LOCATION JACOBY ID
Established Series
Rev. RG/WGH/RGK/CBR
05/2018
JACOBY SERIES
Landscape--lava fields
Landform--lava flows
Slope--0 to 8 percent
Parent material--eolian deposits over basalt
Mean annual precipitation--about 350 mm
Mean annual air temperature--about 5.6 degrees C
Depth class--deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Calcic Haploxerolls
TYPICAL PEDON: Jacoby fine sandy loam under shrubs (Colors are for dry soil unless otherwise noted.)
A1--0 to 5 cm; brown (10YR 4/3) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; few very fine and fine vesicular pores; 5 percent gravel; slightly acid (pH 6.4); clear smooth boundary
A2--5 to 15 cm; brown (10YR 4/3) fine sandy loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine and few medium roots; few very fine and fine vesicular pores; 5 percent gravel; neutral (pH 7.3); abrupt smooth boundary
ABk--15 to 28 cm; brown (10YR 4/3) fine sandy loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine and fine vesicular pores; finely disseminated calcium carbonate throughout and 1 percent fine weakly cemented calcium carbonate nodules in matrix; slightly effervescent (11 percent calcium carbonate equivalent); 10 percent gravel; slightly alkaline (pH 7.6); abrupt smooth boundary
Bk1--28 to 41 cm; brown (10YR 5/3) loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure parting to strong fine subangular blocky; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; few very fine and fine vesicular pores; finely disseminated calcium carbonate throughout and 9 percent fine, medium, and coarse moderately cemented calcium carbonate nodules in matrix; violently effervescent (28 percent calcium carbonate equivalent); 12 percent gravel; slightly alkaline (pH 7.7); clear wavy boundary
Bk2--41 to 102 cm; light gray (10YR 7/2) gravelly loam, pale brown (10YR 6/3) moist; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; few very fine and fine vesicular pores; finely disseminated calcium carbonate throughout, calcium carbonate coatings less than 1 mm thick on faces of peds and around rock fragments, and 9 percent fine, medium, and coarse moderately cemented calcium carbonate nodules in matrix; violently effervescent (30 percent calcium carbonate equivalent); 18 percent gravel; slightly alkaline (pH 7.7); clear wavy boundary
Bkq--102 to 150 cm; light gray (10YR 7/2) extremely gravelly sandy loam, pale brown (10YR 6/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine vesicular pores; calcium carbonate and silica coatings 1 to 3 mm thick around rock fragments and 30 percent fine, medium, and coarse irregular moderately cemented calcium carbonate nodules in matrix; violently effervescent (27 percent calcium carbonate equivalent); 50 percent gravel and 20 percent cobbles; strongly alkaline (pH 8.8); gradual wavy boundary
2R--150 cm; vesicular basalt
TYPE LOCATION: Clark County, Idaho; latitude 44.18478 degrees north, longitude 112.03478 degrees west, datum WGS 84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5.0 to 7.2 degrees C
Depth to bedrock--100 to 150 cm
Thickness of mollic epipedon--28 to 36 cm
Depth to calcic horizon--5 to 20 cm
Particle-size control section (weighted averages)
Total clay content--15 to 20 percent
Carbonate clay content--2 to 10 percent
Non-carbonate clay content--8 to 12 percent
Total rock fragment content--5 to 20 percent
A horizon
Value--4 or 5 dry
Chroma--2 or 3 dry or moist
Total clay content--12 to 16 percent
Gravel content--0 to 5 percent
Reaction--pH 6.3 to 7.3
Thickness--5 to 20 cm
ABk horizon
Value--4 to 7 dry, 3 or 4 moist
Chroma--2 or 3 moist
Texture (less than 2-mm fraction)--fine sandy loam, loam
Gravel content--0 to 10 percent
Calcium carbonate equivalent--5 to 15 percent
Content of weakly cemented cicada nodules--5 to 10 percent
Reaction--pH 7.9 to 8.4
Thickness--13 to 18 cm
Bk horizon
Value--5 to 8 dry, 4 to 7 moist
Chroma--2 or 3 dry or moist
Total clay content--12 to 18 percent
Gravel content--0 to 20 percent
Calcium carbonate equivalent--15 to 50 percent, weighted average of 25 to 40 percent
Content of moderately cemented cicada nodules--5 to 10 percent
Reaction--pH 7.9 to 8.4
Thickness--47 to 99 cm
Bkq horizon
Hue--2.5Y or 10YR dry or moist
Value--6 or 7 dry or moist
Chroma--2 or 3 dry or moist
Total rock fragment content--5 to 70 percent
Gravel content--0 to 50 percent
Cobble content--5 to 20 percent
Content of moderately cemented cicada nodules--25 to 45 percent
Calcium carbonate equivalent--15 to 50 percent, weighted average of 25 to 40 percent
Reaction--pH 8.2 to 8.4
Thickness--35 to 48 cm
COMPETING SERIES:
Arbone,
Blacknoll--very deep
Kackley,
Kearl--moderately deep to lithic contact
GEOGRAPHIC SETTING:
Elevation--1550 to 1770 m
Mean annual precipitation--300 to 425 mm
Mean annual air temperature--3.9 to 6.7 degrees C
Frost-free period--70 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--5 to 50 um/sec
USE AND VEGETATION:
Major uses--rangeland, wildlife habitat
Potential natural vegetation--threetip sagebrush, Wyoming big sagebrush, twisted leaf rabbitbrush, antelope bitterbrush, bluebunch wheatgrass, Nevada bluegrass, Sandberg bluegrass, needle and thread, prairie Junegrass, Hood's phlox, bushy bird's-beak, horsebrush
DISTRIBUTION AND EXTENT: Moderate extent in eastern Idaho; MLRA 11
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clark County, Idaho; 1959
REMARKS:
Diagnostic horizons and other features in this pedon
Mollic epipedon--zone from the surface to a depth of 28 cm (A1, A2, and ABk horizons)
Calcic horizon--zone from 15 to 150 cm (ABk, Bk1, Bk2, and Bkq horizons)
Depth to lithic contact--150 cm (2R horizon)
Particle-size control section-- zone from 25 to 100 cm
Based on the final mapping extent, the type location was moved in 2008 from north of Dubois to the current location. This location better reflects the concept of the series, which includes a profile that is deep to basalt and has carbonate nodules.
Taxonomic version--Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.