LOCATION HOTSPOT                 ID

Established Series
IRD RWW/RGK/CBR
05/2018

HOTSPOT SERIES

Landscape--lava fields
Landform--lava flows
Slope--0 to 12 percent
Parent material--alluvium derived from basalt
Mean annual precipitation--about 350 mm
Mean annual air temperature--about 5 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Lithic Calcixerolls

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

A--0 to 13 cm; grayish brown (10YR 5/2) very gravelly loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine interstitial pores; finely disseminated calcium carbonate; 25 percent gravel, 10 percent cobbles, and 5 percent stones; slightly effervescent; slightly alkaline (pH 7.4); clear wavy boundary

Bk1--13 to 25 cm; dark grayish brown (10YR 4/2) very gravelly loam, very dark grayish brown (10YR 3/2) moist; weak very fine and fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular pores; 30 percent gravel, 15 percent cobbles, and 5 percent stones; strongly effervescent, common threadlike and irregular masses of calcium carbonate throughout; slightly alkaline (pH 7.4); clear wavy boundary

Bk2--25 to 41 cm; grayish brown (10YR 5/2) very cobbly loam, dark grayish brown (10YR 4/2) moist; weak very fine and fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular pores, 30 percent gravel, 15 percent cobbles, and 5 percent stones; violently effervescent, many threadlike and irregular masses of calcium carbonate throughout; slightly alkaline (pH 7.8)

R--41 cm; basalt

TYPE LOCATION: Clark County, Idaho; latitude 44.25230 degrees north, longitude 112.22289 degrees west, datum WGS 84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.9 to 7.2 degrees C
Depth to lithic contact--25 to 50 cm
Thickness of mollic epipedon--18 to 30 cm
Depth to calcic horizon--8 to 15 cm

Particle-size control section (weighted averages)
Clay content--15 to 25 percent
Total rock fragment content--35 to 60 percent

A horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Clay content--11 to 25 percent
Total rock fragment content--35 to 60 percent
Gravel content--15 to 25 percent
Cobble content--0 to 40 percent
Stone content--0 to 5 percent
Reaction--pH 7.4 to 7.8
Thickness--8 to 15 cm

Bk horizon
Value--4 to 7 dry, 3 to 5 moist
Chroma--2 or 3 dry or moist
Clay content--15 to 25 percent
Total rock fragment content--25 to 60 percent
Gravel content--25 to 40 percent
Cobble content--10 to 35 percent
Stone content--0 to 15 percent
Reaction--pH 7.9 to 8.4
Thickness--18 to 35 cm

COMPETING SERIES:
Lilcan--8 to 15 percent clay in particle-size control section

GEOGRAPHIC SETTING:
Elevation--1540 to 1820 m
Mean annual precipitation--300 to 525 mm
Mean annual air temperature--2.8 to 6.1 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 25 um/sec

USE AND VEGETATION:
Major use--rangeland
Potential natural vegetation--Wyoming big sagebrush, threetip sagebrush, bluebunch wheatgrass, Sandberg bluegrass, Nevada bluegrass, tapertip hawksbeard

DISTRIBUTION AND EXTENT: Small extent in eastern Idaho; MLRAs 11 and 13

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 25 cm (A and Bk1 horizons)
Calcic horizon--zone from 13 to 41 cm (Bk1 and Bk2 horizons)
Depth to lithic contact--41 cm
Particle-size control section--zone from 25 to 41 cm

Taxonomic version--Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.