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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-7

SHIP: R/V Atlantic Twin
LOCATION: central Long Island Sound
LATITUDE: 41o 08.38' N
LONGITUDE: 72o 05.61' W
LORAN: 26570.1, 43998.5
COMMENTS: Seismic line for this core is Line AT#6 (sparker). This lines runs from 1341-1357 hrs. Core into outwash (site II-2 on uniboom record line 6, at 1142, UCONN 84-1). Section 1 - surface scrapped perpendicular to long axis on working half; sections 1B and 2A in same D-tube; section 2B - clay/sand contact at top of section.
PENTROMETER RECORD: Very rapid 0-10'; moderate 11,12,13,14', very slow 15'-end
0-150 cm (Section 1A) - Dark olive gray, 5Y 3/2, clayey silt and very fine sand, with less than 5% medium sand, occasional pieces of gravel, shells and shell fragments up to 1 cm in width, scattered zones of fine and medium sand; 30-38 cm: sandy silt (15% sand, 71% silt, 14% clay).
150-180 cm (Section 1B) - Dark olive gray, 5Y 3/2 clayey silt with some very fine sand, a pebble at 167 cm and zones of fine to medium sand and silt.
180-260 cm (Section 2A) - Dark olive gray, 5Y 3/2 sediments getting increasingly coarser toward medium to coarse sand, turbidites (?), scattered pebbles.
260-370 cm (Section 2B) - 260-265 cm: dark olive gray, 5Y3/2, silty clay and fine sand with lenses of coars sand, medium sand, and silt, sharp lower contact. 265-370 cm: Sand, well sorted, varying textures from fine sand to medium sand, textural layering apparent that corresponds to slight variations in color (dark - 7.5YR 3/2; light - 7.5 YR 4/2).

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