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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2001
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| Online Access: | https://doi.org/10.1594/PANGAEA.484682 |
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| _version_ | 1867171622341836800 |
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| author | Watkins, David K Wise, Sherwood W Villa, Giuliana |
| author_facet | Watkins, David K Wise, Sherwood W Villa, Giuliana |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Fossil specimens of the exclusively oceanic calcareous nannoplankton were found only in the upper 200 m of the Cape Roberts Project 3 (CRP-3) cores. These assemblages are depauperate and sporadic in occurrence. The majority of the assemblages contain fewer than 4 species, indicating a severe palaeoecological restriction. The clear domination of these assemblages by reticulofenestrid species, coupled with the almost total exclusion of Coccolithus pelagicus, indicates cold surface water conditions in the Victoria Land Basin during the lives of these poor algae. These cold surface water conditions, perhaps coupled with abnormal surface water chemistry, excluded almost all of the age-diagnostic species from the area. The occurrence of Transversopontis pulcheroides, however, suggests a biostratigraphic assignment of lower Oligocene for this part of the core. The CRP-3 assemblages occur within fine-grained clastic sedimentary rocks, but only those that are in close stratigraphical proximity with coarser-grained lithologies. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_484682 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Range chart of calcareous nannofossils in samples of sediment core CRP-3 Watkins, David K Wise, Sherwood W Villa, Giuliana Abundance estimate; Braarudosphaera bigelowii; Cape Roberts Project; Chiasmolithus altus; Chiasmolithus oamaruensis; Coccolithus pelagicus; Coccosphaera pachyderma; Core wireline system; Counting; CRP; CRP-3; CRP-3__Campaign; CWS; DEPTH, sediment/rock; Dictyococcites bisectus; Dictyococcites daviesii; Dictyococcites hesslandii; Dictyococcites productus; Dictyococcites scrippsae; Nannofossil abundance; Nannofossils preservation; Number of species; Reticulofenestra hampdenensis; Ross Sea; Sampling/drilling from ice; Specimen count; Thoracosphaera sp. cf. T. heimii; Thoracosphaera sp. cf. T. saxea; Transversopontis pulcheroides Fossil specimens of the exclusively oceanic calcareous nannoplankton were found only in the upper 200 m of the Cape Roberts Project 3 (CRP-3) cores. These assemblages are depauperate and sporadic in occurrence. The majority of the assemblages contain fewer than 4 species, indicating a severe palaeoecological restriction. The clear domination of these assemblages by reticulofenestrid species, coupled with the almost total exclusion of Coccolithus pelagicus, indicates cold surface water conditions in the Victoria Land Basin during the lives of these poor algae. These cold surface water conditions, perhaps coupled with abnormal surface water chemistry, excluded almost all of the age-diagnostic species from the area. The occurrence of Transversopontis pulcheroides, however, suggests a biostratigraphic assignment of lower Oligocene for this part of the core. The CRP-3 assemblages occur within fine-grained clastic sedimentary rocks, but only those that are in close stratigraphical proximity with coarser-grained lithologies. |
| title | (Table 1) Range chart of calcareous nannofossils in samples of sediment core CRP-3 |
| topic | Abundance estimate; Braarudosphaera bigelowii; Cape Roberts Project; Chiasmolithus altus; Chiasmolithus oamaruensis; Coccolithus pelagicus; Coccosphaera pachyderma; Core wireline system; Counting; CRP; CRP-3; CRP-3__Campaign; CWS; DEPTH, sediment/rock; Dictyococcites bisectus; Dictyococcites daviesii; Dictyococcites hesslandii; Dictyococcites productus; Dictyococcites scrippsae; Nannofossil abundance; Nannofossils preservation; Number of species; Reticulofenestra hampdenensis; Ross Sea; Sampling/drilling from ice; Specimen count; Thoracosphaera sp. cf. T. heimii; Thoracosphaera sp. cf. T. saxea; Transversopontis pulcheroides |
| url | https://doi.org/10.1594/PANGAEA.484682 |