LOCATION MILLVILLE UT+IDEstablished Series
TAXONOMIC CLASS: Coarse-silty, carbonatic, mesic Typic Haploxerolls
TYPICAL PEDON: Millville silt loam--cultivated. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 6 inches; dark grayish brown (10YR 4/3) silt loam, very dark grayish brown (10YR 3/2) moist; weak medium granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; few medium pores; very strongly calcareous; moderately alkaline (pH 7.9); gradual smooth boundary. (6 to 11 inches thick)
A--6 to 12 inches; grayish brown (10YR 5/2) silt loam, very dark grayish brown (10YR 3/2) moist; very weak medium granular structure; hard, friable, slightly sticky and slightly plastic; many fine roots; very strongly calcareous; moderately alkaline (pH 8.0); gradual smooth boundary. (0 to 12 inches thick)
AC--12 to 24 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; many fine pores; very strongly calcareous; moderately alkaline (pH 8.0); gradual smooth boundary. (0 to 12 inches thick)
C1--24 to 25 inches; pale brown (10YR 6/3) silt loam, brown (10YR 4/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; many fine pores; very strongly calcareous; moderately alkaline (pH 8.0); gradual smooth boundary. (9 to 29 inches thick)
C2--35 to 65 inches; light gray (10YR 7/2) silt loam, grayish brown (10YR 5/2) moist; massive, slightly hard, friable, slightly sticky and slightly plastic; few fine roots; few fine pores; very strongly calcareous; moderately alkaline (pH 8.1).
TYPE LOCATION: Cache County, Utah; 1/4 mile north of USU Dairy Farm Headquarters, 40 feet north and 100 feet west of the northeast corner of the southeast 1/4 sec. 22, T. 12 N., R. 1 E.
RANGE IN CHARACTERISTICS: The mollic epipedon ranges from 11 to 20 inches thick. The mean annual soil temperature is 48 to 51 degrees F., and the mean summer temperature from 63 to 68 degrees F. The soil contains 40 to 60 percent calcium carbonate equivalent. The particle-size control section is silt loam that contains less than 18 percent clay and less than 15 percent fine and coarser sand.
The A horizon has hue of 10YR, value of 4 or 5 dry and between 3 and 3.5 moist, and chroma of 2 or 3. It is mildly alkaline or moderately alkaline and is strongly calcareous or very strongly calcareous. It contains from 1.5 to 3.5 percent organic matter.
The C horizon has hue of 10YR of 2.5Y, value of 5 through 7 dry and 3 through 6 moist, and chroma of 2 or 3. It is mildly alkaline or moderately alkaline.
COMPETING SERIES: There are no competing series in this family.
GEOGRAPHIC SETTING: Millville soils are on smooth, slightly convex slopes on alluvial fans at elevations of 4,500 to 5,100 feet. Slopes are 0 to 6 percent. Millville soils formed in alluvium derived mainly from dolomitic limestone. The climate is dry subhumid. The average annual precipitation is 15 to 18 inches, mean annual temperature if 47 to 49 degrees F., and the mean summer temperature is 68 to 72 degrees F. The freeze-free period is 140 to 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Nibley, Parleys, and Timpanogos soils. Nibley, Parleys, and Timpanogos soils have argillic horizons and contain less than 40 percent carbonates.
DRAINAGE AND PEREMABILITY: Moderately well and well drained; slow runoff; moderate permeability.
USE AND VEGETATION: These soils are mostly irrigated and cropped to alfalfa and small grains or used for pasture. The potential vegetation is big sagebrush and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Northern Utah. These soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Cache Valley Survey, Utah, 1913. The name is taken from a small community in Cache County.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon: from 0 to 12 inches (Ap and A horizons).
Classification: Keys to Soil Taxonomy, Eighth Edition, 1998.