LOCATION FILIRAN                 NV

Established Series
Rev. CEJ/GJS/JBF
01/2023

FILIRAN SERIES

The Filiran series consists of moderately deep, well drained soils formed in alluvium derived from volcanic and metamorphic rocks with an admixture of loess. The Filiran soils are on fan piedmonts. Slopes are 2 to 8 percent. The mean annual precipitation is about 230 mm and the mean annual temperature is about 9 degrees C.

TAXONOMIC CLASS: Fine, smectitic, mesic Natrixeralfic Natridurids

TYPICAL PEDON: Filiran silt loam--rangeland. (Colors are for dry soil unless otherwise noted.) The surface is partially covered by approximately 10 percent gravel.

A1--0 to 8 cm; pale brown (10YR 6/3) silt loam, dark brown (10YR 3/3) moist; moderate medium platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine and common medium roots; many very fine and fine vesicular pores; 10 percent gravel; slightly alkaline (pH 7.6); abrupt smooth boundary. (5 to 10 cm thick)

A2--8 to 18 cm; pale brown (10YR 6/3) silt loam, dark brown (10YR 3/3) moist; moderate medium platy structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and medium roots; common very fine and medium tubular pores; 5 percent gravel and 5 percent cobbles; slightly alkaline (pH 7.8); abrupt smooth boundary. (8 to 15 cm thick)

E--18 to 23 cm; light brownish gray (10YR 6/2) gravelly silt loam, brown (10YR 4/3) moist; weak thick platy structure; hard, friable, slightly sticky and slightly plastic; common very fine and medium roots; common very fine and fine tubular pores; 15 percent gravel and 5 percent cobbles; 20 percent very pale brown (10YR 8/2) bleached ped faces; moderately alkaline (pH 8.0); abrupt wavy boundary. (3 to 5 cm thick)

E/B--23 to 30 cm; pale brown (10YR 6/3) gravelly silt loam, dark brown (10YR 3/3) moist; strong fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine, fine and few medium roots; common very fine and fine tubular pores; common distinct clay films on ped faces; 15 percent gravel and 5 percent cobbles; 60 percent very pale brown (10YR 8/2) bleached ped faces; moderately alkaline (pH 8.4); abrupt wavy boundary. (0 to 10 cm thick)

2Btn--30 to 51 cm; light yellowish brown (10YR 6/4) clay, dark yellowish brown (10YR 4/4) moist; strong medium prismatic structure; very hard, very firm, very sticky and very plastic; few very fine and fine roots; common very fine tubular pores; many distinct clay films on ped faces and in pores; 5 percent gravel; slightly effervescent; strongly alkaline (pH 8.8); gradual wavy boundary. (18 to 33 cm thick)

2Btnk--51 to 71 cm; light yellowish brown (10YR 6/4) gravelly clay, dark yellowish brown (10YR 4/4) moist; weak medium prismatic structure parting to strong fine angular blocky; very hard, very firm, very sticky and very plastic; few very fine and fine roots; common very fine tubular pores; many distinct clay films on ped faces and in pores; 20 percent gravel; common lime coats on undersides of rock fragments; common medium threads and filaments of secondary carbonates; strongly effervescent; strongly alkaline (pH 8.8); clear wavy boundary. (10 to 20 cm thick)

2Btnqky--71 to 84 cm; light yellowish brown (10YR 6/4) gravelly clay, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky; very hard, very firm, very sticky and very plastic; few very fine and fine roots; common very fine tubular pores; common distinct clay films on ped faces and in pores; 20 percent discontinuous weak silica cementation; 25 percent gravel and 5 percent cobbles; many medium filaments of secondary carbonates; common medium soft masses of gypsum; strongly effervescent; strongly alkaline (pH 8.6); clear wavy boundary. (8 to 18 cm thick)

2Bqkm--84 to 152 cm; pale brown (10YR 6/3) strongly cemented duripan, brown (10YR 4/3) moist; massive; very hard, very firm; disseminated lime; violently effervescent; strongly alkaline (pH 8.8).

TYPE LOCATION: Lander County, Nevada; approximately 25 miles north of Austin, about 2,000 feet north and l50 feet west of the southeast corner of section 16, T. 23 N., R. 44 E.; USGS Joe Eason Mountain 7.5 minute topographic quadrangle; latitude 39 degrees 51 minutes 39 seconds N and longitude 117 degrees 01 minutes 23 seconds W; WGS84 Decimal Degrees 39.8600000 latitude, -117.0233333 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Moist in winter and spring, dry Mid-June through October; aridic soil moisture regime.
Mean annual soil temperature: 8 to 11 degrees C.
Depth to duripan: 50 to 100 cm.
Depth to carbonates: 30 to 64 cm.

Particle-size control section - Clay content: 35 to 50 percent.
Rock fragments: 5 to 20 percent when mixed, mainly gravel.

A horizon
Value: 3 or 4 moist.
Chroma: 2 or 3.

E horizon
Value: 3 or 4 moist.
Chroma: 2 or 3.
Structure: Platy, subangular blocky, or prismatic structure.
Other features: 15 to 60 percent of ped faces are bleached.

Btn horizon
Hue: 10YR or 2.5Y.
Value: 4, 5, or 6 dry, 3, 4, or 5 moist.
Chroma: 3 or 4.
Texture: Clay, gravelly clay, silty clay, clay loam or silty clay loam.
Exchangeable sodium: 15 to 35 percent.
Carbonates: None to slightly effervescent in the upper part; strongly effervescent to violently effervescent in the lower part.
Reaction: Strongly alkaline or very strongly alkaline.

COMPETING SERIES: This is the Newpass series. Newpass soils are underlain by hard bedrock at a depth of 53 to 90 cm.

GEOGRAPHIC SETTING: Filiran soils are on fan piedmonts. These soils formed in alluvium derived from volcanic and metamorphic rock with an admixture of loess. Slopes are 2 to 8 percent. Elevations are 1,710 to 1,985 meters. The climate is cool, semi-arid with hot, dry summers and cool, moist winters. The mean annual precipitation is 200 to 250 mm; mean annual temperature is 8 to 11 degrees C, and the frost-free season is 100 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Buffaran, Kingingham and Pineval series. Buffaran soils are less than 50 cm deep to an indurated duripan. Kingingham soils are 50 to 76 cm deep to an indurated duripan. Pineval soils have very gravelly subsoils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, slow to medium runoff; moderately low saturated hydraulic conductivity.

USE AND VEGETATION: Rangeland and wildlife habitat. The principal vegetation is mainly Wyoming big sagebrush, Sandberg bluegrass, and bottlebrush squirreltail.

DISTRIBUTION AND EXTENT: Central Nevada. The soil is not extensive. MLRA 24.

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

SERIES ESTABLISHED: Lander County, South Part, Nevada, 1985.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 30 cm (The A1, A2, E and E/B horizons).
Natric horizon - The zone from 30 to 84 cm (2Btn, 2Btnk, and 2Btnqky horizons).
Strongly cemented duripan - The zone from 84 to 152 cm (2Bqkm horizon).
Particle-size control section - The zone from 30 to 80 cm (2Btn and 2Btnk horizons and part of the 2Btnqky horizon).

---

National Cooperative Soil Survey
U.S.A.