Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica
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, b...
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ftunivnebraskali:oai:digitalcommons.unl.edu:geosciencefacpub-1168 2023-11-12T04:04:12+01:00 Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica Watkins, David K. Villa, G. 2000-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/geosciencefacpub/167 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1168/viewcontent/Watkins_TA_2000_Palaeogene_calcareous.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/geosciencefacpub/167 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1168/viewcontent/Watkins_TA_2000_Palaeogene_calcareous.pdf Papers in the Earth and Atmospheric Sciences Earth Sciences text 2000 ftunivnebraskali 2023-10-30T10:44:25Z 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 datums 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. Text Antarc* Antarctica Victoria Land University of Nebraska-Lincoln: DigitalCommons@UNL Victoria Land Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) |
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Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Watkins, David K. Villa, G. Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica |
topic_facet |
Earth Sciences |
description |
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 datums 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. |
format |
Text |
author |
Watkins, David K. Villa, G. |
author_facet |
Watkins, David K. Villa, G. |
author_sort |
Watkins, David K. |
title |
Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica |
title_short |
Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica |
title_full |
Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica |
title_fullStr |
Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica |
title_full_unstemmed |
Palaeogene Calcareous Nannofossils from CRP-2/2A, Victoria Land Basin, Antarctica |
title_sort |
palaeogene calcareous nannofossils from crp-2/2a, victoria land basin, antarctica |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2000 |
url |
https://digitalcommons.unl.edu/geosciencefacpub/167 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1168/viewcontent/Watkins_TA_2000_Palaeogene_calcareous.pdf |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) |
geographic |
Victoria Land Cape Roberts |
geographic_facet |
Victoria Land Cape Roberts |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_source |
Papers in the Earth and Atmospheric Sciences |
op_relation |
https://digitalcommons.unl.edu/geosciencefacpub/167 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1168/viewcontent/Watkins_TA_2000_Palaeogene_calcareous.pdf |
_version_ |
1782341035919147008 |