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The K–Pg boundary is dated to 66.043 ± 0.043 Ma

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Renne and colleagues published high-precision argon-40/argon-39 ages for tektites from the impact ejecta and for volcanic ash beds bracketing the boundary in terrestrial sections, placing the Cretaceous–Palaeogene boundary at 66.043 ± 0.043 million years and showing that the impact and the boundary are indistinguishable in time to within about thirty thousand years. The result also moved the boundary about half a million years younger than the previously accepted 65.5 Ma figure — an example of a date changing not because new rock was found but because the argon system was recalibrated against uranium–lead. The precision matters for the argument: an impact separated from the extinction by even a few hundred thousand years would be a coincidence rather than a cause.

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Assembled from 22 blocks · 1 evidence · 18 related

  1. Story
  2. Renne and colleagues published high-precision argon-40/argon-39 ages for tektites from the impact ejecta and for volcanic ash beds bracketing the boundary in terrestrial sections, placing the Cretaceous–Palaeogene boundary at 66.043 ± 0.043 million years and showing that the impact and the boundary are indistinguishable in time to within about thirty thousand years. The result also moved the boundary about half a million years younger than the previously accepted 65.5 Ma figure — an example of a date changing not because new rock was found but because the argon system was recalibrated against uranium–lead. The precision matters for the argument: an impact separated from the extinction by even a few hundred thousand years would be a coincidence rather than a cause.
  3. Knowledge
  4. Radiometric dating
  5. Chicxulub impact crater, Yucatán
  6. The K–Pg boundary is dated to 66.043 ± 0.043 Ma
  7. Connections
  8. Radiometric dating
  9. Chicxulub impact crater, Yucatán
  10. Mass extinction
  11. Zircon as a geochronometer
  12. Molecular clock dating
  13. The end-Permian mass extinction
  14. Sulfur mass-independent fractionation is proposed as an atmospheric oxygen proxy
  15. The K–Pg boundary is dated to 66.043 ± 0.043 Ma
  16. The end-Permian extinction is resolved to about sixty thousand years
  17. The Cretaceous–Palaeogene mass extinction
  18. The K–Pg boundary is dated to 66.043 ± 0.043 Ma
  19. Chicxulub is identified as the K–Pg impact crater
  20. IODP–ICDP Expedition 364 drills the Chicxulub peak ring
  21. Evidence
  22. Supports the boundary age of 66.043 ± 0.043 Ma and the finding that the Chicxulub impact and the extinction horizon are indistinguishable in time. V55 verification basis: this session had no network access to any source — WebFetch was egress-blocked and the WebSearch budget was exhausted — so the cited work was not retrieved and its pagination was not re-checked. Volume and page range are quoted from standing knowledge and were not re-checked.
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