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Calibration of chron C29r: New high-precision geochronologic and paleomagnetic constraints from the Hell Creek region, Montana

Sprain, Courtney J., Renne, Paul R., Clemens, William A., Wilson, Gregory P.·2018·GSA Bulletin
DOI 10.1130/b31890.1
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Abstract

The mass extinction at the Cretaceous- Paleogene boundary marks one of the most important biotic turnover events in Earth history. Yet, despite decades of study, the causes of the Cretaceous-Paleogene boundary crises remain under debate. An important tool that has the capacity to greatly improve our understanding of the events around the Cretaceous-Paleogene boundary is the geomagnetic polarity time scale (GPTS). The GPTS is used for age control in numerous Cretaceous-Paleogene boundary studies, including the timing of Deccan Traps volcanism, a majority of studies in marine sections, and studies on climate and ecological change across the Cretaceous-Paleogene boundary. The current calibration of the GPTS for circum- Cretaceous-Paleogene boundary polarity chrons (C30n-C28n) from the Geologic Time Scale draws heavily on astronomical tuning and uses a 40Ar/39Ar age for the Cretaceous- Paleogene boundary as a tie point that has since been shown to be 200 ka too old. Furthermore, complex sedimentation has been recorded in marine sections immediately following the Cretaceous-Paleogene boundary, which can possibly obscure orbital signals and complicate cyclostratigraphic interpretation. An independent test of the cyclostratigraphy for this time period is imperative for confidence in the astronomical time scale. Further, polarity reversal ages given in the GPTS do not include uncertainty estimates, making them unsuitable for quantitative chronometry. Recent calibrations have been att…

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Cited by

Metadata

Authors
Sprain, C. J., Renne, P. R., Clemens, W. A., & Wilson, G. P.
Affiliations
  • Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
  • Department of Integrative Biology, University of California, Berkeley, California 94720, USA
  • Department of Biology and Burke Museum of Natural History and Culture, University of Washington, Seattle, Washington 98195, USA
Venue
GSA Bulletin
Publisher
Geological Society of America
Published
2018-05-02
Volume
130
Issue
9-10
Pages
1615-1644
ISSN
0016-7606
DOI
10.1130/b31890.1
Cited by
130
References
3
Language
en

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