LOCATION NAGUNT RI+CT MA NY

Established Series
Revised JDT-MPB-MS-MKP-DCP
06/2023

NAGUNT SERIES

MLRA(s)--144A, 149B
Depth class--Very deep
Drainage class--Subaqueous
Water depth range--1 to 273 centimeters
Parent material--Sandy lagoonal deposits
Geomorphic location--Washover fan flats and slopes
Slope range--0 to 15 percent
Mean annual air temperature--10 degrees C (50 degrees F)
Mean annual precipitation--1295 millimeters (51 inches)

TAXONOMIC CLASS: Mixed, mesic Sulfic Psammowassents

TYPICAL PEDON: Nagunt sand on a north facing, 1 percent convex slope on a washover fan flat under 50 centimeters of tidal estuarine water. Tidal range is 24 centimeters. (Colors are for moist soil unless otherwise stated).

A--0 to 14 centimeters; light olive brown (2.5Y 5/3) sand; light greenish gray (10Y 7/1) dry; single grain; nonfluid; strongly saline; 1 percent fine shell fragments; moderately alkaline (pH 7.9); slightly alkaline (pH 7.6) oxidized pH; abrupt boundary. (0 to 18 centimeters thick.)

Cg1--14 to 33 centimeters; gray (2.5Y 6/1) sand; single grain; nonfluid; strongly saline; 2 percent fine shell fragments; 10 percent plant and macroalgal fragments; moderately alkaline (pH 7.9); neutral (pH 6.8) oxidized pH; clear boundary.

Cg2--33 to 41 centimeters; 50 percent gray (5Y 5/1) and 50 percent dark gray (5Y 4/1) fine sand; single grain; nonfluid; strongly saline; 1 percent fine shell fragments; slightly alkaline (pH 7.8); slightly alkaline (pH 7.4) oxidized pH; abrupt boundary. (Combined thickness of Cg horizons is 27 to 138 centimeters.)

Aseb--41 to 54 centimeters; dark gray (2.5Y 4/1) fine sand; single grain; nonfluid; strongly saline; 1 percent fine shell fragments; 2 percent medium plant fragments throughout; moderately alkaline (pH 8.1); extremely acid (pH 3.9) oxidized pH; clear boundary. (0 to 34 centimeters thick.)

C'g--54 to 69 centimeters; gray (5Y 6/1) sand; single grain; strongly saline; nonfluid; 1 percent fine shell fragments; moderately alkaline (pH 8.2); neutral (pH 6.6) oxidized pH; clear boundary. (0 to 69 centimeters thick.)

A'seb--69 to 74 centimeters; dark olive gray (5Y 3/2) sand; massive; very friable; nonfluid; strongly saline; 1 percent fine shell fragments; moderately alkaline (pH 7.9); extremely acid (pH 3.9) oxidized pH; abrupt boundary. (0 to 18 centimeters thick.)

C''g1--74 to 106 centimeters; gray (5Y 6/1) sand; single grain; nonfluid; strongly saline; 1 percent fine and medium shell fragments; moderately alkaline (pH 7.9); strongly acid (pH 5.1) oxidized pH; clear boundary.

C''g2--106 to 123 centimeters; dark gray (5Y 4/1) sand; single grain; nonfluid; strongly saline; 1 percent fine shell fragments; few very fine plant fragments; moderately alkaline (pH 8.1); neutral (pH 6.9) oxidized pH; clear boundary.

C''g3--123 to 200 centimeters; gray (5Y 5/1) fine sand; single grain; nonfluid; strongly saline; 1 percent fine and medium shell fragments; moderately alkaline (pH 8.4); very strongly acid (pH 4.8) oxidized pH; clear boundary.

TYPE LOCATION: Washington County, Rhode Island; Town of Charlestown, West Basin of Ninigret Pond, about 590 feet north of East Beach Barrier, 4,200 feet southeast of Reed Point, 3,300 feet south of entrance to Foster Cove; . USGS topographic quadrangle: Quonochontaug, RI.

Latitude--41.3497238
Longitude-- -71.6788864
Datum--WGS84
Coordinate source--from hand-held GPS

RANGE IN CHARACTERISTICS:
Depth to bedrock--greater than 200 centimeters
Soil moisture--These soils are continuously inundated or exposed only during spring low tides.
Reaction throughout--Neutral to strongly alkaline (pH 6.6 to 9.0)
Oxidized reaction--Extremely acid to moderately alkaline (pH 3.5 to 8.4)
Electrical conductivity (1:5 soil-water, throughout--0.6 dS/m or greater
Depth to hypersulfidic / sulfidic materials (oxidized pH 4.0)--0 to 100 centimeters (must have a combined thickness of 15 centimeters or more)
Manner of failure throughout--nonfluid
Gravel and / or shell fragments throughout--0 to less than 35 percent

A horizon-
Hue--2.5Y to 10Y or is neutral
Value--2.5 to 5
Chroma--0 to 3
Texture--Loamy fine sand or coarser sometimes with mucky analogs

Cg or Cseg (where present) horizon-
Hue--2.5Y to 5Y or neutral
Value--3 to 6
Chroma--0 to 1
Texture--Loamy fine sand or coarser

Aseb horizon-
Hue--2.5Y to 5Y
Value--3 to 6
Chroma--0 to 2
Texture--Loamy fine sand or coarser sometimes with mucky analogs

COMPETING SERIES: Duvall Creek soils--occur in sub-estuaries in the Chesapeake Bay region on wave-built terrace landforms and have thicker hypersulfidic soil materials throughout.

GEOGRAPHIC SETTING:
Parent material--Sandy lagoonal deposits
Landscape--Coastal estuaries and lagoons
Landform--Washover fan flats and slopes
Slope--0 to 15 percent (0 to 2 percent on flats and 2 to 15 percent on sloping landforms)
Mean annual precipitation--1023 to 1320 millimeters (40 to 52 inches)
Mean annual air temperature--4 to 13 degrees C (39.2 to 55.4 degrees F)
Water salinity range--18 to 30 parts per thousand
Frost-free period--350 to 365 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Anguilla, Marshneck, Massapog, Napatree, Pishagqua, and Rhodesfolly soils.

Anguilla soils--are on mainland cove landforms and often have rock fragments greater than 35 percent in substratum horizons
Marshneck soils--are on flood-tidal delta slope landforms and have finer textured horizons
Massapog soils--are found on flood-tidal delta flats and do not have sulfidic materials within 100 centimeters of the soil surface.
Napatree soils--are found on mainland cove areas and have finer soil textures
Pishagqua soils--are on lagoon bottom landforms and also have finer soil textures throughout
Rhodesfolly--are on washover fan flats are slightly coarser textured and do not have sulfidic soil materials within 100 centimeters of the soil surface

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--Subaqueous
Saturated hydraulic conductivity--Moderately high to very high
Soil moisture regime--Peraquic
Soil is continuously inundated by saline and brackish water
USE AND VEGETATION:
Major uses--The area is used for recreational fishing and swimming. Commercial uses include shell fishing and aquaculture.
Native vegetation--Native vegetation includes eelgrass (Zostera marina) and widgeon grass (Ruppia maritma). Vegetation cover ranges from 0 in shallow and intertidal flats through 80 percent on the flat and sloping units of this soil. This soil supports benthic fauna such as tubeworms, clams, juvenile blue crabs, scallops and juvenile finfish.

DISTRIBUTION AND EXTENT:
General area--These soils are located along the Connecticut, Massachusetts, New York and Rhode Island coast.
Land Resource Regions--R - Northeastern Forage and Forest Region and S - Northern Atlantic Slope Diversified Farming Region
MLRA(s)--144A and 149B
Extent--Small

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Amherst, Massachusetts

SERIES ESTABLISHED: Washington County, Rhode Island, 2010.

REMARKS: This subaqueous series is mapped in areas previously mapped as water in the Connecticut, Massachusetts, New York and Rhode Island Soil Surveys.

Diagnostic horizons and features in this pedon include--Peraquic feature--The zone from 0 to 200 centimeters has positive soil water potential (permanently submerged) at the soil surface (under 2 meters of salt water).
Particle--size control section-The zone from 0 to 100 centimeters (0 to 40 inches)
Ochric epipedon--0 to 14 centimeters (0 to 6 inches, A horizon).
Sulfidic soil materials--within 100 centimeters of the mineral soil surface, 41 to 54 centimeters and 69 to 74 centimeters (Aseb and A'seb horizons).

ADDITIONAL DATA:
This pedon was sampled as S2005RI009002 by KSSL. Support pedons used to develop this series S2005RI009001 (sampled by KSSL), S2007RI009001 (sampled by the University of Rhode Island), and S2008RI009014 (sampled by the University of Rhode Island).

National Cooperative Soil Survey
U.S.A.