LOCATION CAPTIVA FL
Established Series
Rev. WGH:TEC; GRB
03/2019
CAPTIVA SERIES
The Captiva series consists of very deep, poorly drained, very rapidly permeable soils on broad, low flats near the Gulf Coast. They formed in thick marine deposits of sand and shell fragments. Near the type location, the mean annual temperature is about 73 degrees F., and the mean annual precipitation is about 55 inches. Slopes range from 0 to 1 percent.
TAXONOMIC CLASS: Siliceous, hyperthermic Mollic Psammaquents
TYPICAL PEDON: Captiva fine sand--on a smooth 0.5 percent slope in a brushy area (Colors are for moist soil unless otherwise stated).
A--0 to 6 inches; black (10YR 2/1) rubbed, fine sand; single grained; loose; many fine and few medium roots; about 15 percent, by volume, shell fragments; calcareous; slightly alkaline; clear smooth boundary. (6 to 9 inches thick)
C1--6 to 15 inches; pale brown (10YR 6/3) fine sand; single grained; loose; few fine roots; about 10 percent, by volume, multicolored shell fragments; common light gray (10YR 7/1) streaks; calcareous; moderately alkaline; gradual wavy boundary.
C2--15 to 26 inches; light gray (10YR 7/2) fine sand; single grained; loose; few fine roots; about 15 percent, by volume, multicolored shell fragments; many medium distinct pale brown (10YR 6/3) masses of redoximorphic accumulation; calcareous; moderately alkaline; abrupt smooth boundary.
C3--26 to 30 inches; light gray (10YR 7/1) fine sand; single grained; loose; about 30 percent, by volume, multicolored shell fragments; moderately alkaline; calcareous; clear wavy boundary.
C4--30 to 80 inches; light gray (5Y 7/1) fine sand; single grained; loose; about 2 percent, by volume, multicolored shell fragments; moderately alkaline; calcareous.
TYPE LOCATION: Lee County, Florida; approximately 30 feet south of unpaved road; NE1/4, SW1/4, Sec. 25, T. 46 S., R. 22 E.; lat. 26 degrees 25 minutes 53.61 seconds N. and long. 82 degrees 4 minutes 6.29 seconds W., NAD83.
RANGE IN CHARACTERISTICS: Reaction is slightly alkaline or moderately alkaline and calcareous throughout. Texture is to depths of 80 inches or more.
The A horizon has hue of 10YR, value of 2 or 3, and chroma of 1 or 2. Content of shell fragments ranges from about 10 to 15 percent, by volume. Texture is fine sand, sand, or coarse sand.
The C horizon has hue of 10YR to 5Y, value of 5 to 7, and chroma of 1 to 3. It is a mixture of fine sand, sand, or coarse sand and multicolored shells or shell fragments. Shell fragments greater than 2 mm in size comprise less than 35 percent, by volume. Redoximorphic features and streaks in shades of gray or brown range from few to common. Texture is fine sand, sand, or coarse sand.
COMPETING SERIES: These are the
Margate series in the same family.
GEOGRAPHIC SETTING: Captiva soils are on broad low flat areas near the Gulf Coast of Peninsular Florida. Slopes are less than 1 percent. The climate is humid subtropical. They formed in thick deposits of sand and shell fragments. Near the type location, the mean annual precipitation is about 55 inches and the mean annual temperature is about 73 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Canaveral and
Kesson series. Canaveral soils are on higher elevations and are better drained. Kesson soils have a high sulfur content and are subject to tidal flooding.
DRAINAGE AND PERMEABILITY: Poorly drained; very rapid permeability.
USE AND VEGETATION: Captiva soils are used mainly for wildlife habitat. The native vegetation consists of sand cordgrass, leatherleaf fern, waxmyrtle, and Brazilian pepper.
DISTRIBUTION AND EXTENT: Southwest part of Peninsular Florida
along the Gulf Coast and possibly the Atlantic Coast. The series
is of small known extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Auburn, Alabama.
SERIES ESTABLISHED: Lee County, Florida; 1982.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic great group - the zone from 0 to 6 inches (A horizon).
Internal drainage is impeded by a shallow water table. The water table is within depths of 10 inches for 1 to 2 months during the normal summer rainy season and other periods of high rainfall. It is within depths of 10 to 40 inches for 10 months during most years. In some years the soil is covered by standing water for several days.
These soils were formerly included in the Canaveral series.
National Cooperative Soil Survey
U.S.A.