Calcareous nannofossils and the Santonian/Campanian and Campanian/Maastrichtian boundaries on the Brazilian Continental Margin: historical overview and state of the art

Published on Dec 1, 1997in Cretaceous Research2.12
· DOI :10.1006/cres.1997.0089
Armando Antonio Scarparo Cunha3
Estimated H-index: 3
Rogerio Loureiro Antunes2
Estimated H-index: 2
J. A. Burnett12
Estimated H-index: 12
(UCL: University College London)
Abstract Recognition of the Campanian stage on the Brazilian Continental Margin, using calcareous nannofossils, has been historically problematic. This paper constitutes an overview of earlier works, showing how nannofossil biostratigraphic ideas have evolved since Troelsen & Quadros provided the first biozonation of this region in 1971. Recent studied have provided data which have helped to clarify these apparent biostratigraphic problems, and allows this region to be placed in a global biostratigraphic context. The earliest researchers identified the Santonian/Campanian boundary by the last occurrences of ‘ Lithastrinus grillii ’ and Petrobrasiella venata. P. venata was later abandoned as an index species due to its rarity and, instead, the last occurrences of Marthasterites furcatus and ‘ Lithastrinus grillii ’ became the most-used markers. However, the stratigraphic age of these biohorizons diverged from those quoted in the literature. In the Brazilian basins, these extinctions, rather than having occurred in the Campanian as was recorded elsewhere, were considered to mark the top of the Santonian, as suggested by correlations with other microfossil groups (primarily foraminifera and palynomorphs). To explain this phenomenon, the existence of a condensed sequence was postulated for most of the Brazilian marginal basins, where the uppermost Santonian deposits were apparently indistinguishable from those of the lowermost Campanian. In line with current correlations presented in the nannofossil literature, and with new information obtained from core and side-wall samples, it is now believed that the extinction of these species did occur in the Campanian in the Brazilian basins, whilst the last occurrence of Lithastrinus moratus (previously misidentified as Lithastrinus grillii ) has become a useful Santonian marker. Thus the Santonian/Campanian boundary in Brazil lies in a stratigraphic position similar to elsewhere in nannofossil terms, that is below CC18. The Campanian/Maastrichtian boundary was initially characterised in nannofossil terms in Brazil by the last occurrence of Broinsonia parca constricta , and later by the last occurrence of Eiffellithus eximius . Recently acquired data has shown that the sequence of events in the Brazilian marginal basins is similar to that of the Sissingh/Perch-Nielsen standard biozonation scheme through this interval. Again, correlations in the literature with the recently defined boundary (in macrofossil terms) thus allow the boundary to be determined between the last occurrences of Broinsonia parca constricta and Uniplanarius trifidus , that is, in CC23b.
  • References (0)
  • Citations (6)
📖 Papers frequently viewed together
6 Citations
8 Citations
255 Citations
78% of Scinapse members use related papers. After signing in, all features are FREE.
Cited By6
#1Sherif Farouk (EPRI: Egyptian Petroleum Research Institute)H-Index: 10
#2Mahmoud Faris (Tanta University)H-Index: 9
Last. Michael Wagreich (University of Vienna)H-Index: 8
view all 5 authors...
Abstract Calcareous nannofossil and planktonic foraminifera biostratigraphic datums are correlated with carbon isotope stratigraphy across the upper Santonian–lower Campanian transition from Ain Zouakra outcrop (Elles area) in north-western Tunisia. Twenty two calcareous microplankton bio-events are identified and discussed, including 11 planktonic foraminiferal and 11 nannofossil events. The studied upper Santonian–lower Campanian succession can be divided into five nannofossil zones (CC17/UC13...
3 CitationsSource
#1Sherif Farouk (EPRI: Egyptian Petroleum Research Institute)H-Index: 10
#2Mahmoud Faris (Tanta University)H-Index: 9
Last. Zaineb Elamri (University of Kairouan)H-Index: 4
view all 3 authors...
In this study, we describe a new stratigraphy of three exposed sections in central Tunisia, integrating Coniacian and Santonian planktic foraminifera and calcareous nannoplankton, supported by ammonite and inoceramid bioevents. In the three sections, the Coniacian/Santonian (C/S) boundary lies slightly above the lowest occurrence (LO) of the calcareous nannofossil Lucianorhabdus cayeuxii, which marks nannofossil Zone CC16 and matches well with the LO of the planktic foraminifera Dicarinella asym...
4 CitationsSource
The lithology, sedimentology and biostratigraphy of the Bozes Formation, which crop out in the SE Metaliferi Mountains (Apuseni Mts.) have been investigated in order to establish the age of the deposits and the depositional environment. The sedimentary structures and facies are interpreted as indicating a deep-water depositional environment, representing part of a submarine fan lobe. Three facies assemblages have been identified and described. Calcareous nannofossils were used to determine the a...
6 CitationsSource
#1Claudia G. CeteanH-Index: 5
#2Ramona BălcH-Index: 4
Last. Sorin FilipescuH-Index: 12
view all 4 authors...
Study of an upper Santonian to upper Campanian hemipelagic succession from the southern part of the Romanian Eastern Carpathians enables us to establish an integrated biostratigraphy based on planktonic foraminifera and calcareous nannofossils and to compare this record with the agglutinated foraminiferal biozonation used for the Carpathians.Benthic foraminiferal assemblages were investigated using several methods, such as agglutinated and calcareous benthic foraminiferal morphogroups, and the b...
38 CitationsSource
#1Michael Wagreich (University of Vienna)H-Index: 24
Last. Andreas KrohH-Index: 22
view all 3 authors...
Abstract The Schattau section in the Gosau Group (Northern Calcareous Alps) records a late Santonian interval in the northwestern Tethys. The crinoid Marsupites laevigatus, which indicates the lower part of the latest Santonian Marsupites zone, has been found within a Micraster bed in the Bibereck Formation. Co-occurring ammonites, such as Boehmoceras arculus and Placenticeras maherndli, indicate a late Santonian age. The upper Santonian zonal markers Placenticeras paraplanum and Cordiceramus mu...
13 CitationsSource
#1Michael WagreichH-Index: 24
#2T. KüchlerH-Index: 2
Last. Herbert SummesbergerH-Index: 8
view all 3 authors...
10 CitationsSource