LOCATION RODIE                   NV

Established Series
Rev. JVC/JBF
10/2019

RODIE SERIES

The Rodie series consists of very deep, moderately well drained soils that formed in colluvium derived from volcanic rocks with a component of loess and volcanic ash. Rodie soils are on hills and mountains. Slopes are 15 to 75 percent. The mean annual precipitation is about 330 mm and the mean annual temperature is about 7 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Duridic Haploxerolls

TYPICAL PEDON: Rodie very gravelly loam--rangeland. (Colors are for dry soil unless otherwise noted.) The soil surface is covered with 55 percent gravel, 10 percent cobbles and stones.

A1--0 to 5 cm; light brownish gray (10YR 6/2) very gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine, few medium roots; many very fine and few fine tubular pores; 50 percent gravel; slightly alkaline (pH 7.6); abrupt smooth boundary. (3 to 8 cm thick)

A2--5 to 15 cm; brown (10YR 5/3) very gravelly silt loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common very fine and fine, few medium roots; many very fine and few fine tubular pores; 35 percent gravel; slightly alkaline (pH 7.6); clear smooth boundary. (5 to 10 cm thick)

A3--15 to 36 cm; grayish brown (10YR 5/2) very gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common very fine and fine, few medium roots; many very fine, few fine and medium tubular pores; 50 percent gravel; slightly alkaline (pH 7.8); abrupt irregular boundary. (18 to 36 cm thick)

Bw--36 to 66 cm; pale brown (10YR 6/3) very gravelly loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine, few fine and medium tubular pores; common fine and medium faint grayish brown (10YR 5/2) relict zones of iron depletion; 50 percent gravel; slightly alkaline (pH 7.8); clear wavy boundary. (15 to 48 cm thick)

Bqk1--66 to 76 cm; light yellowish brown (10YR 6/4) very gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; many very fine manganese nodules; many faint silt coats lining pores, on faces of peds, and on rock fragments; 50 percent discontinuous weak silica cementation; 50 percent gravel and 5 percent cobbles; secondary carbonates and silica segregated as few pendants on bottoms of rock fragments; slightly effervescent; moderately alkaline (pH 8.0); abrupt smooth boundary. (5 to 15 cm thick)

Bqk2--76 to 86 cm; very pale brown (10YR 7/3) extremely gravelly sandy loam; dark yellowish brown (10YR 4/4) moist; massive; hard, firm and brittle, nonsticky and nonplastic; few very fine roots; few very fine tubular pores; many very fine manganese nodules; many faint silt coats (skeletans) lining pores; 50 percent gravel and 20 percent cobbles; secondary carbonates and silica segregated as many pendants on bottoms of rock fragments; secondary carbonates also occur as common fine masses and few very fine filaments; strongly effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary. (5 to 15 cm thick)

Bqk3--86 to 99 cm; very pale brown (10YR 7/3) extremely gravelly sandy loam, yellowish brown (10YR 5/4) moist; massive; hard, firm and brittle, nonsticky and nonplastic; few very fine roots; common very fine and fine tubular pores; many very fine manganese nodules; many faint silt coats (skeletans) lining pores; 55 percent gravel and 10 percent cobbles; secondary carbonates and silica segregated as common pendants on bottoms of rock fragments; secondary carbonates also occur as common fine masses and few very fine filaments; strongly effervescent; moderately alkaline (pH 8.4); clear wavy boundary. (10 to 20 cm thick)

Bqk4--99 to 152 cm; very pale brown (10YR 7/3) extremely gravelly loamy coarse sand, brown (10YR 4/3) moist; massive; hard, firm and brittle, nonsticky and nonplastic; few very fine roots; many very fine manganese nodules; 55 percent gravel and 10 percent cobbles; secondary carbonates and silica segregated as common pendants on bottoms of rock fragments; strongly effervescent; moderately alkaline (pH 8.2).

TYPE LOCATION: Elko County, Nevada; about 6 miles northwest of Contact; about 500 feet east and 1,320 feet north of the southwest corner of section 34, T. 46 N., R. 63 E.; USGS Contact 7.5 minute topographic quadrangle; latitude 41 degrees 49 minutes 38 seconds N and longitude 114 degrees 49 minutes 52 seconds W; WGS84 Decimal Degrees 41.8272222 latitude, -114.8311111 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually moist in winter and spring, dry from July through October; aridic soil moisture regime that borders on xeric.
Mean annual soil temperature: 7 to 8 degrees C.
Mollic epipedon thickness: 25 to 38 cm.
Depth to base of cambic horizon: 53 to 86 cm.
Depth to horizons with firm, brittle matrix: 53 to 86 cm.

Particle-size control section - Clay content: Averages 15 to 25 percent. Rock fragments: 50 to 70 percent, dominantly gravel. Lithology of fragments are volcanic rocks such as tuff, rhyolite, or basalt.

A horizons
Value: 5 or 6 dry, 3 or 4 moist; When the upper 18 cm are mixed, the value is 5 dry and 3 moist.
Chroma: 2 or 3, dry or moist.
Reaction: Neutral or slightly alkaline.
Organic matter content: 2 to 4 percent.

Bw horizon
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 2 or 3, dry or moist.
Texture: Very gravelly loam or very gravelly sandy loam.
Clay content: 15 to 25 percent.
Rock fragments: 50 to 60 percent gravel.
Redoximorphic features: Occurs as none to common relict redox concentrations or depletions or iron.

Bqk horizons
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 2 through 4, dry or moist.
Texture: Very gravelly loam, very gravelly sandy loam, or extremely gravelly sandy loam in upper subhorizons with extremely gravelly loamy coarse sand or extremely gravelly sandy loam in the lower subhorizons.
Clay content: 15 to 25 percent.
Rock fragments: 50 to 70 percent, mainly gravel.
Structure: Weak subangular blocky or it is massive.
Reaction: Moderately alkaline or strongly alkaline.
Secondary silica: A brittle matrix which may be discontinuously weakly cemented in some subhorizon above 100 cm and up to 30 percent durinodes common in any subhorizon.
Identifiable secondary carbonates: Occurs as masses and filaments in the matrix and as coats on bottoms of rock fragments.
Calcium carbonate equivalent: 1 to 3 percent.
Redoximorphic features: Common or many manganese nodules; silt coats (skeletans) commonly line pores in the upper subhorizons.

COMPETING SERIES: This is the McCann series. McCann soils have horizons with durinodes in a friable matrix and do not have identifiable secondary carbonates.

GEOGRAPHIC SETTING: Rodie soils are on hills and mountains. They typically occur on backslope positions. These soils formed in colluvium derived from volcanic rocks with a component of loess and volcanic ash. Slopes are 15 to 75 percent. Elevations range from 1,680 to 2,505 meters. The climate is semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation is 300 to 360 mm, mean annual temperature is 6 to 7 degrees C, and the frost-free period is 75 to 95 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Pequop, Quarz, Shalcleav, Shalper, and Sumine soils. All of these soils have argillic horizons and subhorizons which do not have secondary carbonates or silica accumulation.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained; high surface runoff; moderately high saturated hydraulic conductivity.

USE AND VEGETATION: Rodie soils are used for rangeland and wildlife habitat. The present vegetation is mainly black sagebrush, cheatgrass, bottlebrush squirreltail, Idaho fescue, and basin wildrye.

DISTRIBUTION AND EXTENT: Northeastern Nevada. These soils are not extensive. MLRA 25.

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

SERIES ESTABLISHED: Elko County (Northeast Part), Nevada, 1986.

REMARKS: The revision of June 2001 updates the taxonomic class from Loamy-skeletal, mixed, frigid Aridic Duric Haploxerolls and corrects the geographic coordinates of the type location.

Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 36 cm (A1, A2, and A3 horizons).
Cambic horizon - The zone from 36 to 66 cm (Bw horizon).
Duric feature and identifiable secondary carbonates - The zone from 66 to 152 cm (Bqk1, Bqk2, Bqk3, and Bqk4 horizons).
Particle-size control section - The zone from 25 to 100 cm (Bw, Bqk1, Bqk2, Bqk3 and parts of the A3 and Bqk4 horizons).

ADDITIONAL DATA: Previous authors and editors include: ARW-DWW-RLB.

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National Cooperative Soil Survey
U.S.A.