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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: AT88-7
| SHIP: | R/V Atlantic Twin |
| CRUISE: | AT-88 |
| CORE: | AT88-7 |
| LENGTH: | 515 cm |
| DATE OF CORE: | 9/88 |
| DESCRIBED BY: | N. Neff |
| LOCATION: | South of Niantic Bay, Long Island Sound |
| LATITUDE: | 41o 16.8' N |
| LONGITUDE: | 72o 09.75' W |
| LORAN: | 26184.9, 43988.9 |
| WATER DEPTH (m): | 17 |
| DATE SPLIT: | 3/89 |
| 0 - 478 cm - | Dark olive gray, 5Y 5/2, firm sandy silt and clay. Scattered sand patches throughout; sand content increases down - section; 5 cm diameter sand patch at 178 cm. Shell fragments at 66 cm, 295 cm, 390 cm; whole, large (6 cm) mercenaria clam and large (3.5 cm) clast at 468 cm (sediment removed from around clam shell and retained in sample bay). Faint mottling at 110 - 150 cm, 180 - 210 cm, 310 - 353 cm; large, diagonal mottled zone at 380 - 390 cm; color gray 5Y 5/1. 165 cm: large (7 cm) "concretion" ( - ); inclusion consists of very hard - packed matrix sediment (silt and clay) and shell fragments. Sharp, irregular lower contact. |
| 478 - 513 cm - | Firm silt and sand. Sand: dark grayish brown, 10YR 3/2; silt: dark olive gray, 5Y 3/2; overall patchy, mottled appearance. Bottom few cm: sand, silt, and 2 - 3 cm clast - size gravel. Contact with overlying unit marked by dark, organic material (or staining of sediment). Organic material persist for 11 cm below contact in an irregular pattern. |