S05-RI-009-001A / RI009-2005-001A-NP
Washover fan slope; Ninigret Pond, Charlestown, RI
The Nagunt series consists of very deep, subaqueous soils on washover
fan flats and washover fan slopes in coastal lagoons. Nagunt soils are
formed in fine sandy to sandy marine deposits that are deposited as a
result of washover events. Buried surface horizons and stratification
are often identified. Slope ranges from 0 to 6 percent.
Pedon Description:
A1--0 to 14 centimeters; black (5Y 2.5/1) interior and olive gray (5Y
4/2) oxidized, fine sand; massive; very friable, nonsticky, nonplastic;
nonfluid; 1 percent flat subangular shell fragments; negative reaction to
alpha-alpha' dipyridyl; Macro algea on surface, algal filaments and
reed fragments throughout; clear; Lab sample # 06N02244.
C1--14 to 36 centimeters; very dark gray (5Y 3/1) interior, fine sand;
massive; very friable, nonsticky, nonplastic; nonfluid; 2 percent flat
subrounded less than 4-millimeter shell fragments; negative reaction to
alpha-alpha' dipyridyl; Complete Quahog (Venus mercenaria) shell 4
cm in diameter. Common very fine algal filaments throughout; gradual;
Lab sample # 06N02245.
C2--36 to 73 centimeters; dark gray (5Y 4/1) interior, loamy fine sand;
massive; very friable, nonsticky, nonplastic; nonfluid; 2 percent very
coarse faint cylindrical gray (5Y 5/1), moist, iron depletions with clear
boundaries in matrix; negative reaction to alpha-alpha' dipyridyl; Few
very fine algae filaments. Redox depletion color 5Y 5/1, 3 cm wide.;
clear; Lab sample # 06N02246.
C4--73 to 109 centimeters; dark gray (5Y 4/1) interior, fine sand;
massive; very friable, nonsticky, nonplastic; nonfluid; 2 percent flat
angular shell fragments; negative reaction to alpha-alpha' dipyridyl; 5
cm Oyster shell, slightly weathered. Few very fine algal filaments.
abrupt; Lab sample # 06N02247.
S05-RI009-001A_Nagunt.doc Nagunt
Cg1--109 to 121 centimeters; gray (5Y 5/1) interior, fine sand; massive; very friable,
nonsticky, nonplastic; nonfluid; negative reaction to alpha-alpha' dipyridyl; abrupt; Lab
sample # 06N02248.
2Ab1--121 to 155 centimeters; very dark gray (5Y 3/1) interior, fine sandy loam;
massive; very friable, nonsticky, nonplastic; nonfluid; 1 percent flat subangular shell
fragments; Few very fine algal filaments, slight H2S odor.; clear; Lab sample #
06N02249.
2Ab2--155 to 165 centimeters; very dark gray (5Y 3/1) interior, silt loam; very friable,
slightly sticky, nonplastic; slightly fluid; 1 percent flat subangular shell fragments;
negative reaction to alpha-alpha' dipyridyl; Horizon is interpreted as lagoon bottom
organic silts (MB), few very fine algal filaments, slight H2S odor. Designation changed
to 2Ab2 due to change in overlying horizon; Lab sample # 06N02250.
(tape in cm)
Laboratory Data:
Horizon
A1
C1
C2
C3
Cg4
Ag1
2Ab
Depth (cm)
0-14
14-36
36-73
73-94
94-109
109-121
121-155
pH
6.3
6.1
4.7
6.3
3.7
4.3
5
%C
0.98
1.21
0.78
0.25
0.11
0.49
1.00
%N
0.17
0.16
0.12
0.10
0.04
0.09
0.14
%S
0.14
0.32
0.31
0.16
0.14
0.32
0.74
Ca
3.0
4.2
1.3
2.9
0.4
1.2
2.7
Mg
5.7
6.2
4.7
2.6
2.3
4.0
7.1
Na
17.1
20.0
15.6
9.6
9.4
13.4
22.7
K
0.7
0.7
0.7
0.3
0.4
0.7
1.8
Horizon
A1
C1
C2
C3
Cg4
Ag1
2Ab
%VCS
0.1
0.1
0.1
0.9
0.0
0.4
0.1
%CS
0.4
0.4
1.0
4.4
0.3
0.6
0.3
%MS
2.4
1.9
7.1
16.7
2.3
2.8
1.1
%FS
58.9
47.4
36.2
41.6
70.4
34.0
2.6
%VFS
25.1
35.6
36.5
28.8
24.3
34.0
23.1
%Sand
87
85
81
92
97
72
27
%Silt
11
12
16
7
2
26
65
%Clay
3
3
3
1
1
3
8
Texture
fine sand
fine sand
loamy fine sand
fine sand
fine sand
fine sandy loam
silt loam
General Information
General Description:
109 cm marine sands over buried lagoon bottom
material
S05-RI009-001A_Nagunt.doc Nagunt
Location Description:
Location Map:
Description Date:
Describer:
Pedon ID:
Pedon Notes:
Lab Source ID:
Lab Pedon #:
Soil Name as Described/Sampled:
Soil Name as Correlated:
Classification(10th edition):
Classification (Wassents):
Water Depth (feet):
Primary Earth Cover:
Existing Vegetation:
Parent Material:
Particle Size Control Section:
Diagnostic Features:
Location Information
Country:
State:
County:
MLRA:
Soil Survey Area:
Quad Name:
Latitude:
Longitude:
Datum:
UTM Zone:
UTM Easting:
UTM Northing:
Ninigret Pond, Charlestown, RI. West Bain
along the storm surge platform slope.
TopoZone - USGS Quonochontaug (RI,MA)
Topo Map
09/01/2005
J. Turenne, M. Bradley
S05-RI-009-001A
Rossfelder Vibracore sample (4 in PVC tube),
water temperature = 74.3F
Mica flakes found throughout pedon. No to
slight H2S odor when described, slight odor
detected throughout when split open.; Soil Name
As Sampled changed from Back Barrier Slope to
Washover Fan Slope in 2007.
NSSL
06N0547
Washover Fan Slope
Nagunt
Mixed, mesic, Typic Psammaquents
Mixed, mesic, Fluventic Psammowassents
-3
water cover
Sandy washover fan deposits sandy marine
deposits derived from igneous, metamorphic and
sedimentary rock over Silty estuarine deposits
silty marine deposits derived from igneous,
metamorphic and sedimentary rock
25 to 100 cm.
Reduced matrix 0-155 cm; Sulfidic materials 94109
United States
Rhode Island
WASHINGTON
149B -- Long Island-Cape Cod Coastal Lowland
RI600 -- State of Rhode Island: Bristol, Kent,
Newport, Providence, and Washington Counties
Quonochontaug, Rhode Island
41 degrees 21 minutes 10.00 seconds north
71 degrees 40 minutes 7.00 seconds west
NAD83
19
276757 meters
4581413 meters
S05-RI009-001A_Nagunt.doc Nagunt
Physiographic Division:
Physiographic Province:
Physiographic Section:
State Physiographic Area:
Local Physiographic Area:
Atlantic Lowland
Coastal Plain
Embayed section
Ninigret Pond
Location Map:
S05-RI009-001A_Nagunt.doc Nagunt