LOCATION BAYOUDAN LAEstablished Series
TAXONOMIC CLASS: Very-fine, smectitic, thermic Aquic Dystruderts
TYPICAL PEDON: Bayoudan clay on a 22 percent slope in planted clearcut woodland.
(Colors are for moist soil.)
A--0 to 2 inches; dark grayish brown (10YR 4/2) clay; weak medium granular structure; firm, plastic; few fine and medium roots; strongly acid; abrupt irregular boundary. (0 to 5 inches thick)
Bw--2 to 7 inches; yellowish red (5YR 5/6) clay; moderate medium subangular blocky structure; firm, plastic; few fine and medium roots; few fine pores; many prominent shiny faces on peds; common medium prominent grayish brown (10YR 5/2) iron depletions; many medium faint reddish brown (5YR 5/4) masses of iron accumulation; extremely acid; clear wavy boundary.
Bss--7 to 18 inches; yellowish brown (10YR 5/4) clay; weak medium subangular blocky structure; firm, plastic; few fine and medium roots; many prominent shiny faces on peds; few prominent intersecting slickensides; few fine prominent reddish brown (5YR 5/4) masses of iron accumulation; common medium distinct grayish brown (10YR 5/2) iron depletions; extremely acid; gradual wavy boundary. (Combined thickness of the Bw and Bss horizons is 10 to 24 inches.)
Bssy1--18 to 34 inches; pale olive (5Y 6/3) clay; weak medium blocky structure; firm, plastic; few fine and medium roots; few prominent intersecting slickensides; common medium and fine gypsum crystals; common coarse prominent yellowish brown (10YR 5/8) masses of iron accumulation; extremely acid; gradual wavy boundary.
Bssy2--34 to 41 inches; stratified light olive brown (2.5Y 5/4) and yellowish brown (10YR 5/4) clay; weak medium blocky structure; firm, plastic; few fine roots; many intersecting slickensides; common medium and fine gypsum crystals; common medium distinct yellowish brown (10YR 5/4) masses of iron accumulation; very strongly acid; abrupt wavy boundary.
Bssy3--41 to 63 inches; stratified light olive brown (2.5Y 5/4) and yellowish brown (10YR 5/4) clay; weak medium blocky structure; firm, plastic; many intersecting slickensides; common medium gypsum crystals; common medium distinct yellowish brown (10YR 5/4)masses of iron accumulation; slightly alkaline.
TYPE LOCATION: Catahoula Parish, Louisiana; 2.7 miles west on LA Hwy 124 from LA Hwy 559; west on gravel road 1.5 miles; northwest on logging road 350 feet; SE1/4NW1/4, sec. 29, T. 11 N., R. 5 E.
RANGE IN CHARACTERISTICS: Solum thickness is more than 60 inches. Intersecting slickensides range from few to many. Reaction is extremely acid or very strongly acid in more than half of the thickness of the upper 20 inches.
The A horizon, where present, has hue of 10YR, value of 2 to 5 and chroma of 1 to 4. It is clay, silty clay, or silty clay loam. Reaction ranges from very strongly acid to slightly acid.
The Bw horizon has hue of 2.5YR to 10YR, value of 4 or 5, and chroma of 4 to 8. Texture is clay. Iron accumulations in shades of brown or red, and iron depletions in shades of gray range from few to many. Reaction ranges from extremely acid to strongly acid.
The Bss horizon has hue of 2.5YR to 10YR, value of 4 or 5, and chroma of 4 to 8; or hue of 2.5Y or 5Y value of 4 to 6, and chroma of 2 to 4. Texture is is clay. Iron accumulations in shades of brown or red, and iron depletions in shades of gray range from few to many. Reaction ranges from extremely acid to strongly acid.
The Bssy horizon has hue of 10YR to 5Y, value of 5 or 6, and chroma of 2 to 4. Texture is clay. Iron accumulations in shades of brown or red, and iron depletions in shades of gray range from none to common. Reaction ranges from extremely acid to moderately alkaline. Gypsum crystals range from few to many.
COMPETING SERIES: This is the Vaiden series in the same family, and the Boswell, Burkeville, Colbert, Kipling, Lacerda, Lebeau, Oktibbeha, Raylake, Redco, Sessum, Susquehanna, Sweatman, Watsonia, Wilcox, and Woodtell series in similar families. Vaiden soils have an argillic horizon and formed over chalk. Burkeville and Redco soils are better drained and have matrix color that is chroma of 2 or less in the subsoil. Lacerda soils are are better drained, have more grayish color in the subsoil and typically are less acid. Lebeau soils are not as acid and have redder hue throughout. Boswell, Kipling, Raylake, Susquehanna, Watsonia, Wilcox, and Woodtell soils have a fine textured control section. Colbert soils are underlain by hard limestone. Oktibbeha, and Sweatman soils have an argillic horizon. Sessum soils have grayer colors.
GEOGRAPHIC SETTING: Bayoudan soils are on gently sloping to steep Coastal Plains. These soils developed in very fine clayey alluvial deposits of Tertiary age which have been correlated as the Jackson formation. Land slides are a common feature which mark the landscape of this soil. The climate is warm and humid. The mean annual precipitation is about 52 inches and the mean annual temperature is about 65 degrees near the type location.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Alligator, Providence, Maben, and Smithdale series. Alligator soils are gray throughout and are on adjacent stream flood plains. Maben, Providence, and Smithdale soils are on similar landscapes. Maben soils are fined textured and have an argillic horizon. Providence soils are fine-silty and have a fragipan. Smithdale soils have a fine-loamy control section.
DRAINAGE AND PERMEABILITY: Bayoudan soils are moderately well drained. Runoff is medium to very rapid and permeability is very slow.
USE AND VEGETATION: This soil is used almost exclusively for woodland, wooland grazing, and wildlife habitat. Vegetation is dominantly southern pine and mixed hardwoods.
DISTRIBUTION AND EXTENT: Southern Coastal Plains of central Louisiana and possibly Mississippi and Texas. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Catahoula Parish, Louisiana; 1983.
REMARKS: This soil was previously included with the Susquehanna series.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface to a depth of 7 inches (the A horizon).
Cambic horizon - the zone from a depth of 2 inches to a depth of 63 inches (the Bw, Bss and Bssy horizons).
Slickensides - in the zone from a depth of 7 inches to a depth of 63 inches (the Bss and Bssy horizons).