LOCATION SWINGSTATION WY
Tentative Series
Rev. KLS/DJP/RJS
04/2016
SWINGSTATION SERIES
The Swingstation series consists of very deep, well drained soils that formed in alluvium and/or slope alluvium derived from sedimentary rock. These soils are on hillslopes, fan aprons and drainageways. Slopes are 0 to 8 percent. Mean annual precipitation is about 275 mm, and mean annual air temperature is about 5.0 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Aridic Haplustalfs
TYPICAL PEDON: Swingstation loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 6 cm; brown (10YR 5/3) loam, brown (10YR 4/3), moist; weak fine granular structure; friable, slightly hard, slightly sticky, slightly plastic; many very fine and fine roots throughout; many fine interstitial pores; finely disseminated carbonate in matrix; strongly effervescent; moderately alkaline (pH 8.4); clear smooth boundary. (2 to 8 cm thick)
Btk--6 to 48 cm; light yellowish brown (10YR 6/4) clay loam, dark yellowish brown (10YR 4/4), moist; weak medium subangular blocky structure; firm, moderately hard, moderately sticky, moderately plastic; many fine and medium roots throughout; many fine tubular pores; 10 percent clay films on surfaces along root channels; 14 percent irregular carbonate masses in matrix; 5 percent paragravel; violently effervescent; moderately alkaline (pH 8.4); clear smooth boundary. (20 to 50 cm thick)
Btky--48 to 95 cm; yellowish brown (10YR 5/4) clay loam, brown (10YR 4/3), moist; weak medium subangular blocky structure; firm, moderately hard, moderately sticky, moderately plastic; common very fine roots throughout; many fine tubular pores; 10 percent clay films on all faces of peds; 10 percent irregular carbonate masses in matrix; and 10 percent irregular gypsum crystals in matrix; 10 percent paragravel; violently effervescent; moderately alkaline (pH 8.1); clear smooth boundary. (20 to 50 cm thick)
BCky--95 to 150 cm; brown (10YR 5/3) paragravelly clay loam, dark grayish brown (10YR 4/2), moist; massive; firm, moderately hard, moderately sticky, moderately plastic; few very fine roots throughout; common fine tubular pores; 5 percent irregular carbonate masses in matrix; 10 percent irregular gypsum crystals in matrix; 30 percent paragravel; strongly effervescent; moderately alkaline (pH 8.0).
TYPE LOCATION: Carbon County, Wyoming; USGS LaMarsh Creek West, Wyoming topographic quadrangle; 41 degrees 31 minutes 49.55 seconds north latitude and 107 degrees 5 minutes 3.54 seconds west longitude.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 4.9 to 7.1 degrees C.
Ochric epipedon thickness - 2 to 8 cm
Depth to argillic horizon - 2 to 8 cm
Depth to gypsic horizon - 22 to 52 cm
Depth to secondary carbonates - 2 to 8 cm
A horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 4 or 5 dry; 3 or 4 moist
Chroma: 2 or 3; dry or moist
Texture: fine sandy loam, loam
Clay content: 10 to 25 percent
Rock fragments: 0 to 15 percent gravel
Calcium carbonate equivalent: 2 to 10 percent
Reaction: pH 8.2 to 8.5
Btk horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 3 or 4; dry or moist
Texture: clay loam, loam, silty clay loam
Clay content: 25 to 35 percent
Parafragments: 0 to 15 percent paragravel
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 8.2 to 8.5
Btky horizon
Hue: 7.5YR to 2.5Y; dry or moist
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 to 4; dry or moist
Texture: clay loam, silty clay loam
Clay content: 27 to 35 percent
Parafragments: 0 to 25 percent paragravel
Calcium carbonate equivalent: 5 to 15 percent
Gypsum content: 5 to 15 percent
Reaction: pH 7.8 to 8.2
BCky horizon
Hue: 10YR to 2.5Y; dry or moist
Value: 4 or 5 dry; 3 or 4 moist
Chroma: 2 to 4; dry or moist
Texture: clay loam, silty clay loam
Clay content: 27 to 35 percent
Parafragments: 15 to 40 percent paragravel
Calcium carbonate equivalent: 2 to 10 percent
Gypsum content: 5 to 15 percent
Reaction: pH 7.8 to 8.2
COMPETING SERIES:
Bluemod (WY) - are moderately deep to paralithic bedrock
Bondoe (MT) - does not have a gypsic horizon
Bonfri (MT) - are moderately deep to paralithic bedrock
Bonhigh (WY) - are moderately deep to paralithic bedrock
Chinatown (MT) - are moderately deep to lithic bedrock
Fattig (MT) - are moderately deep to lithic bedrock
Ferball (MT) - does not have a gypsic horizon
Foreleft (MT) - have a frost-free period greater than 100 days
Foreright (WY) - does not have gypsic horizon
Foresand (WY) - does not have gypsic horizon
Forsees (WY) - does not have gypsic horizon
Jewel (WY) - are deep to paralithic bedrock
Mountairy (MT) - have hues of 5Y or yellower in the substratum
Overlandtrail (MT) - have a lithologic discontinuity
Raghigh (WY) - does not have gypsic horizon
Raghorn (MT) - does not have secondary carbonate accumulations
Zagplat (WY) - are deep to paralithic bedrock
GEOGRAPHIC SETTING:
Landform - hillslopes, fan aprons and drainageways
Elevation - 2,000 to 2,400 meters
Slope - 0 to 8 percent
Parent material - alluvium and/or slope alluvium derived from sedimentary rock
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 225 to 300 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature - 3.9 to 6.1 degrees C.
Frost-free period - 50 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, Ksat 1.5-5.0 um/sec.
USE AND VEGETATION: Swingstation soils are primarily used for rangeland. The potential native vegetation is Wyoming big sagebrush, birdfoot sagebrush, black greasewood, shadscale saltbush, Gardner saltbush, green rabbitbrush, spiny phlox, needleleaf sedge, Indian ricegrass, Letterman needlegrass, shrubby buckwheat, and prickly pear.
DISTRIBUTION AND EXTENT: Swingstation soils are of small extent in southwestern Wyoming. MLRA 34A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Carbon County, Wyoming, 2015. The series name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 6 cm (A horizon)
Argillic horizon - 6 to 95 cm (Btk, Btky horizons)
Secondary carbonates - 6 to 150 cm (Btk, Btky, BCky horizons)
Gypsic horizon - 48 to 150 cm (Btky, BCky horizons)
Particle-size control section - 6 to 56 cm (Btk, part of Btky horizons)
Swingstation soils have a frigid temperature regime and an ustic moisture regime bordering on aridic.
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National Cooperative Soil Survey
U.S.A.