LOCATION ISLAMORADA FL
Established Series
Rev. GWH/CAP/RBT
03/2021
ISLAMORADA SERIES
MLRA(s): 156A
Soil Survey Regional Office (SSRO) Responsible: Auburn, Alabama
Depth Class: Moderately deep
Drainage Class: Very poorly drained
Saturated Hydraulic Conductivity: High to very high in the organic material and negligible in the rock material
Index Surface Runoff: High to very high
Parent Material: Organic materials over oolitic limestone bedrock
Slope: 0 to 1 percent
Elevation: -1.0 to 3 feet above mean sea level.
Mean Annual Air Temperature: 26 degrees C. (78 degrees F.)
Mean Annual Precipitation: 1143 millimeters (45 inches)
TAXONOMIC CLASS: Euic, isohyperthermic Typic Sulfisaprists
TYPICAL PEDON: Islamorada muck in a tidal swamp dominated by red mangroves. (Colors are for moist soil unless otherwise stated.)
Oase1--0 to 13 centimeters (0 to 5 inches); black (5YR 2.5/1) muck, dark gray (5YR 4/1), dry; 20 percent unrubbed fiber content, 5 percent rubbed fiber; moderate sulfurous odor; 40 percent fine and medium live roots; neutral (pH 6.8); clear smooth boundary.
Oase2--13 to 89 centimeters (5 to 35 inches); very dark gray (5YR 3/1) muck; 35 percent unrubbed fiber content, 10 percent rubbed fiber; moderate sulfurous odor; 30 percent by volume of fine and medium live roots; neutral (pH 6.6); abrupt smooth boundary. [Combined thickness of the Oa horizon is 50 to 100 centimeters (20 to 39 inches thick)]
2R--89 centimeters (35 inches); weakly to strongly cemented oolitic limestone bedrock; solution holes up to 102 centimeters (40 inches) or more deep can be filled with sandy and/or loamy material.
TYPE LOCATION: Monroe County, Florida; Lower Matecumbe Key; about 1.0 mile southwest of Ligum Vitae Channel Bridge to an intersection with US Hwy. 1 and a gravel entrance; about 500 feet northwest of US Hwy. 1 and gravel intersection at about 145 degrees; about 4,710 feet at about 47 degrees northeast of the southwest corner of Sec. 15, T. 64 S., R. 36 E.; latitude 24 degrees 52 minutes 27.65 seconds N longitude, 80 degrees 42 minutes 12.54 seconds W; WSG84; USGS Upper Matecumbe Key, FL quadrangle.
RANGE IN CHARACTERISTICS:
Solum thickness: 50 to 100 centimeters (20 to 39 inches)
Depth to seasonally high water table: 0 to 15 centimeters (0 to 6 inches)
Soil Reaction: Slightly acid to slightly alkaline throughout
Sulfurous odor: Slight to strong throughout
Depth of the organic material: 50 to 100 centimeters (20 to 39 inches)
Depth to limestone bedrock: 50 to 100 centimeters (20 to 39 inches)
Fiber content: Unrubbed 5 to 50 percent; rubbed less than 17 percent
Particle-size control section, mineral (weighted averages):
Mineral content: 0 to 12 percent
Range of Individual Horizons:
Oase horizon:
Color: hue of 5YR to 10YR or Neutral, value of 2 or 3, and chroma of 3 or less
Texture: muck
EC (mmhos/cm): 16 to 32 or more
Exchangeable Sodium: 30 to 60 percent or more
Sodium Absorption Ratio: 30 to 60 percent or more
2R horizon: weakly to strongly cemented oolitic limestone bedrock; solution holes up to 102 centimeters (40 inches) or more deep can be filled with sandy and/or loamy material.
COMPETING SERIES: This is the
Keylargo series.
Keylargo soils have bedrock at depths of 150 centimeters (59 inches) or more and occur on similar landforms.
GEOGRAPHIC SETTING:
Landscape: Lower Coastal Plain
Landform(s): marine marshes, swamps, or low broad tidal flats on the Key West Islands and/or along the southern coast of the Florida Peninsula
Parent Material: Organic materials over oolitic limestone bedrock
Mean annual temperature: 25 to 27 degrees C (77 to 81 degrees F)
Mean annual precipitation: 1067 to 1397 millimeters (42 to 55 inches)
Frost-free period: 365 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Cudjoe soils - have a marly silt loam particle size control section and have bedrock at depths of 50 centimeters (20 inches) or less
Keywest soils - have stratification of marl and muck materials over oolitic limestone, have bedrock at depths of more than 100 centimeters (39 inches), and occur in similar landform positions.
Lignumvitae soils have a marly silt loam particle-size control section and do not have organic soil materials throughout
Matecumbe soils have bedrock at depths less than 25 centimeters (10 inches) and occur on slightly higher similar landform positions.
Saddlebunch soils have a marly silt loam particle-size control section, have bedrock at depths less than 50 centimeters (20 inches) and occur on slightly higher landform positions.
Tavernier soils have bedrock at depths less than 50 centimeters (20 inches) and occur on similar landform positions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Very poorly drained
Saturated hydraulic conductivity (KSAT): High to very high
Runoff: High to very high
Depth to seasonal high-water table: 0 to 15 centimeters (0 to 6 inches)
Flooding frequency and duration: very frequent and very brief from tides, also subject to flooding by storm surges and hurricanes
USE AND VEGETATION:
Major uses: wildlife habitat and water quality.
Dominant vegetation: black and red mangroves.
DISTRIBUTION AND EXTENT: MLRA 156A Florida Everglades and Associated Areas.
Extent: limited
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Auburn, Alabama
SERIES ESTABLISHED: Monroe County, Florida, 1989.
REMARKS:
These soils were formerly classified as Lithic Haplosaprists and are revised here to the twelfth edition of the keys (2014).
Diagnostic horizons and features recognized in this Pedon:
1. Histic epipedon - 0 to 89 centimeters (0 to 35 inches) (Oase1, Oase2 horizons)
2. Peraquic feature - the zone from 0 to 203 centimeters (0 to 80 inches)
3. Lithic contact - 89 centimeters (35 inches) (2R horizon)
4. Aquic conditions - Endosaturation ranges from 0 to 203 centimeters (0 to 80 inches)
5. Sulfidic feature - the zone from 0 to 89 centimeters (0 to 35 inches) contains sulfidic materials.
ADDITIONAL DATA:
Laboratory data is available on the National Soil Survey website at: http://ncsslabdatamart.sc.egov.usda.gov/querypage.aspx
OSD User Site ID: S1988FL087007
OSD User Pedon ID: S1988FL087007
National Cooperative Soil Survey
U.S.A.