, balsamroot and basin wildrye.
DISTRIBUTION AND EXTENT: Northern Utah. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Morgan County, Morgan Area, Utah, 1974.
OSED scanned by NSSQA. Last revised by state in 1974.
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.