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Few episodes in history are as widely recognized as the Cretaceous-Paleogene, or K-Pg, boundary 66 million years ago. Most Geoscientists can recall the large bolide impact and mass extinction that killed the dinosaurs and gave rise to the Age of Mammals. Yet, regarding the quarter-century debate over whether the Chicxulub impact or Deccan volcanism caused the K-Pg extinction, “as the evidence mounts, it becomes more convincing that both could’ve played a role,” Prof. Blair Schoene states.