# Surovell 2009: An independent evaluation of the Younger Dryas extraterrestrial impact hypothesis

> Todd A. Surovell, Vance T. Holliday, Joseph A. M. Gingerich et al., 2009. 5 records on Mysteries Department cite it. The first independent replication…

Source: https://mysteriesdept.com/sources/SRC0D51WPZW3D1V/an-independent-evaluation-of-the-younger-dryas  
Publisher: Mysteries Department  
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# An independent evaluation of the Younger Dryas extraterrestrial impact hypothesis

Todd A. Surovell, Vance T. Holliday, Joseph A. M. Gingerich et al., 2009. _Proceedings of the National Academy of Sciences 106(43), 18155–18158_.

Analysed magnetic minerals and microspherules at seven sites of Younger Dryas age, two of them sampled by Firestone et al., and could not reproduce any of the 2007 results.

**Younger Dryas impact hypothesis** Articledoi: **[10.1073/pnas.0907857106](https://doi.org/10.1073/pnas.0907857106)** Checked against the original0

## What it's used for here

The first independent replication attempt; evidence against the proxy claims.

## Cited by on this site 5 records

[Boundary-layer sediment samples from the 2007 sites](https://mysteriesdept.com/mysteries/younger-dryas-impact/artifacts/ART0D51XY9P3QFB/boundary-layer-sediment-samples-from-the-2007-sites)

ART

[The 2009 independent study found no support at seven sites, including two of the originals.](https://mysteriesdept.com/mysteries/younger-dryas-impact/evidence/EVD0D51XGW059BP/the-2009-independent-study-found-no-support-at-seven-sites)

Evidence

EVD

[An independent team fails to reproduce the 2007 magnetic grain and microspherule results](https://mysteriesdept.com/mysteries/younger-dryas-impact/events/EVT0D51X4X664HS/an-independent-team-fails-to-reproduce-the-2007-magnetic)

EVT

[Todd A. Surovell](https://mysteriesdept.com/mysteries/younger-dryas-impact/people/FIG0D51X36G0YEB/todd-a-surovell)

FIG

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

The mystery article

MYS

## Cite it

```
Surovell, T. A., Holliday, V. T., Gingerich, J. A. M., Ketron, C., Haynes, C. V., Hilman, I., Wagner, D. P., Johnson, E., & Claeys, P. (2009). An independent evaluation of the Younger Dryas extraterrestrial impact hypothesis. Proceedings of the National Academy of Sciences 106(43), 18155–18158. https://doi.org/10.1073/pnas.0907857106
```

[Read it free at doi.org](https://doi.org/10.1073/pnas.0907857106)

Key

**SRC** 0D51WPZW3D1V

Kind

Journal article

Rights

The publisher's

Checked

Against the published article

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

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