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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

Visual Core Description: LISAT-2

SHIP: R/V Atlantic Twin
CRUISE: AT-84
CORE: LISAT-2
LENGTH RECOVERED: 276 cm
PENETRATION: 29'
NUMBER OF SECTIONS: 4
LOCATION: Stratford Shoal, western Long Island Sound
LATITUDE: 41o 02.75' N
LONGITUDE: 73o 09.3' W
LORAN: 26670.5, 43972.4
COMMENTS: Seismic line for this core is Line AT#1 (sparker). This lines runs from 1010-1014 hrs. Core is into confused layer (site III-4 on line 19, UCONN84-1). Section 1 cut, H2S and shells; section 2A shells; section 4 void at the top-NOT cut.
PENTROMETER RECORD: Rapid 0-9'; moderate 10,11,12'; slow 12-18'; moderate 19-20'; slow 20'-end
0-156 cm (Section 1) - Olive gray , 5Y 4/2, silty sand and sandy silt; varying percentages of sand. Shell hash in top 23 cm. 110-126 cm: lots of large shell fragments; gradational contact to silty sand at 130 cm. Large oyster shell and other shells at 152 cm.
156-241 cm (Section 2A) - dark grayish brown, 2.5Y 4/2, fine sand and silt, with mottling of dark olive gray, 5Y 3/2 clayey silt and fine sand; gradational contact with next lower unit; scattered large shells. 202-222: dark grayish brown, 2.5Y 4/2, with mottling of 5Y 5/3 fine -medium sand. 222-241 cm: dark grayish brown 2.5Y 4/2 fine sand.
241-326 cm (Section 2B) - grayish brown, 2.5Y 5/2, fine sand; sharp contact; no shells; gravel at contact. 252-271 cm: light brownish gray, 2.5Y 6/2, well sorted, cleaner sand - fine sand; 5% medium sand. 271-295 cm: 5 or 6 cycles of layering, coarse (fine sand) grading upward to fine (silty clay), color changes. 295-320 cm: 1-2 cm layering by color only of sand; general color light brownish gray, 2.5Y 6/2, fine-medium sand. 320-326 cm: dark grayish brown, 2.5Y 4/2, fine sand.
326-410 cm (Section 3A) - dark olive gray, 2.5Y 3/2, fine sand, very micaceous. 331-335 cm: black, 5Y 2.5/2, fine sand, very micaceous, organic fabric, no odor. 335-343 cm: dark grayish brown, 2.5Y 4/2, fine sand, less mica, sharp contact. 343-410 cm: dark gray, 5Y 4/1, to very dark gray, 2.5Y 3/2, silt and silty clay (77% silt, 22% clay at 360-366 cm), presumably lake clay, totally disturbed and distorted, no couplets recognizable, "flow in", however colors are distinguishable.
410-494 cm (Section 3B) - dark gray, 5Y 4/1, to very dark gray, 2.5Y 3/2, silt and silty clay, presumably lake clay, totally disturbed and distorted, no couplets recognizable, "flow in", however colors are distinguishable.
494-643 cm (Section 4) - dark gray, 5Y 4/1, to very dark gray, 2.5Y 3/2, silt and silty clay, presumably lake clay, totally disturbed and distorted, no couplets recognizable, "flow in", however colors are distinguishable.


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