LOCATION FARSIDE MTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Argiustolls
TYPICAL PEDON: Farside loam, in cropland (Colors are for dry soil unless otherwise noted).
A--0 to 11 inches; very dark grayish brown (10YR 3/2) loam, black (10YR 2/1) moist; weak fine subangular blocky structure parting to moderate fine granular; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine and medium roots; 5 percent pebbles, 5 percent cobbles; slightly acid (pH 6.4); clear smooth boundary. (7 to 12 inches thick)
Bt1--11 to 14 inches; dark grayish brown (10YR 4/2) sandy clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and slightly plastic; common very fine and few medium roots; common distinct clay films on faces of peds and lining pores; 5 percent pebbles; neutral (pH 6.6); clear smooth boundary.
Bt2--14 to 31 inches; dark brown (10YR 4/3) sandy clay loam, dark grayish brown (10YR 4/2) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky and slightly plastic; common very fine roots; common distinct clay films on faces of peds and lining pores; 10 percent pebbles; neutral (pH 6.6); clear smooth boundary. (Combined thickness of Bt horizons is 6 to 25 inches).
C--31 to 60 inches; brown (10YR 5/3) gravelly coarse sandy loam, dark yellowish brown (10YR 4/4) moist; massive; loose, nonsticky and nonplastic; few very fine roots; 20 percent pebbles, 5 percent cobbles; neutral (pH 6.8).
TYPE LOCATION: Gallatin County, Montana; 1300 feet south and 900 feet west of the northeast corner of sec. 11, T.3S., R.5E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 39 to 43 degrees F.
Moisture control section - between 4 and 12 inches.
Mollic epipedon thickness - 8 to 15 inches.
A horizon - Value: 3 or 4 dry; 2 or 3 moist
Clay content: 18 to 27 percent
Rock fragments: 0 to 15 percent--0 to 10 percent pebbles,
0 to 5 percent cobbles
Reaction: pH 6.1 to 7.3
Bt1 horizon - Value: 3 or 4 moist
Chroma: 2, 3 or 4
Texture: sandy clay loam or clay loam
Clay content: 20 to 35 percent
Rock fragments: 0 to 15 percent--0 to 10 percent pebbles,
0 to 5 percent cobbles
Reaction: pH 6.1 to 7.3
Bt2 horizon - Value: 3 or 4 moist
Chroma: 2, 3 or 4
Texture: sandy clay loam or clay loam
Clay content: 20 to 35 percent
Rock fragments: 0 to 15 percent--0 to 10 percent pebbles,
0 to 5 percent cobbles
Reaction: pH 6.1 to 7.3
C horizon - Value: 4 or 5 dry
Chroma: 3, 4, 5 or 6
Texture: coarse sandy loam or sandy loam
Clay content: 5 to 18 percent
Rock fragments: 15 to 45 percent--10 to 25 percent pebbles,
5 to 20 percent cobbles
Reaction: pH 6.1 to 7.3
Note: This horizon may contain thin strata of sandy clay loam.
COMPETING SERIES:
Absarook (MT) - has a lithic contact at 20 to 40 inches.
Archmesa (CO) - has a lithic contact at 20 to 40 inches.
Beartooth (MT) - has horizon of secondary carbonate accumulation.
Beeno (WY) has horizons of secondary carbonate accululation.
Bielenberg (MT) - has a paralithic contact at 40 to 60 inches.
Bookcliff (UT) - has a lithic contact at 40 to 60 inches.
Burtoner (MT) - has a paralithic contact at 20 to 38 inches.
Clancy (MT) - has a lithic contact above a depth of 60 inches.
Clasoil (MT) - has 12 to 20 percent clay below the argillic horizon.
Doughty (MT) - has horizons of secondary carbonate accumulation.
Dooley (MT) - has horizons of secondary carbonate accumulation.
Empedrado (CO) - has horizons of secondary carbonate accumulation.
Fairfield (MT) - has horizons of secondary carbonate accumulation.
Farnuf (MT) - has horizons of secondary carbonate accumulation.
Felor (SD) - has a discontinuity of clayey sediments at 20 to 35 inches.
Greenway (SD) - has a discontinuity of till at 15 to 25 inches.
Gurney (SD) - has a lithic contact at of 20 to 40 inches.
Hangdo (UT) - has a buried argillic horizon.
Hoppers (MT) - has a lithic contact at 20 to 40 inches.
Hyalite (MT) - has a sandy-skeletal discontinuity below the argillic horizon.
Jeffcity (MT) - has paralithic and lithic contacts at 20 to 40 inches.
Kokoruda (MT) - has an O horizon.
Livona (ND) - has horizons of secondary carbonate accumulation.
Martinsdale (MT) - has horizons of secondary carbonate accumulation.
Maudlin (CO) - has a lithic contact between depths of 20 to 40 inches.
Meagher (MT) - has horizons of secondary carbonate accumulation.
Moen (CO) - has a lithic contact at of 20 to 40 inches.
Moento (CO) - has a lithic contact at 20 to 40 inches.
Pianohill (MT) - has a lithic contact of mudflow breccia at 20 to 40 inches.
Placerton (MT) - has a lithic contact above 60 inches.
Reeder (ND) - has a paralithic contact at of 20 to 40 inches.
Reedwest (MT) - has a paralithic contact at 20 to 40 inches.
Sipple (MT) - has horizons of secondary carbonate accumulation.
Snakejohn (UT) - has a lithic contact at 40 to 60 inches.
Sponseller (AZ) - has hues redder than 10YR throughout the profile.
Tragmon (CO) - has mean annual soil temperature of 45 to 48 degrees F.
Trazuni (NM) - has mottles at 35 to 50 inches.
Ulrant (WY) - has a lithic contact at 40 to 60 inches.
Vida (MT) - has horizons of secondary carbonate accumulation.
Watne (MT) - has horizons of secondary carbonate accumulation.
Watrous (ND) - has a lithic contact at 20 to 40 inches.
Williams (ND) - has horizons of secondary carbonate accumulation.
Yegen (MT) - has horizons of secondary carbonate accumulation.
GEOGRAPHIC SETTING:
Landform - alluvial fans and stream terraces.
Elevation - 5,200 to 5,600 feet.
Slope - 2 to 15 percent.
Parent material - alluvium derived from gneiss, schist and sandstone.
Climate - long cold winters; moist springs; warm summers.
Mean annual precipitation - 18 to 22 inches.
Mean annual air temperature - 37 to 41 degrees F.
Frost-free period - 80 to 95 days.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: Farside soils are used mainly for rangeland and cropland. Potential native vegetation includes subalpine needlegrasses, rough fescue, spike fescue, Idaho fescue, big bluegrass, mountain brome, sedges, lupine, sticky geranium and other forbs.
DISTRIBUTION AND EXTENT: Farside 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: MT1626. Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from the surface to 14 inches (A, Bt1 horizons); an argillic horizon from 11 to 31 inches; (Bt1, Bt2 horizons); a particle size control section from 11 to 31 inches (Bt1, Bt2). Farside soils have a frigid temperature regime and an ustic moisture regime bordering on udic.