LOCATION SHAR                    ID

Established Series
Rev. RWW/TDT/CBR
05/2018

SHAR SERIES

Landscape--lava fields
Landform--lava flows
Slope--0 to 12 percent
Parent material--loess-influenced alluvium over residuum derived from basalt
Mean annual precipitation--about 350 mm
Mean annual air temperature--about 5 degrees C
Depth class--shallow to a duripan
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid

TAXONOMIC CLASS: Fine, smectitic, frigid Pachic Argixerolls

TYPICAL PEDON: Shar silt loam in an area of rangeland. (Colors are for dry soil unless otherwise noted.)

A--0 to 10 cm; grayish brown (10YR 5/2) silt loam, very dark brown (10YR 2/2) moist; weak thin platy structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and common coarse roots; many very fine tubular pores; slightly acid (pH 6.4); clear smooth boundary

Bt1--10 to 20 cm; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; strong very fine angular blocky structure; slightly hard, firm, moderately sticky and moderately plastic; many very fine and fine and common medium and coarse roots; many very fine tubular pores; few distinct clay films on faces of peds and in pores; slightly acid (pH6.2); gradual wavy boundary

Bt2--20 to 33 cm; grayish brown (10YR 5/2) silty clay loam, dark brown (10YR 3/3) moist; strong coarse columnar structure; very hard, very firm, very sticky and very plastic; common very fine and fine roots; few very fine irregular pores; common distinct clay films on faces of peds and surfaces along pores; slightly acid (pH 6.4); gradual wavy boundary

Btss1--33 to 69 cm; brown (10YR 5/3) silty clay, dark brown (10YR 3/3) moist; strong coarse columnar structure; very hard, very firm, very sticky and very plastic; common very fine and fine roots; few very fine irregular pores; many prominent clay films on faces of peds and surfaces along pores; many prominent slickensides; slightly acid (pH 6.4); clear wavy boundary

Btss2--69 to 89 cm; grayish brown (10YR 5/2) silty clay, dark brown (10YR 3/3) moist; strong medium angular blocky structure; very hard, very firm, very sticky and very plastic; few very fine and fine roots; few very fine irregular pores; common distinct clay films on faces of peds and surfaces along pores; many prominent slickensides; neutral (pH 7.1)

R--89 cm; basalt

TYPE LOCATION: Clark County, Idaho; latitude 44.25377 degrees north, longitude 112.15941 degrees west, datum WGS 84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5.0 to 7.2 degrees C
Thickness of mollic epipedon--64 to 100 cm
Depth to argillic horizon--30 to 46 cm
Depth to bedrock--50 to 100 cm

Particle-size control section (weighted averages)
Total clay content--35 to 45 percent

A horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Clay content--18 to 22 percent
Reaction--pH 6.1 to 7.3
Thickness--5 to 15 cm

Bt horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Clay content--30 to 35 percent
Reaction--pH 6.1 to 7.3
Thickness-15 to 25 cm

Btss horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Texture (less than 2-mm fraction)--silty clay, silty clay loam
Clay content--35 to 45 percent
Reaction--pH 6.1 to 7.3
Thickness--30 to 60 cm

COMPETING SERIES:
Arva, Rugar, Schnipps--deep to paralithic contact
Broadhead, Henefer, Lostpepper--very deep
Bumpheads--more than 15 percent coarse fragments in particle-size control section
Cristo--moderately deep to paralithic contact; more than 15 percent coarse fragments in particle-size control section
Herberger--moderately deep to densic contact
Sweitberg--10 to 35 percent rock fragments in upper part of argillic horizon, more than 35 percent rock fragments in lower part of argillic horizon

GEOGRAPHIC SETTING:
Elevation--1,610 to 1,720 m
Mean annual precipitation--300 to 400 mm
Mean annual air temperature--3.9 to 6.1 degrees C
Frost-free period--70 to 120 days

GEOGRAPHICALLY ASSOCIATED SOILS: None listed

DRAINAGE AND PERMEABILITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--0.1 to 10.0 um/sec

USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--threetip sagebrush, bluebunch wheatgrass

DISTRIBUTION AND EXTENT: Small extent in southeast Idaho; MLRAs 11 and 13

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Clark County, Idaho; 2018

REMARKS:
Diagnostic horizons and other features recognized in this pedon
Mollic epipedon (pachic)--zone from the surface to a depth of 89 cm (A, Bt1, Bt2, Btss1, and Btss2 horizons)
Argillic horizon--zone from 10 to 89 cm (Bt1, Bt2, Btss1, and Btss2 horizons)
Particle-size control section--zone from 10 to 60 cm (Bt1 and Bt2 horizons, part of Btss1 horizon)

---

National Cooperative Soil Survey
U.S.A.