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标题：Late Maastrichtian foraminiferids and diatoms from the Polish Carpathians (Ropianka Formation, Skole Nappe): a case study from the Chmielnik-Grabówka composite section
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作者：M. Adam Gasiński ; Alexandra Olshtynska ; Alfred Uchman 等
期刊名称：Acta geologica Polonica
印刷版ISSN：0001-5709
出版年度：2013
卷号：63
期号：4
页码：515-525
语种：English
出版社：Institute of Geology, University of Warsaw
摘要：Well-preserved foraminiferids have been found in the Chmielnik-Grabówka section (Skole Nappe, Polish Carpathians). The Abathomphalus mayaroensis (late Maastrichtian) and Racemiguembelina fructicosa (early late Maastrichtian) standard planktonic foraminiferal biozones have been recognized, based on the occurrence of their respective index species. Sediments of the R. fructicosa Zone contain diatoms, which are a rare component of Cretaceous flysch microfossil assemblages in the Carpathians. The diatom frustules and some foraminiferid tests are pyritized, probably after burial in the sediment, below the redox boundary or inthe oxygen-deficient microenvironment inside the frustules or tests of microfossils; the presence of trace fossils and bioturbational structures in the same bed indicate an oxygenated sea floor.
关键词：Carpathians;Skole Nappe;Cretaceous;Microfossils;Plankton;Foraminiferids;Diatoms;Flysch