Scaling and the Palaeogeographical Distribution of Stratigraphic Events
The RASC computer program for ranking and scaling of biostratigraphic events (Agterberg 1990; Gradstein et al. 1985) can be used to construct a composite zonation (standard) for the sedimentary record of a basin. This zonation of nonrecurrent stratigraphic events is primarily based on averaged first and last occurrences of fossil taxa in the stratigraphic record but other types of events (log-markers, Scismic events, sequence boundaries) can be incorporated. The basic requirement for an event to be included in the final zonation is that it can be uniquely identified in at least one stratigraphic section or well. The zonation is initially constructed using the observed superpositional relationships for coexisting pairs of taxa that are relatively abundant. Events that can be determined with certainty in the sections are weighted more strongly. Selected rare events that occur in one or a few sections only within the basin but are of global significance, can be inserted into the final solution by invoking the RASC unique (rare) events option.
KeywordsPetroleum Sedimentation Stratigraphy Mudstone Eocene
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