Print Date:  

06/15/2004

Description Date:  

09/13/2000

Describer:  

Mike Bradley

 

Site ID:  

Ninigret057

Site Notes:  

Bucket Auger

Pedon ID:  

Ninigret057

Pedon Notes:  

 

Lab Source ID:  

URI

Lab Pedon #:  

 

 

Soil Name as Described/Sampled:  

Glacial Fluvial Outcrop Island

Soil Name as Correlated:  

 

Classification:  

 

 

 

Pedon Type:  

 

Pedon Purpose:  

Research – Masters Thesis

Taxon Kind:  

 

Associated Soils:  

 

 

Location Information

Country:  

USA

State:  

RI

County:  

Washington

MLRA:  

149B

Soil Survey Area:  

 

Quad Name:  

Quonochataug

 

Location Description:  

Ninigret Pond, Charlestown, RI Cresent shaped shoal north of Marshneck Point

Legal Description:  

 

 

Latitude:  

41 degrees 21 minutes 52.38 seconds north

Longitude:  

71 degrees 38 minutes 49.38 seconds west

Datum:  

NAD83

UTM Zone:  

19

UTM Easting:  

278600 meters

UTM Northing:  

4582608 meters

 

Physiographic Division:  

Atlantic Lowland

Physiographic Province:  

Coastal Plain

Physiographic Section:  

Embayed Section

State Physiographic Area:  

 

Local Physiographic Area:  

Ninigret Pond

 

Geomorphic Setting:  

 

Upslope Shape:  

 

Cross Slope Shape:  

 

 

Primary Earth Cover:  

 

Secondary Earth Cover:  

 

Plant Association Name:  

 

Existing Vegetation:  

 

 

Parent Material:  

Sandy estuarine sediments

Bedrock Kind:  

 

Bedrock Depth:  

 

Bedrock Hardness:  

 

Bedrock Fracture Interval:  

 

 

Surface Fragments:  

 

 

Particle Size Control Section:  

 

 

Diagnostic Features:  

 

 

 

Profile Description:

A1--0 to 8 centimeters; black (5Y 2.5/1), loamy coarse sand; 35 percent mixed rock fragments and 3 percent shell fragments; clear.

AC--8 to 24 centimeters; coarse sand; 45 percent mixed rock fragments and 1 percent shell fragments; clear.

C1--24 to 60 centimeters; coarse sand; 55 percent mixed rock fragments and 20 percent shell fragments; clear.

C2--60 to 70 centimeters; coarse sand; 40 percent mixed rock fragments and 3 percent shell fragments.

Map Unit Description (Bradley Stolt):

Gi(B) – Glacial Fluvial Outcrop Island, 2 – 4% slopes:  These soils are found on glacial fluvial outcrops found in the middle of Ninigret Pond and in mainland coves.  They are islands of glacial fluvial material surrounded by the high N-value Lagoon Bottom or Mainland Cove deposits. The subaqueous soils of this unit are dominated by black and dark olive gray loamy sand and coarse sand with 5– 60% gravels and cobbles in almost all horizons.  Typically, surface ‘A’ horizons display black iron mono-sulfide coatings.  Soils are typically classified as Sodic Endoaquents with inclusions of Typic Fluvaquents.  Shell fragments larger than 2 mm may comprise > 20% of surface horizons.  Water depths range from 0.8 m to 1.4 m along the edges of the unit.  Submerged topography is moderately sloping toward deeper portions of the pond.  Eelgrass cover is low (<10%).

Field Description:

Horizon

Depth (cm)

Boundary

Field

n-value

Munsell

Munsell

Redox features

Field

Shell

 

lower

Dist.

Texture

 

Color

Color

Color/Conc.

Coarse

Frags %

 

boundary

 

Class

 

(matrix)

Name

 

Frags %

 

A

8

c

grlcos

 

5Y 2.5/1

black

 

35%

3%

AC

24

c

vgrcos

 

5Y 3/1

very dark gray

 

45%

1%

C1

60

c

vgrcos

 

5Y 4/1

dark gray

 

55%

20%

C2

70

 

vgrcos

 

5Y 3/2

dark olive gray

 

40%

3%

Lab Analysis:

Horizon

Depth   (cm)

% Coarse Frags

% Shell Frags

% VCO   (1-2 mm)

% CO    (1-0.5 mm)

% M    (0.5-0.25 mm)

% F       (0.25-0.1 mm)

% VF     (0.1-0.05 mm)

% Total Sand

% Silt

% Clay

USDA Texture Class

A1

8

34.42

3.12

19.2

32.3

8.9

15

15.3

90.7

7.3

2

grcos

AC

24

55.34

0.66

34.2

32.7

7.9

4.4

14.2

93.4

4.6

2

vgrcos

C1

60

42.19

14.86

30.9

34

9

0.5

13

87.4

8.6

4

vgrlcos

C2

70

41.68

3.6

35

40

9.8

1

10

95.8

3.2

1

vgrcos

Chemical Properties:

Horizon

Depth   (cm)

Total Nitrogen (%)

AVS (ug/g)

CRS (ug/g)

CaCO3 (%)

Organic Carbon (%)

A1

8

0.000

6

298

0.806

0.523

AC

24

0.000

0.0

95.3

0.554

0.575

C1

60

0.029

0.0

31.2

8.988

1.286