LOCATION SHABOOM MT+WY
Established Series
Rev. PEM-JAL-KLS
01/2023
SHABOOM SERIES
The Shaboom series consists of shallow, well drained soils that formed in residuum, slope alluvium or colluvium from coarse grained igneous bedrock. These soils are on escarpments, ridges and sideslopes of hills. Slopes are 4 to 75 percent. Mean annual precipitation is about 430 mm, and mean annual air temperature is about 5 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Lithic Haplustepts
TYPICAL PEDON: Shaboom gravelly coarse sandy loam, very bouldery in forest (colors are for dry soil unless otherwise noted).
Oi--0 to 3 cm; forest litter of partially decomposed needles, twigs, and leaves.
A--3 to 11 cm; brown (10YR 5/3) gravelly coarse sandy loam, dark brown (10YR 3/3) moist; weak fine and very fine granular structure; soft, very friable, slightly sticky and nonplastic; many very fine, few fine, and few medium roots; many fine and very fine pores; 5 percent cobbles, 20 percent pebbles; neutral (pH 7.1); clear wavy boundary. (8 to 10 cm thick)
Bw--11 to 34 cm; very pale brown (10YR 7/4) very gravelly coarse sandy loam, dark yellowish brown (10YR 4/4) moist; weak medium and fine subangular blocky structure parting to weak fine and very fine granular; soft, very friable, slightly sticky and nonplastic; many very fine, few fine and medium roots; many very fine tubular pores; 15 percent cobbles, 35 percent pebbles; neutral (pH 6.8).
R--34 cm; hard granite bedrock.
TYPE LOCATION: Jefferson County, Montana; about 1020 meters north and 505 meters east of the SW corner of sec. 32, T. 9 N., R. 2 W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 7 degrees C
Moisture control section--10 to 30 cm, or between 10 cm and the lithic contact if less than 30 cm
Depth to lithic contact--25 to 50 cm
Surface stones or boulders--0 to 15 percent
Particle-size control section:
Sand content--45 to more than 60 percent medium or coarser sand
A thin, less than 8 cm, Cr horizon of partially decomposed grus between the depths of 25 to 36 cm is allowed.
A horizon
Hue--10YR or 2.5Y
Value--4 through 6 dry; 3 through 5 moist
Chroma--2 or 3
Texture--coarse sandy loam, sandy loam, sandy clay loam, or loam
Clay content--12 to 25 percent
Rock fragment content--10 to 35 percent total; 10 to 20 percent gravel and 0 to 15 percent cobbles
Reaction--pH 6.1 to 7.3
Bw horizon
Hue--10YR or 2.5Y
Value--5 through 7 dry; 4 or 5 moist
Chroma--2 through 4
Texture--coarse sandy loam, sandy loam, or sandy clay loam
Clay content--18 to 25 percent
Rock fragment content--35 to 60 percent total; 30 to 45 percent gravel and 5 to 15 percent
Reaction--pH 5.6 to 7.3
COMPETING SERIES:
Cinnadale (NM) - has hues of 5YR and redder throughout; has less than 35 percent fine and coarser sand in the particle-size control section
Cypher (NM) - has C horizons; has less than 45 percent medium and coarser sand in the particle-size control section
Devilfence (MT) - has horizons of secondary carbonate accumulation
Deville (MT) - does not have an O horizon; formed in residuum from hard shale
Kounter (MT) - has horizons of secondary carbonate accumulation; has a paralithic contact above the lithic contact
Roegulch (MT) - has a paralithic contact over the lithic contact; has moderate permeability
Quaint (MT) - has horizons of secondary carbonate accumulation; is mildly or moderately alkaline below the surface horizon; has hues of 7.5YR and redder
Sharrott (MT) - has 10 to 15 percent clay and less than 45 percent medium and coarser sands; they formed in residuum and colluvium from argillite or quartzite
GEOGRAPHIC SETTING:
Landform--escarpments, ridges and sideslopes of hills
Elevation--1350 to 1825 meters
Slope--4 to 70 percent
Parent material--residuum, slope alluvium or colluvium from coarse grained granitic bedrock
Climate--long, cold winters; moist springs; warm summers
Mean annual precipitation--380 to 480 mm
Mean annual air temperature--3 to 6 degrees C
Frost-free period--70 to 105 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND PERMEABILITY: Well drained, moderate permeability
USE AND VEGETATION: Shaboom soils are mainly used as woodland. The potential native vegetation is mainly Douglas-fir, ponderosa pine, pinegrass, common snowberry, kinnikinnick, rough fescue, Idaho fescue, bluebunch wheatgrass, forbs, and low shrubs.
DISTRIBUTION AND EXTENT: Shaboom soils are of small extent in southwestern Montana and southwestern Wyoming; MLRA 43B
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Jefferson County, Montana, 1998
REMARKS: Soil interpretation record: MT1534, MT3017
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon--3 to 18 cm, mixed (A, Bw horizons)
Cambic horizon--11 to 34 cm (Bw horizon)
Particle-size control section--3 to 34 cm (A, Bw horizons)
Lithic contact--34 cm (R horizon)
Shaboom soils have a frigid temperature regime and an ustic soil moisture regime.
Converted to metric and O horizons were updated to start at zero. Competing series section was not updated. 01/2023
National Cooperative Soil Survey
U.S.A.