LOCATION MANNS WY
Tentative Series
ALB-DPG-DEW
04/2025
MANNS SERIES
Depth class: Very shallow and Shallow
Drainage class: Well drained
Saturated hydraulic conductivity class: Moderately high
Parent Material: Slope alluvium, alluvium, or colluvium over residuum weathered from interbedded sedimentary rocks
Geomorphic location: structural benches, hillslopes, strath terraces, escarpments, cuestas, or dip slopes
Slope range: 1 to 45 percent
Mean annual temperature: 4.5 degrees C (40 degrees F)
Mean annual precipitation: 205 millimeters (8 inches)
TAXONOMIC CLASS:
Loamy-skeletal, mixed, superactive, calcareous, frigid Lithic Ustic Torriorthents
TYPICAL PEDON: Manns channery fine sandy loam in rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 7 centimeters; pale yellow (2.5Y 7/3) channery fine sandy loam, olive brown (2.5Y 4/3) moist; strong very thick platy structure; soft, very friable, slightly sticky, nonplastic; many very fine and fine roots throughout; many very fine and fine vesicular pores; 60 percent calcium carbonate concretions on bottom of rock fragments; 1 percent gravels, 1 percent flagstones, and 30 percent channers; very slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary.
C1--7 to 16 centimeters; light olive brown (2.5Y 5/4) very channery fine sandy loam, olive brown (2.5Y 4/4) moist; single grain; loose, slightly sticky, slightly plastic; many very fine and fine, and common medium roots throughout; common very fine irregular pores; 90 percent calcium carbonate concretions on bottom of rock fragments; 40 percent channers; slightly effervescent; moderately alkaline (pH 8.0); gradual smooth boundary.
C2--16 to 26 centimeters; yellowish brown (10YR 5/4) extremely channery fine sandy loam, dark yellowish brown (10YR 4/4) moist; single grain; loose, slightly sticky, nonplastic; common very fine, fine, and medium roots throughout; common very fine irregular pores; 95 percent calcium carbonate concretions on bottom of rock fragments; 40 percent channers and 25 percent parachanners; strongly effervescent; moderately alkaline (pH 8.4); abrupt smooth boundary.
R--26 centimeters; interbedded sedimentary bedrock, lithic.
TYPE LOCATION:
Sweetwater County, WY
USGS Quadrangle: Austin Ranch SW
Latitude: 41.7440500
Longitude: -109.5247083
Datum: WGS84
Coordinate source: Hand-held GPS
RANGE IN CHARACTERISTICS:
Thickness of ochric epipedon: 3 to 10 centimeters
Depth to lithic contact: 12 to 50 centimeters
Particle-size control section (weighted averages):
Clay content-9 to 28 percent
Sand content-36 to 75 percent
Total rock fragments-41 to 73 percent
A horizon:
Hue-10YR or 2.5Y
Value-5 to 8 dry; 4 or 5 moist
Chroma-2 to 4 dry; 3 to 6 moist
Texture (less than 2 mm fraction)-Sandy loam, fine sandy loam, sandy clay loam, or loam
Clay content-6 to 26 percent
Rock fragments-0 to 58 percent; 0 to 55 percent channers, 0 to 55 percent gravels, 0 to 10 percent cobbles, 0 to 13 percent flagstones
Calcium carbonate equivalent-1 to 15 percent
Sodium absorption ratio-0 to 15
Reaction-pH 7.7 to 9.0
Thickness-3 to 11 centimeters
Bk/Btk/Bkn/BC horizon(s) (when present):
Hue-10YR
Value-5 to 7 dry; 3 to 5 moist
Chroma-3 or 4 dry; 3 to 6 moist
Texture (less than 2 mm fraction)-Sandy loam, loam, fine sandy loam, sandy clay loam, clay loam, or loamy sand
Clay content-7 to 37 percent
Rock fragments-5 to 65 percent; 0 to 65 percent channers, 0 to 20 percent gravels, 0 to 15 percent flagstones
Calcium carbonate equivalent-3 to 15 percent
Sodium absorption ratio-0 to 15
Reaction-pH 7.8 to 8.8
Thickness-0 to 14 centimeters
C horizon(s):
Hue-7.5YR to 2.5Y
Value-5 to 8 dry; 4 or 5 moist
Chroma-2 to 8 dry; 3 to 6 moist
Texture (less than 2 mm fraction)-Fine sandy loam, sandy loam, loam, sandy clay loam, clay loam, or loamy sand
Clay content-5 to 35 percent
Rock fragments-20 to 85 percent; 0 to 80 percent gravels, 0 to 85 percent channers, 0 to 85 percent flagstones, 0 to 65 percent parachanners
Calcium carbonate equivalent-3 to 25 percent
Sodium absorption ratio-0 to 25
Reaction-pH 7.8 to 9.8
Thickness-8 to 41 centimeters
COMPETING SERIES:
There are no competing series.
GEOGRAPHIC SETTING:
Parent material: Slope alluvium, alluvium, or colluvium over residuum weathered from interbedded sedimentary rock
Landform: Structural benches, hillslopes, strath terraces, escarpments, cuestas, or dip slopes
Slope: 1 to 45 percent
Mean annual temperature: 2.5 to 7 degrees C (37 to 45 degrees F)
Mean annual precipitation: 180 to 230 millimeters (7 to 9 inches)
Frost-free period: 50 to 100 days
Elevation: 1,840 to 2,250 meters (6,040 to 7,380 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 m/sec
USE AND VEGETATION:
Manns soils are primarily used for rangeland. The potential native vegetation is Indian ricegrass, Wyoming big sagebrush, green rabbitbrush, thickspike wheatgrass, bottlebrush squirreltail, needle and thread, winterfat, James' galleta, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT:
Manns soils are of moderate extent in southwestern Wyoming; MLRA 34A.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Sweetwater County, WY 2022. Manns series is derived from local landmarks.
REMARKS:
Typical Pedon Taxonomic Features:
Ochric epipedon-0 to 7 centimeters (A horizon)
Depth to lithic contact-26 centimeters (R horizon)
Particle-size control section-0 to 26 centimeters
Taxonomic version: Keys to Soil Taxonomy, 13th Edition, (2022)
National Cooperative Soil Survey
U.S.A.