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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: AT88-3
| SHIP: | R/V Atlantic Twin |
| CRUISE: | AT-88 |
| CORE: | AT88-3 |
| LENGTH: | 417 cm |
| DATE OF CORE: | 9/88 |
| DESCRIBED BY: | N. Neff |
| LOCATION: | Southeast of Norwalk Island, Long Island Sound |
| LATITUDE: | 41o 03.2' N |
| LONGITUDE: | 73o 18.5' W |
| LORAN: | 26750.1, 43990.0 |
| WATER DEPTH (m): | 17 |
| DATE SPLIT: | 5/89 |
| 0 - 68 cm - | Dark olive gray, 5Y 3/2, stiff sandy silt grading down - section to silty sand; few shell fragments in upper 20 cm. Medium sand layer 2 - 4 cm thick at 30 cm. Sharp, horizontal lower contact. |
| 68 - 170 cm - | Light brownish gray, 10 YR 6/2, hard medium to coarse sand. Few gravel clasts at 75 - 85 cm. Gradational lower contact. |
| 170 - 190 cm - | Grayish brown, 10 YR 5/2, firm, gravelly sand. Pebbles scattered throughout; largest clast: 1 cm. Gradational lower contact. |
| 190 - 332 cm - | Light brownish gray, 10 YR 6/2, firm, medium to coarse sand. Few gravel clasts scattered throughout. Gradational lower contact. |
| 332 - 361 cm - | Grayish brown, 10 YR 5/2, firm, gravelly sand. Few pebbles scattered throughout; largest clast: 2 cm. Gradational lower contact. |
| 361 - 417 cm - | Lite brownish gray, 10 YR 6/2, hard, medium to coarse sand. 564 - 385 cm: faint, slightig finer - grained, dark, inclined laminae. 385 - 388 cm: inclined, gravelly sand layer. 388 - 417 cm: faint laminae. 398 cm: dusky red (10 R 3/2), finer - grained laminae, less than I cm thick, very distinct. |