Abstract
A multidisciplinary study of the Devonian–Carboniferous boundary interval in pelagic successions of the Holy Cross Mountains and Sudetes and the ramp successions in the Western Pomerania region (Poland) is presented herein. The analysis applies the results of new palaeontological and biostratigraphic studies based mainly on conodonts, ammonoids and palynomorphs, biostratigraphic results interpreted earlier by different authors that have been re-examined, and geochemical and mineralogical characteristics, as well as magnetic susceptibility measurements across the Devonian–Carboniferous boundary interval. The study is focused on the interval from the Famennian ultimus conodont Zone to the Tournaisian duplicata conodont Zone, and from the Famennian lepidophyta–explanatus (LE) miospore Zone to the Tournaisian verrucosus–incohatus (VI) miospore Zone, respectively. The paper highlights sections, which are the most representative for the Devonian–Carboniferous boundary in each region, illustrates and summarises current knowledge on the uppermost Famennian to lowermost Tournaisian in these regions, gives data and correlation of the important stratigraphic markers for each region, and briefly correlates them outside the region. The sedimentary successions and specific phenomena, together with microscale environmental perturbations, recognised close to the Devonian/Carboniferous boundary in Poland, display a pattern similar to that observed in many areas in Europe during the Hangenberg Event.
Highlights
Previous and recent studies across the Devonian– Carboniferous boundary (DCB) interval have demonstrated several problems with its determination, resulting from the quality of the collected material and the species concept of individual researchers for the definition of this boundary (e.g. Kaiser et al 2009; Becker et al 2016; Corradini et al 2017; Spalletta et al 2017; Kaiser et al 2019)
& The undoubted last occurrence of typical pre-Hangenberg conodont taxa at the base of the Hangenberg Black Shale (HBS) horizon in both pelagic sections or its equivalents in the ramp succession could define the base of the costatus–kockeli Interregnum (c–kI) sensu Kaiser et al (2009) and Becker et al (2016)
& Siphonodella sulcata M5 and Polygnathus purus subplanus characterise the beginning of the Tournaisian sulcata/kuehni conodont Zone in pelagic Kowala sections; the lowermost dated part of the Tournaisian succession in the Western Pomerania area is probably the duplicata conodont Zone
Summary
Previous and recent studies across the Devonian– Carboniferous boundary (DCB) interval have demonstrated several problems with its determination, resulting from the quality of the collected material and the species concept of individual researchers for the definition of this boundary (e.g. Kaiser et al 2009; Becker et al 2016; Corradini et al 2017; Spalletta et al 2017; Kaiser et al 2019). Kaiser et al 2009; Becker et al 2016; Corradini et al 2017; Spalletta et al 2017; Kaiser et al 2019) It seems, This article is a contribution to the special issue “Global review of the Devonian-Carboniferous Boundary”. The goal of this study is to provide a detailed documentation of important stratigraphic markers across the DCB interval for different regions of Poland, as a contribution to the ongoing international revision of the DCB. The several-hundred-kilometres-wide shelf area was located in the Devonian in the Polish part of a pericratonic basin, which stretched from Western Europe to the Ukraine along the periphery of Laurussia (Old Red Sandstone Continent). Supplementary and comparative data were derived from neritic sections, where the uppermost Famennian ramp sequence was documented in the Western Pomerania area in the Gorzysław-9, Rzeczenica-1
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