LOCATION TAN ID
Established Series
Rev. BJD/RGK/CBR
05/2018
TAN SERIES
Landscape--alluvial plains
Landform--stream terraces
Slope--0 to 2 percent
Parent material--alluvium derived from limestone
Mean annual precipitation--about 200 mm
Mean annual air temperature--about 5.6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--frigid
TAXONOMIC CLASS: Sandy-skeletal, mixed, frigid Durinodic Haplocalcids
TYPICAL PEDON: Tan gravelly loam in an area of rangeland (Colors are for dry soil unless otherwise stated.)
A--0 to 8 cm; light brownish gray (10YR 6/2) gravelly loam, dark grayish brown (10YR 4/2) moist; moderate thin platy structure; slightly hard, very friable, nonsticky and slightly plastic; common very fine and fine roots; common very fine and fine irregular pores; 15 percent gravel and 2 percent cobbles; finely disseminated calcium carbonate; slightly effervescent; slightly alkaline (7.8); clear smooth boundary
Bk--8 to 28 cm; pale brown (10YR 6/3) gravelly loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky and slightly plastic; many very fine and fine and common medium roots; common very fine interstitial pores; 20 percent gravel and 5 percent cobbles; finely disseminated calcium carbonate; strongly effervescent; moderately alkaline (pH 8.0); clear wavy boundary
Bkq1--28 to 51 cm; light gray (10YR 7/2) extremely gravelly sandy loam, grayish brown (10YR 5/2) moist; weak fine subangular blocky structure; hard, firm, brittle, nonsticky and slightly plastic; many very fine and fine and few medium roots; few very fine irregular pores; weak discontinuous cementation; 55 percent gravel and 10 percent cobbles; calcium carbonate and silica coatings 2 to 3 mm thick on bottom of rock fragments; violently effervescent; moderately alkaline (pH 8.1); clear wavy boundary
Bkq2--51 to 74 cm; light gray (10YR 7/2) extremely gravelly loamy sand, grayish brown (10YR 5/2) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and fine and few medium roots; few very fine interstitial pores; 60 percent gravel and 10 percent cobbles; calcium carbonate and silica coatings 1 to 2 mm thick bottom of rock fragments; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary
Bkq3--74 to 124 cm; light gray (10YR 7/2) extremely gravelly loamy sand, dark grayish brown (10YR 4/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few very fine and fine roots; few very fine interstitial pores; 60 percent gravel and 15 percent cobbles; calcium carbonate and silica coatings 1 to 2 mm thick on bottom of rock fragments; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary
Bkq4--124 to 150 cm; light gray (10YR 7/2) extremely gravelly loamy sand, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; few very fine roots; few very fine interstitial pores; 60 percent gravel and 10 percent cobbles; calcium carbonate and silica coatings 1 to 2 mm thick on bottom of rock fragments; violently effervescent; moderately alkaline (pH 8.2); gradual wavy boundary
TYPE LOCATION: Butte County, Idaho; latitude 43.93194 degrees north, longitude 112.70694 degrees west, datum WGS 84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5.6 to 8.3 degrees C
Depth to calcic horizon--20 to 36 cm
Particle-size control section (weighted averages)
Clay content--3 to 8 percent
Sand content--more than 50 percent fine sand or coarser throughout
Total rock fragment content--55 to 80 percent
A horizon
Value--5 or 6 dry, 4 or 5 moist
Chroma--2 or 3 dry or moist
Clay content--15 to 18 percent
Total rock fragment content--15 to 25 percent
Gravel content--15 to 20 percent
Cobble content--0 to 5 percent
Calcium carbonate equivalent--10 to 20 percent
Reaction--pH 8.0 to 8.4
Thickness--3 to 10 cm
Bk horizon
Value--5 or 6 dry, 4 or 5 moist
Chroma--2 or 3 dry or moist
Clay content--15 to 18 percent
Total rock fragment content--15 to 25 percent
Gravel content--15 to 20 percent
Cobble content--0 to 5 percent
Calcium carbonate equivalent--10 to 20 percent
Reaction--pH 8.0 to 8.4
Thickness--18 to 30 cm
Bkq1 horizon
Value--5 to 7 dry or moist
Chroma--2 or 3 dry or moist
Clay content--5 to 10 percent
Total rock fragment content--55 to 80 percent
Gravel content--50 to 65 percent
Cobble content--5 to 15 percent
Calcium carbonate equivalent--15 to 30 percent
Reaction--pH 8.1 to 8.4
Thickness--18 to 30 cm
Bkq2, Bkq3, and Bkq4 horizons
Value--6 or 7 dry, 4 or 5 moist
Chroma--2 or 3 dry or moist
Texture (less than 2-mm fraction)--loamy coarse sand, loamy sand
Clay content--3 to 8 percent
Total rock fragment content--60 to 80 percent
Gravel content--55 to 65 percent
Cobble content--5 to 15 percent
Calcium carbonate equivalent--15 to 35 percent
Reaction--pH 8.1 to 8.4
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1510 to 1650 m
Mean annual precipitation--175 to 250 mm
Mean annual air temperature--4.4 to 6.7 degrees C
Frost-free period--100 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--5 to 200 um/sec
USE AND VEGETATION:
Major uses--rangeland, wildlife habitat
Potential natural vegetation--Wyoming big sagebrush, shadscale, Indian ricegrass, needle and thread, Sandberg bluegrass, bottlebrush squirreltail, Hood's phlox
DISTRIBUTION AND EXTENT: Small extent in east-central 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
Ochric epipedon
Calcic horizon--zone from 28 to 150 cm (Bkq horizon)
Durinodic features--zone from 28 to 51 cm (Bkq1 horizon)
Particle-size control section--zone 25 to 100 cm (part of Bk horizon, Bkq1 and Bkq2 horizons, part of Bkq3 horizon)
Taxonomic version--Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.