Table 1. Lithological description of samples, Sites 999 and 1001.
| Core, section, interval (cm) |
Depth (mbsf) |
Shipboard description of section | Thin-section description | |
|---|---|---|---|---|
Age
|
Lithology
|
|||
| 165-999A- | ||||
| 2H-2, 144-150 | 10.54 | Pleistocene | Nannofossil clayey mixed sediment with foraminifers alternating on a dm scale with foraminiferal clayey mixed sediment; structureless overall, slight to moderate bioturbation. | Packstone-wackestone with intraparticle porosity in microfossils. |
| 13H-1, 144-150 | 113.54 | Pliocene | Nannofossil clayey mixed sediment with foraminifers alternating on a dm scale with foraminiferal clayey mixed sediment with nannofossils; homogeneous, massive, slightly to heavily bioturbated. | Bioclast-rich laminated wackestone-packstone. Single microfossils have intraparticle porosity. |
| 35X-5, 144-150 | 323.44 | middle Miocene | Nannofossil clayey mixed sediment with radiolarians; homogeneous, massive, moderately to heavily bioturbated. | Mudstone with single microfossils containing intraparticle porosity. |
| 45X-4, 50-57 | 417.10 | early-middle Miocene | Clayey nannofossil chalk with foraminifers, homogeneous, massive, slightly to heavily bioturbated. | Wackestone-packstone. The frequent microfossils have intraparticle porosity. |
| 61X-1, 78-84 | 557.28 | early Miocene | Clayey calcareous chalk with nannofossils and foraminifers; homogeneous, massive, and moderately bioturbated. | Wackestone. The microfossils are partly cemented, partly containing intraparticle porosity. |
| 165-1001B- | ||||
| 1R-2, 0-6 | 26.80 | Pleistocene | Nannofossil, clayey mixed sediment with foraminifers; massive, moderately bioturbated, with foraminifers concentrated within burrows. | Packstone with intraparticle porosity in microfossils. |
| 2R-2, 0-6 | 151.80 | middle Miocene | Nannofossil ooze with clay; massive and moderately bioturbated. | Laminated mudstone-wackestone with single shell fragments. No visible intraparticle porosity. |
| 3R-1, 30-36 | 206.80 | early Eocene | Calcareous chalk with clay. The sediment is massive and moderately bioturbated | Wackestone with single microfossils containing intraparticle porosity. |
| 13R-2, 75-81 | 304.85 | late Paleocene | Calcareous chalk with clay; massive, well indurated, moderately bioturbated, and contains burrows flattened by compaction, producing wispy lamination. Coarse-grained foraminifer- and radiolarian-rich intervals present throughout the core. The boundaries of these layers range from transitional to sharp and uneven. | Packstone with microfossils containing intraparticle porosity. |
| 23R-5, 13-19 | 395.33 | Maastrichtian | Calcareous limestone with clay; massive, well indurated, moderately bioturbated, and contains burrows flattened by compaction, producing wispy lamination. There are numerous clay-rich, darker green layers, that are 1-2 cm and have gradational contacts. | Packstone with partly cemented microfossils. Some contain intraparticle porosity. |
| 165-1001A- | ||||
| 50R-1, 104-110 | 459.44 | Campanian | Calcareous limestone with clay; moderately bioturbated, slightly darker wispy laminated, clay-rich intervals present throughout. Rare foraminifer- and radiolarian-rich sandy horizons with sharp, but nonerosive, boundaries. | Cemented packstone with single intraparticle porosity containing microfossils. |
Notes: Shipboard description of section (Sigurdsson, Leckie, Acton, et al., 1997).Thin-section description (Dunham, 1962; Choquette and Pray, 1970).