LOCATION LATIGO                  ID

Established Series
Rev. LAR/RGK/CBR
05/2018

LATIGO SERIES

Landscape--hills, alluvial plains
Landform--fan remnants, alluvial fans
Slope--1 to 60 percent
Parent material--loess-influenced alluvium derived from rhyolite
Mean annual precipitation--about 450 mm
Mean annual air temperature--about 3.3 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Calcic Argicryolls

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

A1--0 to 15 cm; very dark grayish brown (10YR 3/2) gravelly silt loam, very dark brown (10YR 2/2) moist; moderate medium and fine subangular blocky structure parting to moderate medium and fine granular; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine and few medium and coarse roots; common very fine and fine tubular pores; 20 percent gravel; neutral (pH 7.2); gradual wavy boundary

A2--15 to 36 cm; dark brown (10YR 3/3) very cobbly silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure parting to moderate medium and fine granular; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine and few medium and coarse roots; common very fine and fine tubular pores; 10 percent gravel and 35 percent cobbles; neutral (pH 7.2); clear wavy boundary

Bt--36 to 53 cm; yellowish brown (10YR 5/4) very gravelly silt loam, brown (10YR 4/3) moist; common fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine and fine and few medium and coarse roots; common very fine tubular pores; common faint clay films on ped faces and lining tubular pores; 40 percent gravel and 15 percent cobbles; neutral (pH 7.2); abrupt smooth boundary

Bk1--53 to 81 cm; white (10YR 8/1) very cobbly silt loam, pale brown (10YR 6/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine and few medium and coarse roots; common very fine tubular pores; violently effervescent (40 percent calcium carbonate); finely disseminated calcium carbonate; 15 percent gravel and 35 percent cobbles; moderately alkaline (pH 8.0); gradual wavy boundary

Bk2--81 to 109 cm; white (10YR 8/1) extremely cobbly sandy loam, light gray (10YR 7/2) moist; massive; slightly hard, friable, nonsticky and slightly plastic; few very fine roots; few very fine tubular pores; violently effervescent (25 percent calcium carbonate); finely disseminated calcium carbonate; 30 percent gravel and 50 percent cobbles; moderately alkaline (pH 8.0); gradual wavy boundary

Bk3--109 to 152 cm; white (10YR 8/1) extremely cobbly sandy loam, pale brown (10YR 6/3) moist; massive; slightly hard, very friable, nonsticky and nonplastic; violently effervescent (10 percent calcium carbonate); finely disseminated calcium carbonate; 30 percent gravel and 55 percent cobbles; moderately alkaline (pH 8.0)

TYPE LOCATION: Clark County, Idaho; latitude 44.38575 degrees north, longitude 112.68767 degrees west, datum WGS 84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--2.2 to 6.1 degrees C
Thickness of mollic epipedon--28 to 38 cm
Depth to argillic horizon--15 to 46 cm
Depth to calcic horizon--46 to 79 cm

Particle-size control section (weighted averages)
Clay content--20 to 26 percent
Total rock fragment content--35 to 55 percent

A horizon
Value--3 or 4 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Clay content--12 to 20 percent
Total rock fragment content--15 to 55 percent
Gravel content--10 to 30 percent
Cobble content--25 to 35 percent
Reaction--pH 6.6 to 7.3
Thickness--28 to 38 cm

Bt horizon
Hue--10YR or 7.5YR dry or moist
Value--4 to 6 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Clay content--20 to 26 percent
Total rock fragment content--35 to 55 percent
Gravel content--25 to 40 percent
Cobble content--10 to 15 percent
Reaction--pH 6.6 to 7.8
Thickness--15 to 38 cm

Bk horizon
Value--6 to 8 dry, 4 to 7 moist
Chroma--1 to 4 dry or moist
Texture (less than 2-mm fraction)--loam, silt loam, sandy loam
Clay content--8 to 26 percent
Total rock fragment content--40 to 85 percent
Gravel content--10 to 30 percent
Cobble content--30 to 55 percent
Calcium carbonate equivalent--10 to 40 percent
Reaction--pH 7.9 to 8.4

COMPETING SERIES:
Billycanyon, Brodie, Hodden, Hoodling, Maciver, Teeler, Wilhelm--ustic soil moisture regime
Cavemountain, Cowcoulee, Daisypeak, Grassyhollow--moderately deep to lithic contact
Nurkey--silt loam argillic horizon

GEOGRAPHIC SETTING:
Elevation--1670 to 2400 m
Mean annual precipitation--300 to 625 mm
Mean annual air temperature--1.7 to 5.6 degrees C
Frost-free period--30 to 60 days

GEOGRAPHICALLY ASSOCIATED SOILS: None listed

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--5 to 100 um/sec

USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--mountain big sagebrush, bluebunch wheatgrass, Idaho fescue, slender wheatgrass, arrowleaf balsamroot, basin wildrye

DISTRIBUTION AND EXTENT: Moderate 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
Mollic epipedon--zone from the surface to a depth of 36 cm (A1 and A2 horizons)
Argillic horizon--zone from 36 to 53 cm (Bt horizon)
Calcic horizon--zone from 53 to 150 cm (Bk1, Bk2, and Bk3 horizons)
Particle-size control section--zone from 36 to 53 cm

Taxonomic version--Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.