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  "id": "firestone-pnas-2007",
  "title": "Evidence for an Extraterrestrial Impact 12,900 Years Ago",
  "description": {
    "en": "Richard Firestone, Allen West, James Kennett, and twenty-two co-authors' October 2007 *Proceedings of the National Academy of Sciences* paper — the principal peer-reviewed scientific publication of the Younger Dryas Impact Hypothesis. The paper reports geochemical and stratigraphic evidence (a layer of nanodiamonds, magnetic spherules, and platinum-group anomalies at the Younger Dryas boundary) consistent with a substantial extraterrestrial impact event at approximately 12,900 years before present. The hypothesis remains contested in mainstream science; this paper is the foundational scientific source."
  },
  "authored_by": [
    "Richard B. Firestone",
    "Allen West",
    "James P. Kennett",
    "et al."
  ],
  "topics": [
    "Younger Dryas",
    "Impact Hypothesis",
    "Late Pleistocene",
    "Antediluvian"
  ],
  "stance": "neutral",
  "source_type": "academic_article",
  "publish_date": "2007",
  "source_family": "science",
  "relation_to_wheel": "scientific_context",
  "licensing_status": "licensed",
  "follow_url": "https://www.pnas.org/doi/10.1073/pnas.0706977104"
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