(tape in cm)

S05-RI-009-012A / RI009-2005-012A-NP

 Shallow Lagoon Bottom; Ninigret Pond, Charlestown, RI

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Pedon Description

Lab Data

Sampling Information

Location Map

The Fort Neck series consist of very deep, subaqueous soils in low energy coastal lagoons and channels.  The Fort Neck soils are formed in less than 100 cm marine silts over marine sands or stratified sand and gravel.  Slope ranges from 0 to 5 percent. 

Pedon Description:

Ag--0 to 9 centimeters; black (5Y 2.5/1) interior, silt; 7 percent sand; 92 percent silt; 1 percent clay; massive; very friable, noncemented, slightly sticky, nonplastic; very fluid; low toughness; extremely low penetration resistance; low excavation difficulty; common very fine roots throughout; 1 percent flat angular shell fragments; negative reaction to alpha-alpha' dipyridyl; electrical conductivity of 39 mmhos/cm by ec meter, saturated paste; moderately alkaline, pH 7.9, pH meter, saturated paste; clear; Lab sample # 17.

CAg--9 to 34 centimeters; 60 percent very dark gray (5Y 3/1) interior and 40 percent black (5Y 2.5/1) interior, silt loam, gray (5Y 6/1) interior, dry; 9 percent sand; 67 percent silt; 25 percent clay; massive; very friable, very hard, slightly sticky, nonplastic; slightly fluid; low excavation difficulty; negative reaction to alpha-alpha' dipyridyl; electrical conductivity of 34 mmhos/cm by ec meter, saturated paste; moderately alkaline, pH 8, pH meter, saturated paste; Vertical oriented reed plant fragments observed, interpreted as eelgrass.; abrupt; Lab sample # 18.

Cg1--34 to 62 centimeters; very dark gray (5Y 3/1) interior, very fine sandy loam, gray (5Y 6/1) interior, dry; 60 percent sand; 23 percent silt; 17 percent clay; massive; very friable, very hard, nonsticky, nonplastic; slightly fluid; low toughness; very low penetration resistance; low excavation difficulty; 1 percent flat angular shell fragments; negative reaction to alpha-alpha' dipyridyl; electrical conductivity of 33 mmhos/cm by ec meter, saturated paste; moderately alkaline, pH 8, pH meter, saturated paste; Very thin algal filaments observed.; abrupt; Lab sample # 19.

Cg2--62 to 78 centimeters; loamy fine sand; 88 percent sand; 10 percent silt; 2 percent clay; massive; very friable, nonsticky, nonplastic; nonfluid; low toughness; low penetration resistance; low excavation difficulty; 1 percent coarse prominent irregular iron-manganese masses with sharp boundaries in matrix and 1 percent fine and medium distinct irregular iron depletions with sharp boundaries infused into matrix adjacent to pores; 1 percent nonflat subangular granite fragments; negative reaction to alpha-alpha' dipyridyl; electrical conductivity of 25 mmhos/cm by ec meter, saturated paste; neutral, pH 7, pH meter, saturated paste; abrupt; Lab sample # 20.

2Cg3--78 to 85 centimeters; olive gray (5Y 4/2) interior, gravelly coarse sandy loam, light gray (5Y 7/1) interior, dry; 64 percent sand; 33 percent silt; 3 percent clay; massive; friable, very hard, nonsticky, nonplastic; nonfluid; 23 percent nonflat subrounded granite fragments; positive reaction to alpha-alpha' dipyridyl; electrical conductivity of 21 mmhos/cm by ec meter, saturated paste; slightly alkaline, pH 7.4, pH meter, saturated paste; At boundary with Cg2 identified 5 percent marsh plant fragments. Horizon showed a negative reaction to alpha-alpha when moist but a positive reaction was observed when  (tape in cm)                     dried.; abrupt; Lab sample # 21.

3CA1--85 to 103 centimeters; very dark grayish brown (2.5Y 3/2) interior, very gravelly coarse sandy loam; single grain; loose, nonsticky, nonplastic; nonfluid; 53 percent nonflat subrounded granite fragments; electrical conductivity of 20 mmhos/cm by ec meter, saturated paste; slightly alkaline, pH 7.8, pH meter, saturated paste; Plant fragments (thin hairs) origin unknown.; clear; Lab sample # 22.

3C1--103 to 121 centimeters; olive gray (5Y 4/2) interior, stratified very gravelly coarse sandy loam, gray (2.5Y 6/1) interior, dry; 74 percent sand; 24 percent silt; 2 percent clay; single grain; loose, nonsticky, nonplastic; nonfluid; 60 percent nonflat subrounded granite fragments; electrical conductivity of 11 mmhos/cm by ec meter, saturated paste; moderately alkaline, pH 7.9, pH meter, saturated paste; abrupt; Lab sample # 23.

4C1--121 to 133 centimeters; coarse sand; 91 percent sand; 7 percent silt; 2 percent clay; single grain; electrical conductivity of 13 mmhos/cm by ec meter, saturated paste; moderately alkaline, pH 8, pH meter, saturated paste; Varigated color patterns, unsure of origin: 1 cm 2.5Y5/4 then 4 cm 2.5Y 5/2, 1 cm N 2/0 then 10YR 4/6 - see photo.; abrupt; Lab sample # 26.

4C2--133 to 138 centimeters; olive brown (2.5Y 4/3) interior, stratified very gravelly coarse sand; 97 percent sand; 3 percent silt; 0 percent clay; single grain; loose, nonsticky, nonplastic; nonfluid; 35 percent nonflat subrounded granite fragments; electrical conductivity of 19 mmhos/cm by ec meter, saturated paste; moderately alkaline, pH 8.1, pH meter, saturated paste; Lab sample # 27.

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