LOCATION BEAVMID WY
Tentative Series
Rev. TAG-DMM-RJS
04/2011
BEAVMID SERIES
The Beavmid series consists of very deep, well drained soils that formed in alluvium derived metamorphic and sedimentary rock. These soils are on fan remnants and outwash terraces. Slopes are 1 to 6 percent. Mean annual precipitation is about 430 mm and mean annual air temperature is about 1 degree C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Ustic Argicryolls
TYPICAL PEDON: Beavmid loam, in rangeland (colors are for dry soil unless otherwise noted).
A1--0 to 9 cm; dark brown (10YR 3/3) loam, very dark brown (10YR 2/2) moist; weak fine and medium granular structure; moderately hard, firm, slightly sticky, slightly plastic; many very fine and fine, and common medium and coarse roots; many fine interstitial pores; 5 percent gravel; slightly alkaline (pH 7.4); clear smooth boundary.
A2--9 to 32 cm; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; many very fine and fine, and common medium and coarse roots; many fine interstitial pores; 5 percent gravel; slightly alkaline (pH 7.4); clear smooth boundary. (combined thickness of A horizons - 18 to 40 cm)
BA--32 to 44 cm; brown (10YR 5/3) loam, brown (10YR 4/3) moist; moderate fine and medium subangular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; many very fine and fine, common medium, and few coarse roots; many fine tubular pores; 5 percent gravel; slightly alkaline (pH 7.4); gradual wavy boundary. (0 to 15 cm thick)
Bt1--44 to 80 cm; brown (7.5YR 5/4) clay loam, brown (7.5YR 4/4) moist; moderate medium and coarse subangular blocky structure; hard, very firm, moderately sticky, moderately plastic; many very fine and fine, common medium, and few coarse roots; many fine tubular pores; 20 percent distinct clay films on all faces of peds; 5 percent gravel; slightly alkaline (pH 7.4); gradual wavy boundary.
Bt2--80 to 114 cm; brown (7.5YR 5/4) cobbly clay loam, brown (7.5YR 4/4) moist; moderate medium and coarse subangular blocky structure; hard, very firm, moderately sticky, moderately plastic; common very fine, fine and medium, and few coarse roots; many fine interstitial pores; 20 percent distinct clay films on all faces of peds; 9 percent gravel, 9 percent cobbles; slightly alkaline (pH 7.4); clear wavy boundary. (combined thickness of Bt1 and Bt2 horizons - 50 to 80 cm)
Bt3--114 to 180 cm; yellowish brown (10YR 5/6) very gravelly sandy clay loam, dark yellowish brown (10YR 4/6) moist; moderate fine and medium subangular blocky structure; hard, very firm, moderately sticky, moderately plastic; common very fine, fine and medium, and few coarse roots; many fine interstitial pores; 10 percent distinct clay films on all faces of peds; 30 percent gravel, 10 percent cobbles; slightly alkaline (pH 7.4); clear wavy boundary. (50 to 80 cm thick)
C--180 to 200 cm; brown (10YR 5/3) very gravelly sandy loam, brown (10YR 4/3) moist; massive; moderately hard, firm, slightly sticky, slightly plastic; common very fine, fine and medium, and few coarse roots; many fine interstitial pores; 40 percent gravel, 15 percent cobbles; neutral (pH 7.3).
TYPE LOCATION: Sublette County, Wyoming; located approximately 973 feet north and 1,617 feet east of the southwest corner of section 26, T 36N, R 113W; USGS Kismet Peak, Wyoming topographic quadrangle; 43 degrees 3 minutes 57.00 seconds north latitude and 110 degrees 18 minutes 2.00 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil temperature - 1.5 to 4.0 degrees C.
Mollic epipedon thickness - 25 to 40 cm.
Depth to argillic horizon - 25 to 50 cm.
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: 15 to 22 percent
Rock Fragments: 0 to 10 percent gravel
Reaction: pH 6.8 to 7.5
BA 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
Clay content: 15 to 22 percent
Rock Fragments: 0 to 15 percent gravel
Reaction: pH 6.8 to 7.5
Bt1, Bt2 horizons
Hue: 7.5YR or 10YR; dry or moist
Value: 4 or 5; dry or moist
Chroma: 3 to 6; dry or moist
Texture: sandy clay loam, clay loam
Clay content: 25 to 35 percent
Rock Fragments: 0 to 30 percent--0 to 20 percent gravel; 0 to 15 percent cobbles
Reaction: pH 6.8 to 7.5
Bt3 horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 4 or 5; dry or moist
Chroma: 4 or 6; dry or moist
Texture: clay loam, sandy clay loam
Clay content: 25 to 35 percent
Rock Fragments: 35 to 60 percent--25 to 45 percent gravel; 5 to 15 percent cobbles, 0 to 5 percent stones
Reaction: pH 6.8 to 7.5
C horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 4 or 5; dry or moist
Chroma: 3 or 4; dry or moist
Clay content: 8 to 15 percent
Rock Fragments: 40 to 65 percent--30 to 55 percent gravel, 10 to 20 percent cobbles, 0 to 5 percent stones
Reaction: pH 6.6 to 7.3
COMPETING SERIES:
Amsden (WY) - have secondary calcium carbonate accumulation
Barbarela (MT) - is moderately deep to a paralithic contact
Beaveridge (WY) - have a lithologic discontinuity
Cific (WY) - is moderately deep to a paralithic contact
Coldspring (CO) - is deep to a lithic contact
Croftshaw (NM) - have a lithologic discontinuity
Dewville (CO) - have secondary calcium carbonate accumulation
Gelkie (CO) - have secondary calcium carbonate accumulation
Highrye (MT) - is deep to a paralithic contact
Hooligan (MT) - is moderately deep to a paralithic contact
Inchau (WY) - is moderately deep to a paralithic contact
Kezar (CO) - is moderately deep to a lithic contact
Leavitt (WY) - have secondary calcium carbonate accumulation
Lucky (CO) - is moderately deep to a lithic contact
Lymanson (WY) - is moderately deep to a paralithic contact
Miracle (CO) - is moderately deep to a lithic contact
Monaberg (MT) - have rock fragments that average less than 35 percent in the lower part of the profile
Passcreek (WY) - is moderately deep to a lithic contact
Rainbolt (WY) - is moderately deep to a paralithic contact
Tripit (WY) - is moderately deep to a paralithic contact
Wellsville (CO) - have secondary calcium carbonate accumulation
Woosley (WY) - is moderately deep to a lithic contact
Youga (CO) - have rock fragments that average less than 35 percent in the lower part of the profile
Zade (MT) - is moderately deep to a paralithic contact
GEOGRAPHIC SETTING:
Landform - fan remnants, outwash terraces
Elevation - 2285 to 2500 meters
Slope - 1 to 6 percent
Parent material - alluvium derived from metamorphic and sedimentary rock
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 380 to 485 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature - 0.5 to 3.0 degrees C.
Frost-free period - 25 to 45 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Beavmid soils are primarily used for rangeland. The potential native vegetation is mainly mountain big sagebrush, Letterman's needlegrass, Columbia needlegrass, snowberry, and Idaho fescue.
DISTRIBUTION AND EXTENT: Beavmid soils are of small extent in southwestern Wyoming, MLRA - 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES PROPOSED: Sublette County, Wyoming, 2011. The series name is coined from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 32 cm inches (A1, A2 horizons)
Argillic horizon: 44 to 180 inches (Bt1, Bt2, Bt3 horizons)
Particle-size control section - from 44 to 94 cm (Bt1, part of Bt2 horizons).
Beavmid soils have a cryic temperature regime and an ustic moisture regime.
Taxonomic version: Eleventh Edition, 2010.
National Cooperative Soil Survey
U.S.A.