The position of the Rupelian/Chattian boundary in the southern Upper Rhine Graben based on new records of microfossils |
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Authors: | Claudius Pirkenseer Jean-Pierre Berger? Bettina Reichenbacher |
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Institution: | 1. Unit Earth Sciences, Université de Fribourg, Chemin du Musée 6, 1700, Fribourg, Switzerland 2. Department for Earth and Environmental Sciences, Pal?ontologie und Geobiologie, Ludwig-Maximilians-Universit?t, Richard-Wagner-Str. 10, 80333, Munich, Germany
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Abstract: | This study analyses the regressive phase of the marine Froidefontaine Subgroup and the subsequent fluvio-lacustrine Niederroedern formation in the southern Upper Rhine Graben during the Late Rupelian and the position of the Rupelian/Chattian boundary. The study is based on the sedimentary record and several microfossil groups from two boreholes, with a focus on new records of fish otoliths, Bolboforma and Charophyta. The biostratigraphic evaluation of these groups provides evidence for a position of the Rupelian/Chattian boundary within the upper Niederroedern Formation. This is contrary to the results from a previous sedimentological approach, which places the boundary at the base of the Niederroedern Formation. The fish fauna indicates a biogeographic relation to southern France, the Molasse Basin of Switzerland and southern Germany. |
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