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Is the claimed boundary layer the same age at every site?

Most likely: the claimed layers are of different ages, or their ages are not known well enough to sayAhead on the evidence, not yet confirmed. It needs two reviews to be accepted.

Where it stands

Three answers have been proposed. The claimed layers are of different ages, or their ages are not known well enough to say. leads, with evidence 3 for: supported by its tests. Two are still possible. Of the one narrower question under it, none is answered yet.

Why it matters

Proponents themselves name synchrony as a key test: a single cosmic event must leave a layer of one age⁠[1]. It is also where the 2026 retraction of the shocked-quartz paper turned⁠[2].

Answers 3

None of these.
Not tested enough to call either way
Evidence: none yet
Still possible
Evidence: 1 for
Disputed

History

  1. Meltzer et al. puts forward: the claimed layers are of different ages, or their ages are not known well enough to say.
  2. Meltzer et al.: several claimed sites have no age control, nearly a dozen use flawed age-depth interpolations, and several…For: The claimed layers are of different ages, or their ages are not known well enough to say.
  3. Kennett et al. puts forward: the boundary layer at all sites dates to 12,835–12,735 cal BP within dating error.
  4. Kennett et al.: two statistical tests on modelled and unmodelled ages from 30 records are consistent with synchronous…For: The boundary layer at all sites dates to 12,835–12,735 cal BP within dating error.
  5. The PLOS One Editors: the retracted shocked-quartz paper omitted available dates, used dates spanning centuries and reported no age…For: The claimed layers are of different ages, or their ages are not known well enough to say.
  6. The PLOS One Editors: recalibrating the Baffin Bay foraminifera dates by the recommended method moves them outside the Younger…For: The claimed layers are of different ages, or their ages are not known well enough to say.
  7. Asked on this site
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