LOCATION SNYDERSDITCH WY
Tentative Series
IRD. DEW/JCK
02/2017
SNYDERSDITCH SERIES
The Snydersditch series consist of very deep, moderately well drained soils that formed in alluvium. These soils are on stream terraces and alluvial fans. Slopes are 0 to 8 percent. Mean annual precipitation is about 309 mm, and mean annual air temperature is about 7 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquic Haplargids
TYPICAL PEDON: Snydersditch sandy clay loam, 2 percent slope in cropland at an elevation of 1,517 meters (colors are for dry soil unless otherwise noted).
Ap--0 to 25 cm; light brown (7.5YR 6/4) sandy clay loam, brown (7.5YR 5/4) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; common very fine roots throughout; slightly effervescent; moderately alkaline (pH 7.9); clear smooth boundary. (18 to 30 cm thick)
Btk1--25 to 74 cm; pink (7.5YR 7/4) sandy clay loam, light brown (7.5YR 6/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots throughout, common very fine and fine tubular pores; 20 percent distinct clay films on faces of peds; finely disseminated carbonates and 3 percent fine moist irregular calcium carbonate masses in the matrix; strongly effervescent; moderately alkaline (pH 8.0); clear smooth boundary.
Btk2--74 to 88 cm; brown (7.5YR 5/4) sandy clay loam, brown (7.5YR 4/4) moist; moderate medium subangular block structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots throughout, common very fine tubular pores; 15 percent distinct clay films of faces of peds; finely disseminated carbonates and 5 percent fine moist irregular calcium carbonate masses in the matrix; 5 percent 10YR 3/1 manganese masses, 5 percent 7.5YR 5/6 oxidized iron messes, 3 percent 10YR 6/2 iron depletions; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (combined thickness of the Btk horizons is 30 to 115 cm)
BCk--88 to 200 cm; light brown (7.5YR 6/4) sandy loam, brown (7.5YR 5/4) moist; single grain; loose, nonsticky and nonplastic; 2 percent fine moist irregular calcium carbonates masses in the matrix; 3 percent 10YR 3/1 manganese masses, 5 percent 7.5YR 5/6 oxidized iron masses, 5 percent 10YR 6/1 iron depletions; slightly effervescent; slightly alkaline (pH 7.8).
TYPE LOCATION: Park county Wyoming; 286 meters south and 227 meters east of the northwest corner of section 4, T. 50N., R. 98W.; Sheets flat USGS quadrangle; latitude 44 degrees 20 minutes 23.42 seconds N. and longitude 108 degrees 39 minutes 5.99 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 8 to 10 degrees C
Depth to seasonal high water table - 90 to 180 cm
Rock fragments - 0 to 15 percent gravel
Note: where cultivated, saturation is, in part, from intensive flood irrigation.
A horizon:
Hue: 7.5YR to 2.5Y
Value: 5 or 6 dry; 3, 4 or 5 moist
Chroma: 3 or 4
Texture: sandy loam, fine sandy loam, sandy clay loam or loam
Clay content: 18 to 28 percent
Rock fragments: 0 to 15 percent gravel
Electrical conductivity: 2 to 8 mmhos/cm
Reaction: 7.6 to 8.0
Btk horizon:
Hue: 7.5YR to 2.5Y
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 3, 4 or 6
Texture: sandy clay loam, loam, fine sandy loam or sandy loam
Clay content: 18 to 28 percent
Rock fragments: 0 to 15 percent gravel
Calcium carbonate equivalent: 5 to 15 percent
Electrical conductivity: 2 to 8 mmhos/cm
Reaction: 7.8 to 8.4
BCk horizon:
Hue: 7.5YR to 2.5Y
Value: 6 or 7 dry; 4, 5 or 6 moist
Chroma: 3, 4 or 6
Texture: sandy loam, fine sandy loam, loamy sand or sand
Clay content: 5 to 18 percent
Rock fragments: 0 to 15 percent gravel
Calcium carbonate equivalent: 2 to 5 percent
Electrical conductivity: 2 to 8 mmhos/cm
Reaction: 7.8 to 8.2
COMPETING SERIES:
Jimmerfield (WY) - have more than 18 percent clay in the lower part of the subsoil; have hues redder than 7.5YR
Manzanar (CA) - have horizons of strong gleying; have a lithologic discontinuity
Roachgulch (WY) - do not have horizons of secondary calcium carbonate accumulation
Sheetsflat (WY) - do not have horizons of secondary calcium carbonate accumulation in the surface mantle
GEOGRAPHIC SETTING:
Landform - stream terraces and alluvial fans
Elevation - 1,400 to 1,700 meters
Slope - 0 to 8 percent slopes
Parent material - alluvium
Mean annual precipitation - 254 to 356 mm
Mean annual air temperature - 6 to 8 degrees C
Frost-free period - 110 to 150 days
GEOGRAPHICALLY ASSOCIATED SOILS: None
DRAINAGE AND PERMEABILITY: Moderately well drained; moderate to moderately rapid permeability.
USE AND VEGETATION: Snydersditch soils are used mainly for irrigated alfalfa and grass hay.
DISTRIBUTION AND EXTENT: Snydersditch soils are of small extent in northwest Wyoming. MLRA 32.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Park County, Wyoming; 2016. The name is taken from a local irrigation canal.
REMARKS:
Ochric epipedon - from 0 to 25 cm (Ap horizon)
Argillic horizon - from 25 to 88 cm (Btk1 and Btk2 horizons)
Redoximorphic concentrations - from 74 to 200 cm (Btk2 and BCk horizons)
Redoximorphic depletions - from 74 to 200 cm (Btk2 and BCk horizons)
Particle-size control section - from 25 to 75 cm (Btk1 and part of Btk2 horizons)
Snydersditch soils have a mesic temperature regime and an aridic moisture regime bordering on ustic.
National Cooperative Soil Survey
U.S.A.