LOCATION ANCENEY MTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Entic Haplustolls
TYPICAL PEDON: Anceney cobbly loam, in rangeland (Colors are for dry soil unless otherwise noted).
A--0 to 6 inches; very dark grayish brown (10YR 3/2) cobbly loam, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; 15 percent pebbles, 10 percent cobbles; neutral (pH 7.0); clear wavy boundary.
AB--6 to 10 inches; dark brown (10YR 3/3) gravelly loam, very dark brown (10YR 2/2) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and very fine roots; 20 percent pebbles, 10 percent cobbles; neutral (pH 7.0); clear wavy boundary. (Combined thickness of A and AB horizons is 7 to 12 inches).
Bk1--10 to 23 inches; pale brown (10YR 6/3) very gravelly loam, very dark brown (10YR 5/3) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine roots; 30 percent pebbles, 15 percent cobbles; few fine masses and seams of lime; common distinct lime coatings on underside of rock fragments; violently effervescent; slightly alkaline (pH 7.6); gradual wavy boundary.
Bk2-- 23 to 60 inches; pale brown (10YR 6/3) very cobbly loam, grayish brown (10YR 5/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few very fine roots; 30 percent pebbles, 25 percent cobbles; common distinct lime coatings on underside of rock fragments; violently effervescent; moderately alkaline (pH 8.0). (Combined thickness of Bk horizons is 40 to 60 inches).
TYPE LOCATION: Gallatin County, Montana; 2200 feet south and 1600 feet west of the NE corner of sec. 11, T.2S., R.1E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 41 to 45 degrees F.
Moisture control section -between 4 and 12 inches.
Mollic epipedon thickness - 7 to 12 inches.
Depth to calcic horizon - 8 to 12 inches.
A horizon - Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3
Clay content: 18 to 27 percent
Rock fragments: 15 to 35 percent--5 to 15 percent pebbles, 10 to 20 percent cobbles
Reaction: pH 6.6 to 7.3
AB horizon - Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3
Clay content: 18 to 27 percent
Rock fragments: 20 to 50 percent-- 10 to 30 percent pebbles, 10 to 20 percent cobbles
Reaction: pH 6.6 to 7.3
Bk1 horizon - Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 or 3
Texture: loam or sandy loam
Clay content: 18 to 27 percent
Rock fragments: 35 to 80 percent-- 20 to 50 percent pebbles, 15 to 30 percent cobbles
Calcium carbonate equivalent: 15 to 30 percent
Reaction: pH 7.4 to 8.4
Bk2 horizon - Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 or 3
Texture: loam or sandy loam
Clay content: 15 to 27 percent
Rock fragments: 35 to 80 percent--20 to 50 percent pebbles, 15 to 30 percent cobbles
Calcium carbonate equivalent: 15 to 30 percent
Reaction: pH 7.4 to 8.4
COMPETING SERIES:
Baahish (ND) - have a Bw horizon; have 2BCK and 2C horizons.
Bitton (MT) - have a Bw horizon; does not have a calcic horizon.
Debeque (CO) - does not have a calcic horizon.
Lilsheep (MT) - have a pralithic contact at 40 to 60 inches.
Syrett (UT) - have a lithic contact at 20 to 40 inches.
GEOGRAPHIC SETTING:
Landform - escarpments; alluvial fans; relict stream terraces.
Elevation - 4500 to 5700 feet.
Slope - 8 to 60 percent.
Parent material - alluvium; colluvium.
Climate - long, cold winters; moist springs; warm summers.
Mean annual precipitation - 15 to 19 inches.
Mean annual air temperature - 39 to 43 degrees F.
Frost-free period - 90 to 110 days.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Anceney soils are used mainly for rangeland and wildlife habitat. Potential native vegetation may include bluebunch wheatgrass, Idaho fescue, Columbia needlegrass, arrowleaf balsamroot and western yarrow.
DISTRIBUTION AND EXTENT: Anceney soils are of small extent in southwestern Montana.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Gallatin County, Montana, 1997.
REMARKS: Soil interpretation record: MT1442. Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from the soil surface to 10 inches (A, AB horizons); a calcic horizon from 10 to 60 inchedds (Bk1, Bk2 horizons); a particle size control section from 10 to 40 inches (Bk1, Bk2 horizons). Anceney soils have a frigid temperature regime and an ustic moisture regime.