Overview
Younger Dryas Impact Hypothesis
Reported platinum, spherule, charcoal, melt, and other anomalies require marker-specific tests of identity, background, date, diagnosticity, replication, and causal power.
Evidence on this page
- Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: https://doi.org/10.1073/pnas.0706977104. Role: founding broad modern hypothesis; historical claim source.
- Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test.
- Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis.
Important limits
- Bibliographic verification does not by itself establish that the full text was read.
- One new study strengthens a volcanic alternative but does not alone establish a complete field-wide causal consensus.
Current assessment
This assessment belongs to this record only. A connection never transfers evidence status from another topic.
Source foundation
16 public source records are linked to this topic. Source quantity does not replace source quality or methodological review.
- 10 Academic
- 3 Corrective
- 2 Claim Tracking
- 1 Primary
16 academic-paper records · 6 with explicit free-full-text or open-access status
Claim review
Greenland Stadial 1/Younger Dryas conditions began abruptly in Greenland and North Atlantic records and ended near the Holocene boundary.
What the cited material supports
Greenland Stadial 1/Younger Dryas climate conditions began abruptly and ended near the Holocene boundary.
Canonical sources cited
- Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis. · academic
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review. · academic
Greenland Stadial 1/Younger Dryas conditions began abruptly in Greenland and North Atlantic records and ended near the Holocene boundary.
Well supportedWhere the interpretations diverge
See Internet Folklore and Claim Mutation section.
What the cited evidence does not establish
Follow the claim source trail
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
What the cited material supports
Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
Canonical sources cited
- Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test. · academic
- Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis. · academic
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review. · academic
- Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review. · academic
- Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8. · academic
- Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly. · academic
- Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation. · academic
- PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613. · corrective
- PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons. · corrective
- PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620. · corrective
- Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030. · academic
Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
Active debateWhere the interpretations diverge
See Internet Folklore and Claim Mutation section.
What the cited evidence does not establish
Follow the claim source trail
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613.
Corrective · verified
A retraction notice governs the named paper; it does not automatically adjudicate every independent YDIH paper.
- PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons.
Corrective · verified
Bibliographic verification does not by itself establish that the full text was read.
- PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620.
Corrective · verified
The notice governs the retracted paper and should not be generalized beyond its stated reasons.
- Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030.
Academic · verified
One new study strengthens a volcanic alternative but does not alone establish a complete field-wide causal consensus.
A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What the cited material supports
Claim extracted from the installed dossier scorecard.
Canonical sources cited
- Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: https://doi.org/10.1073/pnas.0706977104. Role: founding broad modern hypothesis; historical claim source. · claim-tracking
- Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis. · academic
- Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review. · academic
- Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test. · academic
- Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis. · academic
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review. · academic
- Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8. · academic
- Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030. · academic
- Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly. · academic
- Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation. · academic
- PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613. · corrective
- PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons. · corrective
- PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620. · corrective
A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
Weakly supportedWhere the interpretations diverge
See Internet Folklore and Claim Mutation section.
What the cited evidence does not establish
Follow the claim source trail
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: https://doi.org/10.1073/pnas.0706977104. Role: founding broad modern hypothesis; historical claim source.
Claim Tracking · verified
Bibliographic verification does not by itself establish that the full text was read.
- Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030.
Academic · verified
One new study strengthens a volcanic alternative but does not alone establish a complete field-wide causal consensus.
- Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
- PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613.
Corrective · verified
A retraction notice governs the named paper; it does not automatically adjudicate every independent YDIH paper.
- PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons.
Corrective · verified
Bibliographic verification does not by itself establish that the full text was read.
- PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620.
Corrective · verified
The notice governs the retracted paper and should not be generalized beyond its stated reasons.
Claim genealogy
Only explicitly recorded claimant/source and citation relationships appear. Popularity is not evidence.
Evidence and claims
Evidence Ledger
Firestone, Richard B
Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: https://doi.org/10.1073/pnas.0706977104. Role: founding broad modern hypothesis; historical claim source.
What this supports
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: https://doi.org/10.1073/pnas.0706977104. Role: founding broad modern hypothesis; historical claim source.
Claim Tracking · verified
Bibliographic verification does not by itself establish that the full text was read.
Surovell, Todd A
Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Pinter, Nicholas, et al
Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis.
What this supports
- Greenland Stadial 1/Younger Dryas conditions began abruptly in Greenland and North Atlantic records and ended near the Holocene boundary.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Petaev, Michail I
Petaev, Michail I., et al. (2013). “Large Pt anomaly in the Greenland ice core…” _PNAS_ 110(32): 12917–12920. DOI: https://doi.org/10.1073/pnas.1303924110. Role: primary Pt anomaly observation; cite its caution.
What this supports
No direct public claim-support relationship is recorded for this evidence item.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Petaev, Michail I., et al. (2013). “Large Pt anomaly in the Greenland ice core…” _PNAS_ 110(32): 12917–12920. DOI: https://doi.org/10.1073/pnas.1303924110. Role: primary Pt anomaly observation; cite its caution.
Primary · verified
Bibliographic verification does not by itself establish that the full text was read.
Sweatman, Martin B
Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Kenny, Gavin G
Kenny, Gavin G., et al. (2022). “A Late Paleocene age for Greenland’s Hiawatha impact structure.” _Science Advances_ 8(10). DOI: https://doi.org/10.1126/sciadv.abm2434. Role: rules out prominent crater candidate.
What this supports
No direct public claim-support relationship is recorded for this evidence item.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Kenny, Gavin G., et al. (2022). “A Late Paleocene age for Greenland’s Hiawatha impact structure.” _Science Advances_ 8(10). DOI: https://doi.org/10.1126/sciadv.abm2434. Role: rules out prominent crater candidate.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Holliday, Vance T
Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
What this supports
- Greenland Stadial 1/Younger Dryas conditions began abruptly in Greenland and North Atlantic records and ended near the Holocene boundary.
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Sweatman, Martin B
Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Holliday, Vance T
Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Green, Charlotte E
Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly.
What this supports
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
PLOS One Editors (2026)
PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons.
What this supports
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons.
Corrective · verified
Bibliographic verification does not by itself establish that the full text was read.
Moore, Christopher R
Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
Bibliographic verification does not by itself establish that the full text was read.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation.
Academic · verified
Bibliographic verification does not by itself establish that the full text was read.
Lucien Nana Yobo et al
Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
One new study strengthens a volcanic alternative but does not alone establish a complete field-wide causal consensus.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030.
Academic · verified
One new study strengthens a volcanic alternative but does not alone establish a complete field-wide causal consensus.
Christopher R
Christopher R. Moore et al. (2025), ‘A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0328347. RETRACTED 2026.
What this supports
No direct public claim-support relationship is recorded for this evidence item.
What this does not establish
Retracted; do not use as positive evidence. Read with the authoritative retraction notice.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- Christopher R. Moore et al. (2025), ‘A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0328347. RETRACTED 2026.
Claim Tracking · verified
Retracted; do not use as positive evidence. Read with the authoritative retraction notice.
PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspheru…
PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
A retraction notice governs the named paper; it does not automatically adjudicate every independent YDIH paper.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613.
Corrective · verified
A retraction notice governs the named paper; it does not automatically adjudicate every independent YDIH paper.
PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12
PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620.
What this supports
- Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
What this does not establish
The notice governs the retracted paper and should not be generalized beyond its stated reasons.
Follow the Source
This trail lists canonical source records attached to this item. Display order does not imply evidentiary rank or historical sequence.
- PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620.
Corrective · verified
The notice governs the retracted paper and should not be generalized beyond its stated reasons.
View as Evidence Matrix
Each row remains a separate evidence record. One proxy or finding does not automatically determine the assessment of an entire compound claim.
| ID | Evidence | Supports | Challenges | Main limitation | Sources |
|---|---|---|---|---|---|
| CM-025-EV-001 | Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: https://doi.org/10.1073/pnas.0706977104. Role: founding broad modern hypothesis; historical claim source. | A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-002 | Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-003 | Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis. | Greenland Stadial 1/Younger Dryas conditions began abruptly in Greenland and North Atlantic records and ended near the Holocene boundary.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-004 | Petaev, Michail I., et al. (2013). “Large Pt anomaly in the Greenland ice core…” _PNAS_ 110(32): 12917–12920. DOI: https://doi.org/10.1073/pnas.1303924110. Role: primary Pt anomaly observation; cite its caution. | No direct public support relationship recorded | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-005 | Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-006 | Kenny, Gavin G., et al. (2022). “A Late Paleocene age for Greenland’s Hiawatha impact structure.” _Science Advances_ 8(10). DOI: https://doi.org/10.1126/sciadv.abm2434. Role: rules out prominent crater candidate. | No direct public support relationship recorded | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-007 | Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review. | Greenland Stadial 1/Younger Dryas conditions began abruptly in Greenland and North Atlantic records and ended near the Holocene boundary.; Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-008 | Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-009 | Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-010 | Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly. | A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-011 | PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons. | A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-012 | Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | Bibliographic verification does not by itself establish that the full text was read. | 1 |
| CM-025-EV-013 | Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | One new study strengthens a volcanic alternative but does not alone establish a complete field-wide causal consensus. | 1 |
| CM-025-EV-014 | Christopher R. Moore et al. (2025), ‘A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0328347. RETRACTED 2026. | No direct public support relationship recorded | No direct public challenge relationship recorded | Retracted; do not use as positive evidence. Read with the authoritative retraction notice. | 1 |
| CM-025-EV-015 | PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | A retraction notice governs the named paper; it does not automatically adjudicate every independent YDIH paper. | 1 |
| CM-025-EV-016 | PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620. | Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.; A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished. | No direct public challenge relationship recorded | The notice governs the retracted paper and should not be generalized beyond its stated reasons. | 1 |
Timeline
~12,900–11,700 years ago
Approximate ordering never replaces this visible date basis.
About 12,900 years ago: Younger Dryas onset.
Approximate ordering never replaces this visible date basis.
Local Atlas Map
Accessible local relationship list
Younger Dryas Impact Hypothesis → Last Glacial Maximum
Inspect connection as text
What this does not prove
This chronological relationship neither establishes an extraterrestrial trigger nor makes the LGM and Younger Dryas the same event.
Supporting sources: Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis., Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
Younger Dryas Impact Hypothesis → Meltwater Pulse 1A
Inspect connection as text
What this does not prove
Chronological separation does not by itself resolve meltwater sources or the cause of the Younger Dryas.
Supporting sources: Clark et al. (2002), sea-level fingerprinting and Meltwater Pulse 1A, Deschamps et al. (2012), ice-sheet collapse and sea-level rise at Bølling warming, Lin et al. (2021), reconciled Meltwater Pulse 1A sources
Younger Dryas Impact Hypothesis → Younger Dryas Boundary
Inspect connection as text
What this does not prove
This is a claim-structure hierarchy, not evidence that an impact occurred or caused the climate transition, extinctions, or cultural change.
Supporting sources: A stratigraphic framework for abrupt climatic changes during the Last Glacial period based on three synchronized Greenland ice-core records: refining and extending the INTIMATE event stratigraphy, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling
Younger Dryas Impact Hypothesis → Younger Dryas Black Mat
Inspect connection as text
What this does not prove
This claim-family hierarchy does not make black mats diagnostic of impact, synchronous, or causal for extinctions and cultural change.
Supporting sources: Younger Dryas “black mats” and the Rancholabrean termination in North America, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Clovis Comet Claim
Inspect connection as text
What this does not prove
This is claim taxonomy only; it does not establish that an impact occurred or that Clovis, climate, and extinctions had one cause.
Supporting sources: Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Younger Dryas Airburst at Abu Hureyra
Inspect connection as text
What this does not prove
The hierarchy records claim placement only; it does not prove the site was struck, validate the global YDIH, or promote CM-318.
Supporting sources: Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C, Correction: Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C, The Younger Dryas impact hypothesis: A requiem, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Graham Hancock
Inspect connection as text
What this does not prove
The mechanism debate is logically separate from evidence for a lost civilization, its destruction, or survivor transmission.
Supporting sources: Magicians of the Gods, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH), Rejection of Holliday et al.'s alleged refutation of the Younger Dryas impact hypothesis
Younger Dryas Impact Hypothesis → Randall Carlson
Inspect connection as text
What this does not prove
Carlson's role as a popularizer is claim provenance, not independent confirmation of an impact, flood-memory transmission, or civilization reset.
Supporting sources: RandallCarlson.com, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH), Rejection of Holliday et al.'s alleged refutation of the Younger Dryas impact hypothesis
Younger Dryas Impact Hypothesis → Carolina Bays
Inspect connection as text
What this does not prove
This claim-family hierarchy does not make bay morphology diagnostic of impact or establish Younger Dryas age, ejecta, or causation.
Supporting sources: A model for the geomorphology of the Carolina Bays, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Ancient Catastrophes
Inspect connection as text
What this does not prove
The Younger Dryas transition is real, but category membership does not validate the impact markers, causal mechanism, or civilization-collapse extensions.
Supporting sources: Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Ice Age Civilization Theory
Inspect connection as text
What this does not prove
The edge records a disputed mechanism and does not establish an impact, a destroyed civilization, a reset, or survivor transmission.
Supporting sources: The Younger Dryas impact hypothesis: A requiem
Younger Dryas Impact Hypothesis → Taurid Meteor Stream
Inspect connection as text
What this does not prove
A plausible astronomical source population does not establish a 12.8 ka impact, its location, magnitude, or climatic and extinction effects.
Supporting sources: Palaeolithic extinctions and the Taurid Complex, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Graham Hancock Ancient Apocalypse Theory
Inspect connection as text
What this does not prove
Use of YDIH in the narrative does not establish the impact hypothesis, a lost civilization, or a causal destruction-and-transmission sequence.
Supporting sources: Ancient Apocalypse | Netflix Series - Graham Hancock Official Website, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Civilization Reset Theory
Inspect connection as text
What this does not prove
Scientific dispute over an impact does not establish a lost civilization, global social reset, or survivor-teacher transmission.
Supporting sources: Ancient Apocalypse | Netflix Series - Graham Hancock Official Website, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH), Rejection of Holliday et al.'s alleged refutation of the Younger Dryas impact hypothesis
Documented connections
Younger Dryas Impact Hypothesis → Last Glacial Maximum
Inspect connection as text
What this does not prove
This chronological relationship neither establishes an extraterrestrial trigger nor makes the LGM and Younger Dryas the same event.
Supporting sources: Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis., Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
Younger Dryas Impact Hypothesis → Meltwater Pulse 1A
Inspect connection as text
What this does not prove
Chronological separation does not by itself resolve meltwater sources or the cause of the Younger Dryas.
Supporting sources: Clark et al. (2002), sea-level fingerprinting and Meltwater Pulse 1A, Deschamps et al. (2012), ice-sheet collapse and sea-level rise at Bølling warming, Lin et al. (2021), reconciled Meltwater Pulse 1A sources
Younger Dryas Impact Hypothesis → Younger Dryas Boundary
Inspect connection as text
What this does not prove
This is a claim-structure hierarchy, not evidence that an impact occurred or caused the climate transition, extinctions, or cultural change.
Supporting sources: A stratigraphic framework for abrupt climatic changes during the Last Glacial period based on three synchronized Greenland ice-core records: refining and extending the INTIMATE event stratigraphy, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling
Younger Dryas Impact Hypothesis → Younger Dryas Black Mat
Inspect connection as text
What this does not prove
This claim-family hierarchy does not make black mats diagnostic of impact, synchronous, or causal for extinctions and cultural change.
Supporting sources: Younger Dryas “black mats” and the Rancholabrean termination in North America, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Clovis Comet Claim
Inspect connection as text
What this does not prove
This is claim taxonomy only; it does not establish that an impact occurred or that Clovis, climate, and extinctions had one cause.
Supporting sources: Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Younger Dryas Airburst at Abu Hureyra
Inspect connection as text
What this does not prove
The hierarchy records claim placement only; it does not prove the site was struck, validate the global YDIH, or promote CM-318.
Supporting sources: Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C, Correction: Evidence of Cosmic Impact at Abu Hureyra, Syria at the Younger Dryas Onset (~12.8 ka): High-temperature melting at >2200 °C, The Younger Dryas impact hypothesis: A requiem, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Graham Hancock
Inspect connection as text
What this does not prove
The mechanism debate is logically separate from evidence for a lost civilization, its destruction, or survivor transmission.
Supporting sources: Magicians of the Gods, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH), Rejection of Holliday et al.'s alleged refutation of the Younger Dryas impact hypothesis
Younger Dryas Impact Hypothesis → Randall Carlson
Inspect connection as text
What this does not prove
Carlson's role as a popularizer is claim provenance, not independent confirmation of an impact, flood-memory transmission, or civilization reset.
Supporting sources: RandallCarlson.com, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH), Rejection of Holliday et al.'s alleged refutation of the Younger Dryas impact hypothesis
Younger Dryas Impact Hypothesis → Carolina Bays
Inspect connection as text
What this does not prove
This claim-family hierarchy does not make bay morphology diagnostic of impact or establish Younger Dryas age, ejecta, or causation.
Supporting sources: A model for the geomorphology of the Carolina Bays, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Ancient Catastrophes
Inspect connection as text
What this does not prove
The Younger Dryas transition is real, but category membership does not validate the impact markers, causal mechanism, or civilization-collapse extensions.
Supporting sources: Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Ice Age Civilization Theory
Inspect connection as text
What this does not prove
The edge records a disputed mechanism and does not establish an impact, a destroyed civilization, a reset, or survivor transmission.
Supporting sources: The Younger Dryas impact hypothesis: A requiem
Younger Dryas Impact Hypothesis → Taurid Meteor Stream
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What this does not prove
A plausible astronomical source population does not establish a 12.8 ka impact, its location, magnitude, or climatic and extinction effects.
Supporting sources: Palaeolithic extinctions and the Taurid Complex, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Graham Hancock Ancient Apocalypse Theory
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What this does not prove
Use of YDIH in the narrative does not establish the impact hypothesis, a lost civilization, or a causal destruction-and-transmission sequence.
Supporting sources: Ancient Apocalypse | Netflix Series - Graham Hancock Official Website, Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)
Younger Dryas Impact Hypothesis → Civilization Reset Theory
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What this does not prove
Scientific dispute over an impact does not establish a lost civilization, global social reset, or survivor-teacher transmission.
Supporting sources: Ancient Apocalypse | Netflix Series - Graham Hancock Official Website, Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH), Rejection of Holliday et al.'s alleged refutation of the Younger Dryas impact hypothesis
Sources
Academic papers
16 paper citations support or limit this topic; 6 carry explicit free-full-text or open-access status.
Academic
Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: https://doi.org/10.1073/pnas.0907857106. Role: independent replication test.
Why Ancient Inquiry uses this source
independent replication test.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: https://doi.org/10.1016/j.earscirev.2011.02.005. Role: early multidisciplinary critical synthesis.
Why Ancient Inquiry uses this source
early multidisciplinary critical synthesis.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: https://doi.org/10.1016/j.earscirev.2021.103677. Role: supportive synthesis.
Why Ancient Inquiry uses this source
supportive synthesis.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Kenny, Gavin G., et al. (2022). “A Late Paleocene age for Greenland’s Hiawatha impact structure.” _Science Advances_ 8(10). DOI: https://doi.org/10.1126/sciadv.abm2434. Role: rules out prominent crater candidate.
Why Ancient Inquiry uses this source
rules out prominent crater candidate.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: https://doi.org/10.1016/j.earscirev.2023.104502. Role: current central critical review.
Why Ancient Inquiry uses this source
current central critical review.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: https://doi.org/10.1016/j.earscirev.2024.104960. Role: proponent counter-review.
Why Ancient Inquiry uses this source
proponent counter-review.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: https://doi.org/10.1016/j.earscirev.2024.104961. Role: direct answer; display beside item 8.
Why Ancient Inquiry uses this source
direct answer; display beside item 8.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: https://doi.org/10.1371/journal.pone.0331811. Role: new geochemical/chronological alternative for Pt anomaly.
Why Ancient Inquiry uses this source
new geochemical/chronological alternative for Pt anomaly.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: https://doi.org/10.12688/f1000research.184551.1. Role: newest proponent report; awaiting peer review at cutoff, not confirmation.
Why Ancient Inquiry uses this source
newest proponent report; awaiting peer review at cutoff, not confirmation.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Lucien Nana Yobo et al. (2026), ‘Volcanic forcing of global climate cooling at the Younger Dryas onset preserved in North American sediments,’ Science Advances. DOI: https://doi.org/10.1126/sciadv.aec9030.
Why Ancient Inquiry uses this source
Peer-reviewed multi-site Os-isotope and highly siderophile element evidence consistent with volcanic forcing; current alternative evidence.
What it does not establish
One new study strengthens a volcanic alternative but does not alone establish a complete field-wide causal consensus.
Claim Tracking
Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: https://doi.org/10.1073/pnas.0706977104. Role: founding broad modern hypothesis; historical claim source.
Why Ancient Inquiry uses this source
founding broad modern hypothesis; historical claim source.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Christopher R. Moore et al. (2025), ‘A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0328347. RETRACTED 2026.
Why Ancient Inquiry uses this source
Retracted primary claim retained only for provenance and correction history. Retracted original; retained only for claim history and must not be used as unqualified evidence.
What it does not establish
Retracted; do not use as positive evidence. Read with the authoritative retraction notice.
Corrective
PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: https://doi.org/10.1371/journal.pone.0342620. Role: correction-status authority and explicit methodological reasons.
Why Ancient Inquiry uses this source
correction-status authority and explicit methodological reasons. Formal retraction/correction record; use to document correction status, not as unqualified support.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
PLOS ONE Editors (2026), ‘Retraction: A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342613.
Why Ancient Inquiry uses this source
Authoritative journal correction-status record and statement of retraction reasons. Formal retraction/correction record; use to document correction status, not as unqualified support.
What it does not establish
A retraction notice governs the named paper; it does not automatically adjudicate every independent YDIH paper.
PLOS ONE Editors (2026), ‘Retraction: Shocked quartz at the Younger Dryas onset (12.8 ka) supports cosmic airbursts/impacts contributing to North American megafaunal extinctions and collapse of the Clovis technocomplex,’ PLOS ONE. DOI: https://doi.org/10.1371/journal.pone.0342620.
Why Ancient Inquiry uses this source
Authoritative retraction notice documenting age-model and sampling concerns for a prominent shocked-quartz claim. Formal retraction/correction record; use to document correction status, not as unqualified support.
What it does not establish
The notice governs the retracted paper and should not be generalized beyond its stated reasons.
Primary
Petaev, Michail I., et al. (2013). “Large Pt anomaly in the Greenland ice core…” _PNAS_ 110(32): 12917–12920. DOI: https://doi.org/10.1073/pnas.1303924110. Role: primary Pt anomaly observation; cite its caution.
Why Ancient Inquiry uses this source
primary Pt anomaly observation; cite its caution.
What it does not establish
Bibliographic verification does not by itself establish that the full text was read.
Research detail
Topic ID: CM-025 Last reviewed: 2026-08-10 Corrections: /corrections/ Change history: Recorded in the Connected Atlas topic changelog.
Overview
Reported platinum, spherule, charcoal, melt, and other anomalies require marker-specific tests of identity, background, date, diagnosticity, replication, and causal power.
Plain-language explanation
North Atlantic climate changed abruptly around 12,900 years ago. Proponents argue for one or more impacts or airbursts. Major reviews reject the broad package because the proposed markers are inconsistent, often non-unique, and lack a demonstrated synchronous causal chain.
Historical and scholarly context
The Younger Dryas climate event is not disputed. The cause remains a serious paleoclimate question, but mainstream explanations usually focus on ice-sheet retreat, freshwater routing, ocean circulation changes, atmospheric circulation, meltwater pulses, and regional feedbacks. These mechanisms do not require a cosmic impact.
Late Pleistocene megafaunal extinctions were also real, but they were not a single clean event. They occurred over different timings in different regions and likely involved climate change, human hunting pressure, habitat shifts, ecological stress, and regional differences. A single impact event does not explain this complexity well.
Clovis culture changed near the Younger Dryas onset, but that does not equal a population wipeout. Archaeological transitions can reflect changing tools, mobility, prey, environments, and regional adaptations. The claim that an impact destroyed Clovis or sharply reduced Paleoindian populations remains weak.
What the evidence supports
- The Younger Dryas climate reversal was abrupt and real, so a triggering mechanism is a legitimate question.
- Some geochemical anomalies and proposed markers have been reported near Younger Dryas boundary contexts.
- Impact and airburst events are real natural phenomena, and the late Pleistocene did include environmental instability.
- Some sites, especially Abu Hureyra in the proponent literature, are important enough to deserve focused review.
- The hypothesis has generated testable claims, such as marker distributions, dating, crater candidates, and cosmogenic-nuclide expectations.
Limits and disputed claims
- No accepted Younger Dryas-age crater has been confirmed.
- Several original markers have not been reproduced reliably by independent teams.
- Many proposed impact markers are not unique to impacts and can have terrestrial explanations.
- Dating control is often too weak to show a synchronous global event.
- The claimed chain from impact to wildfires to extinction to Clovis decline to flood myths is too broad for the available evidence.
- Hiawatha crater does not support YDIH after its Paleocene age dating.
- Tall el-Hammam is not a Younger Dryas site, but its 2025 retraction matters because it involved overlapping airburst-claim methods and figures, raising caution for similar evidence chains.
- Popular media often turns a disputed impact hypothesis into a certainty and then adds a lost-civilization layer with little direct evidence.
Claim status
- Well supported: Greenland Stadial 1/Younger Dryas conditions began abruptly in Greenland and North Atlantic records and ended near the Holocene boundary.
- Active debate: Proponents and critics continue to dispute marker identity, chronology, replication, and impact physics.
- Weakly supported: A Younger Dryas extraterrestrial impact or airburst remains a minority hypothesis: proponent papers report candidate markers, while major critical reviews find the proposed impact-to-climate, extinction, and cultural-disruption chain unestablished.
Sources
- Firestone, Richard B., et al. (2007). “Evidence for an extraterrestrial impact 12,900 years ago…” _PNAS_ 104(41): 16016–16021. DOI: <https://doi.org/10.1073/pnas.0706977104>. Role: founding broad modern hypothesis; historical claim source. — https://doi.org/10.1073/pnas.0706977104
- Surovell, Todd A., et al. (2009). “An independent evaluation…” _PNAS_ 106(43): 18155–18158. DOI: <https://doi.org/10.1073/pnas.0907857106>. Role: independent replication test. — https://doi.org/10.1073/pnas.0907857106
- Pinter, Nicholas, et al. (2011). “The Younger Dryas impact hypothesis: A requiem.” _Earth-Science Reviews_ 106: 247–264. DOI: <https://doi.org/10.1016/j.earscirev.2011.02.005>. Role: early multidisciplinary critical synthesis. — https://doi.org/10.1016/j.earscirev.2011.02.005
- Petaev, Michail I., et al. (2013). “Large Pt anomaly in the Greenland ice core…” _PNAS_ 110(32): 12917–12920. DOI: <https://doi.org/10.1073/pnas.1303924110>. Role: primary Pt anomaly observation; cite its caution. — https://doi.org/10.1073/pnas.1303924110
- Sweatman, Martin B. (2021). “The Younger Dryas impact hypothesis: Review of the impact evidence.” _Earth-Science Reviews_ 218: 103677. DOI: <https://doi.org/10.1016/j.earscirev.2021.103677>. Role: supportive synthesis. — https://doi.org/10.1016/j.earscirev.2021.103677
- Kenny, Gavin G., et al. (2022). “A Late Paleocene age for Greenland’s Hiawatha impact structure.” _Science Advances_ 8(10). DOI: <https://doi.org/10.1126/sciadv.abm2434>. Role: rules out prominent crater candidate. — https://doi.org/10.1126/sciadv.abm2434
- Holliday, Vance T., et al. (2023). “Comprehensive refutation of the Younger Dryas Impact Hypothesis.” _Earth-Science Reviews_ 247: 104502. DOI: <https://doi.org/10.1016/j.earscirev.2023.104502>. Role: current central critical review. — https://doi.org/10.1016/j.earscirev.2023.104502
- Sweatman, Martin B., James L. Powell, and Allen West (2024). “Rejection of Holliday et al.’s alleged refutation…” _Earth-Science Reviews_ 258: 104960. DOI: <https://doi.org/10.1016/j.earscirev.2024.104960>. Role: proponent counter-review. — https://doi.org/10.1016/j.earscirev.2024.104960
- Holliday, Vance T., et al. (2024). “Rebuttal of Sweatman, Powell, and West…” _Earth-Science Reviews_ 258: 104961. DOI: <https://doi.org/10.1016/j.earscirev.2024.104961>. Role: direct answer; display beside item 8. — https://doi.org/10.1016/j.earscirev.2024.104961
- Green, Charlotte E., et al. (2025). “A possible volcanic origin for the Greenland ice core Pt anomaly…” _PLOS One_ 20(9): e0331811. DOI: <https://doi.org/10.1371/journal.pone.0331811>. Role: new geochemical/chronological alternative for Pt anomaly. — https://doi.org/10.1371/journal.pone.0331811
- PLOS One Editors (2026). “Retraction: Shocked quartz at the Younger Dryas onset…” _PLOS One_ 21(2): e0342620. DOI: <https://doi.org/10.1371/journal.pone.0342620>. Role: correction-status authority and explicit methodological reasons. — https://doi.org/10.1371/journal.pone.0342620
- Moore, Christopher R., et al. (2026). “Extraterrestrial Nanoparticle Signatures… Wonderkrater.” _F1000Research_ 15:1089, version 1. DOI: <https://doi.org/10.12688/f1000research.184551.1>. Role: newest proponent report; awaiting peer review at cutoff, not confirmation. — https://doi.org/10.12688/f1000research.184551.1
This public draft omits internal numeric scoring and administrative notes. Claim labels describe evidentiary status, not topic importance.