LOCATION PERNOG NV+OR
Established Series
Rev. PWB/RLB/JBF
10/2019
PERNOG SERIES
The Pernog series consist of shallow, well drained soils that formed in residuum and colluvium derived from quartzite, shale, chert, welded tuffs and rhyolite. The Pernog soils are on mountain crests and side slopes. Slopes are 15 to 50 percent. The mean annual precipitation is about 360 mm and the mean annual temperature is about 6 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Lithic Argixerolls
TYPICAL PEDON: Pernog very stony loam--rangeland. (Colors are for dry soil unless otherwise noted.) The soil surface is partially covered with 1 percent stones.
A1--0 to 8 cm; brown (10YR 4/3) very stony loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine, common medium roots; common very fine interstitial pores; 20 percent gravel, 5 percent cobbles, and 15 percent stones; neutral (pH 6.9); clear smooth boundary. (2 to 10 cm thick)
A2--8 to 25 cm; brown (10YR 4/3) very stony loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine, common medium roots: common very fine interstitial pores; 20 percent gravel, 5 percent cobbles, and 15 percent stones; neutral (pH 7.0); clear wavy boundary. (0 to 25 cm thick)
Bt--25 to 43 cm; brown (10YR 4/3) very stony clay loam, dark brown (10YR 3/3) moist; moderate fine and medium angular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many very fine and fine, common medium roots; common very fine and few tubular pores; few faint clay films on faces of peds and lining pores; 20 percent gravel, 10 percent cobbles, and 20 percent stones; neutral (pH 7.0); clear wavy boundary. (10 to 28 cm thick)
R--43 cm; hard, fractured quartzite with common very fine and fine roots extending down fractures.
TYPE LOCATION: Elko County, Nevada; approximately 27 miles southeast of Elko, about 1 ,700 feet north and 300 feet west of the southeast corner of section 16, T. 30 N., R. 53 E.; USGS Papoose Canyon 7.5 minute topographic quadrangle; latitude 40 degrees 28 minutes 48 seconds N and longitude 116 degrees 00 minutes 19 seconds W; WGS84 Decimal Degrees 40.4813090 latitude, -116.0056940 longitude.
RANGE IN CHARACTERISTICS:
Soil moisture: Moist in winter through early spring, dry from late spring through summer for 45 to 70 consecutive days; xeric soil moisture regime bordering on aridic.
Mean annual soil temperature: 6 to 8 degrees C.
Mollic epipedon thickness: 30 to 50 cm, includes all parts of the argillic horizon.
Depth to bedrock: 30 to 50 cm.
Reaction: Neutral or slightly alkaline.
Particle-size control section - Clay content: Averages 20 to 35 percent.
Rock fragments: 35 to 50 percent, mainly stones.
A horizon
Hue: 10YR or 7.5YR.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3 dry or moist.
Bt horizon.
Hue: 10YR or 7.5YR.
Chroma: 2 or 3 dry or moist.
Value: 4 or 5 dry, 2 or 3 moist.
Texture: Very stony loam, very stony clay loam.
Clay content: 25 to 35 percent.
Structure: Weak or moderate, fine or medium, angular or subangular blocky.
COMPETING SERIES: These are the
Bellenmine,
Celeridge,
Gabica,
Genoa,
Gerdog,
Gidwin,
Grandeposit,
Hawkridge,
Hutchley,
Loope,
Majorsplace,
Mattier,
Melling,
Realmcoy,
Rozara,
Shalcleav, and
Tweener series.
Bellenmine,
Mattier and
Realmcoy soils have a mollic epipedon that is less than 30 cm thick.
Celeridge,
Genoa and
Loope soils average 60 to 80 percent rock fragments in the particle-size control section.
Gabica soils have a mollic epipedon that does not include all parts of the argillic horizon.
Gerdog,
Grandeposit,
Hawkridge and
Rozara soils have dominantly gravel in the particle-size control section.
Gidwin soils have 18 to 24 percent clay and are dry for 75 to 90 consecutive days in the summer.
Hutchley and
Melling soils have a xeric soil moisture regime.
Majorsplace soils are intermittently moist in the upper part for 10 to 20 days cumulative due to convection storms between July and September.
Shalcleav and
Tweener series are 10 to 30 cm deep to bedrock.
GEOGRAPHIC SETTING: Pernog soils are on mountain crests and side slopes. These soils formed in residuum derived from quartzite, shale, chert, welded tuffs and rhyolite. Slopes are 15 to 50 percent. Elevations are 1,465 to 2,535 meters. The climate is cool, semiarid with cold, moist winters and warm, dry summers. The mean annual precipitation is 300 to 460 mm; mean annual temperature is 4 to 8 degrees C, and the frost-free season is 50 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Leevan and the competing
Cleavage,
Pernty and
Tweener soils. Leevan soils have a clay skeletal argillic horizon.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; rapid runoff; moderately high saturated hydraulic conductivity.
USE AND VEGETATION: Rangeland and wildlife habitat. The present vegetation is mainly bluebunch wheatgrass, Idaho fescue, bluegrass, Thurber needlegrass, mountain big sagebrush and curlleaf mountainmahogany.
DISTRIBUTION AND EXTENT: Northeastern Nevada and Southeastern Oregon. These soils are not extensive. MLRA 25.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Elko County, Nevada, Central Part, 1986.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 43 cm A1, A2, Bt horizons).
Argillic horizon - The zone from 25 to 43 cm (Bt horizon).
Lithic contact - The boundary at 43 cm (R layer).
Particle-size control section - The zone from 25 to 43 cm (Bt horizon).
National Cooperative Soil Survey
U.S.A.