An impact that took place at about the time of the extinction of the dinosaurs (and may in fact have caused their extinction) is believed to have created

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The impact that is widely believed to have caused the extinction of the dinosaurs about 66 million years ago created the Chicxulub Crater in the Yucatán Peninsula. This event is associated with a significant layer of iridium found worldwide in the geological record, known as the Cretaceous-Paleogene (K-Pg) boundary, indicating a massive impact event.

An Impact That Took Place at About the Time of the Extinction