LOCATION NATALBANY LA
Established Series
Rev. JDS;DRM-WLC
02/2013
NATALBANY SERIES
The Natalbany series consists of poorly drained, very slowly permeable soils that formed in Holocene or Late Pleistocene Age clayey deposits. These soils are on flood plains in drainageways that are adjacent to low lying backswamp areas. Slopes range from 0 to 1 percent.
TAXONOMIC CLASS: Fine, smectitic, thermic Vertic Epiaqualfs
TYPICAL PEDON: Natalbany silty clay loam--on a 0.5 percent slopes in bottomland hardwood vegetation at an elevation of 7 feet. (Colors are for moist soil unless otherwise stated.)
A--0 to 5 inches; dark grayish brown (10YR 4/2) silty clay loam; weak fine granular structure; friable; few fine and medium roots; very strongly acid; clear smooth boundary. (3 to 7 inches thick)
Btg1--5 to 17 inches; dark gray (10YR 4/1) silty clay; moderate medium subangular blocky structure; firm; few fine and medium roots; thin patchy very dark gray (10YR 3/1) clay films on faces of peds; common medium prominent yellowish brown (10YR 5/6) masses of iron accumulation; very strongly acid; gradual wavy boundary. (10 to 26 inches thick)
Btg2--17 to 32 inches; dark gray (10YR 4/1) clay; moderate medium subangular blocky structure; firm; few fine and medium roots; many thick continuous very dark gray (10YR 3/1) clay films on faces of peds; many medium prominent strong brown (7.5YR 5/6) masses of iron accumulation; very strongly acid; gradual wavy boundary. (6 to 28 inches thick)
Btg3--32 to 42 inches; grayish brown (2.5Y 5/2) clay; moderate medium subangular blocky structure; firm; few medium roots; many thick continuous dark gray (10YR 4/1) clay films on faces of peds; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; extremely acid; gradual wavy boundary. (10 to 20 inches thick)
BCg--42 to 60 inches; grayish brown (2.5Y 5/2) silty clay; weak coarse subangular blocky structure; firm; few patchy dark gray (10YR 4/1) clay films on faces of peds; few medium roots; many medium prominent strong brown (7.5YR 5/6) masses of iron accumulation; very strongly acid; clear wavy boundary. (10 to 28 inches thick)
Cg--60 to 80 inches; greenish gray (5BG 5/1) silty clay; massive; firm; common fine and medium black and brown concretions; common medium distinct light olive brown (2.5Y 5/4) masses of iron accumulation; neutral.
TYPE LOCATION: Livingston Parish, Louisiana; 0.9 miles southeast of Frost, 3,900 feet south of Louisiana Highway 42, 200 feet east of Gum Swamp Road; sec. 32, T. 5 E., R. 7 S.
RANGE IN CHARACTERISTICS: The thickness of the solum ranges from 40 to 80 inches.
The A horizon has hue of 10YR or 7.5YR, value of 3 or 4, and chroma of 1 or 2. Texture is silty clay loam or silt loam. Reaction ranges from extremely acid to medium acid except where the surface has been limed.
The Eg horizon, where present has hue of 10YR, value of 5 or 6, and chroma of 1 or 2. It is silt loam or silty clay loam. Reaction ranges from extremely acid to moderately acid.
The Btg horizon has hue of 10YR, 2.5Y, or 5Y, value of 3 to 6, and chroma of 1 or 2. Texture is silty clay or clay. Reaction ranges from extremely acid to slightly acid. Iron accumulations are in shades of brown or olive and range from few to many. Clay films on surfaces of peds are very dark gray or dark gray.
The BCg and Cg horizons, have hue of 10YR, 2.5Y, 5Y, or 5BG, value of 4 to 6, and chroma of 1, or they are neutral with value of 4 to 6. Texture is clay or silty clay. Reaction ranges from very strongly acid to moderately alkaline.
COMPETING SERIES: This is the
Panola series in the same family, and the
Alligator,
Baldwin,
Forestdale, Mahew,
Midland,
Sessum,
Sharkey, and
Wilson series in closely related families. Alligator and Sharkey soils do not have an argillic horizon. Baldwin soils have a loamy 2Cg horizon and are in a hyperthermic soil temperature regime. Forestdale soils have a loamy BC and C horizon. Mahew soils have shale fragments in the lower horizons and are underlain by soft shale. Midland soils have lower COLE values and do not form cracks during normal years. Panola and Wilson soils are dry for long periods, and form cracks that remain open for more than 90 days in normal years. Sessum soils do not have dark ped coatings in the upper Bt horizon.
GEOGRAPHIC SETTING: Natalbany soils are on level to nearly level flood plains in drainageways that are adjacent to low lying backswamp areas. Slopes range from 0 to 1 percent. They formed in clayey deposits of Holocene Age or Late Pleistocene Age. Near the type location, the mean annual temperature is about 67 degrees F, and the mean annual precipitation is about 64 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Abita,
Barbary,
Colyell,
Encrow, and
Springfield soils. The somewhat poorly drained Abita and Colyell soils are on higher convex ridges and are less clayey throughout. The very poorly drained Barbary soils are in lower lying backswamps and have fluid mineral layers. The poorly drained Encrow and Springfield soils are on level or nearly level interfluves on higher landscape positions. Encrow soils have a glossic horizon. Springfield soils have an abrupt textural change.
DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is high and permeability is very slow. An apparent water table fluctuates between a depth of 1.0 feet and the soil surface during December through April in normal years.
USE AND VEGETATION: Most areas are in bottomland hardwood forest. A few small areas are used for pasture.
DISTRIBUTION AND EXTENT: Southern Mississippi Valley Alluvium (MLRA 131) and Southern Mississippi Valley Silty Uplands (MLRA 134) in Louisiana and possibly Mississippi. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: AUBURN, ALABAMA
SERIES ESTABLISHED: Livingston Parish, Louisiana; 1987.
REMARKS: Diagnostic horizons and features recognized in the type location pedon include:
Ochric Epipedon - 0 to 5 inches.
Argillic Horizon - 5 to 60 inches.
ADDITIONAL DATA: Laboratory data for the typifying pedon is from the Louisiana Agricultural Experiment Station, Soil Characterization Laboratory (sample number S85LA-063-003).
National Cooperative Soil Survey
U.S.A.