Print Date:  

06/15/2004

Description Date:  

09/18/2000

Describer:  

Mike Bradley

 

Site ID:  

VBH

Site Notes:  

Vibracore Description

Pedon ID:  

VBH

Pedon Notes:  

 

Lab Source ID:  

URI

Lab Pedon #:  

 

 

Soil Name as Described/Sampled:  

Mainland Cove

Soil Name as Correlated:  

 

Classification:  

Thapto-Histic Hydraquents

 

Pedon Type:  

 

Pedon Purpose:  

research site

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

Legal Description:  

 

 

Latitude:  

41 degrees 21 minutes 49.34 seconds north

Longitude:  

71 degrees 39 minutes 17.06 seconds west

Datum:  

NAD83

UTM Zone:  

19

UTM Easting:  

277954 meters

UTM Northing:  

4582534 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:  

water cover

Secondary Earth Cover:  

 

Plant Association Name:  

 

Existing Vegetation:  

 

 

Parent Material:  

Silty Estuarine Sediment

Bedrock Kind:  

 

Bedrock Depth:  

 

Bedrock Hardness:  

 

Bedrock Fracture Interval:  

 

 

Surface Fragments:  

 

 

Particle Size Control Section:  

 

 

Diagnostic Features:  

 

 

Restrictions

Top Depth (cm)

Bottom Depth (cm)

Restriction Kind

Restriction Hardness

 

Slope (%)

Elevation (meters)

Aspect (deg)

MAAT (C)

MSAT (C)

MWAT (C)

MAP (mm)

Frost Free Days

Drainage Class

Slope Length (meters)

Upslope Length (meters)

 

 

 

 

 

 

 

 

very poorly

 

 

 

Profile Description:

A1--0 to 18 centimeters; black (5Y 2.5/1), silt loam; clear.

AC--18 to 38 centimeters; very dark gray (5Y 3/1), silt loam; 1 percent shell fragments; clear.

C1--38 to 63 centimeters; very dark gray (5Y 3/1), sandy loam; 15 percent shell fragments; clear.

C2--63 to 78 centimeters; very dark gray (5Y 3/1), sandy loam; abrupt.

C3--78 to 83 centimeters; very dark gray (10YR 3/1), sandy loam; abrupt.

2Oeb--83 to 115 centimeters; black (7.5YR 2.5/1); clear.

2Oab--115 to 124 centimeters; black (7.5YR 2.5/1), silt loam.

Map Unit Description (Bradley Stolt):

Mc(A) – Mainland Cove, 1 – 2% slopes:  These soils are found in protected coves along the mainland shoreline.  The subaqueous soils of this unit are characterized by black, very dark gray, and dark gray, loamy sand, fine sandy loams and silt loam.   Two types of buried organic horizons (30% organic carbon) are found at depths of 50 cm – 80 cm.  Reddish black organic horizons are probably remnants of buried Pleistocene-aged Atlantic white cedar swamps.  The dramatic decrease in salinity of these layers supports this origin.  Yellowish black buried organic horizons are probably indicative of salt marsh peat.  Most soils are classifed as Thapto-histic Hydraquents.  Water depths are 1.4 m or less.  Submerged topography is gently sloping  (1%).  Eelgrass cover is moderate (10-50%).

Field Description:

Horizon

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 %

 

 

A1

18

c

sil

>> 1

5Y 2.5/1

black

 

 

 

 

AC

38

c

sil

>> 1

5Y 3/1

very dark gray

 

 

< 1%

*1

C1

63

c

sl

 

5Y 3/1

very dark gray

 

 

15%

*2

C2

78

a

sl

 

5Y 3/1

very dark gray

 

 

 

 

C3

83

a

sl

 

10YR 3/1

very dark gray

 

 

 

*3

2Oeb

115

c

NA

 

7.5YR 2.5/1

black

 

 

 

*4

2Oab

124

 

sil

 

7.5YR 2.5/1

black

 

 

 

 

*1.  Fine med com plant parts.  Wood fragment at AC/C1 boundary.

*2.  Oyster shell at 48 cm.

*3.  Mixture of C2 and Oeb.

*4.  Wood fragment at 106 cm.

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

18

0

0

0.4

0.5

0.4

2

20

23.3

54.4

22.3

sil

AC

38

0

0.16

0.5

1.6

0.9

7.2

14.7

24.9

52.8

22.3

sil

C1

63

1.25

66.06

5

21.3

20

0.4

33

79.7

18.2

2.1

lcos

C2

78

3.67

0

5.9

23

20

0.2

33

82.1

16.2

1.7

lcos

C3

83

0

0

5.2

12.6

18.3

3

32

71.1

26.5

2.4

sl

2Oeb

115

0

0

 

 

 

 

 

 

 

 

 

2Oab

124

0

1.36

 

 

 

 

 

 

 

 

 

Chemical Properties:

Horizon

Depth   (cm)

Total Nitrogen (%)

AVS (ug/g)

CRS (ug/g)

CaCO3 (%)

Organic Carbon (%)

A1

18

0.415

78.0

2131.0

1.752

6.452

AC

38

0.505

0.6

168.2

2.025

7.426

C1

63

0.109

NA

NA

0.496

1.577

2Oeb

115

1.859

NA

NA

2.783

29.634

2Oab

124

0.855

NA

NA

1.079

12.151