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Controversial impact crater under Greenland’s ice is surprisingly ancient New date of 58 million years undercuts idea that strike triggered recent 1000-year plunge in temperatures By Paul Voose, Science News, March, 9, 2022 Giant impact crater in Greenland occurred a few million years after dinosaurs went extinct by University of Copenhagen, PhysOrg Wikipedia article discussing Hiawatha impact structure The open access paper is: Kenny, G. G., and others, 2022, A Late Paleocene age for Greenland’s Hiawatha impact structure. Science Advances. vol. 8, no. 10 Yours, Paul H.

Australians find extremely rare mineral in meteorite impact crater. Cecilia Jamasmie, Mining Com, October 16, 2018 http://www.mining.com/australians-find-extremely-rare-mineral-meteorite-impact-crater/ Ultra-rare mineral points to huge impact crater in Australia Michael Irving, New Atlas, October 17, 2018 https://newatlas.com/reidite-rarest-mineral-meteor-woodleigh-crater/56813/ the paper is: Cox, M.A., Cavosie, A.J., Bland, P.A., Miljković, K. and Wingate, M.T., 2018. Microstructural dynamics of central uplifts: Reidite offset by zircon twins at the Woodleigh impact structure, Australia. Geology, 46(11), pp.983-986. https://www.researchgate.net/publication/327938191_Microstructural_dynamics_of_central_uplifts_Reidite_offset_by_zircon_twins_at_the_Woodleigh_impact_structure_Australia https://www.researchgate.net/profile/Aaron_Cavosie https://pubs.geoscienceworld.org/gsa/geology/article-abstract/548639 Yours, Paul H.