LOCATION SAWTELPEAK ID
Established Series
Rev. LAR/RGK/DJP
01/2018
SAWTELPEAK SERIES
Landscape--alluvial plains, hills
Landform--flood-plain steps
Slope--0 to 2 percent
Parent material--lacustrine deposits over alluvium
Mean annual precipitation--about 550 mm
Mean annual air temperature--about 2.8 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
TAXONOMIC CLASS: Fine, smectitic Typic Cryaquolls
TYPICAL PEDON: Sawtelpeak silty clay in meadow. (Colors are for moist soil unless otherwise stated.)
Oi--0 to 10 cm; slightly decomposed plant material; abrupt smooth boundary
A--10 to 30 cm; black (10YR 2/1) silty clay, very dark grayish brown (10YR 3/2) dry; moderate medium subangular blocky structure parting to strong fine granular; hard, firm, moderately sticky, moderately plastic; many very fine and fine roots throughout; common very fine tubular pores; neutral (pH 6.6); abrupt smooth boundary
Bg1--30 to 51 cm; dark grayish brown (10YR 4/2) silty clay loam, brown (10YR 5/3) dry; moderate medium subangular blocky structure; hard, firm, moderately sticky, moderately plastic; common very fine and fine roots throughout; common very fine tubular pores; 30 percent strong distinct black (10YR 2/1) moist iron and manganese masses; neutral (pH 6.7); abrupt wavy boundary
Bg2--51 to 56 cm; gray (5Y 5/1) silty clay, grayish brown (10YR 5/2) dry; moderate medium subangular blocky structure parting to strong fine granular; hard, firm, moderately sticky, moderately plastic; common very fine tubular pores; neutral (pH 6.8); abrupt wavy boundary
2Ab--56 to 76 cm; black (10YR 2/1) silty clay, dark grayish brown (10YR 4/2) dry; moderate medium subangular blocky structure parting to strong fine granular; hard, firm, moderately sticky, moderately plastic; common very fine and fine roots throughout; common very fine tubular pores; neutral (pH 6.9); abrupt smooth boundary
2C1--76 to 119 cm; brown (7.5YR 5/4) silty clay, light brown (7.5YR 6/4) dry; massive; hard, firm, moderately sticky, moderately plastic; 1 percent medium distinct strong brown (7.5YR 4/6) dry and 1 percent medium prominent gray (5Y 5/1) iron depletions; slightly alkaline (pH 7.4); abrupt smooth boundary
3C2--119 to 155 cm; dark yellowish brown (10YR 4/4) very gravelly sandy loam, very pale brown (10YR 7/4) dry; massive; slightly hard, friable, slightly sticky, slightly plastic; 1 percent medium distinct strong brown (7.5YR 4/6) iron masses; 35 percent gravel; slightly alkaline (pH 7.7); abrupt smooth boundary
3C3--155 to 163 cm; dark yellowish brown (10YR 4/4) very gravelly coarse sandy loam, very pale brown (10YR 7/4) dry; massive; soft, friable; nonsticky, nonplastic; 40 percent gravel; slightly alkaline (pH 7.7)
TYPE LOCATION: Fremont County, Idaho; 44 degrees 34 minutes 29.5 seconds north latitude and 111 degrees 18 minutes 58.89 seconds west longitude, datum WGS 84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--2.2 to 3.9 degrees C.
Thickness of mollic epipedon--20 to 38 cm
Depth to seasonal high water table--30 to 50 cm
Depth to skeletal substratum--100 to 150 cm
Linear extensibility percent--average less than 6.0 between 0 to 100 cm
Particle-size control section (weighted averages)
Clay content--35 to 45 percent
Oi (when present)
Texture--slightly decomposed plant material
Reaction--pH 4.0 to 5.5
Organic matter content--60 to 95 percent
Thickness--0 to 13 cm
A horizon
Value--2 to 4 dry, 2 or 3 moist
Chroma--1 to 3 dry or moist
Clay content--40 to 50 percent
Reaction--pH 6.1 to 7.3
Thickness--10 to 38 cm
Bg1 and Bg2 horizons
Hue--10YR to 5Y, dry or moist
Value--4 to 6 dry, 2 to 5 moist
Chroma--1 to 3 dry or moist
Texture (less than 2 mm fraction)--silty clay loam, clay or silty clay
Clay content--35 to 50 percent
Reaction--pH 6.5 to 7.8
Thickness--18 to 90 cm
2Ab horizon (when present)
Value--3 or 4 dry
Texture (less than 2 mm fraction)--silty clay or silty clay loam
Clay content--35 to 50 percent
Reaction--pH 6.6 to 7.2
Thickness--0 to 20 cm
2C1 horizon
Hue--7.5YR to 5Y dry or moist
Value--4 to 7 dry, 2 to 6 moist
Chroma--1 to 6 dry or moist
Texture (less than 2 mm fraction)--silty clay or silty clay loam
Clay content--35 to 50 percent
Reaction--pH 7.2 to 7.8
Thickness--41 to 71 cm
3C2 and 3C3 horizons
Hue--7.5YR to 2.5Y
Value--4 to 7 dry, 2 to 6 moist
Chroma--1 to 6 dry or moist
Texture (less than 2 mm fraction)--fine sandy loam, sandy loam, or coarse sandy loam
Clay content--2 to 20 percent
Rock fragments--35 to 55 percent gravel
Reaction--pH 7.2 to 7.8
COMPETING SERIES:
Cabarton (ID)--have an ash layer from 25 to 36 cm
Medicinelodge (MT)--do not have lithologic discontinuities
Saladon (NM)--are very poorly drained and lack a cambic horizon
GEOGRAPHIC SETTING:
Elevation - 1,950 to 2,050 meters
Mean annual precipitation - 450 to 675 mm
Mean annual air temperature - 1.7 to 3.3 degrees C.
Frost free period - 30 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained, 0.1 to 5.0 um/sec in the upper part and 10.0 to 150.0 um/sec in the lower gravel horizons.
USE AND VEGETATION: Sawtelpeak soils are primarily used for rangeland. The potential native vegetation is Nebraska sedge, Nevada bluegrass, meadow barley, clover, aster, and timothy.
DISTRIBUTION AND EXTENT: Sawtelpeak soils are of small extent in southeastern Idaho; MLRAs 13 and 43B.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Fremont County, Idaho, 1989
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon--10 to 30 cm (A horizon)
Cambic horizon--30 to 56 cm (Bg1 and Bg2 horizons)
Particle-size control section--35 to 110 cm (part of the Bg1, Bg2, 2Ab, and part of the 2C1 horizon)
Taxonomic version--Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.