LOCATION LANTONIA ID+WYEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Lantonia silt loam, cultivated. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 6 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak very fine granular structure; hard, friable, slightly sticky and slightly plastic; many fine roots; common very fine pores; neutral (pH 6.9); abrupt smooth boundary. (5 to 9 inches thick).
A--6 to 12 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; very weak coarse prismatic structure parting to very weak coarse subangular blocky; hard, friable, slightly sticky and slightly plastic; common fine roots; slightly acid (pH 6.5); clear smooth boundary. (4 to 8 inches thick).
ABt--12 to 18 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak medium and coarse prismatic structure parting to weak medium and coarse subangular blocky; few faint clay films on vertical surfaces and in pores; slightly acid (pH 6.5); clear smooth boundary. (0 to 8 inches thick).
Bt1--18 to 24 inches; dark grayish brown (10YR 4/2) (10YR 5/3 crushed) silt loam, very dark grayish brown (10YR 3/2) moist; moderate coarse prismatic structure parting to moderate medium subangular blocky; hard, firm, slightly sticky and slightly plastic; common fine roots; common very fine pores; few distinct clay films on vertical surfaces and in pores; faint light gray uncoated silt coatings on vertical surfaces; neutral (pH 6.9); clear smooth boundary. (6 to 12 inches thick)
Bt2--24 to 28 inches; brown (10YR 5/3) silt loam, dark grayish brown (10YR 4/2) moist; moderate coarse and medium prismatic structure parting to weak medium subangular blocky; hard, firm, slightly sticky and slightly plastic; few fine roots; few very fine pores; faint patchy clay films on vertical surfaces and in pores, few faint clay films on horizontal surfaces; uncoated silt coatings as in horizon above; neutral (pH 6.9); clear wavy boundary. (4 to 10 inches thick)
Bt3--28 to 37 inches; brown (10YR 5/3)(10YR 6/3 crushed) silt loam, dark grayish brown (10YR 4/2) moist; very weak coarse prismatic structure parting to weak medium subangular blocky; hard, friable, slightly sticky and slightly plastic; few fine roots; common very fine pores; few faint clay films; very faint light gray uncoated silt coatings on vertical surfaces; slightly alkaline (pH 7.5); abrupt wavy boundary. (8 to 20 inches thick)
Bk1--37 to 52 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; very weak coarse prismatic structure parting to weak coarse subangular blocky; hard, friable, slightly sticky and slightly plastic; few fine roots; common very fine pores; strongly effervescent and many veins of calcium carbonate; slightly alkaline (pH 7.8); gradual wavy boundary. (8 to 18 inches thick).
Bk2--52 to 68 inches; light gray (10YR 7/2) silt loam, brown (10YR 5/3) moist; massive; hard, friable, slightly sticky and slightly plastic; few fine roots; common very fine tubular pores; strongly effervescent and few calcium carbonate veins; moderately alkaline (pH 7.9); gradual wavy boundary. (0 to 16 inches thick).
2C--68 to 110 inches; pale brown (10YR 6/3)(10YR 7/2 crushed) silt loam, brown (10YR 4/3)(10YR 5/3 crushed) moist; massive; hard, friable; slightly sticky and slightly plastic; strongly effervescent; moderately alkaline (pH 8.0).
TYPE LOCATION: Teton County, Idaho; 2.5 miles north and 1 mile west of Felt; 108 feet north and 250 feet west of the southeast corner of section 24, T.7N., R.44E.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 16 to 30 inches.
Depth to secondary carbonates - 35 to 60 inches.
Annual soil temperature - 38 to 47 degrees F.
Summer soil temperature - 55 to 59 degrees F.
A horizons
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 1 to 3 dry or moist.
Clay content: 10 to 18 percent
Reaction: slightly acid or neutral.
Bt or Bw horizons
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4 dry, 2 or 3 moist.
Clay films: frequency of few or common; faint to distinct; morphology of vertical faces of peds and pores.
Clay content: 10 to 18 percent; less than 3 percent more clay than the A horizon.
Uncoated silt: has frequncy of few or common: morphology of vertical and horizontal faces of peds.
Reaction: neutral to slightly aklaine.
Bk horizons
Value: of 6 or 7 dry, 4 to 6 moist.
Chroma: 2 to 4, dry or moist.
Calcium carbonate content: 5 to 15 percent (estimated)
COMPETING SERIES: This is the Rin series. Rin soils lack secondary carbonates.
GEOGRAPHIC SETTING: Lantonia soils are on plains and have slopes of 0 to 30 percent, dominantly 2 to 10 percent. They formed in deep calcareous loess. Elevatons are 5,800 to 7,000 feet. The climate is subhumid continental having warm, dry summers and cool, moist winters. The mean annual precipitation is 15 to 18 inches. The mean annual temperature is 36 to 45 degrees F. Frost-free period is 50 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Rin and the Tetonia soils. Tetonia soils have calcic horizons at a depth of 16 to 35 inches. These soils occupy the same landscape position as Lantonia.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: These soils are used mainly for dry-farm winter wheat, barley and alfalfa. Vegetation is mainly Idaho fescue, big bluegrass, prairie junegrass, bluebunch wheatgrass, balsamroot, geranium, lupine, yarrow, and small amounts of big or three-tip sagebrush.
DISTRIBUTION AND EXTENT: Eastern Idaho and western Wyoming. The soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Teton County, Idaho, 1975.
REMARKS: Diagnostic properties recognized in the typical pedon are:
Mollic epipedon - the zone from the surface to 24 inches (Ap, A, ABt, and Bt1 horizons).
Cambic horizon - the zone from 24 to 37 inches (Bt2 and Bt3 horizons) having less than 3 percent day (absolute) than the A and ABt horizons above.
Particle-size control section - the zone from 10 to 40 inches (ABt, Bt1, Bt2, Bt3 and part of the Bk1 horizons).
Soil moisture regime - xeric.
ADDITIONAL DATA: Laboratory reference data available for this series; Pedon #89P799, sample # S89ID029-020; NSSL, Lincoln, NE, 9/90.