Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica
作者： G. Villa , David K. Watkins
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摘要: Rare calcareous nannofossils from the Cape Roberts Project drillhole CRP-2A indicate that this area was episodically invaded by marginal oceanic surface waters during late and early Oligocene. These depauperate assemblages lack most of biostratigraphic index fossils for Oligocene, but do provide two datums aid in constraining age section: last appearance datum (LAD) Dictyococcites bisectus (23.9 Ma) at 149.28 mbsf LAD Chiasmolithus altus (26.1 412.25 mbsf. Calcareous nannofossil stratigraphically below c. 440 contain conspicuous evidence reworking older (late Eocene) specimens renders determination difficult.
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