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U.S. Geological Survey Open-File Report 02-002

Geological Framework Data from Long Island Sound, 1981-1990:

A Digital Data Release

CERC Technical Report 81-3

Table 3.

 

Characteristics of sand and gravel deposits

Designation Core No.  Water Depths (m) Thickness (m) Mean grain size (mm) Est. Volume (Million m3) REMARKS
A 31 11 to 14 2.7 0.25 to 0.27 1 Deposit consists of two irregular ridges off Matinicock Point
B 36 8 to 18 4.3 0.60 to 0.90 6 Shoal about 6.4 km S. of Stamford is glacial till on a bedrock high
C 7A 7 to 18 3.1 0.50 to 0.90 4 Cable and Anchor Reef S. of Norwalk Islands is glaciofluvial sediment on a bedrock high
D 26, 26B, 38 6 to 18 2.7 0.50 to 1.20 7 Shoal off Eatons Neck is composed of Pleistocene sands
E 9 12 to 20 3.9 0.34 to 1.10 4 Shoal about 5km SE. of Norwalk Islands consists of steeply dipping forset strata
F 12 to 15, 49, 53A, 54 6 to 12 3.9 0.28 to 0.62 37 Shoal off Bridgeport is a glaciofluvial delta with steeply dipping forset strata
G 21 6 to 15 3.3 0.25 to 1.00 5 Shoal off Crane Neck is composed of Pleistocene sands
H 78 6 to 15 2.7 0.61 to 0.89 5 Deposit consists of glaciofluvial sands
I 57 8 to 9 3.7 0.31 to 1.10 10 Shoal S. of Milford overlies the buried ancestral Quinnipiac River channel
J 76 6 to 17 3.5 0.47 to 0.99 7 Shoal is well stratified with forset strata
K 58A 6 to 9 2.1 0.43 to 0.48 3 Townshend Ledge is composed of glaciofluvial sediment on a bedrock high
L 75 6 to 18 3.8 -----------1 40 Shoal has forset strata prograding west
M 72, 74 6 to 17 2.7 0.34 to 0.79 54 Shoal consists of Pleistocene glaciofluvial sands; sand waves with 5-m relief are present
N 64 to 67A 2 to 6 2.7 0.43 to 0.84 6 Long Sand Shoal is composed of stratified glaciofluvial and estuarine sands overlying bedrock

1 Data Unknown


Department of the Interior > U.S. Geological Survey > Coastal and Marine Geology Program > Long Island Sound Studies
Contact: L.J. Poppe (lpoppe@usgs.gov")
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