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dinosaur-extinction
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A thin clay layer worldwide is rich in iridium, which is rare in Earth's crust and common in asteroids. The 180-kilometre crater was found under the Yucatán a decade later. The role of the Deccan Traps volcanism alongside the impact is still argued.
Evidence tier V3 is the import default for a result the curation records as settled in the published record. No formal proof or certificate is attached to this page yet.
Posed 19th century. Closed 1980, Luis and Walter Alvarez propose an impact; 1991, Chicxulub crater identified.