Harvard researchers calculated that distributing approximately 30 parts per trillion of platinum worldwide would have required a meteorite about half a mile across, large enough to leave a substantial crater.
Sources
- Did a Comet Really Kill the Mammoths 12,900 Years Ago? (nationalgeographic.com)
- https://www.pnas.org/doi/10.1073/pnas.1303924110 (pnas.org)
- https://martinsweatman.blogspot.com/2021/05/the-following-article-has-been-accepted.html (martinsweatman.blogspot.com)
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