A 2009 study by Todd A. Surovell, Vance T. Holliday, and colleagues, published in Proceedings of the National Academy of Sciences (Vol. 106, No. 43), independently analyzed magnetic minerals and microspherules from seven sites of similar age to test the Younger Dryas impact hypothesis.
Sources
- An independent evaluation of the Younger Dryas - jstor (jstor.org)
- https://www.pnas.org/doi/10.1073/pnas.0907857106 (pnas.org)
- https://experts.arizona.edu/en/publications/an-independent-evaluation-of-the-younger-dryas-extraterrestrial-i/ (experts.arizona.edu)
- https://www.pnas.org/doi/10.1073/pnas.1208603109 (pnas.org)
- https://onlinelibrary.wiley.com/doi/abs/10.1002/jqs.2724 (onlinelibrary.wiley.com)