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Planktonic Foraminiferal Biostratigraphy Across the Eocene–Oligocene Boundary in the North Adriatic Sea

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STRATI 2013

Part of the book series: Springer Geology ((SPRINGERGEOL))

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Abstract

The upper Eocene and lower Oligocene sediments from the wells Istra more-3 and Istra more-4, located on the eastern edge of the Venetian Basin, consist of hemipelagic deposits of marls and silty marls. These sediments contain abundant and very well preserved planktonic foraminiferal assemblages. The standard planktonic foraminiferal zonation of the Palaeogene after Wade et al. (2011) has been applied. The Eocene–Oligocene boundary in the Adriatic Sea is clearly defined by the extinction of all hantkeninids, the Turborotalia cerroazulensis group, and the last globigerinathekid species Globigerinatheka tropicalis, indicating marked climatic deterioration and global cooling. Significant changes in the small size fractions (<125 μm) of sediments across the Eocene–Oligocene boundary are observed. This boundary is also characterized by the abundant occurrence of Chiloguembelina ototara and Tenuitella (T. praegemma and T. gemma) and by the first appearance of the tiny species Cassigerinella chipolensis.

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Correspondence to Vlasta Premec Fucek .

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Fucek, V.P., Kucenjak, M.H. (2014). Planktonic Foraminiferal Biostratigraphy Across the Eocene–Oligocene Boundary in the North Adriatic Sea. In: Rocha, R., Pais, J., Kullberg, J., Finney, S. (eds) STRATI 2013. Springer Geology. Springer, Cham. https://doi.org/10.1007/978-3-319-04364-7_20

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