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The basic composite section in the Barrandian Lower Devonian succession of the beds using magnetic susceptibility stratigraphy
 Koptíková, Leona ; Hladil, Jindřich (advisor) ; Kapička, Aleš (referee) ; VerStraeten, Charles (referee)
The composite reference section in the Lower Devonian succession was established using the magnetic susceptibility (MS) and gamma-ray spectrometric (GRS) logs from 5 sections representing both deep- and shallow-water environment of carbonate slope systems in the Prague Synform. Both background data and data across the boundaries of geological units or event intervals were acquired with the emphasis on obtaining continuous data series. Such a complex, detailed and multidisciplinary data set (petrophysical, lithological, mineralogical and geochemical parameters) has never been collected here. They were linked to the existing biostratigraphical scales and offer complex information for interregional and global correlations now with the precision of a few centimetres, which is a resolution 10 to 100 fold higher than in any established biostratigraphic scale in the Devonian of the Prague Synform. Major changes in the MS, GRS logs and mineralogy concentrate to the proximity of the Lochkovian-Pragian boundary (close to the Lochkov-Praha Fm. boundary). At this level, a reversal point in Th/U ratios is observed (dominant Th concentrations in the Praha Fm. vs. dominant U concentrations in the underlying Lochkov Fm. and overlying Zlíchov Fm. There is a general transgressive trend for the Lochkov and Praha Fm....
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