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[Poster 1a] Diagram 1A: Example of definition of biostratigraphic events.

[Poster 1b] Diagram 1B: Examples of events distributions (from Gradstein and Agterberg, in press).
In order to increase biostratigraphic resolution, attempts are made to recognize up to 5 correlative events along the stratigraphic range of a taxon. Unfortunately, such events often have limited geographic traceability.

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