In the Greenland ice core studied by Harvard researchers, platinum concentration increased by more than a hundredfold over roughly 20 years before subsiding.
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://www.ncbi.nlm.nih.gov/pmc/articles/PMC5343653/ (ncbi.nlm.nih.gov)
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