LOCATION OLDTOWN                 FL

Established Series
Rev. GRB
10/2018

OLDTOWN SERIES

The Oldtown series consists of very deep, very poorly drained soils in depressions and on flood plains in coastal lowlands of the Gulf Coast Flatwoods. They formed in sandy marine and alluvial sediments overlain by muck. Near the type location, the mean annual temperature is about 68 degrees F., and the mean annual precipitation is about 55 inches. Slopes range from 0 to 2 percent.

TAXONOMIC CLASS: Sandy, siliceous, thermic Histic Humaquepts

TYPICAL PEDON: Oldtown muck--in a wooded depression. (Colors are for moist soil.)

Oa--0 to 12 inches; black (10YR 2/1) muck; about 65 percent fiber; 10 percent rubbed; moderate medium granular structure, very friable; many fine, medium and coarse roots; moderately acid; abrupt smooth boundary. (8 to 15 inches thick)

A--12 to 18 inches; black (10YR 2/1) sand; moderate medium granular structure; very friable; many medium and coarse roots; common coarse pockets of gray (10YR 6/1) in lower part; moderately acid; clear wavy boundary. (4 to 9 inches thick)

E--18 to 27 inches; light brownish gray (10YR 6/2) sand; single grained; loose; few medium and coarse roots; common medium distinct very dark gray (10YR 3/1) organic stains; slightly acid; gradual wavy boundary. (2 to 36 inches thick)

Bw1--27 to 45 inches; light yellowish brown (10YR 6/4) sand; single grained; loose; few coarse roots; slightly acid; gradual wavy boundary.

Bw2--45 to 70 inches; yellowish brown (10YR 5/4) sand; single grained; loose; neutral; gradual wavy boundary. (Combined thickness of the Bw horizon is 30 to 61 inches.)

C--70 to 80 inches; light gray (10YR 7/2) sand; single grained; loose; slightly alkaline.

TYPE LOCATION: Dixie County, Florida. Approximately 2,000 feet west and 300 feet south of the northeast corner of Sec. 4, T. 21 S., R. 13 E.

RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to more than 80 inches. Soil reaction ranges from very strongly acid to moderately alkaline in the Oa and A horizons and from strongly acid to moderately alkaline in the other horizons.

The Oa horizon has hue of 5YR to 10YR, value of 2 or 3, and chroma of 4 or less. Percent fiber ranges from 5 to 15 percent rubbed and 20 to 75 percent unrubbed.

The A horizon has hue of 10YR to 5YR, value of 2 or 3, and chroma of 1 or 2. Texture is sand or fine sand.

The E horizon has hue of 10YR, value of 4 to 7, and chroma of 1 or 2. Redoximorphic features in shades of gray, brown, or yellow range from none to common. Texture is sand or fine sand.

The Bw horizon has hue of 10YR or 2.5Y, value of 4 to 7, and chroma of 3 to 8. Texture is sand or fine sand.

The C horizon has hue of 10YR, value of 5 to 7, and chroma of 1 or 2. Texture is sand, fine sand, or loamy fine sand.

COMPETING SERIES: There are no known series in the same family.

GEOGRAPHIC SETTING: Oldtown soils are in depressions and on flood plains of the Gulf Coast Lowlands. They formed in sandy marine and alluvial sediments overlain by thin accumulations of organic material. Slopes range from 0 to 2 percent. The average annual temperature ranges from 66 to 70 degrees F., and the average annual precipitation ranges from 50 to 60 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chaires, Clara, Leon, Meadowbrook, Ortega, and Ridgewood soils. All of the associated soils lack a histic epipedon. Chaires and Leon soils have a spodic horizon, and additionally, Chaires and Meadowbrook soils have an argillic horizon at a depth of more than 40 inches. Ortega and Ridgewood soils are on higher positions on the landscape and are better drained.

DRAINAGE AND PERMEABILITY: Very poorly drained; rapid permeability.

USE AND VEGETATION: Most areas of this soil are in natural woodland. The vegetation consists primarily of cypress, red maple, sweetgum, water oak, blackgum, bay, and cabbage palm. Understory vegetation includes maidencane, sawgrass, waxmyrtle, buttonbush, sedges, and other water tolerant grasses.

DISTRIBUTION AND EXTENT: Oldtown soils are on lowlands near the Gulf Coast area of Northern Florida. The series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Auburn, Alabama.

SERIES ESTABLISHED: Dixie County, Florida, 1998.

REMARKS: Diagnostic horizons and features recognized in this pedon include:

Histic epipedon - zone from the surface of the soil to a depth of 12 inches (Oa).

Albic horizon - zone from 12 to 27 inches (E).

These soils are ponded for 6 to 9 months in most years and are also frequently flooded for long periods on flood plains.

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National Cooperative Soil Survey
U.S.A.