Coniacian-Santonian Planktic Stratigraphy in central Tunisia |
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| Institution: | 1. Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country UPV/EHU, Ap. 644, 48080 Bilbao, Spain;2. Área de Geología, Geomorfología y Cartografía Geológica, Instituto Geológico y Minero de España (IGME), La Calera 1, Tres Cantos, Madrid, Spain;3. C/ Mayor 30, 1°, Jaca, Huesca, Spain |
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| Abstract: | 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 asymetrica. It also lies ～4–7 m below the LO of the inoceramid Platyceramus cycloides and the ammonite Texanites (Texanites) sp. Comparing these marker C/S bioevents with the global stratotype section, the Olazagutia section (Spain) shows that the stratigraphic range of the bioevents are variable. This observation must be taken into consideration when making regional chronostratigraphic correlations. |
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| Keywords: | Coniacian-Santonian Calcareous nannofossils Planktic foraminifera Bioevents Tunisia |
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