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The 66-million-year-old Cretaceous-Paleogene boundary layer at Stevns Klint in Denmark is seen in this undated photograph obtained by Reuters on August 14, 2024. This boundary layer contains the globally distributed fallout produced by the asteroid impact at Chicxulub, Mexico. Philippe Claeys/Handout via REUTERS. NO RESALES. NO ARCHIVES. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY
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