Established Series


The Lanton series consists of very deep, poorly and somewhat poorly drained soils that are dark in the surface layer and to a depth of 24 inches or more. These soils formed in alluvium on flood plains and in depressions. They have moderately slow permeability in the solum and slow permeability in the clayey substratum. Slopes range from 0 to 3 percent.

TAXONOMIC CLASS: Fine-silty, mixed, superactive, thermic Cumulic Epiaquolls

TYPICAL PEDON: Lanton silt loam, cultivated. (Colors are for moist soil)

Ap--0 to 7 inches, very dark grayish brown (10YR 3/2) silt loam; moderate fine granular structure; friable; many roots; common fine pores; slightly acid; clear smooth boundary)

A1--7 to 23 inches, black (10YR 2/1) silty clay loam; moderate medium granular structure; friable; common fine roots; common fine pores; few black concretions; neutral; gradual smooth boundary.

A2--23 to 37 inches, black (10YR 2/1) silty clay loam; common medium distinct dark gray (10YR 4/1) and common prominent yellowish brown (10YR 5/4) mottles ; moderate medium granular structure; firm, few fine roots; few fine pores; few fine fragments of chert ; common fine black concretions; neutral; clear wavy boundary. (Combined thickness of the A horizon ranges from 24 to 45 inches)

Cg--37 to 62 inches, dark gray (10YR 4/1) clay, many medium prominent dark yellowish brown (10YR 4/4) and yellowish brown (10YR 5/4) mottles ; massive; firm; few fine fragments of chert; common black concretions; neutral.

TYPE LOCATION: Williamson County, Tennessee; one mile west of Thompson Station on R. R. Huff farm.

RANGE IN CHARACTERISTICS: Solum thickness ranges from 24 to 45 inches and depth to bedrock is more than 60 inches. This soil is slightly acid or neutral throughout. The mollic epipedon is more than 24 inches in thickness.

The A horizon has hue of 10YR or 2.5YR, value of 0 to 3 and chroma of 0 to 2, except the Ap horizon also has chroma of 3 in some pedons. The lower part has mottles in shades of gray or brown in most pedons. The A horizon is silt loam or silty clay loam with the clay content commonly higher in the lower part.

The Cg horizon has hue of 10YR or 2.5YR, value of 4 or 5, and chroma of 0 to 2. Mottles are in shades of brown, yellow, and gray. The texture is clay, silty clay, or silty clay loam. Some pedons have a Bg horizon with colors and textures like the Cg horizon.

COMPETING SERIES: These are the Hopco and Wynona series in the same family and the Dekoven, Dunning, Egam, Godwin, Lynnville, and Roellen series in associated families. Hopco soils have less than 35 percent clay throughout the profile. Wynona soils are slightly acid to strongly acid. Dekoven, Dunning, Lynnville and Roellen soils have mollic epipedons less than 24 inches in thickness. Dekoven, Dunning, Godwin and Roellen soils, are all in clayey families. Egam and Lynnville soils are moderately well drained.

GEOGRAPHIC SETTING: Lanton soils are on nearly level flood plains, and in depressions. Slopes range from 0 to 3 percent. The soil is formed in alluvium. Near the type location, mean annual temperature is 59.3 degrees F., and mean annual precipitation is 47.3 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Arrington, Staser, and Woolper series, in addition to the competing Egam, Godwin, Lynnville, and Roellen series. Arrington and Staser soils are well drained. Woolper soils have argillic horizons.

DRAINAGE AND PERMEABILITY: Poorly drained and somewhat poorly drained; slow runoff; moderately slow permeability except the lower, clayey part is slow.

USE AND VEGETATION: Nearly all of the acreage is cleared and used for growing corn, soybeans, hay, and pasture. The original vegetation was hardwood forest.

DISTRIBUTION AND EXTENT: The Nashville Basin and Highland Rim of Tennessee, the Bluegrass region of Kentucky, and in Missouri and Kansas. The series is of small extent.


SERIES ESTABLISHED: Williamson County, Tennessee; 1961.

REMARKS: Diagnostic horizons in the pedon are:
Molic epipedon - o to 37 inches (A horizon)

National Cooperative Soil Survey