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Watkins, David K; Villa, Giuliana (2000): Range chart of calcareous nannofossils in sediment core CRP-2A (Table 1). PANGAEA,, 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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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.
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
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 * 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)
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)
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Nannofossil abundanceNannos abundWatkins, David KAbundance estimateB = 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)
3Nannofossils preservationNannos preservWatkins, David KAbundance estimateP = 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)
4Bicolumnus ovatusB. ovatusWatkins, David KAbundance estimate
5Chiasmolithus altusC. altusWatkins, David KAbundance estimate
6Dictyococcites bisectusD. bisectusWatkins, David KAbundance estimate
7Dictyococites daviesiiD. daviesiiWatkins, David KAbundance estimate
8Dictyococites hesslandiiD. hesslandiiWatkins, David KAbundance estimate
9Dictyococites productusD. productusWatkins, David KAbundance estimate
10Isthmolithus recurvusI. recurvusWatkins, David KAbundance estimate
11Reticulofenestra hampdenensisR. hampdenensisWatkins, David KAbundance estimate
12Reticulofenestra minutaR. minutaWatkins, David KAbundance estimate
13Reticulofenestra minutulaR. minutulaWatkins, David KAbundance estimate
14Reticulofenestra oamaruensisR. oamaruensisWatkins, David KAbundance estimate
15Reticulofenestra umbilicusR. umbilicusWatkins, David KAbundance estimate
16Sphenolithus sp.Sphenolithus sp.Watkins, David KAbundance estimatecf. S. moriformis
17Thoracosphaera sp.Thoracosphaera sp.Watkins, David KAbundance estimate
18Thoracosphaera heimiiT. heimiiWatkins, David KAbundance estimate
19Thoracosphaera saxeaT. saxeaWatkins, David KAbundance estimate
20Nannofossils indeterminataNannos indetWatkins, David KAbundance estimatesp. A
21Triquetrorhabdulus sp.Triquetrorhabdulus sp.Watkins, David KAbundance estimate
22Species richnessSWatkins, David KAbundance estimate
625 data points

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