LOCATION GUMBLE                  NV+OR

Established Series
Rev. TSB-RLB-JVC-JBF
01/2019

GUMBLE SERIES

The Gumble series consists of shallow, well drained soils that formed in residuum and colluvium derived from tuff or tuffaceous siltstone. Gumble soils are on rock pediments and hills. Slopes are 2 to 50 percent. The mean annual precipitation is about 250 mm and the mean annual temperature is about 8 degrees C.

TAXONOMIC CLASS: Clayey, smectitic, mesic, shallow Xeric Haplargids

TYPICAL PEDON: Gumble very gravelly sandy loam--rangeland. (Colors are for dry soil unless otherwise noted.) The surface is partially covered with 25 percent gravel and 5 percent cobbles.

A1--0 to 5 cm; light brownish gray (10YR 6/2) very gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; weak thick platy structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; many very fine and common fine interstitial pores; 35 percent gravel; neutral (pH 7.2); clear wavy boundary. (5 to 10 cm thick)

A2--5 to 10 cm; light gray (10YR 7/2) gravelly loam, dark grayish brown (10YR 4/2) moist; moderate thick platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and common fine roots; many very fine interstitial and few fine tubular pores; 25 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (5 to 15 cm thick)

Bt1--10 to 23 cm; brown (10YR 5/3) clay, dark brown (10YR 3/3) moist; strong medium prismatic structure parting to strong medium angular blocky; very hard, very firm, very sticky and very plastic; common very fine roots; few very fine interstitial pores; common distinct pressure cutans on faces of peds; 5 percent gravel; slightly alkaline (pH 7.4); clear wavy boundary. (13 to 18 cm thick)

Bt2--23 to 33 cm; brown (10YR 5/3) clay, brown (10YR 4/3) moist; moderate medium prismatic structure parting to strong medium angular blocky; very hard, very firm, very sticky and very plastic; common very fine roots of faces of peds; common very fine interstitial pores; many distinct clay films on faces of peds and lining pores; 5 percent gravel; slightly alkaline (pH 7.5); clear wavy boundary. (5 to 15 cm thick)

Btk--33 to 46 cm; pale brown (10YR 6/3) silty clay, brown (10YR 4/3) moist; weak medium prismatic structure; very hard, firm, very sticky and very plastic; few very fine roots; common very fine interstitial and few fine tubular pores; few distinct clay films on faces of peds; 5 percent gravel; secondary carbonates segregated as common fine filaments; strongly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (2 to 13 cm thick)

Cr--46 to 61 cm; pale brown (10YR 6/3) soft tuffaceous siltstone, brown (10YR 4/3) moist.

TYPE LOCATION: Elko County, Nevada; about 5 miles south of Wilson Reservoir; about 2,640 feet north and 530 feet east of the projected southwest corner of section 28, T. 43 N., R. 50 E.; USGS IL Ranch 7.5 minute topographic quadrangle; latitude 41 degrees 35 minutes 44 seconds N and longitude 116 degrees 22 minutes 32 seconds W; WGS84 Decimal Degrees 41.5955556 latitude, -116.3755556 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually moist in winter and spring, dry in summer and fall; aridic moisture regime that borders on xeric.
Mean annual soil temperature: 8 to 10 degrees C.
Depth to base of argillic horizon: 36 to 50 cm.
Depth to bedrock: 36 to 50 cm to a paralithic contact. The paralithic materials below the contact are soft, weathered tuff or tuffaceous siltstone.

Particle-size control section - Clay content: 35 to 60 percent.
Rock fragments: 5 to 35 percent, mainly gravel with up to 10 percent cobbles in some pedons. Lithology of fragments are volcanic rocks such as basalt.

A horizons
Value: 5 through 7 dry, 3 or 4 moist.
Chroma: 2 or 3, dry or moist.
Clay content: 15 to 27 percent.
Reaction: Neutral or slightly alkaline.

Bt1 and Bt2 horizons
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4, dry or moist.
Texture: Clay, gravelly clay, or clay loam.
Clay fraction: 35 to 60 percent.
Sand fraction: More than 15 percent sand coarser than very fine sand.
Reaction: Neutral or slightly alkaline.

Btk horizon
Value: 4 or 5 moist.
Chroma: 3 or 4, dry or moist.
Texture: Silty clay loam, clay loam, or silty clay.
Rock fragments: 0 to 5 percent.
Reaction: Slightly alkaline or moderately alkaline.
Other features: Thin C horizons are in some pedons.

COMPETING SERIES: These are the Bedzee, Brisbois, Chalco, Espint, and Xman series.

Bedzee soils have mean annual soil temperature of 12 to 15 degrees C. and are effervescent in the Bt horizon. Brisbois soils have paralithic contacts at depths of 10 to 25 cm from the soil surface, are effervescent throughout, and have less than 15 percent fine sand or coarser sands. Chalco soils have less than 15 percent fine sand or coarser sands. Espint soils have paralithic contacts at depths of 15 to 36 cm from the soil surface, have mean annual soil temperature of 12 to 15 degrees C., and are intermittently moist for 10 to 20 days during the summer. Xman soils have mean annual soil temperature of 10 to 12 degrees C. and do not have subhorizons with secondary carbonates.

GEOGRAPHIC SETTING: Gumble soils are on rock pediments and hills. These soils formed in residuum and colluvium derived from tuff or tuffaceous siltstone. Slopes are 2 to 50 percent. Elevations range from 1,375 to 2,015 meters. The climate is semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation is 200 to 300 mm, mean annual temperature is 8 to 9 degrees C, and the frost-free period is 100 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hunnton and Wieland soils. Hunnton soils are moderately deep to duripans. Wieland soils are very deep.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; very high surface runoff; moderately low saturated hydraulic conductivity.

USE AND VEGETATION: Gumble soils are used for livestock grazing and wildlife habitat. The present vegetation is mainly Wyoming big sagebrush, bluebunch wheatgrass, basin wildrye, and cheatgrass.

DISTRIBUTION AND EXTENT: Northeastern Nevada and south-central Oregon. These soils are moderately extensive. The series concept and main acreage is in MLRA 25, while other acreage occurs in MLRAs 10 and 23 in Oregon.

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

SERIES ESTABLISHED: Elko County (Northwest Area), Nevada, 1986.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 10 cm (A1 and A2 horizons).
Argillic horizon - The zone from 10 to 46 cm (Bt1, Bt2, and Btk horizons).
Identifiable secondary carbonates - The zone from 33 to 46 cm (Btk horizon).
Paralithic contact - The boundary at 46 cm to underlying soft, weathered bedrock (Cr layer).
Particle-size control section - The zone from 18 to 46 cm (Bt1, Bt2, and Btk horizons).

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National Cooperative Soil Survey
U.S.A.