Roehl, Ursula; Ogg, James G.; Geib, Tricia L.; Wefer, Gerold (2001): Astronomical calibration of the Danian time scale. Geological Society of London, London, United Kingdom, In: Kroon, Dick (editor), Norris, Richard D. (editor), Klaus, A. (editor), Western North Atlantic Palaeogene and Cretaceous palaeoceanography, 183, 163-183, georefid:2001-079995
Abstract:
Ocean Drilling Program Sites 1001A (Caribbean Sea) and 1050C (western North Atlantic) display obliquity and precession cycles throughout polarity zone C27 of the late Danian stage (earliest Cenozoic time). Sliding-window spectra analysis and direct cycle counting on downhole logs and high-resolution Fe variations at both sites yield the equivalent of 35-36 obliquity cycles. This cycle-tuned duration for polarity chron C27 of 1.45 Ma (applying a modern mean obliquity period of 40.4 ka) is consistent with trends from astronomical tuning of early Danian polarity chron C29 and (super 40) Ar/ (super 39) Ar age calibration of the Campanian-Maastrichtian magnetic polarity time scale. The cycle-tuned Danian stage (sensu Berggren et al. 1995, in SEPM Special Publications, 54, 129-212) spans 3.65 Ma (65.5-61.85 Ma). Spreading rates on a reference South Atlantic synthetic profile display progressive slowing during the Maastrichtian to Danian stages, then remained relatively constant through late Palaeocene and early Eocene time.
Coverage:
West: -83.0000 East: -65.0000 North: 30.0900 South: 10.3000
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