CALCAREOUS NANNOFOSSILS FROM CRETACEOUS/PALEOGENE BOUNDARY AND EARLIEST DANIAN OF SANTOS BASIN (SÃO PAULO PLATEAU, BRAZIL) – ODP LEG 39-SITE 356-CORES 28/29

Autores/as

  • Maria Dolores Wanderley Universidade Federal do Rio de Janeiro, Instituto de Geociências, Departamento de Geologia
  • Raquel Passeri Aguiar Departamento de Geociências, Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro.

Palabras clave:

Calcareous nannofossils, Cretaceous/Paleogene boundary, Danian, Santos Basin.

Resumen

Qualitative and quantitative analyses of calcareous nannofossils from Cores 28 and 29, Site 356, DSDP/ODP Leg 39, found in 18 m of nannofossil- and foraminiferal-rich calcareous mudstone, in the interval uppermost Maastrichtian and the lowermost Danian provided a continuous record of the Cretaceous/Paleogene boundary. 24 species were identified in the Maastrichtian, and 35 in the lower Danian. The following biozones were recognized: UC20 Zone, Markalius inversus Zone, Cruciplacolithus tenuis Zone, and the Chiasmolithus danicus Zone. Acme events of Thoracosphaera sp. (lowermost Danian) and Praeprinsius dimorphosus (lower Danian) were observed.

Biografía del autor/a

Maria Dolores Wanderley, Universidade Federal do Rio de Janeiro, Instituto de Geociências, Departamento de Geologia

http://lattes.cnpq.br/3268729408165496

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Publicado

2007-07-14

Número

Vol. 25 Núm. 4 (2006)

Sección

Artigos