LOCATION YNOT MTEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Aridic Haplustolls
TYPICAL PEDON: Ynot sandy loam, in rangeland (colors are for dry soil unless otherwise stated).
A--0 to 6 inches; brown (10YR 5/3) sandy loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine tubular pores; neutral (pH 6.8); clear smooth boundary. (4 to 10 inches thick)
Bw1--6 to 13 inches; grayish brown (10YR 5/2) sandy loam, very dark grayish brown (10YR 3/2) moist; moderate coarse and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; many very fine and few fine roots; many very fine and common fine tubular pores; neutral (pH 6.8) clear smooth boundary.
Bw2--13 to 18 inches; light yellow brown (2.5Y 6/4) sandy loam, olive brown (2.5Y 4/4) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and few fine roots; many very fine and common fine tubular pores; neutral (pH 7.0); gradual smooth boundary. (Combined thickness of the Bw horizons is 10 to 21 inches.)
C--18 to 60 inches; light yellowish brown (2.5Y 6/4) sandy loam; light olive brown (2.5Y 5/4) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; few very fine and common fine pores; neutral (pH 7.2).
TYPE LOCATION: Fallon County, Montana; 2,200 feet east and 2,500 feet south of the NW corner of sec. 35, T.1 N., R.58 E.
RANGE IN CHARACTERISTICS:
Soil temperature - 42 to 47 degrees F.
Moisture control section - between 12 and 35 inches; dry in some part for six tenths or more of the cumulative days per year when the soil temperature at a depth of 20 inches is higher than 41 degrees F.
Mollic epipedon thickness - 7 to 16 inches (includes part of the Bw horizon).
Control section - 10 to 18 percent clay.
Some soils are calcareous below a depth of 40 inches.
A horizon - Hue: 10YR or 2.5Y
Value: 2 or 3 moist
Chroma: 2 or 3
Clay content: 10 to 18 percent
Reaction: pH 6.1 to 7.3
Bw horizons - Hue: 10YR or 2.5Y
Value: 5, 6, or 7 dry; 3, 4, 5, or 6 moist
Chroma: 2, 3, or 4
Texture: sandy loam or fine sandy loam
Clay content: 10 to 18
Reaction: pH 6.1 to 7.3
C horizon - Hue: 10YR, 2.5Y, or 5Y
Value: 5, 6, or 7 dry; 4, 5, or 6 moist
Chroma: 2, 3, or 4
Texture: sandy loam or fine sandy loam
Clay content: 10 to 18 percent
Reaction: pH 6.1 to 7.8
COMPETING SERIES:
Anaconda (MT) - have a calcic horizon.
Chinook (MT) - have secondary carbonate accumulation above a depth of 40 inches.
Cozberg (MT) - have secondary carbonate accumulation above a depth of 40 inches.
Lahood (MT) - has a lithic contact at 20 to 40 inches.
Pring (CO) - are extremely hard at a depth of 20 inches; formed in arkose materials that have a high percent of flat bearing surface.
Rhame (ND) - have secondary carbonate accumulation above a depth of 40 inches.
Tinytown (CO) - have hues redder than 10YR in the cambic horizon; have more than 15 percent coarse fragments in the control section.
GEOGRAPHIC SETTING:
Landform - stream terraces; alluvial fans; sedimentary plains; hills.
Elevation - 2,500 to 3,200 feet.
Slope- 0 to 15 percent.
Parent material - alluvium or eolian material.
Climate - cool with long, cold winters; moist springs; warm summers.
Mean annual precipitation - 10 to 14 inches.
Mean annual temperature - 41 to 45 degrees F.
Frost-free period - 110 to 135 days.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: Ynot soils are used for range and nonirrigated crops. The native vegetation consists of needleandthread, prairie sandreed, bluebunch wheatgrass, little bluestem, forbs, and shrubs.
DISTRIBUTION AND EXTENT: Southeastern Montana. Ynot soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Fallon County, Montana, 1991.
REMARKS: Soil interpretations record: MT1269. Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from 0 to 13inches (A, Bw1 horizons); a cambic horizon from 13 to 18 inches (Bw2 horizon); a particle-size control section from 10 to 40 inches (Bw1, Bw2, C horizons). Ynot soils have a frigid temperature regime and an ustic moisture regime bordering on aridic.