LOCATION HART CAMP               NV+CA OR

Established Series
Rev. JBF/TM
05/2016

HART CAMP SERIES

The Hart Camp series consists of shallow, well drained soils that formed in residuum derived from tuff. The Hart Camp soils are on rock pediment remnants, plateaus, mountains and hills. Slopes are 4 to 50 percent. The mean annual precipitation is about 280 mm and the mean annual temperature is about 6 degrees C.

TAXONOMIC CLASS: Loamy, mixed, superactive, frigid, shallow Aridic Argixerolls

TYPICAL PEDON: Hart Camp gravelly loam--rangeland. (Colors are for dry soil unless otherwise noted.) The surface is partially covered with 2 percent stones, 5 percent cobbles, and 15 percent gravel.

A--0 to 8 cm; brown (10YR 5/3) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate very thin platy structure; soft, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine and fine vesicular and interstitial pores; 2 percent stones, 5 percent cobbles and 15 percent gravel; neutral (pH 7.0); clear smooth boundary. (2 to 10 cm thick)

BA--8 to 20 cm; brown (10YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; moderate very fine and fine subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; many very fine roots; many very fine tubular pores; 20 percent gravel; neutral (pH 7.0); clear wavy boundary. (0 to 20 cm thick)

Bt1--20 to 30 cm; brown (10YR 5/3) gravelly clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, very friable, moderately sticky and moderately plastic; many very fine and fine roots; common very fine tubular pores; 25 percent gravel; many faint clay films on faces of peds and in pores; neutral (pH 7.0); clear wavy boundary. (8 to 25 cm thick)

Bt2--30 to 41 cm; yellowish brown (10YR 5/4) gravelly clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine and fine roots; many very fine tubular pores; 25 percent gravel; common faint and distinct clay films on faces of peds and in pores; neutral (pH 6.7); abrupt irregular boundary. (0 to 15 cm thick)

Cr--41 to 51 cm; light yellowish brown (10YR 6/4) weathered tuff; common faint and few distinct clay films at the upper boundary and in few in the weathered bedrock.

TYPE LOCATION: Washoe county, Nevada; approximately 2,000 feet north of Barrel Springs road; about 2,000 feet east and 1,300 feet south of the northwest corner of section 20, T. 46 N., R. 19 E.; USGS Barrel Springs 7.5 minute topographic quadrangle; latitude 41 degrees 53 minutes 50 seconds N and longitude 119 degrees 52 minutes 48 seconds longitude; WGS84 Decimal Degrees 41.8972222 latitude, -119.880000 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry; moist winter and spring, dry late June through October; aridic soil moisture regime bordering on xeric.
Mean annual soil temperature: 6 to 8 degrees C.
Mollic epipedon thickness: 18 to 38 cm, includes part or all of argillic horizon.
Depth to weathered bedrock: 25 to 50 cm.
Profile reaction: Slightly acid or neutral.

Particle-size control section - Clay content: Averages 15 to 35 percent.
Rock fragments: Averages 15 to 35 percent.

A horizon
Value: 4 through 6 dry, 2 or 3 moist. When the surface 18 cm are mixed, its value is less than 5.5.
Chroma: 2 or 3.
Structure: Weak, fine or medium granular, subangular blocky, thin to thick platy or it is massive.
Consistence: Soft or slightly hard dry.

Bt horizons
Hue: 10YR or 7.5YR.
Value: 4 through 6 dry, 2 through 4 moist.
Chroma: 2 through 4.
Texture: Gravelly sandy clay loam, gravelly clay loam, gravelly loam.
Clay content: 20 to 35 percent. Subhorizons of clay occur in some pedons.
Rock fragments: Averages 15 to 35 percent.
Structure: Weak to strong, fine to coarse subangular or angular blocky or has moderate or strong, fine or medium prismatic in some pedons.

Cr layer
Other features: Bedrock is weathered in at least the upper 5 cm to as thick as 50 cm.

COMPETING SERIES: This is the Tibbcreek series. Tibbcreek soils formed in material weathered from metasedimentary rock.

GEOGRAPHIC SETTING: Hart Camp soils are on rock pediment remnants, plateaus, mountains and hills. These soils formed in residuum weathered from tuff. Slopes are 4 to 50 percent. Elevations are 1,460 to 2,290 meters. The climate is cool, with warm dry summers and cool moist winters. The mean annual precipitation is 250 to 410 mm; mean annual temperature is 5 to 7 degrees C, and the frost-free season is 50 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Madeline, Massacre and Powley soils. Madeline soils are shallow to a lithic contact and have clay Bt horizons. Massacre soils are very deep and have very gravelly Bt horizons. Powley soils have clay Bt horizons and duripans.

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

USE AND VEGETATION: Rangeland and wildlife habitat. The present vegetation is mainly big sagebrush, Thurber's needlegrass, bluebunch wheatgrass, basin wildrye and bottlebrush squirreltail.

DISTRIBUTION AND EXTENT: Northern Nevada and Southeast Oregon. These soils are not extensive. MLRA 23

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

SERIES ESTABLISHED: Washoe County, Nevada, 1974.

REMARKS: Moved the type location April 2006 to better reflect the series concept.

Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 30 cm (A, BA, and Bt1 horizons).
Argillic horizon - The zone from 20 to 41 cm (Bt1 and Bt2 horizon).
Depth to weathered bedrock - The boundary at 41 cm (Cr layer).
Aridic feature - Soil has an aridic moisture regime that borders on xeric.
Particle-size control section - The zone from 20 to 41 cm. (Bt1 and Bt2 horizons).

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National Cooperative Soil Survey
U.S.A.