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Quantitative Biostratigraphy: A Key to Sequence Stratigraphy
Sequence stratigraphy integrates diverse geophysical and geological data sets, and it has revitalized both geoscience disciplines. Biostratigraphic data have become important to the geological interpretation of seismic record sections. Quantitative analyses of fossil abundances, diversities, and ranges provide important data for the definition and constraint of sequence stratigraphic hypotheses. Within carbonate platforms, sequence boundaries may separate similar facies and become difficult to recognize. Within mixed siliciclastic and carbonate facies successions, the subtle changes in biotic associations define the stacking pattern of bed sets and aid the recognition of sequence boundaries. Quantitative biotic analyses of vertical facies successions constrain the depth limits of the beds. The timing of sea-level changes and their correlation within and between basins are essential for distinguishing the relative effects of basinal tectonics and eustasy. This distinction enlightens the prediction of potential reservoirs within a basin.
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