LOCATION WESTINDIAN ID
Established Series
IRD KA/RGK/CBR/EED
05/2018
WESTINDIAN SERIES
Landscape--hills, alluvial plains
Landform--fan remnants
Slope--0 to 20 percent
Parent material--loess-influenced mixed alluvium
Mean annual precipitation--about 360 mm
Mean annual air temperature--about 5 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--frigid
TAXONOMIC CLASS: Loamy, mixed, superactive, frigid, shallow Xeric Haplodurids
TYPICAL PEDON: Westindian loam on a 4-percent slope in an area of rangeland at an elevation of 1779 m
Ak1--0 to 5 cm; loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak very coarse granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; common very fine irregular pores; 12 percent gravel; violently effervescent (9 percent calcium carbonate); moderately alkaline (pH 8.2); abrupt wavy boundary
Ak2--5 to 25 cm; gravelly loam, brown (10YR 5/3) dry, brown (10YR 4/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and few fine roots; many very fine irregular pores; 20 percent gravel; violently effervescent (12 percent calcium carbonate); moderately alkaline (pH 8.4); clear wavy boundary
ABk--25 to 39 cm; gravelly silt loam, pale brown (10YR 6/3) dry, dark yellowish brown (10YR 4/4) moist; strong coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and few fine and medium roots; common very fine and fine tubular pores; 30 percent gravel; violently effervescent (21 percent calcium carbonate); moderately alkaline (pH 8.4); abrupt smooth boundary
2Bkqm--39 to 57 cm; strongly cemented duripan, light gray (10YR 7/2) dry, yellowish brown (10YR 5/4) moist; massive; extremely hard, extremely firm; mat of very fine roots on surface of pan; violently effervescent; clear smooth boundary
2Bk--57 to 87 cm; extremely gravelly loamy fine sand, very pale brown (10YR 7/3) dry, yellowish brown (10YR 5/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and few fine and medium roots; many very fine interstitial pores; 65 percent gravel; violently effervescent (22 percent calcium carbonate); moderately alkaline (pH 8.4); abrupt smooth boundary
3Bkqm--87 to 150 cm; indurated duripan, white (10YR 8/1) dry, light gray (10YR 7/2) moist; massive; extremely hard, extremely firm; violently effervescent
TYPE LOCATION: Clark County, Idaho; latitude 44.19378 degrees north, longitude 112.57969 degrees west, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 8 degrees C
Depth to duripan--25 to 50 cm
Particle-size control section
Clay content--5 to 17 percent
Total rock fragment content--15 to 35 percent
Ak1 horizon
Value--5 or 6 dry, 4 or 5 moist
Chroma--3 or 4 dry or moist
Calcium carbonate equivalent--5 to 15 percent
Gravel content--5 to 15 percent
Reaction--7.9 to 8.4 (moderately alkaline)
Thickness--3 to 10 cm
Ak2 horizon
Value--5 or 6 dry, 4 or 5 moist
Chroma--3 or 4 dry or moist
Texture--loam, silt loam
Calcium carbonate equivalent--5 to 15 percent
Gravel content--15 to 35 percent
Reaction--8.0 to 8.4 (moderately alkaline)
Thickness--10 to 20 cm
ABk horizon
Value--4 to 6 dry, 3 or 4 moist
Chroma--3 or 4 dry or moist
Texture--loam, silt loam
Calcium carbonate equivalent--15 to 30 percent
Gravel content--15 to 35 percent
Reaction--8.0 to 8.4 (moderately alkaline)
Thickness--10 to 14 cm
2Bk horizon
Value--7 or 8 dry, 5 to 7 moist
Chroma--1 to 3 dry, 2 to 4 moist
Texture--loamy sand, loamy fine sand
Calcium carbonate equivalent--15 to 30 percent
Gravel content--45 to 85 percent
Reaction--8.0 to 8.4 (moderately alkaline)
Thickness--30 to 36 cm
2Bkqm
Thickness--13 to 25 cm
COMPETING SERIES:
Nouque--no rock fragments
Raz--more than 20 percent clay in particle-size control section
Umil--more than 18 percent clay in particle-size control section
Weigle--duripan less than 25 cm from soil surface; bedrock within 200 cm of soil surface
GEOGRAPHIC SETTING:
Elevation--1500 to 2070 m
Climate--warm summers, cold winters
Mean annual precipitation--200 to 410 mm
Mean annual air temperature--2 to 7 degrees C
Frost-free period--70 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: None
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high in upper part, low in lower part
USE AND VEGETATION:
Major use--livestock grazing
Potential natural vegetation--low sagebrush, bluebunch wheatgrass, Idaho fescue, Sandberg bluegrass, prairie Junegrass, phlox
DISTRIBUTION AND EXTENT: Snake River Plains of MLRA 11 and Lost River Valleys and Mountains of MLRA 12 in Idaho; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clark County, Idaho; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Duripan--zone from 39 to 57 cm and 87 to 150 cm
*Particle-size control section--zone from 25 to 39 cm
National Cooperative Soil Survey
U.S.A.