LOCATION DAGFLAT UT+NMEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aridic Argiustolls
TYPICAL PEDON: Dagflat very cobbly coarse sandy loam, rangeland. (Colors are for air dry soil unless otherwise noted.)
A1--0 to 2 inches; dark reddish gray (5YR 4/2) very cobbly coarse sandy loam, dark reddish brown (5YR 2/2) moist; moderate fine granular structure; soft, friable, slightly sticky and slightly plastic; many fine roots; 65 percent of the surface is covered with cobbles and stones; slightly acid (pH 6.4); clear smooth boundary. (2 to 12 inches thick)
A2--2 to 6 inches; dark reddish gray (5YR 4/2) coarse sandy loam, dark reddish brown (5YR 2/2) moist; moderate fine and medium granular structure; slightly hard, friable, sticky and plastic; many fine roots; slightly acid (pH 6.2); clear smooth boundary. (0 to 4 inches thick)
BE--6 to 9 inches; reddish brown (5YR 5/3) coarse sandy loam, dark reddish brown (5YR 3/3) moist; moderate medium subangular blocky structure; very hard, firm, sticky and plastic; few fine, medium and coarse roots; common fine pores; slightly acid (pH 6.2); gradual wavy boundary. (0 to 4 inches thick)
Bt1--9 to 17 inches; reddish brown (5YR 5/3) coarse sandy clay loam. dark reddish brown (5YR 3/3) moist; strong coarse subangular blocky structure; very hard, firm, sticky and plastic; few fine and medium roots; common fine pores; common thin clay films on faces of peds and in pores; slightly acid (pH 6.2); gradual wavy boundary. (5 to 13 inches thick)
Bt2--17 to 26 inches; reddish brown (5YR 5/3) coarse sandy loam, reddish brown (5YR 4/3) moist; strong coarse subangular blocky structure; very hard, firm, sticky and plastic; few fine and medium roots; common fine pores; common thin clay films on faces of peds and in pores; slightly acid (pH 6.2); gradual wavy boundary. (4 to 16 inches thick)
C--26 to 30 inches; light brown (7.5YR 6/4) coarse loamy sand, brown (7.5YR 4/2) moist; massive; very hard weathered dacite bedrock that can be cut with a spade. (4 to 18 inches thick)
R--30 inches; bedrock (dacite).
TYPE LOCATION: Washington County, Utah; East Fork of Beaver Dam Washington, near Hamburg Peak at the southwest corner of section 14, T.39S., R.18W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is estimated to range from 47 to 54 degrees F., and the mean summer soil temperature from 65 to 70 degrees F. The soils are usually dry during the period the soil temperature is above 41 degrees F. They are moist in some parts of the moisture control section for 30 to 40 days during the summer months and are dry for 70 to 85 days during the 120 days following the winter solstice.
The mollic epipedon is 10 to 19 inches thick. The solum is 21 to 40 inches thick. The soils are slightly acid or neutral.
The A horizon has hue of 10YR, 7.5YR or 5YR, value of 3 through 5 dry, 2 or 3 moist, and chroma of 2 or 3. It ranges from very cobbly sandy clay loam or coarse sandy clay loam to very cobbly loam.
The Bt horizon has hue of 5YR or 7.5YR, value of 4 through 6 dry, 2 through 4 moist, and chroma of 2 through 4. It is dominantly coarse sandy clay but ranges to clay or coarse sandy clay loam and averages more than 35 percent clay in the upper 20 inches. The horizon has moderate to strong, medium to coarse prismatic structure. Thin to moderately thick clay films and slickensides occur on many faces of peds.
The C horizon is coarse sandy loam or loamy sand and consists of somewhat weathered parent material that is very hard but can be cut with a spade.
COMPETING SERIES: These are the Ascalon, Capulin, Carnero, Hargreave, Harlan, Kirtley, Lavate, Rosebud, Satanta, Wages, and Wolf series. Ascalon, Capulin, Carnero, Harlan, Kirtley, Rosebud, Satanta, Wages and Wolf soils are calcareous in some part of above depth of 40 inches and have continuous horizons of calcium carbonate accumulation. Hargreave and Lavate soils lack a lithic contact at depths of less than 40 inches.
GEOGRAPHIC SETTING: Dagflat soils are on mountain slopes at elevations of 4,500 to 6,500 feet. Slopes range from 30 to 60 percent. These soils formed in residuum weathered from acid igneous rocks. The mean annual temperature is 45 to 52 degrees F., and the mean summer temperature is 70 to 75 degrees F. The average annual precipitation is 14 to 15 inches. The frost free season ranges from 120 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Motoqua, Quazo, and Tacan soils. Motoqua and Quazo soils are less than 20 inches deep to bedrock and Quazo soils lack a mollic epipedon. Tacan soils lack a mollic epipedon and have loamy, skeletal argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: Used as rangeland. Native vegetation is live oak, serviceberry, big sagebrush, pinyon juniper, and tall native bluegrasses.
DISTRIBUTION AND EXTENT: Southwestern Utah. Dagflat soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Washington County, Utah, 1972.
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.