No evidence of an extraterrestrial impact 13,000 years ago, studies say.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
References
Surovell, T. A. et al. Proc. Natl Acad. Sci. USA advance online publication doi:10.1073/pnas.0907857106 (2009).
Firestone, R. B. et al. Proc. Natl Acad. Sci. USA 104, 16016-16021 (2007).
Marlon, J. R. et al. Proc. Natl Acad. Sci. USA 106, 2519-2524 (2009).
Kennett, D. J. et al. Proc. Natl Acad. Sci. USA 106, 12623-12628 (2009).
Related links
Rights and permissions
About this article
Cite this article
Dalton, R. North America comet theory questioned. Nature (2009). https://doi.org/10.1038/news.2009.997
Published:
DOI: https://doi.org/10.1038/news.2009.997