LOCATION SMALL                   ID

Established Series
Rev. KA/RGK/CBR
09/2018

SMALL SERIES

Landscape--hills, alluvial plains
Landform--hillslopes
Slope--1 to 60 percent
Parent material--loess-influenced colluvium over residuum derived from rhyolite
Mean annual precipitation--about 325 mm
Mean annual air temperature--about 4.4 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Calcic Argixerolls

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

A--0 to 10 cm; dark grayish brown (10YR 4/2) gravelly silt loam, very dark brown (10YR 2/2) moist; moderate medium granular structure; soft, very friable, slightly sticky and slightly plastic; common fine and very fine roots; common very fine tubular pores; 25 percent gravel; neutral (pH 7.2); clear wavy boundary

Btk1--10 to 18 cm; brown (10YR 4/3) gravelly silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common fine and very fine and few medium roots; common very fine tubular pores; common thin clay films on ped faces and along pores; slightly effervescent (11 percent calcium carbonate equivalent); 25 percent gravel; slightly alkaline (pH 7.4); clear wavy boundary

Btk2--18 to 38 cm; yellowish brown (10YR 5/4) very gravelly loam, dark brown (10YR 3/3) moist; strong medium and fine subangular blocky structure; soft, friable, slightly sticky and plastic; common fine and very fine and few medium roots; common fine and very fine tubular pores; few thin clay films on ped faces; strongly effervescent (18 percent calcium carbonate equivalent); 40 percent gravel and 5 percent flagstones; slightly alkaline (pH 7.8); abrupt wavy boundary

Bk--38 to 56 cm; very pale brown (10YR 7/3) extremely gravelly loam, brown (10YR 5/3) moist; massive; soft, very friable, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; calcium carbonate coatings on rock fragments; violently effervescent (25 percent calcium carbonate equivalent); 60 percent gravel and 5 percent flagstones; moderately alkaline (pH 8.0)

2R--56 cm; rhyolite; calcium carbonate coatings

TYPE LOCATION: Clark County, Idaho; latitude 44.23203 degrees west, longitude 112.51092 degrees north, datum WGS 84

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.4 to 7.2 degrees C
Depth to lithic contact--50 to 100 cm
Thickness of mollic epipedon--20 to 38 cm
Depth to secondary carbonates--8 to 20 cm

Particle-size control section (weighted averages)
Clay content--18 to 27 percent
Total rock fragment content--40 to 70 percent

A horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Clay content--5 to 15 percent
Gravel content--15 to 35 percent
Reaction--pH 6.8 to 7.4
Thickness--8 to 13 cm

Btk horizon
Value--4 or 5 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Texture (less than 2-mm fraction)--loam, silt loam
Clay content--18 to 27 percent
Total rock fragment content--25 to 70 percent
Gravel content--25 to 65 percent
Flagstone content--0 to 10 percent
Calcium carbonate equivalent--10 to 40 percent
Reaction--pH 7.9 to 8.2
Thickness--28 to 45 cm

Bk horizon
Value--7 or 8 dry, 5 or 6 moist
Chroma--2 or 3 dry or moist
Clay content--7 to 15 percent
Total rock fragment content--65 to 85 percent
Gravel content--60 to 75 percent
Flagstone content--5 to 10 percent
Calcium carbonate equivalent--25 to 40 percent
Reaction--pH 8.0 to 8.4
Thickness--15 to 43 cm

COMPETING SERIES:
Amelar, Custco, Dra, Drage, Rawnjay, Remount, Scalfar, Swampydraw--very deep to lithic contact
Broad--more than 43 cm deep to secondary carbonates
Milk--more than 35 cm deep to secondary carbonates
Searla--deep and very deep to lithic contact
Sheep Creek--no calcic horizon

GEOGRAPHIC SETTING:
Elevation--1580 to 2280 m
Mean annual precipitation--200 to 575 mm
Mean annual air temperature--2.2 to 6.1 degrees C
Frost-free period--50 to 95 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 uses--rangeland, wildlife habitat
Potential natural vegetation--mountain big sagebrush, low sagebrush, Saskatoon serviceberry, bluebunch wheatgrass, Idaho fescue, arrowleaf balsamroot

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 recognized in this pedon
Mollic epipedon--zone from the surface to a depth of 38 cm (A, Btk1, and Btk2 horizons)
Argillic horizon--zone from 10 to 38 cm (Btk1 and Btk2 horizons)
Calcic horizon--zone from 38 to 56 cm (Bk horizon)
Depth to lithic contact--56 cm
Particle-size control section--zone from 10 to 38 cm (Btk1 and Btk2 horizons)

Taxonomic version--Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.