LOCATION HART CAMP NV+CA OREstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, frigid, shallow Aridic Argixerolls
TYPICAL PEDON: Hart Camp stony 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 pebbles.
A--0 to 3 inches; brown (10YR 5/3) stony 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 pebbles; neutral (pH 7.0); clear smooth boundary. (1 to 4 inches thick)
BA--3 to 8 inches; brown (10YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; moderate very fine and fine subangular blocky structure; slightly hard, very friable, sticky and plastic; many very fine roots; many very fine tubular pores; 20 percent pebbles; neutral (pH 7.0); clear wavy boundary. (0 to 8 inches thick)
Bt1--8 to 12 inches; brown (10YR 5/3) gravelly clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, very friable, sticky and plastic; many very fine and fine roots; common very fine tubular pores; 25 percent pebbles; many thin clay films on faces of peds and in pores; neutral (pH 7.0); clear wavy boundary. (3 to 10 inches thick)
Bt2--12 to 16 inches; yellowish brown (10YR 5/4) gravelly clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; hard, friable, sticky and plastic; many very fine and fine roots; many very fine tubular pores; 25 percent pebbles; common thin and moderately thick clay films on faces of peds and in pores; neutral (pH 6.7); abrupt irregular boundary. (0 to 6 inches thick)
Cr--16 to 20 inches; light yellowish brown (10YR 6/4) weathered tuff; common thin and few moderately thick clay films at the upper boundary and in few places.
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.; (41 degrees, 53 minutes, 50 seconds north latitude and 119 degrees, 52 minutes, 44 seconds west longitude NAD27.)
RANGE IN CHARACTERISTICS:
Soil moisture - Usually dry; moist winter and spring, dry late June through October.
Soil temperature - 44 to 47 degrees F.
Mollic epipedon thickness - 7 to 15 inches, includes part or all of argillic horizon.
Depth to weathered bedrock horizon - 10 to 20 inches.
Control section - Clay content: Averages 15 to 35 percent.
Rock fragments: Averages 15 to 35 percent.
Profile reaction - Slightly acid to neutral.
A horizon - Value: 4 through 6 dry, 2 or 3 moist. When the surface 7 inches 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 horizon - Other features: Bedrock is weathered in at least the upper 2 inches to as thick as 20 inches.
COMPETING SERIES: This is the Tibbcreek (CA) 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 4,780 to 7,490 feet. The climate is cool, with warm dry summers and cool moist winters. The mean annual precipitation is 10 to 16 inches; mean annual temperature is 41 to 45 degrees F., 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 PERMEABILITY: Well drained; slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: Rangeland and wildlife habitat. The present vegetation is mainly big sagebrush, Thurber needlegrass, bluebunch wheatgrass, basin wildrye and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Northern Nevada and Southeast Oregon. These soils are not extensive.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
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 about 1 inches. (The A,BA, and Bt1 horizons)
Argillic horizon - The zone from 8 to 16 inches. (The Bt1 and Bt2 horizon)
Depth to weathered bedrock - The boundary at 16 inches.
Aridic feature - Soil has an Aridic moisture regime that borders on Xeric.
Particle-size control section - The zone from the soil surface 8 to 16 inches. (The, Bt1 and Bt2 horizons)