LOCATION LABARGE WY
Tentative Series
DPG/DJP/CBR
05/2020
LABARGE SERIES
The Labarge series consists of very deep, somewhat poorly drained soils that formed alluvium derived from interbedded sedimentary rock. These soils are on floodplains and floodplain steps. Slopes are 0 to 2 percent. Mean annual precipitation is about 205 mm and mean annual air temperature is about 4.5 degrees C.
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Ustic Aquicambids
TYPICAL PEDON: Labarge loam in grass/herbaceous cover. (Colors are for moist soil unless otherwise noted.)
Oe--0 to 2 cm; moderately decomposed plant material; clear smooth boundary (0 to 7 cm thick)
A--2 to 6 cm; very dark grayish brown (10YR 3/2) loam, dark grayish brown (10YR 4/2) dry; weak fine granular structure; very friable, soft, moderately sticky, moderately plastic; many very fine and fine roots; many fine tubular pores; finely disseminated carbonates; slightly effervescent; slightly alkaline (pH 7.6); clear smooth boundary. (3 to 8 cm thick)
Bk--6 to 37 cm; dark grayish brown (10YR 4/2) sandy clay loam, grayish brown (10YR 5/2), dry; moderate medium subangular blocky structure; friable, slightly hard, moderately sticky, moderately plastic; many very fine and fine roots; many fine tubular pores; 2 percent dark yellowish brown (10YR 4/6) redox concentrations; finely disseminated carbonate; slightly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (10 to 45 cm thick)
C1--37 to 75 cm; brown (10YR 4/3) sandy loam, brown (10YR 5/3) dry; massive; friable, slightly hard, slightly sticky, slightly plastic; common fine roots; 15 percent dark yellowish brown (10YR 4/6) redox concentrations; finely disseminated carbonate; strongly effervescent; moderately alkaline (pH 8.2) ; clear smooth boundary. (20 to 50 cm thick)
C2--75 to 200 cm; brown (10YR 5/3) very gravelly loamy coarse sand, pale brown (10YR 6/3), dry; single grain; loose, nonsticky, nonplastic; 15 percent dark yellowish brown (10YR 4/6) redox concentrations; 25 percent grayish brown (10YR 5/2) redox depletions; finely disseminated carbonate; 30 percent gravel, 10 percent cobbles; slightly effervescent; slightly alkaline (pH 7.6).
TYPE LOCATION: Sublette County, Wyoming; USGS La Barge topographic quadrangle; latitude 42 degrees 17 minutes 13 seconds north, longitude 110 degrees 11 minutes 15 seconds west, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.5 to 8.0 degrees C
Depth to water table--45 to 90 cm
Particle-size control section (weighted averages):
Clay content--11 to 15 percent
Total rock fragments--0 to 13 percent
Oe (when present)
Texture--moderately decomposed plant material
Reaction--pH 4.5 to 5.5
Organic matter content--55 to 90 percent
A horizon
Hue--10YR or 2.5Y
Value--4 or 5
Chroma--2 or 3
Texture (less than 2 mm fraction)--loam, clay loam
Clay content--18 to 34 percent
Rock fragments--0 to 5 percent gravel
Reaction--pH 7.4 to 8.4
Bk horizon
Hue--10YR or 2.5Y
Value--4 or 5
Chroma--2 to 4
Texture (less than 2 mm fraction)--sandy clay loam, loam, sandy loam, clay loam
Clay content--18 to 28 percent
Rock fragments--0 to 5 percent gravels
Calcium carbonate equivalent--2 to 8 percent
Reaction--pH 7.9 to 8.4
C1 horizon
Hue--10YR or 2.5Y
Value--4 or 5
Chroma--2 to 4
Texture (less than 2 mm fraction)--sandy loam, fine sandy loam
Clay content--10 to 18 percent
Rock fragments--0 to 5 percent gravels
Reaction--pH 7.9 to 8.4
C2 horizon
Hue--10YR or 2.5Y
Value--5 or 6
Chroma--3 or 4
Texture (less than 2 mm fraction)--coarse sand, sand, loamy coarse sand
Clay content--1 to 8 percent
Rock fragments--35 to 65 percent--30 to 55 percent gravel; 2 to 15 percent cobbles
Reaction--pH 7.0 to 7.8
COMPETING SERIES:
There are no competing series.
GEOGRAPHIC SETTING:
Landform--Floodplains, floodplain steps
Elevation--1,950 to 2,190 meters
Slope--0 to 2 percent
Parent material--Alluvium derived from interbedded sedimentary rock
Climate--long, cold winters; cool, moist springs; short, warm summers
Mean annual precipitation--175 to 250 mm
Mean annual air temperature--2.5 to 7.0 degrees C
Frost-free period--50 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: somewhat poorly drained; 5.0 to 50 um/sec.
USE AND VEGETATION: Labarge soils are primarily used for irrigated hay land. The potential native vegetation is basin wildrye, thickspike wheatgrass, needle and thread, Letterman's needlegrass and other sedges, rushes, and forbs.
DISTRIBUTION AND EXTENT: Labarge soils are of small extent in western Wyoming; MLRA 34A.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Sublette County, Wyoming, 2019. The Labarge series name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Ochric epipedon--0 to 6 cm (A horizon)
Cambic horizon--6 to 37 cm (Bw horizon)
Redoximorphic features--6 to 200 cm (Bw and C horizons)
Particle-size control section--27 to 102 cm
Labarge soils have a frigid temperature regime and an aridic moisture regime bordering on ustic.
Taxonomic version: Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.