LOCATION CHIPPY ID
Tentative Series
Proposed CBR-NHK-RJS
01/2017
CHIPPY SERIES
The Chippy series consists of very deep, well drained soils that formed in loess influenced slope alluvium and alluvium derived from non-calcareous sedimentary rock. Chippy soils are on hillslopes and fan remnants. Slopes range from 2 to 16 percent. Mean annual precipitation is about 650 millimeters, and mean annual air temperature is about 1.7 degrees C.
TAXONOMIC CLASS: Fine-Loamy, mixed, superactive Xeric Argicryolls
TYPICAL PEDON: Chippy loam, on an east-facing, 4 percent slope in sagebrush at an elevation of 2,021 meters. When described on October 27, 2015, the soil was moist in the upper part and dry in the lower part. (Colors are for dry soil unless otherwise noted.)
A1--0 to 8 cm; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine, and common fine and medium roots; many very fine and common fine irregular pores; 2 percent gravel; slightly acid (pH 6.4); clear smooth boundary.
A2--8 to 19 cm; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine, and common fine and medium roots; common very fine and fine irregular pores; 5 percent gravel; slightly acid (pH 6.4); clear wavy boundary.
AB--19 to 39 cm; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; moderately hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots; common very fine and fine tubular pores; 5 percent gravel; slightly acid (pH 6.2); gradual wavy boundary. (0 to 26 cm thick)
Bt1--39 to 77 cm; light brown (7.5YR 6/3) loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common fine and few medium roots; common very fine and fine tubular pores; 25 percent distinct clay films on all faces of peds and 5 percent distinct clay films on surfaces along pores; 20 percent silt coats on all faces of peds; 5 percent gravel; slightly acid (pH 6.2); clear wavy boundary.
Bt2--77 to 89 cm; light brown (7.5YR 6/4) loam, brown (7.5YR 4/4) moist; moderate coarse subangular blocky structure; moderately hard, firm, moderately sticky and slightly plastic; few very fine, fine and medium roots; many very fine and common fine tubular pores; 10 percent prominent clay films on all faces of peds and 30 percent prominent clay films on surfaces along pores; 15 percent silt coats on all faces of peds; 10 percent gravel; slightly acid (pH 6.2); gradual wavy boundary.
Bt3--89 to 132 cm; yellowish brown (10YR 5/4) very gravelly clay loam, dark reddish brown (5YR 3/3) moist; moderate coarse subangular blocky structure; hard, firm, very sticky and moderately plastic; few very fine roots; common very fine and fine tubular pores; 20 percent prominent clay films on all faces of peds, 5 percent prominent clay films on surfaces along pores, 50 percent distinct clay bridges between sand grains and 5 percent prominent clay films on rock fragments; 45 percent gravel; slightly acid (pH 6.3); clear wavy boundary.
Bt4--132 to 150 cm; light yellowish brown (10YR 6/4) gravelly loam, dark yellowish brown (10YR 4/6) moist; weak very coarse subangular blocky structure; hard, very friable, moderately sticky and slightly plastic; common fine tubular pores; 10 percent faint clay films on all faces of peds and 5 percent faint clay films on surfaces along pores; 5 percent yellowish brown (10YR 5/6) moist, concretions (Fe and Mn oxides) lining pores; 25 percent gravel; slightly acid (pH 6.4).
TYPE LOCATION: Caribou County, Idaho; about 11 kilometers southeast of Wayan, ID; located about 80 meters south and 350 meters west of the northeast corner of sec. 20, T. 6 S., R. 44 E.; Wayan East USGS quad; 42 degrees 53 minutes 20.6 seconds north latitude and 111 degrees 19 minutes 7.2 seconds west longitude, WGS 84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature -- 1.7 to 3.9 degrees C
Thickness of the mollic epipedon -- 25 to 39 cm
Depth to argillic horizon -- 25 to 50 cm
Particle-size control section (weighted averages)*
*clay content -- 18 to 27 percent
*rock fragments -- 2 to 25 percent
A1, A2 horizons
Hue: 7.5YR or 10YR dry or moist
Value: 3 to 5 dry; 2 or 3 moist
Chroma: 2 or 3 dry or moist
Clay content: 10 to 17 percent
Rock fragments: 1 to 5 percent gravel
Reaction: pH 5.6 to 6.5
Thickness: 8 to 25 cm (combined thickness of A1, A2 horizons)
AB horizon
Hue: 7.5YR or 10YR dry or moist
Value: 3 to 5 dry; 2 or 3 moist
Chroma: 2 or 3 dry or moist
Texture: silt loam or loam
Clay content: 12 to 17 percent
Rock fragments: 0 to 10 percent gravel
Reaction: pH 5.6 to 6.4
Thickness: 0 to 26 cm
Bt1, Bt2 horizons
Hue: 7.5YR or 10YR dry or moist
Value: 5 or 6 dry; 3 or 4 moist
Chroma: 3 or 4 dry or moist
Texture: silt loam or loam
Clay content: 18 to 27 percent
Rock fragments: 2 to 14 percent gravel
Reaction: pH 5.6 to 6.4
Thickness: 30 to 55 cm (combined thickness of Bt1, Bt2 horizons)
Bt3 and Bt4 horizons
Hue: 5YR to 10YR dry or moist
Value: 5 or 6 dry; 3 or 4 moist
Chroma: 3 to 6 dry or moist
Texture: loam, clay loam
Clay content: 24 to 34 percent
Rock fragments: 20 to 50 percent--20 to 50 percent gravel; 0 to 15 percent cobbles
Reaction: pH 5.6 to 6.5
Thickness: greater than 45 cm (combined thickness of Bt3, Bt4 horizons)
COMPETING SERIES:
Grunder (ID) -- are moderately deep to lithic contact
Newlands (CA) -- are deep to lithic contact
Primeaux (NV) -- are moderately deep to lithic contact
Rammel (ID) -- are moderately deep to lithic contact
Shotgun (ID) -- are moderately deep to lithic contact
Tingey (UT) -- have an accumulation of calcium carbonate within a depth of 100 cm
GEOGRAPHIC SETTING:
Landform -- hillslopes and fan remnants
Parent material -- loess influenced slope alluvium and alluvium derived from non-calcareous sedimentary rock
Slopes -- 2 to 16 percent
Elevation -- 1,890 to 2,130 meters
Mean annual precipitation -- 600 to 725 millimeters
Mean annual air temperature -- 0.6 to 2.8 degrees C
Frost-free period -- 30 to 65 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained and 1 to 10 um/sec.
USE AND VEGETATION: The major uses are wildlife habitat, pasture and livestock grazing. The native plant community is mainly mountain big sagebrush, mountain brome, and Idaho fescue.
DISTRIBUTION AND EXTENT: Chippy soils are of small extent in southeastern Idaho; MLRA 43B.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Caribou County, Idaho, Caribou County Area, Idaho Soil Survey, 2017. The name Chippy is from a nearby stream.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 39 cm (A1, A2, AB horizons)
Argillic horizon: 39 to greater than 150 cm (Bt1, Bt2, Bt3, Bt4 horizons)
Particle-size control section: 39 to 89 cm (Bt1, Bt2 horizons).
Chippy soils have a cryic temperature regime and a xeric moisture regime bordering on udic.
National Cooperative Soil Survey
U.S.A.