LOCATION SCULLY                  WY

Tentative Series
Rev. JR/MR/TWH
06/2011

SCULLY SERIES

The Scully series consists of very deep, well drained soils that formed in slope alluvium derived from sandstone and shale. These soils are on hills. Slopes range from 1 to 20 percent. Mean annual precipitation is about 20 cm (8 inches) and the mean annual temperature is about 5 degrees C (41 degrees F).

TAXONOMIC CLASS: Fine-silty, mixed, active, frigid Ustic Haplocalcids

TYPICAL PEDON: Scully silt loam, on a 4 percent west-facing slope in native rangeland at an elevation of 2070 meters. Described on October 17, 2008. (Colors are for dry soil unless otherwise noted.)

A--0 to 10 cm (0 to 4 inches); light olive brown (2.5Y 5/3) crushed, silt loam, olive brown (2.5Y 4/3) crushed, moist; strong thick platy structure parts to weak thin platy; slightly hard, very friable, slightly sticky, slightly plastic; common fine roots throughout; many very fine vesicular pores; strongly effervescent (9 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); clear wavy boundary. (6 to 12 cm thick)

Bk1--10 to 25 cm (4 to 10 inches); light yellowish brown (2.5Y 6/4) crushed, silty clay loam, olive brown (2.5Y 4/4) crushed, moist; moderate medium angular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; common very fine roots throughout and common medium roots throughout; many fine vesicular pores; common fine distinct threadlike light gray (2.5Y 7/2) carbonate masses with clear boundaries throughout; 1 percent gravel; strongly effervescent (8 percent calcium carbonate equivalent); strongly alkaline (pH 8.5); clear wavy boundary.

Bk2--25 to 46 cm (10 to 18 inches); light yellowish brown (2.5Y 6/4) crushed, silty clay loam, olive brown (2.5Y 4/4) crushed, moist; moderate medium angular blocky structure parts to strong fine subangular blocky; moderately hard, friable, slightly sticky, slightly plastic; common fine roots throughout; many fine irregular pores; few discontinuous distinct carbonate coats on bottom surfaces of rock fragments; common fine distinct threadlike light gray (2.5Y 7/2) carbonate masses with clear boundaries throughout; 2 percent gravel; violently effervescent (21 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); clear wavy boundary.

Bk3--46 to 79 cm (18 to 31 inches); light yellowish brown (2.5Y 6/4) crushed, clay loam, olive brown (2.5Y 4/4) crushed, moist; moderate medium angular blocky structure; moderately hard, friable, slightly sticky, slightly plastic; many fine roots throughout; many fine irregular pores; few discontinuous distinct carbonate coats on rock fragments; many fine distinct threadlike light gray (2.5Y 7/2) carbonate masses with clear boundaries throughout; 5 percent gravel; violently effervescent (23 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); clear wavy boundary. (combined thickness of Bk1, Bk2, Bk3 is 44 to 80 cm)

Bk4--79 to 132 cm (31 to 52 inches); light yellowish brown (2.5Y 6/4) crushed, silty clay loam, light olive brown (2.5Y 5/4) crushed, moist; strong medium angular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; common very fine roots throughout and common fine roots throughout; common fine irregular pores; common fine distinct threadlike light gray (2.5Y 7/2) carbonate masses with clear boundaries throughout; violently effervescent (20 percent calcium carbonate equivalent); strongly alkaline (pH 8.5); clear wavy boundary.

Bk5--132 cm to 201 cm (52 to 79 inches); light yellowish brown (2.5Y 6/4) crushed, silty clay loam, light olive brown (2.5Y 5/4) crushed, moist; moderate medium angular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; common fine roots throughout; common fine irregular pores; common fine distinct threadlike light gray (2.5Y 7/2) carbonate masses with clear boundaries throughout; violently effervescent (18 percent calcium carbonate equivalent); strongly alkaline (pH 8.5). (combined thickness of Bk4, Bk5 is 100 to 140 cm)

TYPE LOCATION: Uinta County, Wyoming; about 18 kilometers (11 miles) west of Carter; located about 2600 feet east and 1950 feet north of the SW corner of sec. 21, T. 17 N., R. 117 W.; Meadow Draw USGS quad; lat. 41 degrees 26 minutes 21.80 seconds N. and long. 110 degrees 38 minutes 44.30 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is usually dry, but intermittently moist during early spring and late fall; Ustic Aridic moisture regime.
Mean annual soil temperature: 3.3 to 7.2 degrees C (38 to 45 degrees F)
Mean summer soil temperature: 15 to 17.7 degrees C (59 to 64 degrees F)
Thickness of the ochric epipedon and depth to cambic horizon: 8 to 12 cm (3 to 5 inches)
Depth to calcic horizon: 20 to 30 cm (8 to 12 inches)
Thickness of the cambic horizon: 15 to 18 cm (6 to 7 inches)

Particle-size control section (weighted averages):
Noncarbonate clay content: 23 to 30 percent
Rock fragment content: 0 to 5 percent gravel
Fine sand and coarser content: 10 to 15 percent

A horizon:
Hue: 7.5YR to 2.5Y
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 3 or 4, dry or moist
Clay content: 18 to 26 percent
Carbonate clay content: 0 to 2 percent
Sand content: 10 to 23 percent
Gravel content: 0 to 2 percent
Calcium carbonate equivalent: 5 to 14 percent
Electrical conductivity: 0 to 2 mmhos/cm
Sodium adsorption ratio: 0 to 1
Reaction: moderately alkaline or strongly alkaline (pH 7.9 to 9.0)

Bk horizon, upper part (a Bw horizon in some pedons):
Hue: 7.5YR to 2.5Y
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 3 or 4, dry or moist
Texture: silty clay loam, clay loam
Clay content: 28 to 38 percent
Carbonate clay content: 1 to 3 percent
Sand content: 10 to 25 percent
Gravel content: 1 to 3 percent
Calcium carbonate equivalent: 5 to 14 percent
Electrical conductivity: 0 to 2 mmhos/cm
Sodium adsorption ratio: 0 to 2
Reaction: moderately alkaline or strongly alkaline (pH 7.9 to 9.0

Bk horizon, lower part:
Hue: 7.5YR to 2.5Y
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 3 or 4, dry or moist
Texture: silty clay loam, clay loam
Clay content: 28 to 38 percent
Carbonate clay content: 3 to 7 percent
Sand content: 10 to 30 percent
Gravel content: 0 to 8 percent
Calcium carbonate equivalent: 15 to 40 percent
Electrical conductivity: 0 to 4 mmhos/cm
Sodium adsorption ratio: 0 to 12
Reaction: moderately alkaline or strongly alkaline (pH 7.9 to 9.0)

COMPETING SERIES: There are currently no series recognized in this family. The Langspring series in a closely related family is fine-loamy and superactive.

GEOGRAPHIC SETTING:
Parent material: slope alluvium derived from sandstone and shale. The type location is in the Cretaceous Hilliard shale Formation.
Landform: footslopes and toeslopes of hills
Slopes: 1 to 20 percent
Elevation: 1829 to 2286 meters (6,000 to 7,500 feet)
Mean annual temperature: 3.3 to 6.1 degrees C (38 to 43 degrees F)
Mean annual precipitation: 178 to 254 mm (7 to 10 inches)
Precipitation pattern: Peak precipitation is in May; lowest is in summer.
Frost-free period: 60 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fiveoh, Pepal, Quealman, and Sandbranch series. Fiveoh soils have less than 18 percent clay and are on alluvial terraces, fan aprons, and broad toeslopes. Pepal soils have less than 18 percent clay. Sandbranch and Quealman soils are on floodplains and low alluvial terraces. Sandbranch soils have a natric horizon, and Quealman soils are coarse-loamy, have irregular decrease in organic carbon, and are stratified.

DRAINAGE AND PERMEABILITY: Well drained, medium runoff, moderate permeability.

USE AND VEGETATION: The major uses are livestock grazing and wildlife habitat. Native vegetation consists of Indian ricegrass, bud sagebrush, bottlebrush squirreltail, and winterfat.

DISTRIBUTION AND EXTENT: Southwestern Wyoming. MLRA 34A. These soils are of moderate extent.

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

SERIES PROPOSED: Uinta County Area soil survey, Wyoming, 2009. The name is from nearby Scully Gap.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from the surface to 200 cm (80 inches).
Particle-size control section: The zone from 25 to 100 cm (10 to 40 inches). (Bk2, Bk3, Bk4 horizons)
Ochric epipedon: from 0 to 10 cm (A horizon).
Cambic horizon: from 10 to 25 cm (Bk1 horizon)
Calcic horizon: from 25 to 201 cm (Bk2, Bk3, Bk4, Bk5 horizons).

Taxonomic Version: Classified according to Keys to Soil Taxonomy, 11th Edition, 2010.

ADDITIONAL DATA: The typical pedon was sampled for the NSSL, soil survey sample number S08WY-041-004.

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National Cooperative Soil Survey
U.S.A.