High-precision U-Pb zircon geochronology of the Late Triassic Chinle Formation, Petrified Forest National Park (Arizona, USA): Temporal constraints on the early evolution of dinosaurs

Dworkin, S I; Ramezani, J.; Hoke, G D; Bowring, S A; Therrien, F; Atchley, S. C.; Nordt, L. C.; Fastovsky, D E

doi:10.1130/B30433.1

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High-precision U-Pb zircon geochronology of the Late Triassic Chinle Formation, Petrified Forest National Park (Arizona, USA): Temporal constraints on the early evolution of dinosaurs

Author(s): J. Ramezani , G. D. Hoke , D. E. Fastovsky , S. A. Bowring , F. Therrien , S. I. Dworkin , S. C. Atchley , L. C. Nordt

Publication date Created: September 30 2011

Publication date (Print): August 19 2011

Journal: Geological Society of America Bulletin

Publisher: Geological Society of America

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Synchronizing rock clocks of Earth history.

K. Kuiper, A. Deino, F. Hilgen … (2008)

Calibration of the geological time scale is achieved by independent radioisotopic and astronomical dating, but these techniques yield discrepancies of approximately 1.0% or more, limiting our ability to reconstruct Earth history. To overcome this fundamental setback, we compared astronomical and 40Ar/39Ar ages of tephras in marine deposits in Morocco to calibrate the age of Fish Canyon sanidine, the most widely used standard in 40Ar/39Ar geochronology. This calibration results in a more precise older age of 28.201 +/- 0.046 million years ago (Ma) and reduces the 40Ar/39Ar method's absolute uncertainty from approximately 2.5 to 0.25%. In addition, this calibration provides tight constraints for the astronomical tuning of pre-Neogene successions, resulting in a mutually consistent age of approximately 65.95 Ma for the Cretaceous/Tertiary boundary.