LOCATION PAINT ID
Established Series
Rev. GAH/HBM/CBR
05/2018
PAINT SERIES
Landscape--plains, alluvial plains, hills, valleys
Landform--fan remnants, outwash fans
Slope--0 to 25 percent
Parent material--alluvium derived from limestone
Mean annual precipitation--about 240 mm
Mean annual air temperature--about 4 degrees C
Depth class--shallow to a duripan
Drainage class--well drained
Soil moisture regime--aridic (torric)
Soil temperature regime--frigid
TAXONOMIC CLASS: Loamy-skeletal, carbonatic, frigid, shallow Xereptic Haplodurids
TYPICAL PEDON: Paint gravelly loam in an area of rangeland (Colors are for dry soil unless otherwise noted.)
A--0 to 8 cm; pale brown (10YR 6/3) gravelly loam, dark brown (10YR 3/3) moist; weak very fine and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine and medium roots; many very fine and few fine irregular pores; 25 percent gravel and 5 percent cobbles; calcium carbonate and silica coatings less than 2 mm thick on bottom of rock fragments; slightly effervescent (60 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear wavy boundary
Bkq1--8 to 18 cm; brown (10YR 5/3) very gravelly loam, dark brown (10YR 3/3) moist; weak very fine and fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine, medium, and coarse roots; many very fine irregular pores; 30 percent gravel and 5 percent cobbles; calcium carbonate and silica coatings less than 2 mm thick on bottom of rock fragments; strongly effervescent (50 percent calcium carbonate equivalent); moderately alkaline (pH 7.9); clear wavy boundary
Bkq2--18 to 30 cm; pale brown (10YR 6/3) very cobbly loam, dark brown (10YR 3/3) moist; weak very fine and fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine, medium, and coarse roots; many very fine irregular pores; 20 percent gravel and 15 percent cobbles; calcium carbonate and silica coatings less than 3 mm thick on bottom of rock fragments; violently effervescent (70 percent calcium carbonate equivalent); slightly alkaline (pH 7.8); abrupt wavy boundary
2Bkqm--30 to 40 cm; light gray (10YR 7/2) strongly cemented duripan that has a continuous laminar cap 1 to 2 mm thick, dark grayish brown (10YR 4/2) moist; massive; 50 percent gravel and 5 percent cobbles; calcium carbonate and silica coatings less than 2 mm thick on bottom of rock fragments; violently effervescent; strongly alkaline (pH 8.5); clear wavy boundary
2Bkqn1--40 to 64 cm; light gray (10YR 7/2) extremely gravelly loamy coarse sand, dark grayish brown (10YR 4/2) moist; single grain; loose; many very fine and few fine interstitial pores; 70 percent gravel; calcium carbonate and silica coatings on bottom of rock fragments that cement gravel and sand to coarse fragments; violently effervescent; strongly alkaline (pH 8.5); gradual wavy boundary
2Bkqn2--64 to 150 cm; light brownish gray (10YR 6/2) extremely gravelly loamy coarse sand, dark grayish brown (10YR 4/2) moist; single grain; loose; many very fine and few fine and medium interstitial pores; 60 percent gravel and 10 percent cobbles; calcium carbonate and silica coatings less than 2 mm thick on bottom of rock fragments; violently effervescent; strongly alkaline (pH 8.8)
TYPE LOCATION: Lemhi County, Idaho; latitude 44.28866 degrees north, longitude 112.97202 degrees west, datum WGS 84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.9 to 7.8 degrees C
Depth to duripan--30 to 46 cm
Particle-size control section (weighted averages)
Total clay content--12 to 18 percent
Carbonate-free clay content--2 to 10 percent
Total rock fragment content--35 to 55 percent
Calcium carbonate equivalent--25 to 39 percent
A or Ak horizon
Value--5 or 6 dry, 3 or 4 moist
Chroma--3 or 4 dry
Clay content--12 to 19 percent
Gravel content--15 to 35 percent
Calcium carbonate equivalent--25 to 70 percent
Reaction--pH 7.4 to 9.0
Thickness--5 to 13 cm
Bkq horizon
Value--5 or 6 dry, 3 or 4 moist
Chroma--3 or 4 dry
Clay content--12 to 19 percent
Total rock fragment content--35 to 55 percent
Gravel content--15 to 55 percent
Cobble content--0 to 20 percent
Calcium carbonate equivalent--40 to 70 percent
Reaction--pH 7.4 to 9.0
Thickness--15 to 36 cm
2Bkqm horizon (where present)
Value--4 to 7 dry or moist
Chroma--2 to 4 dry or moist
Clay content--0 to 6 percent
Total rock fragment content--50 to 55 percent
Gravel content--20 to 55 percent
Cobble content--0 to 6 percent
Calcium carbonate equivalent--0 to 10 percent
Reaction--pH 7.9 to 8.4
Thickness--0 to 25 cm
2Bkqmn horizon (where present)
Value--4 to 7 dry or moist
Chroma--2 to 4 dry or moist
Clay content--5 to 10 percent
Gravel content--50 to 55 percent
Calcium carbonate equivalent--50 to 70 percent
Sodium adsorption ratio--5 to 15
Reaction--pH 8.5 to 9.0
Thickness--0 to 11 cm
2Bkqn horizon
Value--6 or 7 dry
Chroma--1 to 4 moist
Texture (less than 2-mm fraction)--loamy coarse sand, sand, sandy loam
Clay content--2 to 19 percent
Total rock fragment content--40 to 85 percent
Gravel content--25 to 85 percent
Cobble content--0 to 15 percent
Calcium carbonate equivalent--35 to 70 percent
Sodium adsorption ratio--5 to 15
Reaction--pH 7.9 to 9.0
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1540 to 2200 m
Mean annual precipitation--200 to 400 mm
Mean annual air temperature--2.8 to 7.2 degrees C
Frost-free period--30 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND PERMEABILITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--5 to 25 um/sec above the duripan, 0.1 to 1.0 um/sec in the duripan, 50 to 200 um/sec below the duripan
USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--Wyoming big sagebrush, bluebunch wheatgrass
DISTRIBUTION AND EXTENT: Small extent in southeast Idaho; MLRA 12
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lemhi County, Idaho; 1999
REMARKS:
Diagnostic horizons and other features recognized in this pedon
Ochric epipedon
Calcic horizon
Duripan--zone from 30 to 40 cm (2Bkqm horizon)
Particle-size control section--zone from the surface to a depth of 30 cm (A, Bkq1, and Bkq2 horizons)
National Cooperative Soil Survey
U.S.A.