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Abstract
The Viki drill core is one of the reference sections for the Estonian bedrock succession, characterizing strata of Mid Ordovician through early Silurian age in the eastern part of the Baltoscandian basin. In this article, we present the hitherto missing Ordovician stable carbon isotope curve and Middle Ordovician conodont biostratigraphy from the Viki core to complement the previous lithological, geochemical, geophysical and biostratigraphic studies. For the first time, the Hirnantian sulfur isotope excursion is reported from the eastern Baltic region, showing high amplitude and tight coupling with carbon cycling.
Acknowledgements
The authors are grateful to Mikael Calner and Michael Joachimski for their constructive reviews, and to the guest editors of the “Early Palaeozoic Global Change” special issue. This study was supported by the Estonian Research Council (projects ETF9039,ETF8182, SF0140020s08) and National Natural Science Foundation of China (project 41330102). It is a contribution to the IGCP project 591.
