Biostratigraphy of the lower red shale interval in the Rhenodanubian Flysch Zone of Austria |
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Authors: | Michael Wagreich Polina Pavlishina Ewa Malata |
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Institution: | aDepartment of Geological Sciences, University of Vienna, Althanstraße 14, A-1090 Vienna, Austria;bDepartment of Geology and Palaeontology, Sofia University, 15 Tzar Osvoboditel Bd., 1000 Sofia, Bulgaria;cInstitute of Geological Sciences, Jagiellonian University, Oleandry 2a, Kraków, Poland |
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Abstract: | In the Rhenodanubian Flysch Zone of Austria, between the Aptian–Albian “Gault Flysch” and the Cenomanian–Turonian Reiselsberg Formation, an interval with predominant red shales (“Untere Bunte Schiefer”) occurs. In the Oberaschau section near Attersee (Upper Austria) a ca. 18-m-thick interval of alternating red and grey shales and marlstones with minor sandstones is present. Thin sandstone intercalations are interpreted as distal turbidites. Dinoflagellate cyst assemblages indicate the Litosphaeridium siphoniphorum Zone. The concurrent presence of Litosphaeridium siphoniphorum and Ovoidinium verrucosum in all samples allows a correlation to the lower part of this zone, thus defining a Late Albian–Early Cenomanian age. Based on foraminifera, the red beds can be assigned to the topmost Rotalipora appenninica Zone and the Rotalipora globotruncanoides Zone due to the presence of small morphotypes of the index taxa. Nannofossils indicate standard zones CC9/UC0 throughout the red interval, defined by the first occurrence of Eiffellithus turriseiffelii, and UC1 above the red shales. Based on these multistratigraphic data, a latest Albian–Early Cenomanian age can be inferred. |
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Keywords: | Rhenodanubian Flysch Zone Albian Cenomanian Dinoflagellates Foraminifera Nannofossils |
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