Abstract
The main characteristics of a carbon isotope 'event' associated with a glaciation and mass extinctions of biota in the latest Ordovician have been well demonstrated during a few last years (Marshall et al., 1997; etc.). Also Estonian material (brachiopod shells, kerogen) was involved, but due to complications of local geology only a generalized 613C curve could be constructed. Below we present the data obtained by analysing bulk carbonate rock samples from drill cores and the stratotype of the Hirnantian Porkuni Stage, with the aim to establish a continuous carbon isotope curve through the uppermost Ordovician of Estonia.
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