# Boundary-layer sediment samples from the 2007 sites

> Samples from Murray Springs, Blackwater Draw, Arlington Canyon and other sites. No public archive of the original samples was found; later tests…

Source: https://mysteriesdept.com/mysteries/younger-dryas-impact/artifacts/ART0D51XY9P3QFB/boundary-layer-sediment-samples-from-the-2007-sites  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Mysteries](https://mysteriesdept.com/mysteries)[Younger Dryas impact hypothesis](https://mysteriesdept.com/mysteries/younger-dryas-impact)[Artifacts](https://mysteriesdept.com/mysteries/younger-dryas-impact#artifacts)Boundary-layer sediment samples from the 2007 sites

**ART** 0D51XY9P3QFB·Artifact · sample

# Boundary-layer sediment samples from the 2007 sites

SamplepublisherMagnetic grains, microspherules and other markers reported 2007

[Cite]

**Not kept here.** This copy isn't ours to show. [See it where it's published](https://doi.org/10.1073/pnas.0706977104).

Samples from Murray Springs, Blackwater Draw, Arlington Canyon and other sites. No public archive of the original samples was found; later tests resampled the sites.

Richard Firestone and colleagues, 2007. publisher

## Copies 1

**Document** Richard Firestone and colleagues · doi.org · 2007-10-09 · publisherPrimary source: [Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling](https://mysteriesdept.com/sources/SRC0D51WPR222ST/evidence-for-an-extraterrestrial-impact-12-900-years-ago)2 steps from the original

[Where it's published](https://doi.org/10.1073/pnas.0706977104)

## Where it was made

[North America](https://mysteriesdept.com/records/PLC0D51WZ9G2FJY/north-america) · Region

## Sources 2

- [An independent evaluation of the Younger Dryas extraterrestrial impact hypothesis](https://mysteriesdept.com/sources/SRC0D51WPZW3D1V/an-independent-evaluation-of-the-younger-dryas)_SRC_
- [Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling](https://mysteriesdept.com/sources/SRC0D51WPR222ST/evidence-for-an-extraterrestrial-impact-12-900-years-ago)_SRC_

## Cite it

```
Mysteries Department. (2026). Boundary-layer sediment samples from the 2007 sites [Artifact ART0D51XY9P3QFB]. https://mysteriesdept.com/r/ART0D51XY9P3QFB
```

Key

**ART** 0D51XY9P3QFB

Kind

Sample

Held by

the authors' laboratories (not catalogued)

Dated

magnetic grains, microspherules and other markers reported 2007; not reproduced by an independent team, 2009

Licence

publisher

Place

[North America](https://mysteriesdept.com/records/PLC0D51WZ9G2FJY/north-america)

Part of

[Younger Dryas impact hypothesis](https://mysteriesdept.com/mysteries/younger-dryas-impact)

The record

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[JSON](https://mysteriesdept.com/api/v1/records/ART0D51XY9P3QFB)