LOCATION PAUDTHEEAGON            UT

Tentative Series
JBD, SAC, SJJ
09/2016

PAUDTHEEAGON SERIES

The Paudtheeagon series consists of deep, well drained soils that formed in slope alluvium and colluvium derived from sandstone and shale. The depth to hard bedrock is 100 to 150 cm. Paudtheeagon soils are on mountains slopes and slides. Slopes range from 35 to 80 percent. Mean annual precipitation is about 660 mm and the mean annual temperature is about 4.5 degrees C.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive Ustollic Haplocryalfs

TYPICAL PEDON: Paudtheeagon loam, on a northwest facing mountain slope, 40 percent slope, in Douglas fir forestland at an elevation of 2593 meters. (Colors are for dry soil unless otherwise noted.) When described on July 22, 2010 the soil was slightly moist throughout.

Oi--0 to 5 cm; slightly decomposed twigs and needles. (0 to 5 cm thick)

Oe--5 to 8 cm; moderately decomposed twigs and needles. (0 to 4 cm thick)

A--8 to 12 cm; brown (10YR 4/3) loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; soft, very friable, slightly sticky and non-plastic; common very fine, fine and medium roots; many fine tubular and irregular pores; neutral (pH 6.8); clear smooth boundary. (4 to 18 cm thick)

Bw--12 to 44 cm; dark yellowish brown (10YR 4/4) loam, dark yellowish brown (10YR 3/4) moist; moderate coarse and medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; common fine tubular and many irregular pores; neutral (pH 6.9); gradual smooth boundary. (0 to 32 cm thick)

Bt1--44 to 77 cm; yellowish brown (10YR 5/4) gravelly clay loam, dark yellowish brown (10YR 3/4) moist; moderate coarse and medium subangular blocky structure; soft, very friable, slightly sticky and moderately plastic; common very fine, fine, medium, and coarse roots; common fine tubular and many irregular pores; few (15 percent) clay bridging in root channels; 20 percent gravel, 10 percent cobbles; neutral (pH 6.9); gradual smooth boundary.

Bt2--77 to 95 cm; yellowish brown (10YR 5/6) gravelly clay loam, dark yellowish brown (10YR 4/6) moist; moderate coarse and medium subangular blocky structure; soft, very friable, slightly sticky and moderately plastic; common very fine, fine, medium, and coarse roots; common fine tubular and many irregular pores; few (20 percent) clay films on ped faces; 20 percent gravel; neutral (pH 7.0); clear smooth boundary.

Bt3--95 to 140 cm; yellowish brown (10YR 5/6) very paragravelly sandy clay loam, dark yellowish brown (10YR 4/6) moist; moderate coarse and medium subangular blocky structure; soft, very friable, slightly sticky and moderately plastic; common very fine, fine, medium, and coarse roots; common fine tubular and many irregular pores; few (10 percent) clay films on ped faces and rock faces, few (10 percent) clay bridging in root channels; 30 percent paragravel, 10 percent stones; neutral (pH 7.0); abrupt smooth boundary. (The combined thickness of the Bt horizons is 51 to 98 cm)

R--140 cm; hard argillaceous sandstone.

TYPE LOCATION: Grand County, Utah; about 18 miles northwest of Thompson Springs, Utah; located about 2257 feet west and 2119 feet north of the SE corner of sec. 23, T. 18 S., R. 19 E.; USGS Floy Canyon North quad; lat. 39 degrees 13 minutes 38 seconds N. and long. 109 degrees 47 minutes 25 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is Udic, bordering on Ustic.
Mean annual soil temperature: 4.5 to 6.5 degrees C.
Mean summer soil temperature: 7.0 to 14.5 degrees C.
Depth to lithic contact: 100 to 150 cm.
Depth to argillic horizon: 10 to 44 cm.
Thickness of the Ochric Epipedon: 4 to 20 cm.

Particle-size control section (weighted averages):
Clay content: 20 to 34 percent
Fine sand and coarser sand content: 20 to 45 percent
Rock fragment content: 5 to 30 percent; gravel, paragravel and cobbles

A horizon(s):
Hue: 7.5YR or 10YR
Value: 3 to 5 dry, 2 or 3 moist
Chroma: 2 to 4 dry or moist
Texture: loam or very fine sandy loam
Clay content: 15 to 22 percent
Rock fragments: 0 to 10 percent total; 0 to 10 percent gravel, 0 to 10 percent cobbles.
Pararock fragments: 0 to 10 percent paragravel.
Reaction: neutral to slightly alkaline (pH 6.6 to 7.8)

Bt horizon(s):
Hue: 7.5YR or 10YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 4 to 6 dry or moist
Texture: loam, gravelly loam, clay loam, gravelly clay loam, paragravelly clay loam, very paragravelly sandy clay loam.
Clay content: 20 to 34 percent
Rock fragments: 10 to 30 percent total; 0 to 25 percent gravel, 0 to 15 percent cobbles, and 0 to 10 percent stones.
Pararock fragments: 0 to 30 percent paragravel.
Reaction: neutral to slightly alkaline (pH 6.6 to 7.8).

BC horizon: is present in some pedons.

COMPETING SERIES: These are the Amesmont, Briston, Dunlatop, and Ula series.
Amesmont and Ula have a paralithic contact between 50 and 100 cm. Briston is greater than 150 cm to bedrock.
Dunlatop has a B/E horizon and a lithologic discontinuity influenced by volcanic ash.

GEOGRAPHIC SETTING:
Parent material: slope alluvium and/or colluvium derived from sandstone, shale, and limestone.
Landform: mountain slopes and slides.
Slopes: 35 to 80 percent.
Elevation: 2450 to 2800 meters.
Mean annual temperature: 3.5 to 5.5 degrees C.
Mean annual precipitation: 610 to 710 mm.
Precipitation pattern: Soil moisture control section is usually moist throughout the year, with occasional intermittent drying during the summer. Udic soil moisture regime, bordering on Ustic.
Frost-free period: 50 to 70 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Beje, Senchert and Wildcow series. The Beje soils are on convex positions and have bedrock at less than 50 cm. The Senchert soils are on similar positions, but have a mollic epipedon, bedrock at 50 to 100 cm, and are under aspen patches. The Wildcow soils are on similar positions, but have a mollic epipedon and are greater than 150 cm to bedrock.

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

USE AND VEGETATION: This soil is mainly used for forestland and wildlife. Native vegetation is Rocky Mountain Douglas fir, Quaking aspen, White fir, Mountain snowberry, Oregon grape, and Mountain brome. Utah correlates this soil to High Mountain Very Steep Loam Douglas Fir F048AY530UT.

DISTRIBUTION AND EXTENT: Central Utah mountains; LRR E, MLRA 48A; The Series is of small extent.

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

SERIES PROPOSED: Grand County, Utah, 2015. Uintah and Ouray Indian Reservation, Utah. The Paudtheeagon name is coined. In the Ute language Paudtheeagon means "Elk Home".

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
The surface is covered by 1 percent stones and 2 percent boulders.
Series control section: The zone from o to 140 cm.
Particle-size control section: The zone from 44 to 94 cm, top 50 cm of argillic horizon. (Bt1 and Bt2 horizons)
Ochric epipedon: The zone from 0 to 12 cm. (Oi, Oe and A horizons)
Argillic horizon: The zone from 44 to 140 cm. (Bt1, Bt2, and Bt3 horizons)
Lithic contact: Contact with hard sandstone bedrock at 140 cm. (R horizon)

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

Taxonomic Version: Classified according to Keys to Soil Taxonomy, Twelfth Edition, 2014.

ADDITIONAL DATA:
The previous name of this series was Heegon. The complete Ute name was restored.

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National Cooperative Soil Survey
U.S.A.