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Geological Society, London, Special Publications; 2004; v. 230; p. 257-273;
DOI: 10.1144/GSL.SP.2004.230.01.13
© 2004 Geological Society of London

Dinoflagellate cyst record of the deep-sea Cretaceous-Tertiary boundary at Uzgrun, Carpathian Mountains, Czech Republic

Przemyslaw Gedl

Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002, Kraków, Poland ndgedl{at}cyf-kr.edu.pl

The record of organic-walled dinoflagellate cysts in deep-sea facies across the Cretaceous-Tertiary boundary is poorly known. A detailed study of uppermost Maastrichtian-lowermost Danian Tethyan deep-sea flysch sediments deposited below the carbonate compensation depth at Uzgrun, in the Czech Republic, has yielded numerous and relatively well-preserved dinoflagellate cysts. Their distribution allows the Cretaceous-Tertiary boundary to be placed within a 73 cm interval, within which an iridium anomaly occurs. Assemblages show no major shifts within the boundary interval, but gradual changes were recorded that possibly relate to sea-level fluctuations and/or nutrient availability. High concentrations of peridinioids appear to indicate upwelling in this part of the Tethys near the Cretaceous-Tertiary boundary. The presence of thermophilic dinoflagellate cysts throughout the section points to a stable, warm-temperate to subtropical climate during the latest Maastrichtian and earliest Danian. Events, such as the Areoligera sp. acme, Manumiella seelandica acme and the Spinidinium sp. acme, known from other Cretaceous-Tertiary boundary sections around the world, were recognized within the studied material.