LOCATION SNOPOC NV
Established Series
Rev: DJM/EWB/WED/JBF
06/2017
SNOPOC SERIES
The Snopoc series consists of very deep, well drained soils that formed in residuum and colluvium derived from granitic rocks. These soils are on mountain side slopes commonly in concave pockets. Slopes are 30 to 75 percent. The mean annual precipitation is about 380 mm and the mean annual temperature is about 6 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Snopoc very gravelly loamy coarse sand--rangeland. (Colors are for dry soil unless otherwise noted.
A1--0 to 5 cm; grayish brown (10YR 5/2) very gravelly loamy coarse sand, very dark grayish brown (10YR 3/2) moist; weak, fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few very fine roots; many very fine interstitial pores; 45 percent gravel; slightly acid (pH 6.5); clear smooth boundary. (3 to 8 cm thick)
A2--5 to 20 cm; brown (10YR 5/3) very gravelly coarse sandy loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine roots; many very fine interstitial pores; 55 percent gravel; neutral (pH 6.7); clear wavy boundary. (10 to 20 cm thick)
A3--20 to 43 cm; brown (10YR 5/3) very gravelly coarse sandy loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine and common medium and coarse roots; common very fine and fine interstitial and few very fine tubular pores; 45 percent gravel, 5 percent cobbles; neutral (pH 6.8); clear wavy boundary. (18 to 30 cm thick)
AC--43 to 53 cm; brown (10YR 5/3) extremely gravelly coarse sandy loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, fine and medium roots; common fine interstitial and very fine tubular pores; 60 percent gravel, 5 percent cobbles; neutral (pH 6.8); gradual smooth boundary. (0 to 15 cm thick)
C--53 to 152 cm; pale brown (10YR 6/3) extremely gravelly coarse sandy loam, brown (10YR 4/3) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine and fine roots; common very fine and fine interstitial and few very fine tubular pores; 65 percent gravel, 5 percent cobbles; neutral (pH 6.8)
TYPE LOCATION: Mineral County, Nevada; in Corey Canyon on the Hawthorn Army Ammunition Depot; about 2,650 feet south and 2,570 feet west of the northeast corner of section 12, T. 7 N., R. 28 E.; USGS Corey Peak 7.5 minute topographic quadrangle; latitude 38 degrees 29 minutes 2 seconds N and longitude 118 degrees 48 minutes 4 seconds W; WGS84 Decimal Degrees 38.4813889 latitude, -118.8047222 longitude.
RANGE IN CHARACTERISTICS:
Soil moisture: Usually moist, moist in winter, and early spring, dry in summer and fall, but intermittently moist due to convection storms, but dry in all parts for at least 45 consecutive days after the summer solstice; xeric soil moisture regime.
Mean annual soil temperature: 5 to 7 degrees C.
Average summer soil temperature: Less than 15 degrees C.
Mollic epipedon thickness: 41 to 64 cm.
Reaction: Slightly acid or neutral.
Particle-size control section - Clay content: 8 to 18 percent.
Rock fragments: 50 to 75 percent gravel (more than one-half of the gravel are 2 to 5 mm in size) and 0 to 10 percent cobbles.
A horizon
Value: 4 or 5 dry, 3 moist.
Chroma: 2 or 3.
C horizon
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4.
Texture: Coarse sandy loam or loam (with coarse sand dominating sand fraction).
Rock fragments: 60 to 80 percent, predominantly 2 to 5 mm gravel.
Structure: Weak subangular blocky prismatic, massive.
Consistence: Soft or slightly hard dry.
COMPETING SERIES:
Behanin,
Badhap,
Behanco, Behanin,
Belsac,
Boydhollow,
Bullrey,
Busterback,
Croesus,
Dressel,
Gateview,
Goodski,
Hapgood,
Harcany,
Hobacker,
Lionhead,
Lolon,
Marcetta,
Nagitsy,
Namela,
Nazaton,
Papaspila,
Parkcity,
Poleline,
Povey,
Snacreek,
Splitbutte and
Tonigut series.
Behanin,
Badhap,
Behanco, Behanin,
Bullrey,
Dressel,
Goodski,
Hapgood,
Lolon,
Papaspila and
Tonigut soils have more than 18 percent clay in the particle-size control section.
Belsac
Croesus, Goodski,
Nagitsy,
Namela and
Splitbutte soils have bedrock within 100 cm.
Boydhollow soils have Bk horizons with calcium carbonate equivalent of 5 to 15 percent.
Busterback soils have 2.5YR and 5YR hues in the substratum and have profiles dominated by loam and sandy loam throughout and receive 400 to 480 mm of precipitation.
Poleline and
Povey soils have more than 10 percent cobbles; more than 50 percent gravel sized fragments are 5 to 76 mm and sand fraction that is dominated by medium sand or finer.
Harcany soils have a mollic epipedon more than 76 cm thick.
Gateview,
Hobacker and
Lionhead soils have carbonates within 100 cm of the surface.
Marcetta soils have an albic horizon.
Nazaton and
Parkcity soils have an udic soil moisture regime.
Snacreek soils have C horizons that are strongly acid or moderately acid.
GEOGRAPHIC SETTING: Snopoc soils are on smooth to concave, north and east facing mountain side slopes. These soils formed in residuum derived from granite. Slopes are 30 to 75 percent. Elevations are 2,560 to 3200 meters. The climate is cold, continental. The mean annual precipitation is 360 to 400 mm, mean annual temperature is 4 to 6 degrees C, and the frost-free season is 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the
Rockabin soils. Rockabin soils are less than 100 cm to bedrock.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, medium or rapid runoff; high saturated hydraulic conductivity.
USE AND VEGETATION: Livestock grazing and wildlife habitat. The native vegetation is mountain big sagebrush, basin wildrye, prairie junegrass, bottlebrush squirreltail, pine bluegrass, lupine, Thurber needlegrass and Eriogonum.
DISTRIBUTION AND EXTENT: West central Nevada. These soils are not extensive. MLRA 26.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Mineral County, Nevada, 1985.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon (pachic) - The zone from the surface to 53 cm (the A1, A2, A3, and AC horizons).
Particle-size control section - The zone from 25 to 100 cm (the lower A3, AC and upper C horizons).
ADDITIONAL DATA: User Pedon ID: 2007NV021127.
National Cooperative Soil Survey
U.S.A.