Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)

Holliday, Vance T.; Daulton, T. L.; Bartlein, Patrick J.; Boslough, M. B.; Breslawski, Ryan P.; Fisher, Abigail; Jorgeson, Ian; Scott, Andrew C.; Koeberl, Christian; Marlon, Jennifer R.; Severinghaus, Jeffrey P.; Petaev, M. I.; Claeys, Philippe

doi:10.1016/j.earscirev.2023.104502

Cited by 6 publications

(2 citation statements)

References 344 publications

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“…This interpretation was based on a detailed analysis of multiple climate proxies from a single ice core, GISP2 [20] (click on Supplementary Information Figure 76). However, this conclusion was disputed by Holliday et al [104], who claimed the YD onset occurred 30 years before the Pt peak. Holliday et al based that conclusion on comparing climate proxies from multiple ice cores using the multi-core GICC05 timescale, and they neglected to consider the GICC05 uncertainties of ± 140 years.…”

Section: Site Datingmentioning

confidence: 97%

“…The ∼12.8 ka YDB layer at ∼50 broadly distributed sites has been extensively reported to contain abundance peaks of one or more potential impact-related proxies, including iron-enriched or glassy microspherules, meltglass, charcoal, aciniform carbon, soot, glasslike carbon, carbon microspherules, nanodiamonds, PAHs, Pt, Ir, and Ni, among others [5,7,13,15,16,22,23]. Some YDIH critics consider these YDB proxies individually in isolation, claiming they are merely coincidentally associated, and they invoke alternative hypotheses for each proxy's provenance [104,[110][111][112][113]. However, no critic has identified any other non-impact layer that coincidentally contains the broad suite of these proxies found in the YDB layer.…”

Section: The Ydb As An "Impact Spherule Datum Layer"mentioning

confidence: 99%

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Platinum, shock-fractured quartz, microspherules, and meltglass widely distributed in Eastern USA at the Younger Dryas onset (12.8 ka)

Moore,

LeCompte,

Kennett

et al. 2024

Airbursts and Cratering Impacts

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Sediment sequences spanning the 12,800-year-old lower Younger Dryas boundary (YDB) were investigated at three widely separated sites in eastern North America (Parsons Island, Maryland, a Newtonville sandpit in southern New Jersey, and Flamingo Bay, South Carolina). All sequences examined exhibit peak abundances in platinum (Pt), microspherules, and meltglass representing the YDB cosmic impact layer resulting from the airbursts/impacts of a fragmented comet ∼12,800 years ago. The evidence is consistent with the Younger Dryas impact hypothesis (YDIH) recorded at ∼50 other sites across North and South America, Europe, Asia, and the Greenland ice sheet. These sequences were also examined for shock-fractured quartz, based on a recent study suggesting that low-shock metamorphism may result from low-altitude bolide airbursts similar to that observed during near-surface atomic detonations. Now, for the first time in a suite of well-separated sites in North America, we report in the YDB the presence of quartz grains exhibiting shock fractures containing amorphous silica. We also find in the YDB high-temperature melted chromferide, zircon, quartz, titanomagnetite, ulvöspinel, magnetite, native iron, and PGEs with equilibrium melting points (∼1,250° to 3,053°C) that rule out anthropogenic origins for YDB microspherules. The collective evidence meets the criteria for classification as an “impact spherule datum.”

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Section: Site Datingmentioning

confidence: 97%

Section: The Ydb As An "Impact Spherule Datum Layer"mentioning

confidence: 99%

Platinum, shock-fractured quartz, microspherules, and meltglass widely distributed in Eastern USA at the Younger Dryas onset (12.8 ka)

Moore,

LeCompte,

Kennett

et al. 2024

Airbursts and Cratering Impacts

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Data vs. Derision: The Ethics of Language in Scientific Publication. The Younger Dryas Impact Hypothesis as a Case Study

Powell

2024

J Acad Ethics

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Throughout the history of science, novel ideas that diverge from mainstream thought have often been met with condemnation, derision, and ad hominem attacks. These reactions have sometimes led to the premature rejection of such ideas, only for them to be later revived and even accepted as the prevailing paradigm. While robust debate is essential in science, the use of derogatory language is unethical, for it discourages research on existing hypotheses, deters funders, corrupts the scientific record, and delays or prevents the advancement of science. In this article, I discuss the case of unethical language repeatedly used against proponents of the hypothesis that an extraterrestrial impact event triggered the Younger Dryas cool period.

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An air-fall ash layer in the Grotta dei Baffoni cave in the Frasassi Gorge (Marche Apennine, Italy): Relevance to the Younger Dryas debate

Montanari,

Koeberl,

Schulz

et al. 2024

Journal of Volcanology and Geothermal Research

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Comprehensive refutation of the Younger Dryas Impact Hypothesis (YDIH)

Cited by 6 publications

References 344 publications

Platinum, shock-fractured quartz, microspherules, and meltglass widely distributed in Eastern USA at the Younger Dryas onset (12.8 ka)

Platinum, shock-fractured quartz, microspherules, and meltglass widely distributed in Eastern USA at the Younger Dryas onset (12.8 ka)

Data vs. Derision: The Ethics of Language in Scientific Publication. The Younger Dryas Impact Hypothesis as a Case Study

An air-fall ash layer in the Grotta dei Baffoni cave in the Frasassi Gorge (Marche Apennine, Italy): Relevance to the Younger Dryas debate

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