UPPER CAMPANIAN CALCAREOUS NANNOFOSSILS FROM A CORE OF WELL 2-RSS-1, PELOTAS BASIN, BRAZIL

作者：Guerra Rodrigo do Monte^*; Tokutake Lucio Riogi; Fauth Gerson

来源：Revista Brasileira de Paleontologia, 2010, 13(3): 181-188.

DOI：10.4072/rbp.2010.3.03

• calcareous nannofossils
• Pelotas Basin
• biostratigraphy
• Cretaceous
• Campanian

This study aimed to determine calcareous nannofossils associations and their standard biozones, taking into account a previous study for the Cretaceous of the Pelotas Basin conducted by Petroleo Brasileiro S.A. - PETROBRAS. Twenty-three slides from samples of a core from well 2-RSS-1 (depth interval of 4,480.35-4,487.70 m) were analyzed, drilled in the offshore portion of the basin. Thirty-two nannofossil species were recognized, with the most important being Arkhangelskiella cymbiformis, Broinsonia parca constricta, Calculites obscurus, Eiffellithus turriseiffelii, Microrhabdulus decoratus, Micula decussata, Reinhardtites levis, Retecapsa crenulata, Tranolithus orionatus, Uniplanarius sissinghii and Uniplanarius trifidus. The coexistence of the species B. parca constricta and R. levis in the slides indicates the interval between the international biozones CC22b and CC23a. According to the international zonation proposed for the Cretaceous, the interval studied seems to be deposited in the upper Campanian boundary.

• 出版日期2010-12