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MORE ABOUT ORDOVICIAN MICROFOSSIL DIVERSITY PATTERNS IN THE RAPLA SECTION, NORTHERN ESTONIA

In the last decade different events in the Earth's history have aroused wide interest in the world's scientific community. As a result, several IGCP projects were organized to stimulate detailed studies of the most important events, among them was the one that took place at the end of the Ordovician. In order to understand better the causes and the mechanisms of bioevents, various background studies are needed, especially those describing temporal changes in the taxonomical diversity of different groups of organisms. The study presented here is based on a geographically limited data set derived from a single borehole section, but it covers a comprehensive portion of the Ordovician sequence, from the upper Arenig to topmost Ashgill, in terms of the East Baltic stratigraphic classification from the Volkhov to Porkuni stages. Correlation of the latter with British series is given according to Mannil (1990).