LOCATION DACORE UT

Established Series
Rev. AJE/RJL/SJJ
03/2016

DACORE SERIES

The Dacore series consists of very deep, well drained soils that formed in alluvium and slope alluvium derived from andesite, dacite, basalt, and tuff. Dacore soils occur on coalescent alluvial fans. Slopes are 0 to 15 percent. The average annual precipitation is about 275 mm (11 inches) and the mean annual air temperature is about 6.1 degrees C (43 degrees F).

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Calcidic Argiustolls

TYPICAL PEDON: Dacore cobbly loam, rangeland. (Colors are for air dry soil unless otherwise noted.)

A--0 to 4 inches (0 to 10 cm); dark grayish brown (10YR 4/2) cobbly loam, dark brown (7.5YR 3/2) moist; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; common very fine and fine pores; 10 percent gravel and 10 percent cobbles; moderately alkaline (pH 8.2); abrupt smooth boundary. (4 to 8 inches (10 to 20 cm) thick)

Bt--4 to 8 inches (10 to 20 cm); brown (7.5YR 4/2) very gravelly clay loam, dark brown (7.5YR 3/2) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine roots; few fine pores; common distinct clay films; 40 percent gravel and 10 percent cobbles; moderately alkaline (pH 8.0); abrupt smooth boundary. (4 to 11 inches (10 to 28 cm) thick)

Btk--8 to 15 inches (20 to 38 cm); reddish brown (5YR 4/3) very gravelly clay loam, dark brown (7.5YR 3/2) moist; weak fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine roots; few fine pores; few faint clay films; 45 percent gravel and 10 percent cobbles; slightly effervescent; moderately alkaline (pH 8.4); clear smooth boundary. (7 to 20 inches (18 to 50 cm) thick)

Bk--15 to 38 inches (38 to 96 cm); brown (7.5YR 5/4) extremely cobbly sandy loam, brown (7.5YR 4/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few fine roots; few fine interstitial pores; 30 percent gravel and 30 percent cobbles; strongly effervescent; moderately alkaline (pH 8.4); gradual wavy boundary. (10 to 23 inches (25 to 58 cm) thick)

C--38 to 60 inches (96 to 152 cm); brown (7.5YR 5/2) extremely cobbly sand, brown (7.5YR 4/2) moist; single grain; loose; interstitial pores; 40 percent gravel and 30 percent cobbles; slightly effervescent; moderately alkaline (pH 8.4).

TYPE LOCATION: Piute County, Utah; 3 miles south of Koosharem; 50 feet east of the intersection of Utah Highway 62 and county road; about 1,365 feet north and 290 ft east of SW corner of section 10, T.27S., R.1W., SLBM.; USGS Greenwich 7.5 minute quadrangle; lat. 38 degrees 28 minutes 25 seconds N. and long. 111 degrees 54 minutes 12 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:

Soil moisture: Usually dry; moist in winter and early spring and for short periods in summer and fall due to convection storms. (Aridic soil moisture regime, bordering on ustic ).
Mean annual soil temperature: 3.9 to 8.0 degrees C (39 to 46.5 degrees F)
Mean summer temperature: 16.1 to 18.9 degrees C (61 to 66 degrees F)
Depth to argillic horizon: 10 to 20 cm (4 to 8 inches)
Depth to calcic horizon: 20 to 48 cm (8 to 19 inches)
Thickness of the mollic epipedon: 20 to 40 cm (8 to 16 inches)

Particle-size control section (weighted average):
Clay content: 20 to 35 percent
Rock fragments: 35 to 60 percent; lithology of the fragments is from andesite, dacite, basalt, and tuff

A horizon:
Value: 3 through 5 dry, and 2 or 3 moist
Texture: Cobbly loam, gravelly loam or very cobbly loam
Rock fragments: 20 to 60 percent
Calcium carbonate equivalent: 0 to 1 percent
Reaction: Slightly alkaline to moderately alkaline

Bt and Btk horizons:
Hue: 5YR through 10YR
Value: 4 through 6 dry, 3 or 4 moist
Chroma: 2 through 4 dry or moist
Texture: Very gravelly clay loam, very gravelly loam; individual subhorizons may be extremely gravelly clay loam or gravelly clay loam
Clay content: 20 to 35 percent clay
Rock fragments: 35 to 60 percent
Calcium carbonate equivalent: 0 to 5 percent

Bk horizon:
Hue: 5YR through 10YR
Value: 5 through 8 dry, 3 through 6 moist
Chroma: 2 through 4 dry or moist
Texture: Very gravelly sandy loam, extremely cobbly sandy loam, extremely cobbly sand, or extremely gravelly loam
Clay content: 2 to 20 percent
Rock fragments: 40 to 70 percent
Calcium carbonate equivalent: 15 to 30 percent
Reaction: Moderately alkaline or strongly alkaline.

C horizon:
Hue: 5YR through 10YR
Value: 5 through 8 dry, 3 through 6 moist
Chroma: 2 through 4 dry or moist
Texture: Very gravelly sandy loam, extremely cobbly sandy loam, extremely cobbly sand, or extremely gravelly loam
Clay content: 2 to 18 percent clay
Rock fragments: 40 to 70 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: Moderately alkaline to strongly alkaline.

COMPETING SERIES: These are the Circleville, Dullknife, Ipson, Nebies, Sieben, Uracca, and Widtsoe series.
Circleville soils are moderately deep to hard bedrock.
Dullknife soils are moderately deep to hard limestone bedrock.
Ipson soils do not have Btk horizons and have an ustic soil moisture regime.
Nebies soils have an ustic soil moisture regime and the base of the argillic horizon is at 25 cm or less.
Sieben soils have an ustic soil moisture regime and the reaction of the Bt horizons is neutral or slightly alkaline.
Uracca soils have an ustic soil moisture regime, do not have Btk horizons and the reaction of the Bt horizons is neutral or slightly alkaline.
Widtsoe soils have an ustic soil moisture regime and do not have Btk horizons.

GEOGRAPHIC SETTING:
Parent material: alluvium and slope alluvium derived from andesite, dacite, basalt, and tuff
Landform: coalescent alluvial fans
Slopes: 0 to 15 percent
Elevation: 4,500 to 7,500 feet (1,372 to 2,286 m)
Mean annual temperature: 37 to 45 degrees F (2.8 to 7.2 degrees C)
Mean annual precipitation: 8 to 12 inches (200 to 305 mm)
Precipitation pattern: mostly even throughout the year with the exception of a peak increase during the months of July through October
Frost-free period: 45 to 100 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Eldgin and Krueger soils. Krueger soils have mollic epipedons 20 to 36 inches (50 to 91 cm) thick. Eldgin soils have argillic horizons containing 8 to 30 percent rock fragments.

DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate permeability; moderately high or high Ksat class.

USE AND VEGETATION: These soils are used for irrigated cropland and range. The native vegetation is Wyoming big sagebrush, Indian ricegrass, annual forbs and grasses, and some pinyon pine and Utah juniper. Irrigated crops are alfalfa, barley and pasture.

DISTRIBUTION AND EXTENT: Grass Valley near Koosharem in Sevier and Piute Counties, Utah. MLRA 47. The series is moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Sevier County Area, Utah, UT628, 2009.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 4 to 15 inches (10 to 38 cm.) (Bt and Btk horizons)
Mollic epipedon: The zone from the surface of the soil to 15 inches (38 cm.) (A, Bt, Btk horizons)
Argillic horizon: The zone from 4 to 15 inches (10 to 38 cm.) (Bt, Btk horizons)

Calcic horizon: The zone from 15 to 38 inches (38 to 97 cm.) (Bk horizons)

The concept for this series has been narrowed to the Utah semidesert zone at about 8 to 12 inches (200 to 300 mm) of precipitation. Previously, the Utah upland zone at greater than 12 inches (300 mm) of precipitation was included. The moisture regime is aridic bordering ustic consistent with the native vegetation and conceptual break, but is influenced by considerable winter moisture as well.

The cation exchange activity class was inferred from laboratory data from similar soils in the soil survey area.

Taxonomic version: Eleventh Edition, 2010.

National Cooperative Soil Survey
U.S.A.