Dinosaur-killing asteroid may have made Earth’s largest ripple marks

The asteroid impact that slew the dinosaurs may have also indirectly sculpted the largest ripple marks ever found on Earth.

A series of ridgelike structures more than three stories high and spaced nearly two Eiffel Towers apart appear to be buried about 1,500 meters beneath central Louisiana. The oversized features are megaripples shaped by a massive tsunami generated by the Chicxulub asteroid impact, researchers report in the Sept. 15 Earth and Planetary Science Letters.

“It’s just interesting that something that happened 66 million years ago could be so well preserved, buried 5,000 feet down in the sediments of Louisiana,” says geologist Gary Kinsland of the University of Louisiana at

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