LOCATION MILLERDITCH IDEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Aquic Calcixerolls
TYPICAL PEDON: Millerditch silty clay loam, pastureland. When described on September 13, 1991 the soil was slightly moist throughout. When re-described on May 8, 2002 the soil was moist to 25 inches and saturated below 25 inches. (Colors are for dry soil unless otherwise noted.)
Ak1--0 to 1 inches; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate very fine and fine granular structure; soft, very friable, slightly sticky and slightly plastic; common very fine and coarse roots; common very fine irregular pores; strongly effervescent (15 percent calcium carbonate equivalent); disseminated lime and lime segregated into few fine rounded soft masses; slightly alkaline (pH 7.6); abrupt smooth boundary.
Ak2--1 to 8 inches; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium granular structure; very hard, friable, moderately sticky and moderately plastic; common very fine, fine and medium roots; common very fine tubular pores; strongly effervescent (16 percent calcium carbonate equivalent); disseminated lime and lime segregated into few fine rounded and irregular soft masses; slightly alkaline (pH 7.8); abrupt wavy boundary. (combined thickness of the Ak horizons is 7 to 12 inches)
Bk1--8 to 11 inches; light gray (10YR 7/2) silt loam, grayish brown (10YR 5/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; common very fine, fine, and coarse roots; common very fine tubular pores; strongly effervescent (18 percent calcium carbonate equivalent); disseminated lime and lime segregated into few fine irregular and rounded soft masses; moderately alkaline (pH 8.2); abrupt wavy boundary. (3 to 12 inches thick)
Bk2--11 to 15 inches; light gray (10YR 7/2) loam, grayish brown (10YR 5/2) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots; few very fine irregular pores; strongly effervescent (16 percent calcium carbonate equivalent); disseminated lime and lime segregated into few fine rounded soft masses; moderately alkaline (pH 8.4); clear wavy boundary. (4 to 17 inches thick)
Bk3--15 to 29 inches; light gray (10YR 7/2) fine sandy loam, brown (10YR 5/3) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few very fine roots; common very fine irregular and tubular pores; strongly effervescent (14 percent calcium carbonate equivalent); disseminated lime and lime segregated into few fine rounded soft masses; common very fine shell fragments; moderately alkaline (pH 8.4); abrupt wavy boundary. (0 to 14 inches thick)
Cg1--29 to 45 inches; light brownish gray (10YR 6/2) sandy loam, brown (10YR 4/3) moist; common fine prominent strong brown (7.5YR 4/6) redox concentrations, common fine prominent dark gray (5Y 4/1) moist redox depletions; massive; few very fine roots; few very fine tubular and common very fine irregular pores; few fine prominent black (N 2/) iron-manganese masses; slightly effervescent (11 percent calcium carbonate equivalent); disseminated lime; common very fine shell fragments; slightly alkaline (pH 7.8); gradual wavy boundary. (9 to 25 inches thick)
2Cg2--45 to 53 inches; light brownish gray (10YR 6/2) loamy sand, dark grayish brown (10YR 4/2) moist; common medium prominent strong brown (7.5YR 4/6) moist redox concentrations; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; common very fine irregular pores; few fine prominent black (N 2/) iron-manganese masses; slightly effervescent (5 percent calcium carbonate equivalent); disseminated lime; common very fine shell fragments; slightly alkaline (pH 7.8); abrupt wavy boundary. (0 to 10 inches thick)
2Agb--53 to 61 inches; grayish brown (2.5Y 5/2) sandy loam, very dark grayish brown (2.5Y 3/2) moist; many coarse prominent brown (7.5YR 4/4) moist redox concentrations; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; few very fine irregular pores; slightly effervescent (12 percent calcium carbonate equivalent); disseminated lime; common very fine shell fragments; slightly alkaline (pH 7.6).
TYPE LOCATION: Bear Lake County, Idaho; about 5 miles east of Dingle, Idaho; about 1,650 feet south and 500 feet east of the northwest corner, sec. 12, T.15 S., R.45 E. Latitude - 42 degrees, 8 minutes, 6 seconds north. Longitude - 111 degrees, 8 minutes, 51 seconds west.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 7 to 12 inches
Depth to calcic horizon - 0 to 8 inches
Calcium carbonate equivalent of calcic horizon - 15 to 30 percent
Depth to redox features - 20 to 30 inches
Depth to seasonal high water table - 20 to 30 inches December through May
Average annual soil temperature - 41 to 44 degrees F.
Particle-size control section
Clay content - averages 6 to 18 percent
Absent in some pedons
Ak2 horizon
Ak horizons
Hue - 10YR
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 through 3 dry and moist
Texture - silt loam, silty clay loam, silty clay
Clay content - 25 to 45 percent
Reaction - slightly or moderately alkaline
Rock fragments - 0 to 2 percent
Bk horizons
Hue - 10YR or 7.5YR
Value - 6 or 7 dry, 4 through 6 moist
Chroma - 1 through 3 dry and moist
Texture - very fine sandy loam, fine sandy loam, loam, silt loam, silty clay loam, clay loam (may be stratified)
Clay content - 10 to 30 percent (clay content decreases with depth)
Reaction - slightly to strongly alkaline
Rock fragments - 0 to 2 percent
Cg1 and 2Cg2 horizons (2Cg2 horizon absent in some pedons)
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 3 through 5 moist
Chroma - 2 or 3 dry and moist
Texture ? sandy loam, very fine sand, fine sand, sand, loamy very fine sand,
loamy fine sand, loamy sand (may contain thin strata of loam textures)
Clay content - 0 to 15 percent
Reaction - slightly alkaline
Rock fragments - 0 to 2 percent
2Agb
Hue - 10YR or 2.5Y
Value - 5 through 7 dry, 3 through 5 moist
Chroma - 2 or 3 dry and moist
Texture - fine sand, sand, loamy fine sand, loamy sand, sandy
loam, loam or their gravelly analogues (may be stratified)
Clay content - 0 to 15 percent
Reaction - slightly alkaline
Rock fragment content - 0 to 30 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Millerditch soils are on low stream terraces and undulating flood plains. They have slopes of 0 to 4 percent. They formed in stratified alluvium. The average annual precipitation ranges from 12 to 16 inches, and the average annual temperature ranges from 39 to 43 degrees F. The frost-free season is about 70 to 90 days. Elevations are 5,800 to 6,250 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bear Lake, Blackotter (T), Cookcan (T), Lago, Nuffer (T) and Ream series. Bear Lake soils are poor or very poorly drained, occur on similar or slightly lower concave positions and have a fine-silty control section. Blackotter soils are poorly drained, occur on slightly lower landscape positions and have a coarse-silty over sandy or sandy-skeletal control section. Cookcan soils are poorly drained and occur slightly lower concave positions. Lago soils occur on similar landscape positions and have a fine-silty control section. Nuffer soils occur on similar landscape positions, have a mollic epipedon greater than 20 inches thick and have a loamy-skeletal control section. Ream soils are moderately well drained and occur on higher landscape positions.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow or very slow runoff; moderate permeability; occasional or rare flooding for brief periods April through June.
USE AND VEGETATION: Used mainly for hayland or meadow pasture. Vegetation is mainly Nebraska sedge, sedges, willows, tufted hairgrass, and slender wheatgrass
DISTRIBUTION AND EXTENT: This soil is of small extent in southern Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bear Lake County, Idaho, 2008.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 8 inches (the Ak1 and Ak2 horizons).
Calcic horizon - The zone from the soil surface to 15 inches (the Ak1, Ak2, Bk1 and Bk2 horizons)
Particle-size control section - the zone from 10 inches to 40 inches (part of the Bk1 horizon, the Bk2, Bk3 and part of the Cg1 horizons).
ADDITIONAL DATA: This soil was sampled for the NSSL Lincoln, NE (partial characterization). Idaho sample number S91ID007002. NSSL project number RP92-ID027, sample numbers 92P-881 - 92P-888.