LOCATION BIBB AL+AR FL GA KY LA MS NC OK SC TN TX VAEstablished Series
The Bibb series consists of very deep, poorly drained, moderately permeable soils that formed in stratified loamy and sandy alluvium. These soils are on flood plains of streams in the Coastal Plain. They are commonly flooded and water runs off the surface very slowly. Slopes range from 0 to 2 percent. Near the type location, the average annual air temperature is about 65 degrees F. and the average annual precipitation is about 54 inches.
TAXONOMIC CLASS: Coarse-loamy, siliceous, active, acid, thermic Typic Fluvaquents
TYPICAL PEDON: Bibb sandy loam--forested. (Colors are for moist soils.)
A--0 to 4 inches; brown (10YR 4/3) sandy loam; weak fine granular structure; friable; common fine roots and pores; strongly acid; abrupt wavy boundary. (2 to 6 inches thick)
Ag--4 to 12 inches; mottled dark gray (N 4/ ) and dark grayish brown (10YR 4/2) sandy loam; weak fine granular structure; friable; few fine roots and pores; common fine strong brown (7.5YR 5/6) stains around old roots; strongly acid; clear wavy boundary. (0 to 19 inches thick)
Cg1--12 to 37 inches; gray (5Y 5/1) sandy loam; massive; friable; few fine roots and pores; common medium strong brown (7.5YR 5/6) stains around old roots; common thin strata of silt loam to loamy sand; some strata have bits of partially decomposed organic materials; very strongly acid; clear wavy boundary. (10 to 40 inches thick)
Cg2--37 to 60 inches; gray (N 5/ ) silt loam; massive; slightly sticky; common strata of sandy loam and loamy sand; common thin strata with partially decomposed organic materials; strongly acid.
TYPE LOCATION: Autauga County, Alabama; 300 yards north of where Martin Boulevard crosses Pine Creek in Prattville, in the SE1/4, SW1/4, SW1/4 of Sec. 26, T. 13 N., R. 16 E.
RANGE IN CHARACTERISTICS: Reaction ranges from extremely acid to strongly acid throughout. Content of mica flakes ranges from none to common. Content of rounded gravel typically ranges from 0 to 10 percent throughout, but may range to 35 percent in thin strata below a depth of 40 inches. Buried soil horizons, present in many pedons, have the same range in color and texture as the Ag horizon.
The A or Ap horizon has hue of 7.5YR or 10YR, value of 2 to 5, and chroma of 1 to 3. It is sand, loamy sand, loamy fine sand, fine sandy loam, sandy loam, loam, or silt loam.
The Ag horizon, present in most pedons, has hue of 10YR or 2.5Y, value of 3 to 7, and chroma of 2 or less; or it is neutral with value of 3 to 7. Combined thickness of the A and Ag horizons with value of 3 or less is less than 6 inches. Mottles in shades of brown and yellow range from none to common. Texture is sand, loamy sand, loamy fine sand, fine sandy loam, sandy loam, loam, or silt loam.
The Cg horizon has hue of 10YR through 5BG, value of 3 to 7, and chroma of 2 or less; or it is neutral with value of 3 to 7. Mottles in shades of red, yellow, and brown range from few to many. The upper part of the Cg horizon is sandy loam, fine sandy loam, loam, or silt loam; or is stratified with these textures. Thin strata of finer or coarser textured material are in most pedons. Texture of the lower part of the Cg horizon includes sand, loamy sand, and loamy fine sand in addition to those of the upper part.
COMPETING SERIES: There are no known series in the same family. Competing series in closely similar families are the Keechi, Kinston, Muckalee, and Osier series. Keechi and Kinston soils are fine-loamy. Muckalee soils are nonacid. Osier soils are sandy throughout.
GEOGRAPHIC SETTING: Bibb soils are on flood plains of streams in the Coastal Plain. Slopes are generally less than 2 percent. The soil formed in loamy and sandy alluvium. They flood frequently unless protected, and are subject to scouring and uneven deposition of overwash. The climate is warm and humid. The average annual air temperature ranges from 59 to 72 degrees F., and the average annual precipitation ranges from 40 to 60 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: In addition to the competing Kinston and Osier soils on similar landforms; these are the Iuka, Mantachie, Myatt, and Ochlockonee soils. These soils are on slightly higher landforms. Iuka soils have subhorizons with chroma 3 or more. Mantachie soils are fine-loamy and have subhorizons with chroma 3 or more. Myatt soils have fine-loamy argillic horizons. Ochlockonee soils are well drained.
DRAINAGE AND PERMEABILITY: Poorly drained; very slow runoff; moderate permeability. The water table is within 8 inches of the surface from 6 to 11 months each year.
USE AND VEGETATION: Dominantly native woodland of sweetgum, loblolly pine, red maple, water oak, willow oak, green ash, baldcypress, swamp tupelo, and black willow. A few areas have been cleared, drained, and used for pasture.
DISTRIBUTION AND EXTENT: Coastal Plain of Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, New Jersey, Oklahoma, South Carolina, Tennessee, Texas, and Virginia. The series is of large extent.
MLRA OFFICE RESPONSIBLE: Auburn, Alabama
SERIES ESTABLISHED: Pike County, Mississippi; 1910.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: 0 - 12 inches (A, Ag)
Fluvaquentic features: low chroma colors in matrix, irregular decrease in organic carbon, and presence of thin strata of contrasting texture
SIR = AL0033, AL0141