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An integrated multi-proxy study of cyclic pelagic deposits from the north-western Tethys: The Campanian of the Postalm section (Gosau Group, Austria)

Katharina Böhm; Benjamin Sames; Christoph Spötl; Johann Hohenegger; J. Dinarès Turell; Michael Wagreich; Erik Wolfgring; Erik Wolfgring; S. Jin; Susanne Gier


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    <subfield code="a">&lt;p&gt;The Upper Cretaceous Postalm section in the Northern Calcareous Alps (Austria) exposes pelagic deposits of the northwestern Tethys whose cyclostratigraphy and palaeoenvironments were examined in this study. The section displays rhythmic deposits of Santonian to late Campanian age (Gosau Group). The Santonian/Campanian transition is characterised by condensed greyish carbonates, while the younger deposits are composed of reddish foraminiferal packstones displaying distinct limestone-marl alternations. A biostratigraphic framework based on planktonic foraminifera and calcareous nannofossils is supported by carbon and strontium isotope stratigraphy as well as magnetostratigraphy. The carbon isotope data allow to correlate the Postalm section to other Tethyan reference sites and to identify δ&lt;sup&gt;13&lt;/sup&gt;C events, such as the Late Campanian Event. Spectral analyses of three independently assessed proxies (δ&lt;sup&gt;13&lt;/sup&gt;C, Fe content and the thickness of limestone/marl couplets) in the upper, continuously exposed section part identified 17 to 18 405 ka cycles spanning the mid to upper Campanian (Contusotruncana plummerae to Gansserina gansseri Zones or CC21/UC15c to CC23a/UC16 nannofossil zones).&lt;/p&gt;</subfield>
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