Der Keuper in der Stratigraphischen Tabelle von Deutschland 2016: kontinuierliche oder lückenhafte Überlieferung?
The Keuper Group in the Stratigraphic Table of Germany 2016: a continuous or discontinuous stratigraphic record?
Abstract: In the Stratigraphic Table of Germany 2016, the Keuper Group is represented by two alternative interpretations. Model A is based on an estimate of the relative proportions of accumulation and stasis throughout the basin, derived from a combination of the biostratigraphic, cyclostratigraphic and sedimentological data. Model B assumes almost continuous sedimentation in the central parts of the basin, discussed by Franz et al. 2017 (this volume). Both interpretations are based on the same biostratigraphic data from palynomorphs, tetrapods, mollusks and conchostracans. However, the correlation between these schemes with the global timescale remains ambiguous and the numerical ages of the global stage boundaries are still uncertain. Very low accumulation rates only seem plausible for the Late Carnian sediments from a sedimentological point of view, whereas the Norian deposits seem to have accumulated more rapidly in several short intervals. Even if the "Long Tuvalian Option" of GTS 2012 is used, it does not seem likely that they represent all of the Norian time. Basin-wide palaeosols and corresponding unconformities at uplifts and basin margins represent significant stasis and erosion surfaces and probably hiatuses not resolved by biostratigraphy.
Keywords: BIOSTRATIGRAPHIE; BIOSTRATIGRAPHY; CHRONOSTRATIGRAPHIE; CHRONOSTRATIGRAPHY; CYCLOSTRATIGRAPHY; KEUPER; LITHOSTRATIGRAPHIE; LITHOSTRATIGRAPHY; STD 2016; STRATIGRAPHIC COMPLETENESS; STRATIGRAPHISCHE VOLLSTÄNDIGKEIT; TRIAS; TRIASSIC; ZYKLOSTRATIGRAPHIE
Document Type: Research Article
Publication date: June 1, 2018
- Zeitschrift der Deutschen Gesellschaft für Geowissenschaften (ZDGG) is an international peer reviewed journal that accepts papers on research and applied topics in the Earth Sciences. It is published online and in print. One volume, consisting of four issues is published annually. The journal is continously published by the German Geological Society since its foundation in 1848. It was relaunched in 2005.
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