LOCATION SEMINOE WY
Tentative Series
KLS-ALB-DEW
04/2025
SEMINOE SERIES
Depth class: Very deep
Drainage class: Well drained
Saturated hydraulic conductivity class: High
Parent Material: Slope alluvium derived from sandstone and shale
Geomorphic location: Hillslopes, cuestas, dip slopes, scarp slopes, interdunes, and interfluves.
Slope range: 0 to 15 percent
Mean annual air temperature: 5 degrees C (41 degrees F)
Mean annual precipitation: 255 millimeters (10 inches)
TAXONOMIC CLASS:
Fine-loamy, mixed, superactive, frigid Aridic Haplustalfs
TYPICAL PEDON: Seminoe sandy loam, in rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 7 centimeters; dark yellowish brown (10YR 4/4) sandy loam, dark yellowish brown (10YR 3/4) moist; weak fine granular structure; soft, very friable, nonsticky, nonplastic; common fine and many very fine roots throughout; common fine interstitial pores; 13 percent gravel; neutral (pH 7.0); clear smooth boundary.
Bt--7 to 16 centimeters; dark yellowish brown (10YR 4/6) sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; very hard, extremely firm, moderately sticky, moderately plastic; common very fine, fine and medium roots throughout; common very fine, fine, and medium tubular pores; 10 percent clay films on all faces of peds; 5 percent gravel; neutral (pH 7.2); gradual smooth boundary.
Btk--16 to 30 centimeters; light olive brown (2.5Y 5/4) sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; common very fine and fine roots throughout; common very fine and fine tubular pores; 5 percent clay films on all faces of peds; 5 percent threadlike calcium carbonate masses in matrix and 4 percent calcium carbonate concretions on bottom of rock fragments; 5 percent gravel; strongly effervescent; moderately alkaline (pH 8.0); gradual smooth boundary.
Btkn--30 to 72 centimeters; light olive brown (2.5Y 5/4) loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; common very fine and fine roots throughout; common very fine and fine tubular pores; 3 percent clay films on all faces of peds; 10 percent calcium carbonate masses in matrix and 3 percent calcium carbonate concretions on bottom of rock fragments; 5 percent gravel; violently effervescent; strongly alkaline (pH 8.8); gradual smooth boundary.
BCk--72 to 150 centimeters; light yellowish brown (2.5Y 6/4) sandy loam, light olive brown (2.5Y 5/4) moist; single grain; loose, nonsticky, slightly plastic; common fine roots throughout; common fine interstitial pores; 2 percent calcium carbonate masses in matrix; 5 percent gravel; slightly effervescent; moderately alkaline (pH 8.4).
TYPE LOCATION:
Carbon County, WY
USGS Quadrangle: Pats Bottom
Latitude: 41.9082139
Longitude: -106.8597472
Datum: WGS84
Coordinate source: Hand-help GPS
RANGE IN CHARACTERISTICS:
Depth to argillic horizon: 5 to 8 centimeters
Depth to secondary calcium carbonates: 5 to 20 centimeters
Particle-size control section (weighted averages):
Clay content-20 to 34 percent
Sand content-35 to 65 percent
Total rock fragments-0 to 14 percent
A horizon
Hue-10YR or 2.5Y
Value-4 to 6 dry; 3 to 4 moist
Chroma-2 to 4
Texture (less than 2millimeters)-Sandy loam, loamy sand, loam, or fine sandy loam
Clay content-5 to 19 percent
Rock Fragments-0 to 13 percent gravel
Reaction-pH 6.6 to 8.4
Thickness-5 to 8 centimeters
Bt horizon (when present)
Hue-10YR
Value-4
Chroma-6 dry; 4 moist
Texture (less than 2millimeters)-Loam, sandy clay loam, or clay loam
Clay content-22 to 35 percent
Rock Fragments-0 to 14 percent gravel
Calcium carbonate equivalent-0 to 3 percent
Sodium adsorption ratio-0 to 3
Reaction-pH 6.6 to 8.4
Thickness-0 to 11 centimeters
Btk horizon(s)
Hue-10YR or 2.5Y
Value-5 or 6 dry; 4 or 5 moist
Chroma-3 or 4
Texture (less than 2millimeters)-Loam, sandy clay loam, or clay loam
Clay content-20 to 35 percent
Rock Fragments-0 to 14 percent gravel
Calcium carbonate equivalent-5 to 15 percent
Sodium adsorption ratio-0 to 3
Electrical conductivity-2 to 4 dS/m
Reaction-pH 7.8 to 8.4
Thickness-16 to 60 centimeters
Btkn/Btky/Btkz horizon(s) (when present)
Hue-2.5Y dry; 2.5Y or 10YR moist
Value-5 or 6 dry; 4 moist
Chroma-3 or 4
Texture (less than 2millimeters)-Loam, sandy clay loam, or clay loam
Clay content-20 to 35 percent
Rock fragments-0 to 14 percent gravel
Calcium carbonate equivalent-5 to 15 percent
Sodium adsorption ratio-3 to 13
Electrical conductivity-2 to 8 dS/m
Gypsum-0 to 5 percent
Reaction-pH 8.0 to 9.2
Thickness-0 to 70 centimeters
Bk/Bkn/BCk/BCky horizon(s) (when present)
Hue-2.5Y
Value-5 or 6 dry; 4 or 5 moist
Chroma-3 or 4
Texture (less than 2millimeters)-Sandy loam or sandy clay loam
Clay content-10 to 30 percent
Rock fragments-2 to 25 percent gravel
Calcium carbonate equivalent-3 to 15 percent
Sodium adsorption ratio-0 to 13
Electrical conductivity-4 to 8 dS/m
Gypsum-0 to 5 percent
Reaction-pH 8.2 to 9.0
Thickness-0 to 100 centimeters
C horizon (when present)
Hue-2.5Y or 10YR
Value-3 or 5 dry; 2.5 or 5 moist
Chroma-1 or 8
Texture (less than 2millimeters)-Sandy loam, loamy sand, or silty clay
Clay content-10 to 52 percent
Rock fragments-0 to 20 percent; 0 to 20 percent gravels, 0 to 20 percent paragravels
Calcium carbonate equivalent-0 to 15 percent
Sodium adsorption ratio-0 to 13
Electrical conductivity-0 to 8 dS/m
Gypsum-0 to 5
Reaction-pH 7.0 to 8.6
Thickness-0 to 50 centimeters
COMPETING SERIES:
Bluemod (WY) - moderately deep to paralithic contact
Bondoe (MT) - has channery textural modifiers throughout
Bonfri (MT) - moderately deep to paralithic contact
Bonhigh (MT) - moderately deep to paralithic contact
Chinatown (MT) - moderately deep to lithic contact
Fattig (MT) - moderately deep to paralithic contact
Ferball (MT) - has hues of 7.5YR or redder in the substratum
Foreleft (MT) - frost free period does not range below 105 days
Foreright (WY) -identifiable secondary calcium carbonates occur at depth greater than 20 centimeters
Jewel (WY) - deep to paralithic contact
Mckaylake (WY) - has gypsum accumulation
Mountairy (MT) - has gypsum accumulation
Overlandtrail - has a lithologic discontinuity
Raghigh (WY) - does not have secondary carbonate accumulations
Raghorn (MT) - does not have secondary calcium carbonate accumulations
Swingstation (WY) - has a gypsic horizon. Does not have elevated sodium
Toothaker (WY) - is moderately deep to paralithic contact
Zagplat (WY) - deep to paralithic contact
GEOGRAPHIC SETTING:
Parent material: Slope alluvium derived from sandstone and shale
Landform: Hillslopes, cuestas, dip slopes, scarp slopes, interdunes, and interfluves
Slope: 0 to 15 percent
Mean annual air temperature: 4.0 to 6.0 degrees C (39.2 to 42.8 degrees F)
Mean annual precipitation: 230 to 305 millimeters (9 to 12 inches)
Frost-free period: 50 to 100 days
Elevation: 1,950 to 2,160 meters (6,332 to 7,218 feet)
Climate: Long, cold winters; cool, moist springs; short, cool summers
GEOGRAPHICALLY ASSOCIATED SOILS:
None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Well drained
Saturated hydraulic conductivity: 0.5 to 5 um/sec.
USE AND VEGETATION:
Seminoe soils are primarily used for rangeland. The potential native vegetation is Indian rice grass, western wheatgrass, Wyoming big sagebrush, threadleaf sedge, bottlebrush squirreltail, thickspike wheatgrass, needle and thread, mutton grass, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT:
Seminoe soils are of moderate extent in south-central Wyoming; MLRA 34A.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Carbon County, Wyoming, 2017. The series name is derived from a local landmark.
REMARKS:
Typical Pedon Taxonomic Features:
Ochric epipedon-0 to 7 centimeters (A horizons)
Argillic horizon-7 to 72 centimeters (Bt, Btk, and Btkn horizons)
Identifiable secondary calcium carbonates-16 to 150 centimeters (Btk, Btkn, and BCk horizons)
Particle-size control section-7 to 57 centimeters (Bt, Btk, and part of the Btkn horizons)
Taxonomic Version: Keys to Soil Taxonomy, 13th edition, (2022)
National Cooperative Soil Survey
U.S.A.