Geochronology
Geochronology
GChron
Articles | Volume 6, issue 3
Articles | Volume 6, issue 3
https://doi.org/10.5194/gchron-6-325-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-6-325-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 6, issue 3
Short communication/technical note
 | 
05 Jul 2024
Short communication/technical note |  | 05 Jul 2024

Short communication: Resolving the discrepancy between U–Pb age estimates for the “Likhall” bed, a key level in the Ordovician timescale

André Navin Paul, Anders Lindskog, and Urs Schaltegger

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Cited articles

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Ballo, E. G., Augland, L. E., Hammer, Ø., and Svensen, H. H.: A new age model for the Ordovician (Sandbian) K-bentonites in Oslo, Norway, Palaeogeogr. Palaeocl., 520, 203–213, https://doi.org/10.1016/J.PALAEO.2019.01.016, 2019. 
Bergström, S. M.: Use of graphic correlation for assessing event-stratigraphic significance and trans-Atlantic relationships of Ordovician K-bentonites, Proc. Acad. Sci. Est. SSR, 38, 55–59, 1989. 
Bowring, J. F., McLean, N. M., and Bowring, S. A.: Engineering cyber infrastructure for U-Pb geochronology: Tripoli and U-Pb-Redux, Geochem. Geophys. Geosyst., 12, Q0AA19, https://doi.org/10.1029/2010GC003479, 2012. 
Brenhin Keller, C., Boehnke, P., Schoene, B., and Harrison, T. M.: Stepwise chemical abrasion–isotope dilution–thermal ionization mass spectrometry with trace element analysis of microfractured Hadean zircon, Geochronology, 1, 85–97, https://doi.org/10.5194/gchron-1-85-2019, 2019. 
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Short summary
The “Likhall” bed helps to constrain the timing of increased meteorite bombardment of the Earth during the Ordovician period. It is important to understand the timing of this meteorite bombardment when attempting to correlate it with biodiversity changes during the Ordovician period. Calibrating a good age for the “Likhall” bed is, however, challenging and benefited in this study from advances in sample preparation.
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