Watkins, David K; Villa, Giuliana (2000): Range chart of calcareous nannofossils in sediment core CRP-2A (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.144690, Supplement to: Watkins, DK; Villa, G (2000): Palaeogene calcareous nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(4), 443-452, hdl:10013/epic.28262.d001
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Abstract:
Rare calcareous nannofossils from the Cape Roberts Project drillhole CRP-2A indicate that this area was episodically invaded by marginal oceanic surface waters during the late and late early Oligocene. These depauperate assemblages lack most of the biostratigraphic index fossils for the Oligocene, but do provide two datum that aid in constraining the age of the section: the last appearance datum (LAD) of Dictyococcites bisectus (23.9 Ma) at 149.28 mbsf and the LAD of Chiasmolithus altus (26.1 Ma) at 412.25 mbsf. Calcareous nannofossil assemblages stratigraphically below c. 440 mbsf contain conspicuous evidence of reworking of older (late Eocene) specimens that renders age determination difficult.
Project(s):
Cape Roberts Project (CRP)
Coverage:
Latitude: -77.005980 * Longitude: 163.719450
Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00
Minimum DEPTH, sediment/rock: 47.54 m * Maximum DEPTH, sediment/rock: 624.10 m
Event(s):
CRP-2A (14.2 km at 096° true from Cape Roberts) * Latitude: -77.005980 * Longitude: 163.719450 * Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00 * Elevation: -177.9 m * Recovery: 624 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-2 * Basis: Sampling/drilling from ice * Method/Device: Core wireline system (CWS) * Comment: 921 m at 284° from CRP-1. Sea-ice thickness: 2.0 m (1 Oct) to 2.2 m (23 Nov). Sea riser embedded to 13.03 mbsf. Lateral ice movement: 9.87 m to east from 17 Oct to 23 Nov. HQ core to 199.31 mbsf. NQ core to 624.15 mbsf. 13.03 to 45.97 mbsf, 11.29 m (34%) partially following CRP-2. 45.07 to 624.15 mbsf, 548.67 m (95%) new hole. Deepest core-lithology: hard sandy siltstone. Deepest core-age: earliest Oligocene (ca. 33 Ma on diatoms, nannofossils and dinoflagellates)
Comment:
The abundance of individual species is expressed by the following letters:R = rare (<5 sp. per traverse), F = few (6-10 sp. per traverse), C = common (>11 sp. per traverse)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Nannofossil abundance | Nannos abund | Watkins, David K | Abundance estimate | B = barren, VR = very rare (1-2 specimens per longitudinal traverse of the 40 mm smear slide), R = rare (3-10 specimens per traverse) and F = few (10-100 specimens per traverse) | |
| 3 | Nannofossils preservation | Nannos preserv | Watkins, David K | Abundance estimate | P = poor (severely dissolved so that species identif. is frequently impaired), M = moderate (species identif. only occasionally impaired by diagenis) and G = good (mild or no diagenesisn species identif. not impaired) | |
| 4 | Bicolumnus ovatus | B. ovatus | Watkins, David K | Abundance estimate | ||
| 5 | Chiasmolithus altus | C. altus | Watkins, David K | Abundance estimate | ||
| 6 | Dictyococcites bisectus | D. bisectus | Watkins, David K | Abundance estimate | ||
| 7 | Dictyococites daviesii | D. daviesii | Watkins, David K | Abundance estimate | ||
| 8 | Dictyococites hesslandii | D. hesslandii | Watkins, David K | Abundance estimate | ||
| 9 | Dictyococites productus | D. productus | Watkins, David K | Abundance estimate | ||
| 10 | Isthmolithus recurvus | I. recurvus | Watkins, David K | Abundance estimate | ||
| 11 | Reticulofenestra hampdenensis | R. hampdenensis | Watkins, David K | Abundance estimate | ||
| 12 | Reticulofenestra minuta | R. minuta | Watkins, David K | Abundance estimate | ||
| 13 | Reticulofenestra minutula | R. minutula | Watkins, David K | Abundance estimate | ||
| 14 | Reticulofenestra oamaruensis | R. oamaruensis | Watkins, David K | Abundance estimate | ||
| 15 | Reticulofenestra umbilicus | R. umbilicus | Watkins, David K | Abundance estimate | ||
| 16 | Sphenolithus sp. | Sphenolithus sp. | Watkins, David K | Abundance estimate | cf. S. moriformis | |
| 17 | Thoracosphaera sp. | Thoracosphaera sp. | Watkins, David K | Abundance estimate | ||
| 18 | Thoracosphaera heimii | T. heimii | Watkins, David K | Abundance estimate | ||
| 19 | Thoracosphaera saxea | T. saxea | Watkins, David K | Abundance estimate | ||
| 20 | Nannofossils indeterminata | Nannos indet | Watkins, David K | Abundance estimate | sp. A | |
| 21 | Triquetrorhabdulus sp. | Triquetrorhabdulus sp. | Watkins, David K | Abundance estimate | ||
| 22 | Species richness | S | Watkins, David K | Abundance estimate |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
625 data points