LOCATION GOSUMI                  NV

Established Series
Rev. LIL-MJZ-RLB-JBF
03/2016

GOSUMI SERIES

The Gosumi series consists of deep, well drained soils that formed in residuum and colluvium derived from metamorphic and sedimentary rocks. Gosumi soils are on shoulders and side slopes of mountains. Slopes are 15 to 50 percent. The mean annual precipitation is about 280 mm and the mean annual temperature is about 6 degrees C.

TAXONOMIC CLASS: Clayey-skeletal, smectitic, frigid Aridic Argixerolls

TYPICAL PEDON: Gosumi gravelly loam--rangeland. (Colors are for dry soil unless otherwise noted.) The soil surface is partially covered with 15 percent gravel, 2 percent cobbles and 1 percent stones.

A1--0 to 8 cm; grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine roots; many very fine interstitial pores; 15 percent gravel, 2 percent cobbles and 1 percent stones; neutral (pH 7.0); clear smooth boundary. (5 to 13 cm thick)

A2--8 to 20 cm; grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and few medium roots; many very fine interstitial pores; 15 percent gravel; neutral (pH 6.8); abrupt wavy boundary. (10 to 15 cm thick)

Bt1--20 to 33 cm; brown (10YR 5/3) very gravelly clay loam, dark brown (10YR 3/3) moist; moderate very fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and fine and few medium roots; many very fine interstitial and few very fine tubular pores; many faint clay films on faces of peds and lining pores; 45 percent gravel; neutral (pH 6.8); clear wavy boundary. (10 to 15 cm thick)

Bt2--33 to 53 cm; yellowish brown (10YR 5/4) very gravelly clay, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; hard, friable, very sticky and very plastic; common very fine and fine roots; common very fine tubular pores; common distinct clay films on faces of peds and lining pores; 35 percent gravel; neutral (pH 6.8); clear wavy boundary. (15 to 25 cm thick)

Bt3--53 to 81 cm; yellowish brown (10YR 5/4) very gravelly clay, dark yellowish brown (10YR 4/4) moist; moderate medium angular and subangular blocky structure; very hard, firm, very sticky and very plastic; few very fine and fine roots; common very fine tubular pores; many distinctclay films on faces of peds and lining pores; 35 percent gravel; neutral (pH 6.8); clear wavy boundary. (25 to 30 cm thick)

Bt4--81 to 107 cm; yellowish brown (10YR 5/4) gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; massive; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine interstitial and few very fine tubular pores; many distinct clay films coating and bridging sand grains and gravel; 25 percent gravel; neutral (pH 6.8); clear wavy boundary. (20 to 30 cm thick)

Btk--107 to 127 cm; light yellowish brown (10YR 6/4) very gravelly sandy loam, yellowish brown (10YR 5/4) moist; massive; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine interstitial and few very fine tubular pores; few faint clay films bridging and coating sand grains and gravel; 40 percent gravel; many fine soft masses of carbonate; violently effervescent in carbonate masses, slightly effervescent in matrix; moderately alkaline (pH 8.4); abrupt irregular boundary. (15 to 25 cm thick)

R--127 to 142 cm; light yellowish brown (10YR 6/4) fractured sandstone bedrock, grayish brown (10YR 5/2) moist; yellowish red (5YR 5/6) iron mottles; carbonate coats surfaces of rock fragments and along fractures.

TYPE LOCATION: Humboldt County, Nevada; approximately 4 miles southeast of Winnemucca, about 2,400 feet west and 700 feet north of the southeast corner of section 11, T. 35 N., R. 38 E.; USGS Winnemucca East 7.5 minute topographic quadrangle; latitude 40 degrees 55 minutes 03 seconds N and longitude 117 degrees 40 minutes 07 seconds W; WGS84 Decimal Degrees 40.9175000 latitude, -117.6686111 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry, moist in winter and spring, dry from July through early October; aridic soil moisture regime that borders on xeric.
Mean annual soil temperature: 6 to 8 degrees C.
Mollic epipedon thickness: 25 to 40 cm.
Depth to secondary carbonates: 97 to 107 cm.
Depth to bedrock: 100 to 150 cm.
Reaction: Neutral through strongly alkaline and is more alkaline in the lower subhorizons.

Particle-size control section - Clay content: 35 to 50 percent.
Rock fragments: 35 to 50 percent, mainly gravel.

A horizon
Chroma: 2 or 3.
Structure: Granular or platy.
Consistence: Soft or slightly hard, dry.

Bt horizons
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4.
Texture: Dominantly clay loam or clay but includes strata of gravelly or very gravelly sandy loam in the lower subhorizons.

COMPETING SERIES: These are the Bagard, Blitzen, Fera, Kleckner, Quarz, Slaven and Snellby series.

Bagard soils have a particle-size control section dominated by cobbles and stones and lack secondary carbonates in their substrata. Blitzen, Quarz and Snellby soils are moderately deep to bedrock. Fera soils are noncalcareous. Kleckner soils are more than 150 cm thick, lack Btk horizons, and have Bq horizons that contain 20 to 40 percent durinodes. Slaven soils are moderately deep.

GEOGRAPHIC SETTING: Gosumi soils are on shoulders and side slopes of mountains. These soils formed in residuum and colluvium from mixed metamorphic and sedimentary rocks. Slopes are 15 to 50 percent. Elevations are 1,680 to 2,595 meters. The climate is cool, semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation is 250 to 300 mm, mean annual temperature is 4 to 7 degrees C, and the frost-free season is 70 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Graley, Nomara, Pernty and Sumine soils. Graley soils are 30 to 50 cm to the base of the argillic horizon. Nomara and Sumine soils are moderately deep and have 20 to 35 percent clay in the particle-size control section. Pernty soils have less than 35 percent rock fragments in the particle-size control section.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; rapid runoff; low saturated hydraulic conductivity.

USE AND VEGETATION: Rangeland and wildlife habitat. The present vegetation is mainly low sagebrush, Idaho fescue, and bluebunch wheatgrass.

DISTRIBUTION AND EXTENT: North-central Nevada. These soils are not extensive. MLRA 24.

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

SERIES ESTABLISHED: Humboldt County, Nevada, (BLM Sonoma Planning Unit). 1974.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 33 cm (A1, A2, and Bt1 horizons).
Argillic horizon - The zone from 20 to 127 cm (Bt1, Bt2, Bt3, Bt4, and Btk horizons).
Lithic contact - The boundary at 127 cm (R horizon).
Particle-size control section - The zone from 20 to 70 cm (Bt1, Bt2, and Bt3 horizons).

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National Cooperative Soil Survey
U.S.A.