Cretaceous chronostratigraphy requires an interdisciplinary approach

Author(s): Premoli Silva, Isabella
Author Affiliation(s): Primary:
Universita di Milano, Dipartimento di Scienze della Terra "Ardito Desio", Milan, Italy
Volume Title: 34th international geological congress; abstracts
Source: International Geological Congress [International Geological Congress, Abstracts = Congrès Géologique International, Résumés, Vol.34, p.751; 34th international geological congress, Brisbane, Queensl., Australia, Aug. 5-10, 2012. Publisher:], [location varies], International CODEN: IGABBY
Note: In English
Summary: A wealth of data on various aspects of Cretaceous stratigraphy had continued to be published up to now providing a continuous amelioration of the multiple stratigraphic framework that today spans most of the Cretaceous frequently in high resolution. If so, why out of the 12 stages of the Cretaceous System only three stages have a ratified GSSP plus a forth one now in ballot? The extensive recovery of continuous pelagic successions by the DSDP-ODP projects in all oceans posed several problems of correlation with the classical sections, stratotypes included, frequently of limited exposures and affected by numerous discontinuities. In addition, the biostratigraphy of these classical sections is based on macrofossils, frequently of limited geographical distribution, that are absent in deep-sea sediments, primarily dated by calcareous plankton. To overcome such a bias, biostratigraphies have been integrated with magneto- and isotope stratigraphies. However, the "Long Magnetic Normal" prevents the calibration of the bioevents in most Upper Cretaceous, and not all the lithologies are suitable for magnetic investigations. The d13C-based isotope stratigraphy proved to be a reliable tool at least in some intervals, allowing to correlate sections from different basins and settings and to detect even minor hiatuses. The interdisciplinary approach, imperative for defining the Cretaceous chronostratigraphy, resulted in slow progresses in term of GSSP definitions.
Year of Publication: 2012
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Accuracy; Biostratigraphy; Chemostratigraphy; Chronostratigraphy; Correlation; Cretaceous; Data integration; Deep Sea Drilling Project; Efficiency; Errors; Magnetostratigraphy; Mesozoic; Methods; Ocean Drilling Program; Reliability; Stratigraphic boundary; Stratigraphic units; Stratotypes; Type sections
Record ID: 2015113797
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by International Geological Congress Organizational Committee

Similar Items