LOCATION ANTELOPECREEK WY
Tentative Series
IRD DJP/CBR
04/2020
ANTELOPECREEK SERIES
The Antelopecreek series consists of very deep, well drained soils that formed in alluvium and slope alluvium derived from sedimentary rock. These soils are on alluvial fans and fan remnants. Slopes range from 1 to 4 percent. Mean annual precipitation is about 280 mm and the mean annual air temperature is about 4.0 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Natric Haploxeralfs
TYPICAL PEDON: Antelopecreek loam in rangeland. (Colors are for dry soil unless otherwise noted).
A--0 to 7 cm; yellowish brown (10YR 5/4) loam, brown (10YR 4/3) moist; moderate medium granular structure; slightly hard, friable, moderately sticky, moderately plastic; common fine, very fine and few coarse roots; many fine irregular pores; slightly alkaline (pH 7.6); clear smooth boundary. (5 to 15 cm thick)
Bt--7 to 16 cm; brown (7.5YR 5/4) loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common fine, very fine and few coarse roots; many fine irregular pores; 5 percent distinct clay films on all faces of peds; slightly alkaline (pH 7.8); gradual smooth boundary. (7 to 24 cm thick)
Btk--16 to 32 cm; yellowish brown (10YR 5/4) clay loam, dark yellowish brown (10YR 4/4) moist; moderate coarse subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common fine and medium roots; many fine irregular pores; 10 percent distinct clay films on all faces of peds; finely disseminated carbonate; slightly effervescent; moderately alkaline (pH 8.2); gradual smooth boundary. (12 to 20 cm thick)
Btkn--32 to 78 cm; light yellowish brown (10YR 6/4) loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; few fine and medium roots; few fine irregular pores; 5 percent distinct clay films on all faces of peds; 20 percent fine carbonate masses in matrix; strongly effervescent; strongly alkaline (pH 9.0); gradual smooth boundary. (38 to 50 cm thick)
Bkn--78 to 108 cm; brownish yellow (10YR 6/6) sandy clay loam, light yellowish brown (10YR 6/4) moist; weak medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; 25 percent fine carbonate masses in matrix; violently effervescent; strongly alkaline (pH 9.0); gradual smooth boundary. (28 to 50 cm thick)
C--108 to 151 cm; brownish yellow (10YR 6/6) fine sandy loam, dark yellowish brown (10YR 4/6) moist; massive; soft, very friable, slightly sticky, slightly plastic; finely disseminated carbonate; violently effervescent; strongly alkaline (pH 8.6).
TYPE LOCATION: Lincoln County, Wyoming; USGS Sage, WY topographic quadrangle; 41 degrees 49 minutes 59.25 seconds north latitude and 110 degrees 58 minutes 51.53 seconds west longitude, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3.0 to 7.0 degrees C
Depth to argillic--5 to 15 cm
Depth to calcic horizon--66 to 107 cm
Particle-size control section (weighted averages)
Clay content--23 to 31 percent
A horizon
Hue--7.5YR or 10YR
Value--3 or 4 moist
Chroma--3 or 4
Clay content--19 to 24 percent
Reaction--pH 7.4 to 7.7
Bt horizon
Hue--7.5YR or 10YR
Value--5 or 6 dry, 4 or 5 moist
Chroma--3 or 4
Clay content--21 to 26 percent
Reaction--pH 7.6 to 8.0
Btk horizon
Hue--7.5YR or 10YR
Value--5 or 6 dry, 4 or 5 moist
Chroma--3 or 4
Texture (less than 2 mm fraction)--loam, clay loam
Clay content--22 to 33 percent
Calcium carbonate equivalent--3 to 5 percent
Reaction--pH 8.0 to 8.6
Btkn horizon
Hue--7.5YR or 10YR
Value--5 or 6 dry, 4 or 5 moist
Chroma--3 or 4
Texture (less than 2 mm fraction)--loam, clay loam
Clay content--24 to 34 percent
Calcium carbonate equivalent--5 to 15 percent
Sodium adsorption ratio: 13 to 15
Reaction--pH 8.6 to 9.2
Bkn horizon
Value--5 or 6 dry, 4 to 6 moist
Chroma--3 to 6
Clay content--22 to 28 percent
Calcium carbonate equivalent--15 to 25 percent
Sodium adsorption ratio: 13 to 15
Reaction--pH 8.6 to 9.2
C horizon
Value--5 or 6 dry, 4 to 6 moist
Chroma--4 to 6
Texture (less than 2 mm fraction)--fine sandy loam, sandy clay loam
Clay content--14 to 24 percent
Calcium carbonate equivalent--15 to 25 percent
Sodium adsorption ratio: 6 to 12
Reaction--pH 8.4 to 8.8
COMPETING SERIES: There are no competing series
GEOGRAPHIC SETTING:
Landform--alluvial fans and fan remnants
Elevation--1,890 to 1,990 meters
Slope--1 to 4 percent
Parent material--alluvium and slope alluvium derived from sedimentary rock
Climate--long, cold winters; cool moist springs; short, cool summers
Mean annual precipitation--225 to 350 mm
Mean annual air temperature--2.0 to 6.0 degrees C
Frost-free period--40 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; 5 to 15 um/sec
USE AND VEGETATION: Antelopecreek soils are primarily used for wildlife habitat and grazing. The potential native vegetation is basin big sagebrush, needle and thread, and thickspike wheatgrass.
DISTRIBUTION AND EXTENT: Antelopecreek soils are of small extent in southwestern Wyoming; MLRA 13.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Lincoln County, Wyoming, 2020. Antelopecreek series is derived from the USGS Beckwith, WY topographic quadrangle.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Ochric epipedon--0 to 7 cm (A horizon)
Argilic horizon--7 to 78 cm (Bt, Btk, and Btkn horizons)
Calcic horizon--78 to 108 cm (Bkn horizon)
Sodium accumulation--32 to 108 cm (Btkn and Bkn horizons)
Particle-size control section--7 to 57 cm
Antelopecreek soils have a frigid temperature regime and a xeric moisture regime.
Taxonomic version: Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.