LOCATION GREENBOUGH WY
Tentative Series
JSP-DPG-DEW
04/2025
GREENBOUGH SERIES
Depth class: Moderately deep
Drainage class: Well drained
Saturated hydraulic conductivity class: Moderately slow
Parent material: Slope alluvium over residuum weathered from interbedded sedimentary rock
Geomorphic location: Structural benches
Slope range: 0 to 4 percent
Mean annual temperature: 4.5 degrees C (40 degrees F)
Mean annual precipitation: 205 millimeters (8 inches)
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Sodic Ustic Haplocambids
TYPICAL PEDON: Greenbough loamy sand in rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 6 centimeters; pale brown (10YR 6/3) loamy sand, olive brown (2.5Y 4/4) moist; weak very thick platy structure; loose, nonsticky, nonplastic; many very fine and fine roots throughout; few very fine interstitial pores; 8 percent gravels, 1 percent channers; neutral (pH 7.2); clear smooth boundary.
Bw--6 to 22 centimeters; yellowish brown (10YR 5/4) sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, slightly plastic; common very fine and fine, few medium roots throughout; few very fine tubular pores; 5 percent gravels; slightly alkaline (pH 7.4); clear wavy boundary.
Bk--22 to 38 centimeters; light yellowish brown (10YR 6/4) sandy clay loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, slightly plastic; few very fine and fine roots throughout; few very fine tubular pores; 30 percent calcium carbonate concretions around rock fragments; 4 percent gravels; slightly effervescent; moderately alkaline (pH 8.2); clear wavy boundary.
BCk--38 to 60 centimeters; light yellowish brown (2.5Y 6/3) sandy clay loam, light olive brown (2.5Y 5/3) moist; weak medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; few very fine and fine roots throughout; few very fine tubular pores; 70 percent calcium carbonate concretions around rock fragments, 15 percent calcium carbonate masses in the matrix; 6 percent gravels; strongly effervescent; strongly alkaline (pH 8.5); gradual smooth boundary.
C--60 to 86 centimeters; light gray (2.5Y 7/2) sandy clay loam, light yellowish brown (10YR 6/4) moist; massive; slightly hard, friable, moderately sticky, moderately plastic; 70 percent calcium carbonate concretions on bottom of rock fragments; strongly effervescent; strongly alkaline (pH 8.6); gradual smooth boundary.
Cr--86 centimeters; interbedded sedimentary bedrock, paralithic.
TYPE LOCATION:
Sweetwater County, WY
USGS Quadrangle: Deer Butte
Latitude: 41.9024222
Longitude: -109.5615639
Datum: WGS84
Coordinates source: Hand-held GPS
RANGE IN CHARACTERISTICS:
Thickness of ochric epipedon: 3 to 10 centimeters
Depth to cambic horizon: 3 to 10 centimeters
Depth to sodic properties: 0 to 60 centimeters
Depth to bedrock: 50 to 99 centimeters
Particle-size control section (weighted averages):
Clay content-18 to 30 percent
Sand content-45 to 70 percent
Total rock fragments-9 to 31 percent
A horizon
Hue-10YR or 2.5Y
Value-6 dry; 4 moist
Chroma-3 to 5
Texture (less than 2 mm fraction)-Loamy sand
Clay content-7 to 13 percent
Rock fragments-3 to 10 percent; 3 to 8 percent gravel, 0 to 2 percent channers
Reaction-pH 7.0 to 7.4
Thickness-3 to 8 centimeters
Bw horizon
Hue-10YR
Value-5 dry, 4 moist
Chroma-3 or 4
Texture (less than 2 mm fraction)-Fine sandy loam or sandy clay loam
Clay content-17 to 24 percent
Rock fragments-2 to 5 percent gravels
Reaction-pH 7.2 to 7.6
Thickness-8 to 16 centimeters
Bk horizon
Hue-10YR
Value-6 dry, 5 moist
Chroma-4
Texture (less than 2 mm fraction)-Fine sandy loam or sandy clay loam
Clay content-16 to 23 percent
Rock fragments-2 to 5 percent gravels
Calcium carbonate equivalent-3 to 5 percent
Reaction-pH 8.0 to 8.6
Thickness-16 to 56 centimeters
BCk horizon (when present)
Hue-2.5Y
Value-6 dry, 5 moist
Chroma-4
Texture (less than 2 mm fraction)-Fine sandy loam or sandy clay loam
Clay content-19 to 27 percent
Rock fragments-1 to 6 percent gravels
Calcium carbonate equivalent-5 to 15 percent
Sodium absorption ratio-6 to 12
Reaction-pH 8.2 to 8.5
Thickness-0 to 22 centimeters
C horizon
Hue-10YR or 2.5Y
Value-7 dry; 5 or 6 moist
Chroma-3 to 5
Texture (less than 2 mm fraction)-sandy clay loam
Clay content-25 to 35 percent
Rock fragments-10 to 25 percent; 10 to 25 percent gravel
Calcium carbonate equivalent-5 to 15 percent
Sodium absorption ratio-13 to 20
Reaction-pH 8.5 to 9.0
Thickness-25 to 50 centimeters
COMPETING SERIES:
Scooby (WY) - are deep to very deep
Mullencamp (WY) - is moderately deep to lithic contact and has 35 percent or less fine sand or coarser in the control section
GEOGRAPHIC SETTING:
Parent material: Slope alluvium over residuum weathered from interbedded sedimentary rock
Landform: Structural benches
Slope: 0 to 4 percent
Mean annual temperature range: 2.5 to 7.0 degrees C (37 to 45 degrees F)
Mean annual precipitation range: 180 to 230 millimeters (7 to 9 inches)
Frost-free period: 50 to 100 days
Elevation: 1,980 to 2,030 meters (6,500 to 6,790 feet)
Climate: Long, cold winters; cool, moist springs; short, warm summers
GEOGRAPHICALLY ASSOCIATED SOILS:
None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Well drained
Saturated Hydraulic Conductivity: 1.5 to 5.0 um/sec
USE AND VEGETATION:
Greenbough soils are primarily used for rangeland. The potential native vegetation is Wyoming big sagebrush, Indian ricegrass, thickspike wheatgrass, bottlebrush squirreltail, Alkali bluegrass, and needleandthread.
DISTRIBUTION AND EXTENT:
Greenbough soils are of small extent in southwestern Wyoming; MLRA 34A.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Sweetwater County, Wyoming, 2023. Greenbough series is derived from a local landmark.
REMARKS:
Typical Pedon Taxonomic Features:
Ochric epipedon-0 to 6 centimeters (A horizon)
Cambic horizon-6 to 60 centimeters (Bw, Bk, and BCk horizons)
Secondary calcium carbonate accumulation-22 to 86 centimeters (Bk, BCk, and C horizons)
Sodic properties-60 to 86 centimeters (C horizon)
Paralithic contact-86 centimeters (Cr horizon)
Particle-size control section-25 to 86 centimeters
Taxonomic Version: Keys to Soil Taxonomy, 13th edition, (2022)
National Cooperative Soil Survey
U.S.A.