LOCATION WEYANOKE LA+MS
Established Series
DRM:JPE
02/2013
WEYANOKE SERIES
The Weyanoke series consists of well drained soils that formed in silty alluvium of Holocene age. These soils are on slightly convex ridges on local stream terraces along floodplains in the Southern Mississippi Valley Silty Uplands. Slopes range from 0 to 3 percent.
TAXONOMIC CLASS: Coarse-silty, mixed, active, thermic Dystric Eutrudepts
TYPICAL PEDON: Weyanoke silt on a 1.5 percent slope in pasture at an elevation of 50 feet. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 3 inches; brown (10YR 5/3) silt; weak fine granular structure; friable; many fine roots; neutral; clear smooth boundary (2 to 8 inches thick).
Bw1--3 to 12 inches; yellowish brown (10YR 5/4) silt; weak moderate subangular blocky structure; friable; many fine roots; few worm casts; few fine pores; neutral; clear wavy boundary.
Bw2--12 to 27 inches; dark yellowish brown (10YR 4/4) silt; weak medium subangular blocky structure; friable; common fine roots; few worm casts; few fine pores; neutral; clear wavy boundary. (Combined thickness of the Bw horizon ranges from 16 to 40 inches.)
C--27 to 60 inches; yellowish brown (10YR 5/4) silt loam; common medium distinct pale brown (10YR 6/3) mottles; massive; friable; common bedding planes; neutral.
TYPE LOCATION: West Feliciana Parish, Louisiana; about 1.7 miles west of St. Francisville; 600 feet east of Bayou Sara, 100 feet south of Parish road; Spanish Land Grant, sec. 70, T.3S., R.3W.
RANGE IN CHARACTERISTICS: The thickness of the solum ranges from 18 to 48 inches. Reaction ranges from medium acid to mildly alkaline throughout. Content of total sand in the particle-size control section ranges from 5 to 20 percent. Less than 15 percent of the sand in the particle-size control section is fine sand or coarser.
The A or Ap horizon has hue of 10YR, value of 3 to 5, and chroma of 1 to 4. Where value is 3, the A or Ap horizon is less than 6 inches thick. Texture is silt, silt loam, or very fine sandy loam.
The Bw horizon has hue of 10YR, value of 4 or 5, and chroma of 3 to 8. Mottles are in shades of brown. Some pedons have mottles of chroma of 2 or less below 24 inches from the surface. Texture is silt, silt loam, or very fine sandy loam.
The BC horizon, if present, has colors similar to the Bw. Mottles are in shades of gray or brown. Texture is silt loam, loam or fine sandy loam.
The C horizon has colors similar to the Bw. Mottles are in shades of gray or brown. Bedding planes range from few to many. Texture is silt loam, loam, fine sandy loam, or very fine sandy loam.
COMPETING SERIES: There are no other series in the same family. Similar soils are the
Ariel,
Barclay,
Beulah,
Cascilla,
Collins,
Dexter, Leverette,
Memphis,
Morganfield,
Natchez,
Ouachita,
Tippo, and
Vicksburg soils. Ariel soils have lower base saturation in the 10 to 40 inch control section. Barclay soils have mottles of chroma of 2 or less within 24 inches of the soil surface. Beulah soils have more than 15 percent fine and coarser sand in the family control section. Dexter, Memphis and Ouachita soils are fine-silty. Dexter and Memphis soils have an argillic horizon. Collins, Morganfield and Vicksburg soils lack a cambic horizon. Leverette and Tippo soils have a fragipan. Natchez soils have slopes greater than 12 percent and formed in loess.
GEOGRAPHIC SETTING: Weyanoke soils occur on level to nearly level local stream terraces along floodplains in the Southern Mississippi Valley Silty Uplands. These soils formed in loamy alluvial sediments. Slopes range from 0 to 3 percent. The mean annual temperature is 65.7 degrees F and the mean annual precipitation is 61.6 inches near the type location.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Bigbee,
Calhoun,
Loring,
Memphis,
Morganfield,
Natchez, and
Olivier soils. Calhoun, Loring, Memphis, Natchez and Olivier soils are on terraces at higher elevations. Olivier and Loring soils have a fragipan. The well drained Morganfield and the excessively drained Bigbee soils are on floodplains of drainageways.
DRAINAGE AND PERMEABILITY: Weyanoke soils are well drained. Runoff is slow. Permeability is moderate.
USE AND VEGETATION: Most of the Weyanoke soils are in pasture. A few small areas are in crops, woodland and homesites.
DISTRIBUTION AND EXTENT: Louisiana and Mississippi. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: AUBURN, ALABAMA
SERIES ESTABLISHED: West Feliciana Parish, Louisiana; 1992. The name Weyanoke is from a nearby small community.
REMARKS: Diagnostic horizons and other features recognized are:
Ochric epipedon .........0 to 3 inches (Ap).
Cambic horizon ...3 to 27 inches (Bw1, Bw2).
ADDITIONAL DATA: Laboratory data on typifying pedon were obtained from the soils laboratory of the Louisiana Agricultural Experiment Station, sample S91LA125-14 and 16.
National Cooperative Soil Survey
U.S.A.