LOCATION BEAVET WY
Tentative Series
Rev. TAG-DMM-RJS
04/2011
BEAVET SERIES
The Beavet series consists of very deep, somewhat poorly drained soils that formed in alluvium derived from metamorphic and sedimentary rock. These soils are on fan remnants and stream terraces. Slopes are 0 to 3 percent. Mean annual precipitation is 430 mm and mean annual air temperature is about 1 degree C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Oxyaquic Argicryolls
TYPICAL PEDON: Beavet loam, in irrigated pastureland (colors are for dry soil unless otherwise noted).
A1--0 to 13 cm; dark brown (10YR 3/3) loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; many fine and common medium roots; many fine interstitial pores; 5 percent gravel; neutral (pH 7.2); gradual wavy boundary.
A2--13 to 37 cm; dark brown (10YR 3/3) loam, very dark brown (10YR 2/2) moist; moderate fine and medium granular structure; slightly hard, friable, slightly sticky, slightly plastic; many fine and common medium roots; many fine interstitial pores; 5 percent gravel; slightly alkaline (pH 7.4); clear wavy boundary. (combined thickness of A horizons - 20 to 45 cm)
Bt--37 to 65 cm; brown (10YR 4/3) clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky, moderately plastic; common fine and medium roots; many fine tubular pores; 20 percent distinct clay films on all faces of peds; 10 percent gravel; slightly alkaline (pH 7.6); clear wavy boundary. (20 to 40 cm thick)
Btk--65 to 90 cm; yellowish brown (10YR 5/6) gravelly clay loam, dark yellowish brown (10YR 4/6) moist; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky, moderately plastic; common fine roots; many fine tubular pores; 5 percent faint clay films on all faces of peds and 40 percent carbonate coats on rock fragments; 2 percent distinct fine masses of yellowish red (5YR 5/6) oxidized iron redox concentrations in matrix; 5 percent carbonate masses throughout; 15 percent gravel, 5 percent cobbles; strongly effervescent (9 percent calcium carbonate equivalent); moderately alkaline (pH 8.0); clear wavy boundary. (15 to 35 centimeters thick)
BCk--90 to 135 cm; yellowish brown (10YR 5/6) very gravelly sandy loam, dark yellowish brown (10YR 4/6) moist; massive; soft, very friable, nonsticky, nonplastic; few very fine roots; many fine tubular pores; 20 percent carbonate coats on rock fragments; 15 percent distinct fine masses of yellowish red (5YR 5/6) oxidized iron redox concentrations in matrix; 40 percent gravel, 10 percent cobbles, 2 percent stones; strongly effervescent (4 percent calcium carbonate equivalent); moderately alkaline (pH 8.0); clear wavy boundary. (35 to 60 centimeters thick)
C--135 to 200 cm; yellowish brown (10YR 5/4) very gravelly sandy loam, dark yellowish brown (10YR 4/6) moist; massive; soft, very friable, nonsticky, nonplastic; 40 percent gravel, 10 percent cobbles, 2 percent stones; slightly effervescent (3 percent calcium carbonate equivalent); slightly alkaline (pH 7.6).
TYPE LOCATION: Sublette County, Wyoming; located approximately 5 miles north of Merna, WY; located approximately 730 feet north and 2,520 feet west of the southeast corner of section 9, T 35N, R 113W; USGS Meadow Canyon, Wyoming topographic quadrangle; 43 degrees 0 minutes 47.00 seconds north latitude and 110 degrees 20 minutes 32.00 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil temperature - 1.5 to 4.0 degrees C.
Mollic epipedon thickness - 40 to 75 cm
Depth to top of argillic horizon - 20 to 45 cm
Depth to secondary calcium carbonate accumulation - 50 to 80 cm
Depth to redoximorphic features - 45 to 90 cm
A1, A2 horizons
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Clay content: 15 to 25 percent
Rock Fragments: 0 to 15 percent gravel
Reaction: pH 6.6 to 7.4
Bt horizon
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Texture (less than 2mm): sandy clay loam, clay loam
Clay content: 27 to 35 percent
Rock Fragments: 0 to 15 percent gravel
Reaction: pH 7.0 to 7.6
Btk horizon
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 4 to 6; dry or moist
Texture (less than 2mm): clay loam, sandy clay loam
Clay content: 25 to 35 percent
Carbonate clay content: 0 to 2 percent
Rock Fragments: 15 to 30 percent--10 to 20 percent gravel, 0 to 10 percent cobbles
Calcium carbonate equivalent: 5 to 10 percent
Reaction: pH 7.8 to 8.4
BCk horizon
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 4 or 6; dry or moist
Clay content: 5 to 12 percent
Rock Fragments: 45 to 65 percent--30 to 45 percent gravel, 5 to 15 percent cobbles, 0 to 5 percent stones
Calcium carbonate equivalent: 1 to 5 percent
Reaction: pH 7.6 to 8.4
C horizon
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 4 or 6; dry or moist
Texture (less than 2mm): loamy sand, sandy loam
Clay content: 5 to 12 percent
Rock Fragments: 45 to 65 percent--30 to 45 percent gravel, 5 to 15 percent cobbles, 0 to 5 percent stones
Calcium carbonate equivalent: 1 to 10 percent
Reaction: pH 7.6 to 8.4
COMPETING SERIES:
Bighole (MT) - does not have a seasonally high water table within 100 cm
Plimpton (MT) - does not have secondary calcium carbonate accumulation
Wallrock (WY) - have less than 15 percent rock fragments throughout
GEOGRAPHIC SETTING:
Landform - fan remnants and stream terraces
Elevation - 2,290 to 2,440 meters
Slope - 0 to 3 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: Somewhat poorly drained; moderate permeability. Seasonal high water table fluctuates between a depth of 45 and 90 centimeters at some time between the months of April and July.
USE AND VEGETATION: Beavet soils are used for irrigated grass hay and pasture. The potential native vegetation is mainly Garrison creeping foxtail, meadow foxtail, timothy, tufted hairgrass, and other miscellaneous sedges, rushes, and forbs.
DISTRIBUTION AND EXTENT: Beavet 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.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 65 cm (A1, A2 and Bt horizons)
Argillic horizon - 37 to 90 cm (Bt and Btk horizons)
Horizons with secondary calcium carbonate accumulation - 65 to 135 cm (Btk and BCk horizons)
Horizons with redox concentrations - 65 to 135 cm (Btk and BCk horizons)
Particle-size control section - 37 to 87 cm (Bt and part of Btk horizons).
Beavet soils have a cryic temperature regime, an ustic moisture regime and an oxyaquic moisture subclass.
Taxonomic version: Eleventh Edition, 2010.
National Cooperative Soil Survey
U.S.A.