LOCATION HEAPO UTEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, siliceous, mesic Ustic Aquicambids
TYPICAL PEDON: Heapo loamy sand, on a southeast facing, linear, 2 percent slope in irrigated pasture at an elevation of 5,710 feet. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 4 inches; light brown (7.5YR 6/4) loamy sand, dark brown (7.5YR 3/4) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine and few medium roots; common very fine, and few fine tubular pores; very slightly effervescent, (2 percent calcium carbonate equivalent), carbonates are disseminated; slightly alkaline (pH 7.6); abrupt smooth boundary. (4 to 12 inches thick)
Bw--4 to 13 inches; brown (7.5YR 5/4) fine sandy loam, dark brown (7.5YR 4/4) moist; weak fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine, and few medium roots; common very fine and fine, and few medium tubular pores; very slightly effervescent (1 percent calcium carbonate equivalent), carbonates are disseminated and segregated as few fine masses; slightly alkaline (pH 7.6); clear smooth boundary. (6 to 12 inches thick)
2Bk1--13 to 28 inches; light brown (7.5YR 6/4) extremely cobbly loamy sand, strong brown (7.5YR 4/6) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine and few medium roots; common very fine and fine tubular pores; 40 percent gravel, 30 percent cobbles, and 5 percent stones; slightly effervescent, (4 percent calcium carbonate equivalent), carbonates are disseminated and segregated as common fine masses and as less than 1 mm thick coatings around rock fragments; slightly alkaline (pH 7.6); clear wavy boundary. (11 to 36 inches thick)
2Bk2--28 to 42 inches; light brown (7.5YR 6/4) extremely cobbly sand, strong brown (7.5YR 4/6) moist; massive; loose, very friable, nonsticky and nonplastic; common very fine and fine roots; common very fine and few fine tubular pores; 40 percent gravel, 30 percent cobbles, and 5 percent stones; very slightly effervescent (3 percent calcium carbonate equivalent) carbonates are disseminated and segregated as less than 1 mm thick coatings on underside of rock fragments; slightly alkaline (pH 7.6); gradual wavy boundary. (0 to 19 inches thick)
2Bk3--42 to 60 inches; light brown (7.5YR 6/4) extremely cobbly sand, (7.5YR 4/4) moist; single grain; loose, nonsticky and nonplastic; few fine and very fine roots; 35 percent gravel, 40 percent cobbles, 5 percent stones; very slightly effervescent, (2 percent calcium carbonate equivalent) carbonates are disseminated and segregated as less than 1 mm thick coatings on underside of rock fragments; moderately alkaline (pH 8.0).
TYPE LOCATION: Uintah County, Utah; about 5 miles east of Neola; located about 550 feet west and 900 feet north of the southeast corner of sec. 1, T. 1 S., R. 1 W., USBM; Whiterocks, Utah USGS quad; lat. 40 degrees 25 minutes 13 seconds N. and long. 109 degrees 56 minutes 11 seconds W., NAD 27
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is affected by precipitation that falls evenly through the year with a slight increase in late summer and early fall. Aridic moisture regime bordering on ustic.
Mean annual soil temperature: 47 to 52 degrees F.
Depth to lithologic discontinuity: 10 to 24 inches to horizons with greater than 35 percent rock fragments
Depth to secondary calcium carbonate: 10 to 24 inches
Depth to endosaturation: 18 to 42 inches to irrigation induced saturation during the months of April through December.
Particle-size control section: 5 to 15 percent clay and 60 to 80 percent rounded rock fragments of sedimentary and quartzite origin
A horizon: (combination of colors and depths do not meet mollic criteria)
Hue: 5YR or 7.5YR
Value: 4 to 6 dry, 3 or 4 moist
Chroma: 3 to 6 dry, 2 to 4 moist
Rock fragments: 0 to 15 percent (predominantly gravel and cobbles)
Calcium carbonate equivalent: 1 to 5 percent
Reaction: slightly alkaline or moderately alkaline
Bw horizon:
Hue: 5YR or 7.5YR
Value: 4 to 6 dry
Chroma: 4 to 6 dry, 3 to 6 moist
Rock fragments: 0 to 15 percent (predominantly gravel and cobbles)
Calcium carbonate equivalent: 1 to 5 percent
Reaction: slightly alkaline or moderately alkaline
2Bk horizons:
Hue: 2.5YR, 5YR, or 7.5YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 3 to 6 dry or moist
Texture: very cobbly loamy sand, extremely cobbly fine sand, extremely cobbly sand, extremely cobbly loamy sand, extremely stony sand, or extremely stony loamy sand
Rock fragments: 50 to 80 percent gravel, cobbles, and stones
Calcium carbonate equivalent: 1 to 5 percent
Reaction: slightly alkaline or moderately alkaline
COMPETING SERIES: There are no current competitors.
GEOGRAPHIC SETTING:
Parent material: alluvium derived from sedimentary and quartzite rocks
Landform: stream terraces
Slopes: 1 to 3 percent
Elevation: 5,200 to 6,000 feet
Mean annual air temperature: 45 to 49 degrees F.
Mean annual precipitation: 8 to 12 inches
Frost-free period: 110 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abracon, Crib, Lapoint, Robido, and Uver series.
Abracon and
Crib soils have calcic horizons.
Lapoint soils are moderately deep to petrocalcic horizons.
Robido soils have mollic epipedons greater than 20 inches thick.
Uver soils have an irregular decrease of organic carbon and are occasionally flooded.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained, low runoff, moderately rapid permeability.
USE AND VEGETATION: The major use is irrigated pasture.
DISTRIBUTION AND EXTENT: Northeast Utah. LRR D, MLRA 34. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Uintah County, Uintah Area Soil Survey, Utah. 1998. The name is coined from a geographic name in the soil survey area.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches. (Bw, 2Bk1, and 2Bk2 horizons)
Ochric epipedon: The zone from 0 to 4 inches. (A horizon)
Cambic horizon: The zone from 4 to 12 inches. (Bw horizon)
Lithologic discontinuity: At the upper boundary of the 2Bk1 horizon.
Endosaturation: The presence of irrigation induced saturation at 18 to 42 inches during the months of April through December.
In December, 1995, classification was changed from loamy-skeletal, mixed, mesic Ustollic Camborthids to sandy-skeletal, siliceous, mesic Ustic Aquicambids.
The cation exchange activity class was inferred from laboratory data from similar soils in the Uintah Area Soil Survey.
Taxonomic version: Eighth Edition, 1998.
ADDITIONAL DATA: Partial reference sample from pedon S89UT-047-002 in Uintah County, Utah.