Established Series


The Corolla series consists of moderately well and somewhat poorly drained soils formed in sandy sediments along the Atlantic Coast. Slope ranges from 0 to 6 percent.

TAXONOMIC CLASS: Thermic, uncoated Aquic Quartzipsamments

TYPICAL PEDON: Corolla sand.
(Colors are for moist soil unless otherwise stated.)

A--0 to 3 inches; dark grayish brown (10YR 5/2) sand; single grained; loose; few to many fine roots; neutral; clear wavy boundary. (2 to 8 inches thick)

C1--3 to 15 inches; very pale brown (10YR 7/3) sand; few medium distinct yellowish red (5YR 4/6) mottles; single grained; loose; uncoated; neutral; gradual wavy boundary. (6 to 15 inches thick)

C2--15 to 26 inches; light brownish gray (10YR 6/2) sand; few fine distinct yellowish red (5YR 4/6) mottles and fine streaks; single grained; loose; uncoated; common dark opaque grains; neutral; clear smooth boundary. (6 to 20 inches thick)

Ab--26 to 32 inches; dark grayish brown (10YR 4/2) sand; many medium faint grayish brown (10YR 5/2) mottles; single grained; loose; coated; few fine roots; slight sulfur odor; neutral; gradual wavy boundary. (0 to 10 inches thick)

Cg--32 to 60 inches; gray (5Y 6/1) sand; single grained; loose uncoated; few fine roots; slight sulfur odor; neutral.

TYPE LOCATION: Currituck County, North Carolina; approximately 2.5 miles south of the Virginia state line, and 0.4 mile west of the Atlantic Ocean.

RANGE IN CHARACTERISTICS: Thickness of the A and C horizon is more than 72 inches of fine to coarse sand. The soil is medium acid through moderately alkaline. Small calcareous shell fragments are present in some pedons. The soil contains a few to many grains of black, red, pink, dark brown, and white minerals.

The A horizon has hue of 10YR to 2.5Y, value of 3 to 8, and chroma of 0 to 3.

The upper C horizon has hue of 10YR to 2.5Y, value of 4 to 8, and chroma of 3 to 4. High chroma mottles are few to common in most pedons. Redox depletions occur as mottles or matrix colors within depths of 15 to 40 inches of the surface.

The Ab horizon, when present, occurs at depths of 24 to 72 inches below the surface and is similar in color to the A horizon. It contains few to common pieces of undecomposed plant materials.

The lower C horizon has hue of 10YR to 5Y, value of 4 to 8, and chroma of 0 to 2.

COMPETING SERIES: The Ousley series is the only other soil in the same family. Ousley soils are very strongly to strongly acid, are not affected by salt spray, and support tree growth.

GEOGRAPHIC SETTING: Corolla soils are on nearly level flats and gentle slopes between dunes and next to depressions and sloughs along the coast at elevations generally below about 15 feet. Slopes range from 0 to 6 percent. The soil formed in sandy sediments reworked by waves and wind. Average annual precipitation is about 48 inches and mean annual temperature about 62 degrees F., near the type location. Some of these soils may be flooded during hurricanes.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Carteret, Currituck, Duckston, and Newhan series. Carteret soils are on nearly level tidal marshes that are flooded by daily tides. Currituck is an organic soil with 16 to 51 inches of organic material over sand. They are on nearly level marshes that flood with fresh water. The poorly drained Duckston soils are commonly located in depressions and lower lying parts of the landscape. The excessively drained Newhan soils are common on the more sloping parts of the landscape.

DRAINAGE AND PERMEABILITY: Moderately well and somewhat poorly drained; slow runoff; very rapid permeability. The water table is about 18 to 36 inches below the surface 2 to 6 months annually.

USE AND VEGETATION: The natural plant community consists of live oak, wax myrtle, bitter panicum, wooly beachheather, coastal lovegrass, evening primrose, groundcherry, and bushy blustem.

DISTRIBUTION AND EXTENT: Along the Atlantic coast of Florida, Georgia, North Carolina, South Carolina, and Virginia. The series is moderate in extent.


SERIES ESTABLISHED: Currituck County, North Carolina; 1980.

REMARKS: The vegetation norm for the Duckston series is a coastal shrub plant community. Locally, a maritime forest exists on a minor acreage of the soil.



SOI-5  Soil Name   Slope  Airtemp FrFr/Seas Precip  Elevation
NC0005 COROLLA     0-  6   66- 70  230-310  50- 60     3-  15

SOI-5 FloodL FloodH Watertable Kind Months Bedrock Hardness NC0005 RARE 1.5-3.0 APPARENT NOV-MAY 60-60

SOI-5 Depth Texture 3-Inch No-10 Clay% -CEC- NC0005 0-72 S FS 0- 0 75-100 0- 3 1- 5

SOI-5 Depth -pH- O.M. Salin Permeab Shnk-Swll NC0005 0-72 5.6- 7.8 0.-.5 4-16 20- 20 LOW

National Cooperative Soil Survey