Geochronological accuracy around the cretaceous paleogene boundary interval insights and challenges to the age of chron C29r and intervening events

Yılmaz, İsmail Ömer
Stoykova, Kristina
The need for precise and accurate time constraints in Earth sciences is pivotal to successfully unravel geological mechanisms and rates of processes. Timescale accuracy is a prerequisite for reliable event correlation and to disentangle intricate complex climatic and biotic changes. The late Cretaceous, a time interval of major biodiversity adjustments culminating in the end-Cretaceous mass extinction, has been the subject of intense debates regarding not only its causes but also the timing. The Cretaceous-Paleogene (K-Pg) boundary occurs within Chron C29r. Its numerical age and the relative position within C29r has changed significantly over different instances of the GPTS. The radiometric absolute age of the K-Pg boundary has now been established at 66.043 ± 0.043 Ma by high-precision 40 Ar/ 39 Ar dating on tektites and bentonites associated with the boundary. The age close to 66 Ma is compatible with astronomical tuned chronologies derived from integrated magneto/chemo/biostratigraphic studies from marine sequences that have provided complete orbital chronologies for the Maastrichtian and Paleocene at eccentricity resolution (~100-400 ky). These studies also place the K-Pg halfway C29r with a calibrated Chron duration of ~710 ky. However, a recent chronostratigraphic study of the terrestrial K-Pg transition in the Hell Creek region (Montana) including 40 Ar/ 39 Ar dating of 15 tephra layers challenge the duration of C29r to as brief as ~345 ky. Here, the chronological framework of C29r is reappraised and studied at orbital precession resolution (~21 ky) using an array of deep sea records and new data from pelagic strata from the Bjala section (Bulgaria) and the Mudurnu-Goynuk basin (NW Turkey).
26th IUGG, (22 Haziran - 02 Temmuz 2015)


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Citation Formats
İ. Ö. Yılmaz and K. Stoykova, “Geochronological accuracy around the cretaceous paleogene boundary interval insights and challenges to the age of chron C29r and intervening events,” Prag, Çek Cumhuriyeti, 2015, p. 3042, Accessed: 00, 2021. [Online]. Available: