LOCATION WAYAN ID
Tentative Series
Rev. CBR-RJS
01/2015
WAYAN SERIES
The Wayan series consists of moderately deep, well drained soils that formed in loess influenced colluvium over residuum weathered from sedimentary rock. Wayan soils are on mountain slopes, swales and interfluves on mountain slopes. Slopes range from 2 to 50 percent. Mean annual precipitation is about 560 mm and the mean annual temperature is about 2.0 degrees C.
TAXONOMIC CLASS: Fine, smectitic Typic Argicryolls
TYPICAL PEDON: Wayan silt loam, on a north facing, 12 percent slope in sagebrush at an elevation of 2,040 meters. When described on July 8, 2011 the soil was dry from 0 to 12 cm and moist below. (Colors are for dry soil unless otherwise noted.)
A1--0 to 12 cm; brown (10YR 5/3) silt loam, dark brown (7.5YR 3/2) moist; moderate medium granular structure; soft, friable, nonsticky and nonplastic; common fine, very fine and medium roots; common very fine irregular and fine vesicular pores; slightly acid (pH 6.4); clear wavy boundary
A2--12 to 29 cm; yellowish brown (10YR 5/4) silt loam, dark brown (7.5YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine and few medium roots; common very fine vesicular and fine tubular pores; 1 percent gravel; slightly acid (pH 6.5); gradual wavy boundary. (Combined thickness of A horizons -- 25 to 31 cm)
Bt1--29 to 46 cm; yellowish brown (10YR 5/4) silt loam, dark yellowish brown (10YR 3/4) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine vesicular, and fine and medium tubular pores; 15 percent clay films on all faces of peds; 3 percent gravel; neutral (pH 6.6); clear wavy boundary. (12 to 49 cm thick)
Bt2--46 to 61 cm; 75 percent reddish brown (5YR 5/4) and 25 percent brown (7.5YR 5/4) clay, 50 percent reddish brown (5YR 4/3), 25 percent dark reddish brown (2.5YR 3/4) and 25 percent brown (7.5YR 5/3) moist; moderate medium subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine roots; common very fine vesicular and few very fine tubular pores; 25 percent clay films on all faces of peds; 1 percent fine manganese masses; 3 percent gravel; neutral (pH 6.6); gradual wavy boundary. (0 to 38 cm thick)
Bt3--61 to 80 cm; 80 percent light brownish gray (10YR 6/2) and 20 percent brown (7.5YR 5/3) clay, 80 percent grayish brown (10YR 5/2) and 20 percent brown (7.5YR 4/3) moist; moderate medium subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine roots; common very fine vesicular pores; 35 percent clay films on all faces of peds; 1 percent gravel; neutral (pH 6.6); gradual wavy boundary. (0 to 19 cm thick)
Cr--80 to 150 cm; paralithic bedrock
TYPE LOCATION: Bonneville County, Idaho; about 7 kilometers (4 miles) northeast of Herman, Idaho; located about 537 meters east and 656 meters north of the southwest corner of sec. 1, T. 3 S., R. 43 E.; Big Elk Mountain USGS quad; 43 degrees 11 minutes 6.1 seconds north latitude and 111 degrees 21 minutes 58.3 seconds west longitude, NAD 83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 1.7 to 3.9 degrees C
Some pedons have an O horizon, and where present, the mean annual summer soil temperature is 5.0 to 8.0 degrees C
Depth to paralithic contact: 50 to 100 cm
Depth to argillic horizon: 25 to 31 cm
Mollic epipedon thickness: 25 to 31 cm
Note: Some pedons may have a BC horizon.
Particle-size control section (weighted average): 36 to 46 percent clay
A1 horizon:
Hue: 5YR to 10YR; dry or moist
Chroma: 2 or 3; dry or moist
Clay content: 14 to 18 percent
Reaction: pH 6.4 to 7.2
A2 horizon:
Hue: 5YR to 10YR dry; 7.5YR or 5YR moist
Chroma: 2 to 4 dry; 2 or 3 moist
Texture: silt loam, loam
Clay content: 16 to 20 percent
Rock fragments: 0 to 5 percent gravel
Reaction: pH 6.5 to 7.2
Bt1 horizon:
Hue: 5YR to 10YR; moist
Value: 3 or 4 moist
Chroma: 2 to 4 moist
Texture: silt loam, silty clay loam, clay loam
Clay content: 23 to 38 percent
Rock fragments: 0 to 10 percent gravel
Reaction: pH 6.6 to 7.3
Bt2 and Bt3 horizon(s):
Hue: 5YR to 10YR dry; 2.5YR to 10YR moist
Value: 4 to 6 dry; 3 to 5 moist
Chroma: 2 to 4; dry or moist
Texture: clay, silty clay
Clay content: 40 to 52 percent
Rock fragments: 0 to 5 percent gravel
Reaction: pH 6.6 to 7.3
BC horizon (when present):
Value: 3 to 5 moist
Chroma: 2 to 4 moist
Texture: clay
Clay content: 40 to 46 percent
Rock fragments: 0 to 25 percent gravel or paragravel
Calcium carbonate equivalent: 0 to 5 percent
Reaction: pH 7.1 to 8.2
COMPETING SERIES:
Groomer(CO) - are very deep to a lithic or paralithic contact
GEOGRAPHIC SETTING:
Landform - mountain slopes, swales and interfluves on mountain slopes
Parent material - loess influenced colluvium over residuum weathered from sedimentary rock
Slopes - 2 to 50 percent
Elevation - 1,920 to 2,560 meters
Mean annual air temperature - 0.6 to 2.8 degrees C
Mean annual precipitation - 500 to 975 mm
Frost-free period - 30 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, moderately low saturated hydraulic conductivity.
USE AND VEGETATION: The major uses are wood products, watershed, wildlife habitat and some livestock grazing. The native plant community is subalpine fir with an understory of Rocky mountain maple and sweetcicily, or subalpine sagebrush and mountain brome.
DISTRIBUTION AND EXTENT: Wayan soils are of small extent in southeastern Idaho; MLRA 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Bonneville County, Idaho, Caribou National Forest soil survey area, 2015. The name Wayan is from a nearby community.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 29 cm (A1, A2 horizons)
Argillic horizon - 29 to 80 cm (Bt1, Bt2, Bt3 horizons)
Paralithic contact - 80 cm (Cr horizon)
Particle-size control section - 29 to 79 cm (Bt1, Bt2, part of Bt3 horizons)
Wayan soils have a cryic temperature regime and an udic moisture regime.
National Cooperative Soil Survey
U.S.A.