LOCATION ALLHANDS                ID

Established Series
IRD GAH/RGK/CBR
05/2018

ALLHANDS SERIES

Landscape--alluvial plains
Landform--fan remnant
Slope--1 to 4 percent
Parent material--alluvium derived from limestone
Mean annual precipitation--about 250 mm
Mean annual air temperature--about 4 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--frigid

TAXONOMIC CLASS: Loamy-skeletal, carbonatic, frigid, shallow Cambidic Haplodurids

TYPICAL PEDON: Allhands gravelly loam in an area of rangeland (Colors are for dry soil unless otherwise noted.)

Ak--0 to 10 cm; very pale brown (10YR 7/3) gravelly loam, brown (10YR 4/3) moist; moderate thick platy structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular pores; 15 percent gravel and 2 percent cobbles; slightly effervescent (40 percent calcium carbonate equivalent); moderately alkaline (pH 7.9); clear smooth boundary.

Bk--10 to 33 cm; light brownish gray (10YR 6/2) gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; many very fine and fine roots; common very fine tubular pores; 35 percent gravel and 20 percent cobbles; calcium carbonate coatings on bottom of rock fragments; strongly effervescent (55 percent calcium carbonate equivalent); moderately alkaline (pH 7.9); clear smooth boundary.

Bkqm1--33 to 38 cm; very pale brown (10YR 8/2) strongly cemented duripan that has a continuous laminar cap less than 1 mm thick, grayish brown (10YR 5/2) moist; massive; very hard, very firm; 40 percent gravel and 45 percent cobbles; calcium carbonate coatings, silica coatings, and pendular calcium carbonate nodules on bottom of rock fragments; violently effervescent; moderately alkaline (pH 7.9); gradual wavy boundary.

Bkqm2--38 to 100 cm; light brownish gray (10YR 6/2) weakly cemented duripan consisting of extremely cobbly sandy loam, light grayish brown (10YR 5/2) moist; massive, hard, firm, nonsticky and nonplastic; common very fine and few fine and medium roots; common fine irregular pores; 45 percent gravel and 40 percent cobbles; calcium carbonate and silica coatings and pendants on bottom of rock fragments; violently effervescent (55 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); gradual wavy boundary.

BCk--100 to 150 cm; light brownish gray (10YR 6/2) extremely cobbly loamy sand, very dark grayish brown (10YR 3/2) moist; massive, hard, firm, nonsticky and nonplastic; few very fine and fine roots; few fine irregular pores; 40 percent gravel and 40 percent cobbles; calcium carbonate coatings on bottom of rock fragments; strongly effervescent (40 percent calcium carbonate equivalent); moderately alkaline (pH 8.0).

TYPE LOCATION: Clark County, Idaho; latitude 44.35000 degrees north and longitude 112.77028 degrees west; WGS 84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.9 to 7.2 degrees C
Depth to strongly cemented duripan--25 to 50 cm

Particle-size control section (weighted averages)
Clay content--10 to 18 percent
Total rock fragment content--40 to 60 percent
Calcium carbonate equivalent--40 to 60 percent

Ak horizon
Value--5 to 7 dry, 3 to 5 moist
Chroma--2 or 3 dry or moist
Clay content--15 to 20 percent
Total rock fragment content--15 to 25 percent
Gravel content--15 to 25 percent
Cobble content--0 to 5 percent
Calcium carbonate equivalent--30 to 50 percent
Reaction--pH 7.9 to 8.0
Thickness--5 to 18 cm

Bk horizon
Value--5 to 7 dry, 3 to 6 moist
Chroma--2 or 3 dry or moist
Texture (less than 2-mm fraction)--loam, sandy loam
Clay content--10 to 18 percent
Total rock fragment content--35 to 60 percent
Gravel content--15 to 40 percent
Cobble content--0 to 20 percent
Reaction--pH 7.9 to 8.0
Thickness--20 to 32 cm

Bkqm horizon
Value--6 to 8 dry, 4 to 6 moist
Chroma--2 or 3 dry or moist
Texture (less than 2-mm fraction)--loam, loamy coarse sand, sandy loam
Clay content--10 to 18 percent
Total rock fragment content--40 to 90 percent
Gravel content--40 to 85 percent
Cobble content--0 to 45 percent
Calcium carbonate equivalent--40 to 70 percent
Reaction--pH 8.0 to 8.4
Thickness--34 to 110 cm

Bk horizon (where present)
Value--5 to 7 dry, 3 to 5 moist
Chroma--2 or 3 dry or moist
Texture (less than 2-mm fraction)--loamy sand
Clay content--3 to 10 percent
Total rock fragment content--80 to 90 percent
Gravel content--40 to 80 percent
Cobble content--0 to 50 percent
Calcium carbonate equivalent--30 to 50 percent
Reaction--pH 7.9 to 8.4

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--1540 to 1620 m
Mean annual precipitation--200 to 325 mm
Mean annual air temperature--2.8 to 5.6 degrees C
Frost-free period--80 to 100 days

GEOGRAPHICALLY ASSOCIATED SOILS: None listed

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--5 to 100 um/sec above the duripan, 0.01 to 1.00 um/sec in the duripan

USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--low sagebrush, bluebunch wheatgrass, shadscale saltbush, Indian ricegrass, needle and thread, bottlebrush squirreltail, Sandberg bluegrass, phlox, prickly pear cactus

DISTRIBUTION AND EXTENT: Small extent in eastern Idaho; MLRA 12

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Clark County, Idaho; 2018

REMARKS:
Diagnostic horizons and other features in this pedon
Ochric epipedon
Duripan--zone from 33 to 100 cm
Calcic horizon--zone from 33 to 150 cm
Particle-size control section--zone from the surface to a depth of 33 cm

Taxonomic version--Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.