LOCATION SKUTUMPAH               UT

Established Series
Rev. KWC/VLP
10/2018

SKUTUMPAH SERIES

The Skutumpah series consists of very deep, well drained soils that formed in eolian deposits and slope alluvium derived from sandstone. Skutumpah soils are on sand sheets and structural benches. Slopes range from 2 to 15 percent. Mean annual precipitation is about 14 inches (356 mm) and the mean annual air temperature is about 51 degrees F (10.6 degrees C).

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Aridic Haplustepts

TYPICAL PEDON: Skutumpah fine sandy loam - rangeland (Colors are for dry soil unless otherwise noted.)

A--0 to 4.5 inches (0 to 12 cm); brown (7.5YR 4/3) fine sandy loam, dark brown (7.5YR 3/2), moist; 18 percent clay; weak very fine subangular blocky structure; soft, very friable nonsticky and nonplastic; common very fine and fine roots throughout; common fine irregular and interstitial pores; noneffervescent; neutral, pH 6.8; clear wavy boundary (4 to 6 inches, 10 to 15 cm thick).

Bw1--4.5 to 19 inches (12 to 48 cm); reddish brown (5YR 4/4) fine sandy loam, brown (7.5YR4/2), moist; 19 percent clay; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and medium roots throughout; common fine irregular and interstitial pores; very few faint clay films between sand grains; noneffervescent; neutral, pH 6.8; gradual wavy boundary (11 to 15 inches, 28 to 39 cm thick).

Bw2--19 to 37 inches (48 to 94 cm); yellowish red (5YR 4/6) fine sandy loam, reddish brown (5YR 4/4), moist; 16 percent clay; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots throughout; common fine interstitial pores; very few faint clay films between sand grains; noneffervescent; neutral, pH 6.8; gradual wavy boundary (11 to 18 inches, 29 to 46 cm thick).

C--37 to 64 inches (94 to 163 cm); yellowish red (5YR 5/6) sandy loam, yellowish red (5YR 4/6), moist; 10 percent clay; single grain; loose, nonsticky and nonplastic; common very fine roots throughout; common fine interstitial pores; noneffervescent; neutral, pH 6.8.

TYPE LOCATION: Kane County, Utah; on Skutumpah Terrace just above the White Cliffs about 6.5 miles southwest of Glendale, Utah; lat. 37 degrees 16 minutes 56.08 seconds N. and long. 112 degrees 29 minutes 22.67 seconds W., NAD 83

RANGE IN CHARACTERISTICS:
Soil moisture: aridic ustic moisture regime.
Mean annual soil temperature: 49 to 54 degrees F (9.3 to 12.1 degrees C)
Depth to cambic horizon: 2.5 to 13 inches (6 to 33 cm)

A, Ap Horizons
Hue: 7.5YR, 10YR
Value: 3 to 5 dry, 2.5 to 4 moist
Chroma: 2 to 4 dry, 2 or 3 moist
Texture: fine sandy loam, sandy loam, loamy fine sand, loam
Clay: 8 to 18 percent
Rock fragments: none
Reaction: neutral to slightly alkaline (6.6 to 7.8)

Bw Horizons
Hue: 5YR, 7.5YR, 10YR
Value: 3 to 5 dry, 3 or 4 moist
Chroma: 2 to 6 dry, 2 to 4 moist
Texture: fine sandy loam, sandy loam, loam
Clay content: 9 to 19 percent
Rock fragments: 0 to 10 percent
Reaction: neutral to slightly alkaline (6.6 to 7.8)

C Horizons
Hue: 5YR, 7.5YR, 10YR
Value: 3 to 5 dry, 3 or 4 moist
Chroma: 3 to 6 dry, 2 to 6 moist
Texture: fine sandy loam, sandy loam, loamy fine sand, loam, loamy sand
Clay content: 8 to 18 percent
Rock fragments: 0 to 10
Reaction: neutral to slightly alkaline (6.6 to 7.8)

COMPETING SERIES: These are the Plumsano series. Plumasano soils have visible carbonates and are calcareous throughout.

GEOGRAPHIC SETTING:
Skutumpah soils are on sand sheets and structural benches at elevations of 5,500 to 9,830 feet (1790 to 2240 meters). Slopes range from 2 to 15 percent. The soils formed in eolian deposits and slope alluvium derived from sandstone. Mean annual precipitation ranges is 13 to 17 inches (355 to 432 mm) and mean annual air temperature is 45 to 52 degrees F (8.3 to 11.1 degrees C). Frost-free period is 100 to 147 days. April, May, and June are driest months, with August through October and January through March as the wettest months.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Parkelei(NM), Royosa(NM), Flugle(NM), and Fraguni(NM) series. Parkelei and Flugle soils are on backslopes and shoulders on structural benches and have argillic horizons. The Royosa soils are formed in eolian sands on toeslopes and do not have diagnostic subsurface horizons. Fraguni soils are on summits on structural benches, similar to the Skutumpah soils, but have argillic horizons.

DRAINAGE AND PERMEABILITY: Well drained, low runoff, moderately rapid permeability.

USE AND VEGETATION: Skutumpah soils are used for livestock grazing and wildlife habitat. Vegetation includes Utah juniper, twoneedle pinyon, big sagebrush, antelope bitterbrush, mormon tea, Indian ricegrass, and slender buckwheat.

DISTRIBUTION AND EXTENT: Kane County, Utah; LRR D, MLRA 35; limited extent in southern Utah.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA

SERIES ESTABLISHED: Soil Survey of Kane County, Utah, (UT642) July 2017

REMARKS: Diagnostic horizons and features recognized in this pedon:

Particle-size control section: the zone from 10 to 40 inches. (25 to 100 cm) (Bw1, Bw2, C horizons)
Ochric epipedon: the zone from 0 to 4.5 inches (0 to 12 cm) (A horizons)
Cambic horizon: the zone from 4.5 to 37 inches (12 to 94 cm) (Bw1, Bw2 horizons)

The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.

Skutumpah series are mapped on the Skutumpah Terrace in southern Utah.

Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.