Oklahoma's Ames crater is 100 million years younger and coincided with a mass extinction

A new study dates Oklahoma's Ames crater to 370 million years ago, not 467 million, based on zircon crystal analysis. The impact coincided with the Frasnian-Famennian mass extinction that killed up to half of marine life.

• Ames crater is 16 km wide, the fourth-largest impact structure in the U.S.
• Zircon fracture analysis revised its age from 467 million to 370 million years
• The impact overlapped with the Kellwasser extinction starting 372 million years ago
• An Eiffel Tower-size asteroid struck at over 110,000 km/h