A mass extinction perhaps caused by a large asteroid hitting Earth near the Yucatan peninsula occurred during the:

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The mass extinction caused by a large asteroid hitting the Earth near the Yucatan peninsula is known as the K-T extinction event. This event occurred at the end of the Cretaceous period, approximately 65 million years ago, and resulted in the extinction of over 75% of all plant and animal species on Earth, including the dinosaurs.

A Mass Extinction Perhaps Caused by a Large Asteroid Hitting