LOCATION HYLOC                   NV

Established Series
Rev: WA/GJS/JBF
03/2017

HYLOC SERIES

The Hyloc series consists of shallow, well drained soils formed in residuum mainly from basalt. Hyloc soils are on mountain side slopes. Slopes are l5 to 50 percent. The mean annual precipitation is about 300 mm and the mean annual temperature is about 8 degrees C.

TAXONOMIC CLASS: Clayey, smectitic, mesic, shallow Aridic Argixerolls

TYPICAL PEDON: Hyloc very cobbly sandy loam--woodland. (Colors are for dry soils unless otherwise noted). Pine needle duff, only under crowns of trees.

A--0 to 8 cm; grayish brown (10YR 5/2) very cobbly sandy loam, very dark grayish brown (10YR 3/2) moist; moderate thick platy structure; slightly hard, very friable, nonsticky and nonplastic; many fine vesicular and very fine interstitial pores; many very fine roots; 20 percent gravel; 20 percent cobbles and 5 percent stones; slightly acid (pH 6.2); abrupt smooth boundary. (8 to 18 cm thick)

Bt1--8 to 13 cm; brown (7.5YR 5/2) very cobbly loam, very dark grayish brown (10YR 3/2) moist; strong fine subangular blocky structure; hard, very friable, slightly sticky and plastic, many fine interstitial pores; many very fine roots; 20 percent gravel, 20 percent cobbles and 10 percent stones; many faint clay films on faces of peds; neutral (pH 6.8); abrupt smooth boundary. (3 to 8 cm thick)

Bt2--13 to 36 cm; brown (7.5YR 5/2) gravelly clay, dark brown (10YR 3/3) moist; moderate medium angular blocky structure; very hard, very firm, sticky and plastic, common very fine tubular and interstitial pores; common fine and coarse, and many medium roots; 15 percent gravel and 5 percent cobbles; continuous distinct clay films on faces of peds and lining pores; neutral (pH 7.0); clear smooth boundary. (18 to 25 cm thick)

Bt3--36 to 46 cm; brown (10YR 5/3) sandy clay loam, dark brown (10YR 3/3) moist, with variable colored partially weathered minerals; massive; hard, very friable, slightly sticky and slightly plastic; many fine interstitial pores; few fine and coarse roots; many faint clay films lining pores; neutral (pH 6.8); abrupt smooth boundary. (0 to 10 cm thick)

Cr--46 to 61 cm; gray (N 6/0) soft, weathered basalt; clear smooth boundary. (5 to 40 cm thick)

R--61 cm; basalt.

TYPE LOCATION: Lyon County, Nevada, about l/4 mile east of Como Cyanide ponds; approximately 800 feet west, and 1,600 feet south of the northeast corner of section l0, T. l5 N., R. 22 E.; USGS Como 7.5 minute topographic quadrangle; latitude 39 degrees, 50 minutes, 55 seconds N and longitude 119 degrees, 29 minutes, 41 seconds W; WGS84 Decimal Degrees 39.1819444 latitude, 39.1819444 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Moist in winter and spring, dry mid June through October; xeric moisture regime bordering on aridic.
Mean annual soil temperature: 8 to 11 degrees C.
Mollic epipedon thickness: 36 to 50 cm, includes all or part of argillic horizon.
Depth to paralithic contact: 36 to 50 cm.
Depth to hard bedrock: 50 to 90 cm.
Reaction: Neutral, except under tree dripline where A horizon is slightly acid.

Particle-size control section - Clay content: 35 to 50 percent.
Rock fragments: 15 to 35 percent, mainly gravel.

A horizon
Value: 2 or 3 moist, some pedons have a very thin Al horizon with values of 6 dry and 4 moist.
Chroma: 2 or 3.
Structure: Platy or granular.

Bt horizons
Hue: l0YR or 7.5YR.
Value: 4 or 5 dry, 3 or 4 moist.
Chroma: 2 through 4.
Texture: Clay loam, loam, sandy clay loam or clay.

COMPETING SERIES: These are the Barbermill, Delma and Wile series.
Barbermill, Delma and Wile lack a lithic contact within 100 cm.

GEOGRAPHIC SETTING: Hyloc soils are on mountain slopes at elevations of 1,675 to 2,285 meters. Slopes are l5 to 50 percent. They formed in residuum weathered dominantly from andesite and basalt. Aspect is usually to the south or west. The climate is cool, semiarid. Mean annual temperature is 7 to 8 degrees C., the mean annual precipitation is 250 to 360 mm, and the average frost-free season is about 90 to l20 days.

GEOGRAPHICALLY ASSOCIATED SOILS: This is the Ister soils. Ister soils are moderately deep and have less than 35 percent clay in the particle-size control section.

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

USE AND VEGETATION: Mainly used for woodland, livestock grazing and wildlife habitat. The vegetation is principally singleleaf pinyon pine, Utah juniper, big sagebrush, antelope bitterbrush, bottlebrush squirreltail and some low sagebrush.

DISTRIBUTION AND EXTENT: Western Nevada. The series is of moderate extent. MLRA 26.

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

SERIES ESTABLISHED: Douglas County Area, Nevada. l98l.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 46 cm (A, Bt1, Bt2 and Bt3 horizons).
Paralithic contact - The zone at 48 cm (Cr layer).
Lithic contact - The zone at 64 cm (R layer).
Particle-size control section - The zone 8 to 46 cm (Bt1, Bt2, and Bt3 horizons).

ADDITIONAL DATA: User Pedon ID: 2006NV019045.

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National Cooperative Soil Survey
U.S.A.