Geobiologia - Applied Stratigraphy by E. Koutsoukos

By E. Koutsoukos

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G. compare Premoli Silva and Jenkins, 1998, with Brinkhuis and Visscher, 1995], while Mesozoic and Paleozoic stages continue to be accepted as fundamental divisions of the global time scale even though their boundaries are still traced in poorly controlled biostratigraphy. g. , 1996). , 1988) are being extended to ever older levels, so that stage-level precision in global correlation has become commonplace and practical in the Cenozoic, and is beginning to challenge simplistic biostratigraphy in earlier levels.

1 Introduction Improvements in stratigraphic dating methods have transformed chronostratigraphy into a practical tool that reveals unexpected realities in the place of earlier conventions. As strata become more precisely ordered in time, applied chronostratigraphy allows us to unravel cause and effect across facies boundaries and gaps, to resolve the context of past changes, and to find relationships between the proxy records of vanished forces found in different lines of evidence.

A biozonal scheme, an isotopic curve, a paleoclimatic or eustatic series, a geomagnetic polarity buried time: chronostratigraphy as a research tool 29 stratigraphy, or to the boundaries in a time scale – but it has no intrinsic value in absolute time. The absolute or numerical ages that we ascribe to a relatively dated level are derived secondarily according to geochronometric calibration of the model in which the relative age is fixed, or (rarely and accidentally) by direct dating of the stratum itself.

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