# Wittke 2013: Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago

> James H. Wittke, James C. Weaver, Ted E. Bunch et al., 2013. 4 records on Mysteries Department cite it. The proponents' main spherule dataset.

Source: https://mysteriesdept.com/sources/SRC0D51WR6Y55NF/evidence-for-deposition-of-10-million-tonnes-of-impact  
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[Sources](https://mysteriesdept.com/sources)[Younger Dryas impact hypothesis](https://mysteriesdept.com/mysteries/younger-dryas-impact)Wittke 2013

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# Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago

James H. Wittke, James C. Weaver, Ted E. Bunch et al., 2013. _Proceedings of the National Academy of Sciences 110(23)_.

About 700 SEM-EDS analyses of spherules from 18 sites in North America, Europe and the Middle East; argues they formed by melting of sediment above 2,200 °C and estimates 10 million tonnes spread over about 50 million km².

**Younger Dryas impact hypothesis** Articledoi: **[10.1073/pnas.1301760110](https://doi.org/10.1073/pnas.1301760110)** Checked against the original0

## What it's used for here

The proponents' main spherule dataset.

## Cited by on this site 4 records

[The markers form only at the temperatures and pressures of impacts and airbursts, and they peak at the…](https://mysteriesdept.com/mysteries/younger-dryas-impact/answers/ANS0D51XFD40S6P/the-markers-form-only-at-the-temperatures-and-pressures-of)

Answer

ANS

[About 700 SEM-EDS analyses of spherules from 18 sites are said to be inconsistent with volcanic, cosmic…](https://mysteriesdept.com/mysteries/younger-dryas-impact/evidence/EVD0D51XFMY6725/about-700-sem-eds-analyses-of-spherules-from-18-sites-are)

Evidence

EVD

[Proponents report boundary-layer peaks at dozens of sites in North America, Europe, the Middle East and…](https://mysteriesdept.com/mysteries/younger-dryas-impact/evidence/EVD0D51XA922RG4/proponents-report-boundary-layer-peaks-at-dozens-of-sites-in)

Evidence

EVD

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

The mystery article

MYS

## Cite it

```
Wittke, J. H., Weaver, J. C., Bunch, T. E., Kennett, J. P., Kennett, D. J., Moore, A. M. T., & and others (2013). Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago. Proceedings of the National Academy of Sciences 110(23). https://doi.org/10.1073/pnas.1301760110
```

[Read it free at doi.org](https://doi.org/10.1073/pnas.1301760110)

Key

**SRC** 0D51WR6Y55NF

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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