LOCATION TEGURO                  NV+OR

Established Series
Rev. EWB/WED/RLB/JBF
01/2023

TEGURO SERIES

The Teguro series consists of shallow, well drained soils that formed in colluvium and residuum derived from rhyolitic tuff, basalt and similar rock. Teguro soils are on foothills, lava plateaus and mountain side slopes. Slopes are 2 to 50 percent. The mean annual precipitation is about 360 mm and the mean annual temperature is about 7 degrees C.

TAXONOMIC CLASS: Loamy, mixed, superactive, frigid Lithic Argixerolls

TYPICAL PEDON: Teguro gravelly loam--woodland. (Colors are for dry soil unless otherwise noted.) The soil surface is covered with 3 percent stones, 5 percent cobbles and 15 percent gravel.

A1--0 to 5 cm; grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate medium platy structure, parting to weak fine subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; few very fine roots; common very fine tubular and few very fine interstitial pores; 3 percent stones, 5 percent cobbles and 15 percent gravel; neutral (pH 6.8); clear smooth boundary; (3 to 10 cm thick).

A2--5 to 15 cm; brown (10YR 5/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine tubular pores; 20 percent gravel; neutral (pH 6.8); clear smooth boundary; (0 to 15 cm thick).

Bt1--15 to 25 cm; brown (10YR 5/3) gravelly clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine, fine, medium and coarse roots; common very fine tubular pores; 30 percent gravel; common thin and few moderately thick clay films on peds; neutral (pH 6.6); clear smooth boundary; (8 to 15 cm thick)

Bt2--25 to 41 cm; yellowish brown (10YR 5/4) gravelly clay loam, dark yellowish brown (10YR 4/4) moist; moderate fine and medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine, fine, medium and coarse roots; common very fine tubular pores; 20 percent gravel; common moderately thick and few thin clay films on faces of peds; neutral (pH 6.6); abrupt wavy boundary; (8 to 18 cm thick)

R--41 cm; hard unfractured rhyolitic tuff.

TYPE LOCATION: Churchill County, Nevada; in the Stillwater Range; about 200 feet east and 600 feet south of the assumed northwest corner of section 26, T. 20 N., R. 33 E.; USGS Table Mountain 7.5 minute topographic quadrangle;latitude 39 degrees 34 minutes and 25.3 seconds N and longitude 118 degrees 15 minutes and 23.9 seconds W; WGS84 Decimal Degrees 39.5736944 latitude, -118.256639 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Moist in winter and spring, and dry mid-July through early October; xeric soil moisture regime bordering on aridic.
Mean annual soil temperature: 6 to 8 degrees C.
Mollic epipedon: 18 to 30 cm thick, includes all of or the upper part of Bt horizon.
Thickness of A and Bt horizons and depth to bedrock: 25 to 50 cm.
Reaction: Slightly acid to slightly alkaline.

Particle-size control section - Clay content: 25 to 35 percent.
Rock fragments: 15 to 50 percent, mainly gravel and cobbles with weighted average less than 35 percent.

A horizon
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3 dry or moist.

Bt horizon
Hue: 10YR or 7.5YR.
Value: 4 through 6 dry, 3 or 4 moist.
Chroma: 3 or 4 dry, 2 to 4 moist.
Texture: Gravelly loam, gravelly clay loam, very gravelly clay loam or cobbly clay loam.

COMPETING SERIES: These are the Bearskin, Curtis Creek and Parsnip series.

Bearskin soils have a sandy clay loam argillic horizon. Curtis Creek soils have a Bt horizon with a hue of 2.5YR or 5YR. Parsnip soils contain 0 to 5 percent rock fragments.

GEOGRAPHIC SETTING: Teguro soils are on lava plateaus, foothills and mountain side slopes. These soils formed in colluvium and residuum derived from rhyolitic tuff, rhyolite, andesite and basalt. Slopes are 2 to 50 percent. Elevations are 1,830 to 2,440 meters and range to 1,067 meters in Oregon. The climate is cool semi-arid with cool moist winters and warm dry summers. Mean annual precipitation is 300 to 400 mm; mean annual temperature is 4 to 8 degrees C, and the frost-free season is 50 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cleavage and Jobpeak soils. Jobpeak soils lack an argillic horizon. Cleavage soils are loamy-skeletal.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium or rapid runoff; moderately high saturated hydraulic conductivity.

USE AND VEGETATION: Woodland and wildlife habitat. The vegetation is mainly burned singleleaf pinyon pine with an understory of mountain big sagebrush, Idaho fescue, bluebunch wheatgrass and pine bluegrass.

DISTRIBUTION AND EXTENT: Western and central Nevada, southeastern Oregon. The soils are of small extent. MLRA 26, 27, 24, 23 and 10.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Storey County Area, Nevada, 1985.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to about 25 cm (A1, A2 and Bt1 horizons).
Argillic horizon - The zone from 15 to 41 cm (Bt1 and Bt2 horizons).
Lithic contact - The boundary at about 41 cm (R layer).
Xeric soil moisture regime.
Particle-size control section - The zone from 15 to 41 cm (Bt1 and Bt2 horizons).

ADDITIONAL DATA: NASIS pedon and site ID 07NV770Y113jbf.

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National Cooperative Soil Survey
U.S.A.