The 2009 paper 'An Independent Evaluation of the Younger Dryas Extraterrestrial Impact Hypothesis' was published in Proceedings of the National Academy of Sciences on October 27, 2009, spanning pages 18155 to 18158.
Notes on verification
Confirmed by PNAS official record, PubMed listing, and JSTOR entry, all matching exact publication details including date and page range. [tier=silver indep_score=1.0 clusters=2 claim_tier=everyday]
Sources
- An independent evaluation of the Younger Dryas - jstor (seed:history_and_archaeology)
- https://www.pnas.org/doi/10.1073/pnas.0908191106 (corroboration)
- https://pubmed.ncbi.nlm.nih.gov/19822748/ (corroboration)