LOCATION ANGUILLA CT RI
Tentative series
Rev. DAS/SJM
4/07
ANGUILLA
SERIES
The
TAXONOMIC CLASS: Sandy, mixed, mesic Haplic Sulfaquents.
TYPICAL PEDON:
Ag—0 to 10 cm; black (N 2.5/) mucky sand; single grain; very fluid; 1 percent herbaceous fibers, 0 percent rubbed; sulphurous odor; strongly saline (30 ppt); neutral (pH 7.0); ultra acid (pH 3.4) after 8 weeks; clear boundary.
ACg—10 to 40 cm; very dark greenish gray (10Y 3/1) mucky sand; single grain; very fluid; 1 percent herbaceous fibers, 0 percent rubbed; sulphurous odor; strongly saline; neutral (pH 7.1); ultra acid (pH 3.2) after 8 weeks; abrupt boundary. (Combined thickness of A and AC horizons is 30 to 50 cm)
2Bwb—40 to 100 cm; olive brown (2.5Y 4/4) loamy sand; few fine prominent strong brown (7.5YR 4/6) masses of iron accumulation; single grain; nonfluid; 20 percent herbaceous fibers, 5 percent rubbed; 5 percent gravels; strongly saline; neutral (pH 7.0); very strongly acid (pH 4.9) after 8 weeks; abrupt boundary. (0 to 100 cm thick)
3Cgb—100 to 150 cm; very dark grayish brown (2.5Y 3/2) very gravelly coarse sand; single grain; nonfluid; 50 percent gravels; strongly saline; neutral (pH 7.0); strongly acid (pH 5.5) after 8 weeks.
TYPE LOCATION: New London County, Connecticut; located about 550 feet south of the intersection of Island Road and the Providence and Worcester Rail Road and 685 feet north from the intersection of where Island Road encounters Goat Island in a cove, USGS Mystic topographic quadrangle; lat. 41 degrees 20 minutes 45.4 seconds N. and long. 71 degrees 53 minutes 27.1 seconds W., NAD 83.
RANGE IN CHARACTERISTICS: The soils are permanently submerged. All horizons have a pH of neutral and a pH of ultra acid to strongly acid after 8 weeks incubation. One or more horizons within 50 cm have a pH of 4.0 or less after 8 weeks incubation. Electrical conductivity is >16 mmhos/cm and salinity is >18 ppt throughout the profile.
The Ag and ACg horizons, when present, have hues of 5Y, 10Y, or N, value of 2.5 or 3, and chroma of 0 through 3. Texture is silt loam, sandy loam, mucky sand, sand, or coarse sand. Consistence is very fluid. It has 5 to 15 percent organic matter. Herbaceous fibers are 0 to 5 percent unrubbed and 0 percent rubbed. Sulphurous odor is present.
The C and 2C horizons, when present, have hues of 5Y or 2.5Y, value of 3, and chroma of 3. Texture is sandy loam, loamy sand, sand, or coarse sand in the fine earth fraction. Consistence is nonfluid. Gravel content is 0 to 20 percent. Redoximorphic features may be present.
The 2Bwb horizon, when present, has hue of 5Y or 2.5Y, value of 4, and chroma of 4. Texture is sandy loam, loamy sand, sand, or coarse sand. Consistence is nonfluid. Gravel content is 0 to 10 percent. Redoximorphic features are present.
The 2Cgb and 3Cgb horizons, when present, have hues of 5Y or 2.5Y, value of 3, and chroma of 2 or 3. Texture is sandy loam, loamy sand, sand, or coarse sand in the fine earth fraction. Consistence is nonfluid. Gravel content is 0 to 55 percent.
COMPETING SERIES: This is the Saltpond (T) series. Saltpond soils are
found in MLRA 153D on coastal plains and barrier islands.
GEOGRAPHIC SETTING: The
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Napatree (T), Quanaduck, and (T)
Rhodesfolly (T) soils. Napatree soils are coarse-loamy soils with a
capping of sandy marine deposits formed on submerged headlands. The Quanaduck
soils are coarse-loamy over sandy or sandy-skeletal soils formed on submerged
inland bay coves. The Rhodesfolly soils are formed in sandy marine deposits
with multiple buried horizons on bay bottoms, washover fans and shore faces.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Subaqueous soil, peraquic soil moisture regime, and high saturated hydraulic conductivity. Soil is permanently submerged with salt or brackish water.
USE AND VEGETATION: This soil supports submerged aquatic vegetation and wildlife habitats. The area is used by recreational fishermen for the harvest of crabs. In addition fishing is commonplace and the species found in the area are smelt, small cod, flounder, scup, menhaden, and white perch. Some areas are vegetated with native algae and eelgrass (Zostera marina). Vegetative cover ranges from 0 to 35 percent.
DISTRIBUTION AND EXTENT: Permanently submerged inland bay coves in MLRA 144A. The soils of this series are not extensive; approximately 55 hectares are mapped in Little Narragansett Bay.
MLRA OFFICE RESPONSIBLE:
SERIES PROPOSED:
REMARKS: The
Keys to Soil Taxonomy, Tenth Edition, 2006 states that the horizontal
boundaries of soil are areas where the soil grades into deep water (typically
less than 2.5 m). This subaqueous series is being proposed in areas previously
mapped as water in the Connecticut Soil Survey.
Using the proposed taxonomy for subaqueous soils, the series classifies as a sandy, mixed, mesic, Haplic Sulfiwassents.
Diagnostic horizons and features in this pedon include:
1. Peraquic feature - Positive soil water potential (permanently submerged) at the soil surface. (under 113 cm of salt water)
2. Particle-size control section – The zone from 25 to 100 cm (Part of the ACg, 2Bwb, and part of the 3Cgb horizon).
3. Ochric epipedon – the zone from 0 to 10 cm (the Ag horizon).
4. Sulfidic materials – within 50 cm of the mineral soil surface (the Ag and ACg horizons).
5. Development of color - the zone from 40 to 100 cm demonstrates development of color with no illuvial accumulation of material (2Bwb horizon). It is not a cambic horizon because it lacks texture finer than loamy fine sand.
6. Lithologic discontinuity – contrasting soil materials at 40 and 100 cm (2Bwb and 3Cgb horizons).
ADDITIONAL
DATA:
National Cooperative Soil Survey