Time filter

Source Type

São Leopoldo, Brazil

Do Monte Guerra R.,Laboratorio Of Micropaleontologia | Tokutake L.R.,Ferrari | Fauth G.,Laboratorio Of Micropaleontologia
Revista Brasileira de Paleontologia | Year: 2010

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 Petróleo 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. © 2010 by the Sociedade Brasileira de Paleontologia.

Ferreira F.,Laboratorio Of Micropaleontologia | Leipnitz I.I.,Laboratorio Of Micropaleontologia | Vicalvi M.A.,Petrobras | Sanjines A.E.S.,Petrobras
Revista Brasileira de Paleontologia | Year: 2012

The climatic zones based on planktonic foraminifera recovered from two piston cores collected on the slope of the Santos Basin, has shown the record of climate oscillations over the last ~620 ka. Seven zones and 14 subzones were recognized, represented by glacial (zones U, W and Y; subzones U2, U1, W2, W1, Y2, Y1B, Y1A) and interglacial intervals (zones T, V and X; subzones V3, V2B, V2A, V1, X1 to X3) of Pleistocene and the Holocene (zone Z). The Pulleniatina plexus allowed the division of subzone V2 in two (V2B and V2A) and provided eight regional correlation horizons along the subzones V3 and V2. The coiling direction of Globorotalia truncatulinoides helped the recognition of boundaries between subzones U2/U1, V2B/V2A, X3/X2 and X2/X1, showing as a useful tool for the refinement of the zones and subzones of the Quaternary. The permanent presence of suggests a constant influence of cold and productive waters over the past ~620 ka, especially in the southern part of the study area. © 2012 by the Sociedade Brasileira de Paleontologia.

Bergue C.T.,Laboratorio Of Micropaleontologia | Fauth G.,Laboratorio Of Micropaleontologia | Vieira C.E.L.,Laboratorio Of Micropaleontologia | dos Santos A.S.,Laboratorio Of Micropaleontologia | Viviers M.C.,Petrobras
Revista Brasileira de Paleontologia | Year: 2011

Eleven wells (1,765 cutting samples) from the Senonian of Santos Basin were examined, with the record of both marine and mixohaline ostracode faunas. The latter are composed mainly by Fossocytheridea and characterized by medium specific richness and high abundance. Four new species are here described: F. posterodentata, F. ventrotuberculata, F. santosensis and F. anfisulcata and another one is left in open nomenclature. Besides the conspicuous variability, F. ventrotuberculata sp. nov. is the first species described for the genus with valve reversal. The significance of these new species described and their potential for applied approaches are discussed. © 2011 by the Sociedade Brasileira de Paleontologia.

Piovesan E.K.,Laboratorio Of Micropaleontologia | Bergue C.T.,Laboratorio Of Micropaleontologia | Fauth G.,Laboratorio Of Micropaleontologia
Revista Brasileira de Paleontologia | Year: 2010

Two new species of Cretaceous ostracodes from the Santos Basin are proposed here: Afrocytheridea? cretacea sp. nov. and Pelecocythere dinglei sp. nov. The first one possibly constitutes the youngest record of Afrocytheridea, a typical Jurassic genus, while the latter the eldest of Pelecocythere. Both genera are typical elements of Gondwanide ostracode faunas and are recorded for the first time in Brazil. The paleoecologic and paleogeographic aspects of these two new species are discussed based on other published occurrences of Pelecocythere and Afrocytheridea. © 2010 by the Sociedade Brasileira de Paleontologia.

Discover hidden collaborations