LOCATION WETPARK MT
Tentative Series
IRD. KTS-EMM
02/2012
WETPARK SERIES
The Wetpark series consists of very deep, very poorly drained soils that formed in slope alluvium and colluvium from mixed rock sources. These soils occur on structural benches and mountain slopes. Slopes are 1 to 25 percent. Mean annual precipitation is about 700 mm, and the mean annual temperature is about 4 degrees C.
TAXONOMIC CLASS: Clayey-skeletal, mixed, superactive Typic Cryaquolls
TYPICAL PEDON: Wetpark silty clay loam, in a wet meadow on a 6 percent slope at an elevation of 2115 meters (Colors are for dry soil unless otherwise noted).
Oa--0 to 9 cm; muck; highly decomposed organic materials; clear smooth boundary. (0 to 12 cm thick)
Ag--9 to 37 cm; dark gray (10YR 4/1) silty clay loam, black (10YR 2/1) moist; many medium prominent strong brown (7.5YR 5/6) redox concentrations; moderate medium granular structure; hard, firm, moderately sticky and moderately plastic; many very fine, fine, and medium roots; many very fine and fine irregular pores; 5 percent gravel; slightly acid (pH 6.4); clear smooth boundary. (10 to 30 cm thick)
Bg1--37 to 57 cm; gray (10YR 6/1) very cobbly silty clay loam, dark gray (10YR 4/1) moist; common medium prominent strong brown (7.5YR 5/6) redox concentrations; strong medium and coarse subangular blocky structure; very hard, firm, very sticky and very plastic; many very fine, fine, and medium roots; many very fine and fine irregular pores; 25 percent gravel and 25 percent cobbles; slightly acid (pH 6.2); gradual wavy boundary.
Bg2--57 to 85 cm; brown (10YR 5/3) very gravelly silty clay, brown (10YR 4/3) moist; many medium prominent strong brown (7.5YR 5/6) redox concentrations; strong medium and coarse subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine, fine, and medium roots; many very fine and fine irregular pores; 25 percent gravel and 15 percent cobbles; slightly acid (pH 6.4); gradual wavy boundary. (combined thickness of Bg horizons - 25 to 50 cm)
Cg--85 to 152 cm; grayish brown (10YR 5/2) very gravelly clay loam, dark grayish brown (10YR 4/2) moist; few medium prominent strong brown (7.5YR 5/6) redox concentrations; massive; very hard, very firm, very sticky and very plastic; many very fine and fine irregular pores; 25 percent gravel and 15 percent cobbles; slightly acid (pH 6.4).
TYPE LOCATION: Meagher County, Montana; located 365 meters east and 140 meters south of the northwest corner of sec. 14, T.13N., R7E.; Belt Park Butte topographic quadrangle; UTM 12T, 0513960e., 5193449n. NAD 83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 1 to 4 degrees C.
Thickness of mollic epipedon - 25 to 50 cm
Depth to seasonally high water table - 0 to 30 cm
Particle size control section
Clay content - averages 35 to 50 percent clay
Ag horizon
Value: 4 or 5 dry; 2 or 3 or moist
Chroma: 1 or 2; dry or moist
Clay content: 27 to 40 percent
Rock fragments: 0 to 15 percent gravel or cobbles
Reaction: pH 5.6 to 6.5
Bg horizons
Value: 5 or 6 dry; 2 to 4 moist
Chroma: 1 to 3 dry or moist
Texture: silty clay loam, silty clay, clay loam, or clay
Clay content: 35 to 50 percent
Rock fragments: 25 to 60 percent gravel or cobbles
Reaction: pH 5.6 to 6.5
Cg horizons
Hue: 10YR or 7.5YR
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2, 3 or 4; dry or moist
Texture: clay loam, silty clay loam, silty clay or clay
Clay content: 30 to 50 percent
Rock fragments: 35 to 60 percent gravel or cobbles
Reaction: pH 5.6 to 7.0
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform - structural benches and mountain slopes.
Elevation - 2020 to 2450 meters.
Slope - 1 to 25 percent.
Parent material - slope alluvium and colluvium from mixed rock sources.
Climate - long, cold winters; moist springs; short warm summers.
Mean annual precipitation - 600 to 900 mm.
Mean annual air temperature - 1 to 4 degrees C.
Frost-free period - 20 to 50 days.
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: very poorly drained and slow permeability.
USE AND VEGETATION: Wetpark soils are used mainly for wildlife. The vegetation is mainly sedges, rushes, grasses and miscellaneous forbs.
DISTRIBUTION AND EXTENT: Wetpark soils are of small extent in central Montana. MLRA 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES PROPOSED: Meagher County, Montana, 2012. Wetpark series is named for Wet Park, a named place on the Belt Park Butte topographic quadrangle.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 9 to 37 cm (Ag horizon)
Particle-size control section - from 34 to 109 cm (part of the Ag, Bg1, Bg2, and part of the Cg horizons)
Wetpark soils have a cryic temperature regime and a udic moisture regime.
Taxonomic version: Eleventh Edition, 2010.
National Cooperative Soil Survey
U.S.A.