K-T boundary (Cretaceous-Tertiary), Royal Tyrrell Dinosaur Museum, Drumheller, Alberta, Canada

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Photo credit: © Michelle Gilders / Alamy / Afripics
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Keywords: -, -pg, alvarez, boundary, cenozoic, chicxulub, cosmic, crater, crator, cretaceous, cretaceous-paleogene, crust, deccan, dinosaurs, disaster, earth, ele, event, extinction, geological, geology, hypothesis, impact, iridium, layer, level, maastrichtian, marine, mass, mesozoic, meteor, meteorite, regression, siderophile, stratigraphy, strike, supernova, tertiary, trap, traps