NASA's Operation IceBridge radar and laser surveys in 2015 revealed a bowl-shaped depression in the bedrock beneath Greenland's Hiawatha Glacier.
Sources
- City-size impact crater found under Greenland ice (nationalgeographic.com)
- https://www.nasa.gov/news-release/international-team-nasa-make-unexpected-discovery-under-greenland-ice (nasa.gov)
- https://www.sciencenews.org/article/hiawatha-crater-greenland-age-younger-dryas (sciencenews.org)
- https://www.science.org/doi/10.1126/sciadv.aar8173 (science.org)
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