LOCATION YODAL WYEstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, active Typic Palecryalfs
TYPICAL PEDON: Yodal gravelly loam, on a 35 percent slope with an east aspect at 9100 feet elevation, in a subalpine forb community. (Colors are for dry soil unless otherwise noted.)
A--0 to 3 inches; brown (7.5YR 5/3) gravelly loam, dark brown (7.5YR 3/3) moist; weak coarse subangular blocky structure parting to moderate medium granular; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many very fine vesicular pores; 30 percent pebbles; slightly acid (pH 6.5); clear smooth boundary. (3 to 7 inches thick)
AE--3 to 17 inches; brown (7.5YR 5/3) gravelly loam, brown (7.5YR 4/3) moist; weak coarse subangular blocky structure parting to weak medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common fine roots, few medium and coarse roots; common fine and medium tubular pores; 20 percent pebbles; strongly acid (pH 5.5); clear smooth boundary. (10 to 20 inches thick)
E--17 to 38 inches; light brown (7.5YR 6/4) gravelly loam, brown (7.5YR 4/4) moist; weak coarse subangular blocky structure parting to moderate medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; few fine and medium roots; common fine and medium tubular pores; common uncoated silt grains on ped faces; 20 percent pebbles and 5 percent cobbles; strongly acid (pH 5.5); clear smooth boundary. (10 to 30 inches thick)
E/B--38 to 55 inches; 95 percent reddish yellow (5YR 6/6) E material, yellowish red (5YR 4/6) moist, 5 percent light red (2.5YR 6/6) B material as irregular masses and lamellae, red (2.5YR 5/6) moist that mix to very gravelly very fine sandy loam; massive; hard, friable, slightly sticky and slightly plastic; few fine roots; few medium tubular pores; 30 percent pebbles and 20 percent cobbles; strongly acid (pH 5.1); clear wavy boundary. (17 to 30 inches thick)
Bt/E--55 to 70 inches; 90 percent red (2.5YR 5/8) B material, red (2.5YR 4/8) moist, 10 percent white (10YR 8/1) E material as skeletans less than 1 cm thick on ped faces, light gray (10YR 7/2) moist that mix to silty clay; moderate coarse prismatic structure parting to moderate coarse subangular blocky; very hard, firm, sticky and very plastic; few very fine and fine roots; many very fine tubular pores, few fine and medium tubular pores; common faint clay films on faces of peds and lining pores; 5 percent pebbles; strongly acid (pH 5.2).
TYPE LOCATION: Teton County, Wyoming; about 9 miles west of Jackson; about 500 feet east and 400 feet north of the southwest corner of section 15, T. 41 N., R. 118 W.; Latitude - 43 degrees North, 57 minutes, 37 seconds; Longitude - 111 degrees West, 57 minutes, 37 seconds.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 33 to 36 degrees F.
Mean summer soil temperature - 41 to 44 degrees F.
Moisture control section - between 4 and 12 inches; dry throughout the moisture control section for 15 to 30 consecutive days during the four months following the summer solstice.
Depth to argillic horizon - 40 to greater than 60 inches.
Color after mixing the upper 7 inches - value greater than 5 dry or 3 moist or chroma greater than 3.
Clay content in particle-size control section - averages 18 to 27 percent.
Rock fragments in particle-size control section - averages 15 to 35 percent.
A horizon - Hue: 5YR, 7.5YR or 10YR
Value: 4, 5 or 6 dry; 3 or 4 moist
Chroma: 2, 3 or 4 dry or moist
Clay content: 12 to 22 percent
Rock fragments: 15 to 35 percent--10 to 35 percent pebbles; 0 to 5 percent cobbles; 0 to 5 percent stones
Reaction: pH 5.6 to 6.5
AE horizon - Hue: 5YR, 7.5YR or 10YR
Value: 4, 5 or 6 dry; 3 or 4 moist
Chroma: 2, 3 or 4 dry; 3 or 4 moist
Texture: silt loam or loam
Clay content: 15 to 25 percent
Rock fragments: 5 to 35 percent--5 to 30 percent pebbles; 0 to 5 percent cobbles; 0 to 5 percent stones
Reaction: pH 5.1 to 6.5
E horizon - Hue: 5YR, 7.5YR or 10YR
Value: 4, 5 or 6 dry; 3, 4 or 5 moist
Chroma: 2, 3 or 4 dry; 3 or 4 moist
Texture: loam or silt loam
Clay content: 18 to 27 percent
Rock fragments: 15 to 35 percent--5 to 30 percent pebbles; 0 to 20 percent cobbles; 0 to 10 percent stones
Reaction: pH 5.1 to 7.3
E/B horizon - Hue: 2.5YR, 5YR, 7.5YR or 10YR
Value, mixed: 5, 6 or 7 dry; 4, 5 or 6 moist
Chroma, mixed: 3, 4, or 6 dry or moist
Texture: very fine sandy loam or loam
Clay content: 15 to 25 percent
Rock fragments: 35 to 60 percent--10 to 40 percent pebbles; 5 to 30 percent cobbles; 0 to 10 percent stones
Reaction: pH 5.1 to 7.3
Volume of B material: less than 15 percent
Bt/E horizon - Hue: 2.5YR, 5YR, 7.5YR, 10YR or 5Y
Value, B part - 5 or 6 dry, 4 or 5 moist
E part - 7 or 8 dry, 6 or 7 moist
Chroma, B part - 6 or 8 dry or moist
E part - 1 or 2 dry or moist
Texture: silty clay or clay
Clay content: 40 to 60 percent
Rock fragments: 5 to 35 percent--0 to 15 percent pebbles; 0 to 20 percent cobbles; 0 to 10 percent stones
Soft shale or sandstone fragments: 0 to 40 percent
Reaction: pH 5.1 to 7.3
Volume of E material: less than 15 percent
COMPETING SERIES: This is the Swifton series. Swifton soils have a mean annual soil temperature of 44 to 46 degrees F.
GEOGRAPHIC SETTING:
Landform - mountain summits, sideslopes and basins above the
forested zone.
Elevation - 7,600 to 9,800 feet.
Slope - 4 to 60 percent.
Parent material - local alluvium or colluvium derived from mixed sedimentary bedrock and loess.
Climate - Precipitation is evenly distributed throughout the year. Winter snowpack of 8 to 16 feet in depth and lasting through mid June are common.
Mean annual temperature - 26 to 34 degrees F.
Mean annual precipitation - 30 to 60 inches.
Frost free period - 5 to 30 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fritz and Koffgo series and soils in the fragmental family of Typic Cryochrepts. Fritz soils are on nearby alpine mountain summits. They are derived from limestone and have mollic epipedons over calcic horizons. Koffgo soils are on nearby mountain sideslopes and commonly support forested communities. They average greater than 35 percent rock fragments throughout the particle size control section. The fragmental Typic Cryochrepts are on nearby karst alpine mountain summits. They are derived from limestone and are less than 20 inches deep to fragmental material.
DRAINAGE AND PERMEABILITY: Well drained; moderate to rapid runoff; moderate permeability.
USE AND VEGETATION: Yodal soils are used for livestock grazing, recreation, and wildlife habitat. These soils commonly support subalpine forb communities. The fernleaf licorieroot-duncecap larkspur c.t., nettleleaf giant hyssop-showy goldeneye c.t. are commonly represented.
DISTRIBUTION AND EXTENT: Western Wyoming and southeastern Idaho. They are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Targhee National Forest, Teton County, Wyoming, 1997.
REMARKS:
Diagnostic horizons and features recognize in this pedon are:
Ochric epipedon - The zone from the mineral soil surface to 55 inches (A, AE, E and E/B horizons).
Argillic horizon - The zone from 55 to 70 inches (Bt/E horizon).
Particle size control section - The zone from 10 to 40 inches (part of the AE, E, and part of the E/B horizons).
Interfingering of albic material into the argillic horizon - The zone from 55 to 70 inches (Bt/E horizon).
20 percent or greater absolute clay increase - The horizon boundary at 55 inches (transition from the E/B to B/E horizons)
Udic moisture regime
ADDITIONAL DATA: Full Characterization Data (06/27/89) NSSL, Lincoln, NE. Client-Assigned Laboratory Number S88WY-039-001; Project File Numbers 88P 148; Laboratory-Assigned Numbers: Pedon 88P 837, Samples 88P4378-4383.