Print Date:  

06/15/2004

Description Date:  

09/14/2000

Describer:  

Mike Bradley

 

Site ID:  

Ninigret059

Site Notes:  

Bucket Auger

Pedon ID:  

Ninigret059

Pedon Notes:  

 

Lab Source ID:  

URI

Lab Pedon #:  

 

 

Soil Name as Described/Sampled:  

Mid-Lagoon Channel

Soil Name as Correlated:  

 

Classification:  

Typic Endoaquents

 

 

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:  

Ningiret Pond, Charlestown, RI Southeast of Grassy Point

Legal Description:  

 

 

Latitude:  

41 degrees 21 minutes 36.38 seconds north

Longitude:  

71 degrees 39 minutes 12.70 seconds west

Datum:  

NAD83

UTM Zone:  

19

UTM Easting:  

278043 meters

UTM Northing:  

4582131 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; 30 percent mixed rock fragments and 1 percent shell fragments; clear.

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

C1--24 to 40 centimeters; sand; very dark gray (5Y 3/1) mottles; abrupt.

2C--40 to 50 centimeters; very dark gray (5Y 3/1), coarse sand; 60 percent mixed rock fragments.

Map Unit Description (Bradley Stolt):

Gch(D) – Mid-lagoon Channel, > 6% slopes:   These soils are found in a mid-lagoon channel which is the primary conduit of tidal water to and from the west basin of Ninigret Pond.  The subaqueous soils of this unit are dominated by black and dark olive gray loamy sand and coarse sand with 15 – 60% gravel and cobbles in almost all horizons.  Typically, ‘A’ horizons display black iron mono-sulfide coatings.  These soils classify as Typic Endoaquents.  Water depths are the deepest in Ninigret Pond (1.4 m – 2.3 m) and slopes are steep (>10%) to the channel bottom.  Eelgrass is absent.

Field Observation:

Depth (cm)

Boundary

Field

n-value

Munsell

Munsell

Redox features

Field

Shell

Notes

lower

Dist.

Texture

 

Color

Color

Color/Conc.

Coarse

Frags %

 

boundary

 

Class

 

(matrix)

Name

 

Frags %

 

 

8

c

grlcos

 

5Y 2.5/1

black

 

30%

< 1%

 

*1

24

a

vgrcos

 

5Y 3/1

very dark gray

 

45%

1%

 

40

a

s

 

5Y 4/2

olive gray

 

 

 

*2

50

 

vgrcos

 

5Y 3/1

very dark gray

 

60%

 

 

*1. Annelid activity

*2.  Common mottles of 5Y 3/1

Laboratory 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

40

1.5

15.4

27

19.7

22.5

6.7

91.3

5.7

3

vgrcos

AC

24

54.7

0.62

28

29.5

13.5

16.7

4.6

92.3

4.7

3

vgrcos

C1

40

6.46

0

4.8

19.4

30

26

15.4

95.6

3.4

1

s

2C

50

48.29

0.03

28.8

32

16.5

13

5.9

96.2

2.8

1

vgrcos

Chemical Properties:

Horizon

Depth   (cm)

Total Nitrogen (%)

AVS (ug/g)

CRS (ug/g)

CaCO3 (%)

Organic Carbon (%)

A1

8

0.046

17

326

0.407

0.733

AC

24

0.040

0.0

138.9

0.524

0.486

C1

40

0.000

0.0

84.5

0.293

0.358