LOCATION DAMPE WY
Tentative Series
Rev. KCC-DJP-RJS
04/2017
DAMPE SERIES
The Dampe series consists of very deep, very poorly drained soils that formed in alluvium. These soils are on oxbows and flood plains. Slopes are 0 to 2 percent. Mean annual precipitation is about 280 mm and annual air temperature is about 4.0 degrees C.
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, calcareous, frigid Mollic Fluvaquents
TYPICAL PEDON: Dampe loam, in pasture (colors are for moist soil unless otherwise noted).
A--0 to 17 cm; very dark grayish brown (10YR 3/2) loam, brown (10YR 4/3) dry; weak medium granular structure; soft, very friable, moderately sticky, moderately plastic; many very fine, fine and medium, and few coarse roots; many interstitial pores; very slightly effervescent; slightly alkaline (pH 7.8); clear smooth boundary. (4 to 17 cm thick)
C1--17 to 37 cm; dark grayish brown (10YR 4/2) clay loam, brown (10YR 5/3) dry; massive; moderately hard, firm, very sticky, very plastic; common very fine, fine, and medium and few coarse roots; many interstitial pores; 10 percent distinct dark yellowish brown (10YR 3/6) masses of oxidized iron; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (15 to 25 cm thick)
C2--37 to 60 cm; dark grayish brown (10YR 4/2) sandy loam, brown (10YR 5/3) dry; massive; soft, very friable, slightly sticky, slightly plastic; few medium roots; many interstitial pores; 5 percent manganese masses and 20 percent distinct dark yellowish brown (10YR 3/6) masses of oxidized iron; very slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (20 to 30 cm thick)
Cg1--60 to 90 cm; very dark grayish brown (10YR 3/2) sand, brown (10YR 4/3) dry; single grain; loose, nonsticky, nonplastic; many interstitial pores; 10 percent manganese masses and 25 percent distinct dark yellowish brown (10YR 3/6), moist, masses of oxidized iron; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary.
2Cg2--90 to 100 cm; very dark grayish brown (10YR 3/2) sandy clay, brown (10YR 4/3) dry; massive; moderately hard, firm, very sticky, very plastic; common interstitial pores; 20 percent manganese masses and 30 percent prominent dark yellowish brown (10YR 3/6), moist, masses of oxidized iron; slightly effervescent; slightly alkaline (pH 7.8); clear smooth boundary.
3Cg3--100 to 155 cm; dark grayish brown (10YR 4/2) loamy sand, brown (10YR 5/3) dry; single grain; loose, nonsticky, nonplastic; common interstitial pores; 20 percent manganese masses and 35 percent prominent dark yellowish brown (10YR 3/6) moist, masses of oxidized iron; very slightly effervescent; slightly alkaline (pH 7.8). (combined thickness of Cg1, 2Cg2 and 3Cg3 greater than 85 cm)
TYPE LOCATION: Lincoln County, Wyoming; USGS Beckwith, Wyoming topographic quadrangle; 41 degrees 54 minutes 55.33 seconds north latitude and 110 degrees 59 minutes 14.37 seconds west longitude.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 3.0 to 7.0 degrees C.
Depth to a seasonally high water table and redoximorphic features: 0 to 30 cm
Oe horizon (if present)
Thickness: 0 to 5 cm
A horizon
Hue: 5YR to 10YR dry or moist
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3 dry or moist
Clay content: 15 to 25 percent
Calcium carbonate equivalent: 1 to 3 percent
Reaction: pH 7.6 to 8.0
C1 horizon
Hue: 5YR to 10YR dry or moist
Value: 4 to 7 dry; 3 or 4 moist
Chroma: 2 or 3 dry or moist
Texture (less than 2 mm): loam, sandy loam
Clay content: 30 to 39 percent
Calcium carbonate equivalent: 1 to 3 percent
Reaction: pH 7.6 to 8.2
C2 horizon
Hue: 5YR to 10YR dry or moist
Value: 4 to 7 dry; 3 or 4 moist
Chroma: 2 or 3 dry; 1 or 2 moist
Clay content: 10 to 18 percent
Calcium carbonate equivalent: 1 to 3 percent
Reaction: pH 7.6 to 8.2
Cg1 2Cg2, 3Cg3 horizons
Hue: 5YR to 10YR dry or moist
Value: 4 to 6 dry; 3 or 4 moist
Chroma: 3 or 4 dry; 1 or 2 moist
Texture (less than 2 mm): stratified sand, loamy sand, sandy clay loam, sandy clay
Clay content: 3 to 45 percent
Calcium carbonate equivalent: 1 to 4 percent
Reaction: pH 7.6 to 8.2
COMPETING SERIES:
Holmquist (SD): have salt concentrations throughout
GEOGRAPHIC SETTING:
Landform: oxbows and flood plains
Elevation: 1,800 to 1,900 meters
Slope: 0 to 2 percent
Parent Material: alluvium
Climate: long, cold winters; cool, moist springs; short, cool summers.
Mean annual precipitation: 225 to 350 mm with peak periods of precipitation occurring during the winter
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: Very poorly drained and 1.0 to 300.00 um/sec.
USE AND VEGETATION: Dampe soils are primarily used for pasture. The vegetation is mainly northern reedgrass, tufted hairgrass, Nebraska sedge, cattails and other sedges, rushes, and forbs.
DISTRIBUTION AND EXTENT: Dampe soils are of small extent in southwestern Wyoming. MLRA 13.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Lincoln County, Wyoming, 2017. The series name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Redoximorphic features: 17 to 155 cm (C1, C2, Cg1, 2Cg2, 3Cg3)
Particle-size control section - from 25 to 100 cm (part of C1, C2, Cg1, 2Cg2 horizons).
Dampe soils have a frigid temperature regime and an aquic moisture regime.
National Cooperative Soil Survey
U.S.A.