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