Early Emsian of the Pod Barrandovem section – biostratigraphy, paleoenvironmental proxies, and correlation of the Bohemian Graptolite Event (Prague Synform, Czech Republic)
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The Pod Barrandovem section was subjected to multiproxy studies, including biostratigraphy, sedimentology, gamma-ray spectrometry, magnetic susceptibility, multi-element geochemistry (INAA, EDXRF), and stable isotopes (δ¹⁸O, δ¹³C). The section is dominated by fine-grained calciturbidites and hemipelagites deposited in deeper-water settings. The Bohemian Graptolite Event (BGE) is interpreted to correspond to a ~2 m-thick interval characterized by a typical alternation of grey platy limestones and several-centimetres-thick intercalations of dark calcareous shales, situated within a sequence of bedded nodular limestones. This interval can be correlated with the BGE position in other sections in the Prague Synform based on spectral gamma-ray curves, trends in δ¹³C record, REEN patterns, and slightly elevated enrichment factors of elements sensitive to palaeoredox and palaeoproductivity changes. The correlation is also partly confirmed by scarce conodont data. The importance of the precise correlation of the BGE across several sections in the Prague Synform lies in approximation of the level for prospective redefinition of the basal Emsian boundary.
