LOCATION ANNIESDRAW WY
Tentative Series
Rev. TAG-DMM-RJS
03/2011
ANNIESDRAW SERIES
The Anniesdraw series consists of very deep, well drained soils that formed in slope alluvium derived from metamorphic and sedimentary rock over residuum derived from sandstone and shale. These soils are on eroded fan remnants. Slopes are 2 to 15 percent. Mean annual precipitation is about 430 mm, and mean annual air temperature is about 1 degree C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Ustic Argicryolls
TYPICAL PEDON: Anniesdraw loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 10 cm; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; many very fine and fine roots, and common medium and coarse roots; many fine interstitial pores; 10 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (8 to 18 cm thick)
Bt1--10 to 30 cm; brown (7.5YR 4/3) gravelly loam, dark brown (7.5YR 3/3) moist; moderate fine and medium subangular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; many very fine and fine roots, and common medium and coarse roots; many fine interstitial pores; 10 percent faint clay films on all faces of peds; 15 percent gravel, 5 percent cobbles; slightly acid (pH 6.4); clear wavy boundary. (15 to 25 cm thick)
Bt2--30 to 99 cm; yellowish brown (10YR 5/6) very gravelly sandy clay loam, dark yellowish brown (10YR 4/6) moist; weak fine and medium subangular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; many very fine and fine roots, and common medium and coarse roots; many fine interstitial pores; 20 percent distinct clay films on all faces of peds; 40 percent gravel, 15 percent cobbles; neutral (pH 6.6); clear wavy boundary. (50 to 80 cm thick)
2BCk1--99 to 140 cm; 60 percent gray (10YR 6/1) silty clay, 60 percent gray (10YR 5/1) moist; 10 percent coarse dark yellowish brown (10YR 4/4) and 20 percent coarse dark yellowish brown (10YR 4/6) mottles; massive; very hard, extremely firm, very sticky, very plastic; common very fine and fine roots, and few medium and coarse roots; common fine tubular pores; 40 percent threadlike carbonate masses in matrix; violently effervescent (5 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear wavy boundary.
2BCk2--140 to 200 cm; 80 percent reddish brown (5YR 4/4) silty clay, 80 percent reddish brown (2.5YR 4/4) moist; 10 percent medium gray (5YR 5/1) mottles; massive; very hard, extremely firm, very sticky, very plastic; common very fine and fine roots, and few medium and few coarse roots; common fine tubular pores; 20 percent threadlike carbonate masses in matrix; violently effervescent (5 percent calcium carbonate equivalent); moderately alkaline (pH 8.0). (combined thickness of the 2BCK horizons is 80 to 120 cm)
TYPE LOCATION: Sublette County, Wyoming: located approximately 780 feet North and 1,375 feet West of the SE corner of the section. of section 28, T 36N, R 112W; USGS Signal Hill, Wyoming topographic quadrangle; 43 degrees 3 minutes 22.00 seconds north latitude and 110 degrees 13 minutes 11.00 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil temperature - 1.7 to 3.3 degrees C.
Mollic epipedon thickness - 18 to 40 cm
Depth to argillic horizon - 10 to 18 cm
Depth to secondary carbonates - 90 to 110 cm
Depth to lithologic discontinuity - 80 to 120 cm
Particle-size control section rock fragments - averages greater than 35 percent
A horizon
Hue: 7.5 YR or 10YR; dry or moist
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Clay content: 15 to 22 percent
Rock fragments: 5 to 15 percent--5 to 10 percent gravel, 0 to 5 percent cobbles
Reaction: pH 6.1 to 6.5
Bt1 horizon
Hue: 7.5YR or 10YR; dry or moist
Texture: sandy clay loam, loam, clay loam
Clay content: 20 to 35 percent
Rock fragments: 20 to 40 percent--15 to 30 percent gravel; 5 to 10 percent cobbles
Reaction: pH 6.1 to 6.5
Bt2 horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 4 to 6; dry or moist
Texture: sandy clay loam, loam, clay loam
Clay content: 20 to 35 percent
Carbonate clay content: 0 to 1 percent
Rock fragments: 40 to 60 percent--30 to 45 percent gravel; 10 to 15 percent cobbles
Calcium carbonate equivalent: 0 to 1 percent
Reaction: pH 6.6 to 7.3
2BCk1, 2BCk2 horizons
Hue: 10YR, 2.5YR or 5YR; dry or moist
Value: 4 to 6 dry; 4 or 5 moist
Chroma: 1 to 4; dry or moist
Texture: silty clay loam, clay, silty clay
Clay content: 35 to 50 percent
Carbonate clay content: 1 to 4 percent
Rock fragments: 0 to 15 percent gravel or channers
Calcium carbonate equivalent: 2 to 6 percent
Reaction: pH 7.9 to 8.4
COMPETING SERIES:
Bassel (CO) - have a paralithic contact at depths of 100 to 150 cm
Blaine (MT) - have a lithic contact at depths of 50 to 100 cm
Bowen (CO) - does not have secondary carbonate accumulation
Fingerrock (CO) - does not have secondary carbonate accumulation
Fornor (WY) - does not have a lithologic discontinuity
Fourmile (CO) - does not have secondary carbonate accumulation
Geertsen (UT) - does not have a lithologic discontinuity
Hoodle (UT) - does not have a lithologic discontinuity
Hungryhill (MT) - have a lithic contact at depths of 50 to 100 cm
Lagarita (CO) - does not have a lithologic discontinuity
Lambe (CO) - does not have a lithologic discontinuity
Libeg (MT) - does not have a lithologic discontinuity
Nathale (WY) - have a lithic contact at depths of 50 to 100 cm
Nathrop (CO) - have a lithic contact at depths of 50 to 100 cm
Norriston (CO) - does not have secondary carbonate accumulation
Quander (CO) - does not have a lithologic discontinuity
Ratiopeak (MT) - does not have a lithologic discontinuity
Silverheels (CO) - does not have a lithologic discontinuity
Spanpeak (MT) - does not have a lithologic discontinuity
Woodhall (CO) - have a lithic contact at depths of 50 to 100 cm
GEOGRAPHIC SETTING:
Landform - eroded fan remants
Elevation - 2,250 to 2,470 meters
Slope - 2 to 15 percent
Parent Material - slope alluvium derived from metamorphic and sedimentary rock over residuum derived from sandstone and shale
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 380 to 485 mm with peak periods of precipitation occuring during the spring
Mean annual air temperature - 0.6 to 1.7 degrees C.
Frost-free period - 25 to 45 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Anniesdraw 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: Anniesdraw soils are of minor extent in southwestern Wyoming. MLRA 34A and 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES PROPOSED: Sublette County, Wyoming, 2011. The series is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 30 cm (A, Bt1 horizons)
Argillic horizon - 10 to 99 cm (Bt1, Bt2 horizons)
Secondary carbonates - 99 to 200 cm (2BCk1, 2BCk2 horizons)
Particle-size control section - from 10 to 60 cm (Bt1 and part of Bt2 horizons).
Anniesdraw soils have a cryic temperature regime and an ustic moisture regime.
National Cooperative Soil Survey
U.S.A.