LOCATION ROOSET WY+ID MT
Established Series
Rev. AJC-JJU-RJS
06/2011
ROOSET SERIES
The Rooset series consists of very deep, well drained soils formed in alluvium, slope alluvium, colluvium or slide deposits derived from mixed sources. They are on alluvial fans, escarpments, hills, mountains and landslides. Slopes are 2 to 45 percent. Average annual precipitation is about 18 inches and the average annual temperature is about 39 degrees F.
TAXONOMIC CLASS: Clayey-skeletal, smectitic Ustic Argicryolls
TYPICAL PEDON: Rooset gravelly loam, rangeland (colors are for dry soil unless otherwise noted).
A--0 to 7 inches; grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; strong fine granular and crumb structure; soft, very friable; 15 percent gravel; neutral (pH 6.7); clear smooth boundary. (4 to 10 inches thick)
BA--7 to 11 inches; brown (10YR 5/3) gravelly clay loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; hard, very friable; 15 percent gravel; few faint clay films on faces of peds; neutral (pH 6.7); clear smooth boundary. (0 to 5 inches thick)
Bt--11 to 24 inches; brown (7.5YR 5/3) very gravelly clay loam, brown (7.5YR 4/3) moist; strong fine angular blocky structure; extremely hard, very friable; continuous distinct clay films on faces of peds, on coarse fragments and fillings in root channels and pores; 50 percent gravel; neutral (pH 6.8); clear wavy boundary. (6 to 35 inches thick)
Btk--24 to 30 inches; brown (7.5YR 5/3) very gravelly clay loam, brown (7.5YR 4/3) moist; moderate medium subangular blocky structure; very hard, very friable; faint clay films on faces of peds and in root channels; 75 percent gravel; visible secondary calcium carbonate as concretions, in thin seams and streaks, and as coatings on rock fragments; calcareous; moderately alkaline (pH 8.2); gradual wavy boundary. (0 to 8 inches thick)
BCk--30 to 60 inches; light brown (7.5YR 6/4) very gravelly clay loam, brown (7.5YR 5/4) moist; massive; hard, very friable; 75 percent gravel; visible secondary calcium carbonate occurring as concretions, in thin seams and streaks, and as coatings on rock fragments; calcareous; moderately alkaline (pH 8.2).
TYPE LOCATION: Lincoln County, Wyoming; SE1/4 of the SW1/4 of the SW1/4 of sec. 5, T. 33N, R. 119W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 35 to 44 degrees F.
Thickness of mollic epipedon - 7 to 15 inches
Depth to secondary calcium carbonate accumulation - 10 to 48 inches
Note: Some pedons may have a Bk horizon.
A, BA horizons
Hue: 2.5Y, 10YR or 7.5YR
Value: 4 or 5 dry; 2 or 3 moist
Chroma: 1 to 3; dry or moist
Texture: loam or clay loam
Clay content: 18 to 35 percent
Rock fragments: 15 to 35 percent
Reaction: slightly acid to slightly alkaline
Bt, Btk horizon
Hue: 2.5Y, 10YR or 7.5YR
Value: 5 or 6 dry; 3 to 5 moist
Chroma: 2 to 4; dry or moist
Texture: clay loam or clay
Clay content: 35 to 50 percent
Rock fragments: 35 to 80 percent
Reaction: slightly acid to slightly alkaline
Bk horizon (where present)
Hue: 2.5Y, 10YR or 7.5YR
Value: 5 or 6 dry; 4 to 5 moist
Chroma: 2 to 4; dry or moist
Texture: loam or clay loam
Clay content: 20 to 35 percent
Rock fragments: 35 to 75 percent
Calcium carbonate equivalent: 4 to 14 percent
Reaction: moderately alkaline.
BCk horizon
Hue: 2.5Y, 10YR or 7.5YR
Value: 5 or 6 dry; 4 to 5 moist
Chroma: 2 to 4; dry or moist
Texture: loam or clay loam
Clay content: 20 to 35 percent
Rock fragments: 20 to 75 percent
Calcium carbonate equivalent: 4 to 14 percent
Reaction: moderately alkaline.
COMPETING SERIES:
Embargo (CO) - are moderately deep to a lithic contact
Evna (CO) - do not have secondary calcium carbonate accumulation
Passar (CO) - do not have secondary calcium carbonate accumulation
Redchief (MT) - do not have secondary calcium carbonate accumulation
Tellura (CO) - do not have secondary calcium carbonate accumulation
GEOGRAPHIC SETTING:
Landform - alluvial fans, escarpments, hills, mountains and landslides
Elevation - none listed
Slope - 2 to 45 percent
Parent material - alluvium, slope alluvium, colluvium or slide deposits derived from mixed sources
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 15 to 24 inches (equal amounts of precipitation occurring during most months)
Mean annual air temperature - 35 to 39 degrees F.
Frost-free period - 50 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; slow to moderate permeability.
USE AND VEGETATION: These soils are used principally as native pastureland. They are used for irrigated meadows in some locations. Principal native vegetation is aspen, native bluegrass, and fescue.
DISTRIBUTION AND EXTENT: High mountain valleys of Wyoming, Idaho, and Montana. The series is of moderate extent. MLRAs - 43B, 44B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Star Valley Area, Idaho and Wyoming, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 0 to 11 inches (A, BA horizons)
Argillic horizon - from 11 to 30 inches (Bt, Btk horizons)
Secondary calcium carbonate accumulation - from 24 to 60 inches (Btk, BCk horizons)
Particle-size control section - from 11 to 30 inches (Bt, Btk horizons)
Rooset soils have a cryic temperature regime and an ustic moisture regime.
National Cooperative Soil Survey
U.S.A.