# No impact or airburst occurred; the proposed markers are terrestrial or background cosmic material…

> Most likely: No impact or airburst occurred; the proposed markers are terrestrial or background cosmic material concentrated by ordinary sedimentary…

Source: https://mysteriesdept.com/mysteries/younger-dryas-impact/answers/ANS0D51XBQY621Q/no-impact-or-airburst-occurred-the-proposed-markers-are  
Publisher: Mysteries Department  
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[Questions](https://mysteriesdept.com/questions)[Younger Dryas impact hypothesis](https://mysteriesdept.com/mysteries/younger-dryas-impact)[Did an extraterrestrial impact or airburst occur at the onset of the Younger Dryas, about 12,800 years ago?](https://mysteriesdept.com/mysteries/younger-dryas-impact/questions/QST0D51X8AJ1304/did-an-extraterrestrial-impact-or-airburst-occur-at-the)Answer

Answer · Younger Dryas impact hypothesis

# No impact or airburst occurred; the proposed markers are terrestrial or background cosmic material…

No impact or airburst occurred; the proposed markers are terrestrial or background cosmic material concentrated by ordinary sedimentary processes.

**Most likely** Answers **1** questionPublished0

## Where it stands

**Most likely** Its tests supported it: two pieces of evidence for, one against. It needs two reviews to be accepted.

## What it predicts

- The markers occur at many levels, with peaks where sedimentation slowed or surfaces stabilised.
- Their abundance at the boundary is within the range of background variation once whole sections are sampled.
- No synchronous layer survives dating at well-controlled sites.

## What would rule it out

- A blind, multi-laboratory study on a complete, densely dated section finds a marker peak at the onset far above the background of the whole section, repeated at several independent sites.

## Evidence 2 for · 1 against

[Electron microscopy identified claimed nanodiamonds as graphene and graphene-oxide aggregates.](https://mysteriesdept.com/mysteries/younger-dryas-impact/evidence/EVD0D51XC7J46QR/electron-microscopy-identified-claimed-nanodiamonds-as)

Supported

FOR

[The Lubbock Lake blind test found microspherules and nanodiamonds low or absent at the boundary and abundant…](https://mysteriesdept.com/mysteries/younger-dryas-impact/evidence/EVD0D51XBZR4HB4/the-lubbock-lake-blind-test-found-microspherules-and)

Supported

FOR

[The GISP2 platinum spike has no agreed terrestrial source.](https://mysteriesdept.com/mysteries/younger-dryas-impact/evidence/EVD0D51XCFC149Z/the-gisp2-platinum-spike-has-no-agreed-terrestrial-source)

Supported

AGAINST

## The questions it answers

[Did an extraterrestrial impact or airburst occur at the onset of the Younger Dryas, about 12,800 years ago?](https://mysteriesdept.com/mysteries/younger-dryas-impact/questions/QST0D51X8AJ1304/did-an-extraterrestrial-impact-or-airburst-occur-at-the)

Most likelyNo impact or airburst occurred; the proposed markers are terrestrial or background cosmic material…

## Cite it

```
Mysteries Department. (2026). No impact or airburst occurred; the proposed markers are terrestrial or background cosmic material… [Answer ANS0D51XBQY621Q]. https://mysteriesdept.com/r/ANS0D51XBQY621Q
```

Key

**ANS** 0D51XBQY621Q

Kind

Answer · hypothesis

Origin

Published

Version

1

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