James Kennett, an emeritus geologist at the University of California, Santa Barbara, stated that carbon spherules occur throughout the geological record but reach a peak at the Younger Dryas boundary.
Sources
- Fungi, Feces Show Comet Didn't Kill Ice Age Mammals? (nationalgeographic.com)
- https://www.pnas.org/doi/10.1073/pnas.1301760110 (pnas.org)
- https://news.ucsb.edu/2013/013537/comprehensive-analysis-impact-spherules-supports-theory-cosmic-impact-12800-years-ago (news.ucsb.edu)
- https://www.sciencedaily.com/releases/2015/07/150727180224.htm (sciencedaily.com)
- https://news.ucsb.edu/2018/018701/big-burn (news.ucsb.edu)
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