Studying largest impact crater in the US, buried for 35 million years

Source: Science Daily

About 35 million years ago, an asteroid hit the ocean off the East Coast of North America. Its impact formed a 25-mile diameter crater that now lies buried beneath the Chesapeake Bay. A team of researchers has obtained drilling samples from the Ocean Drilling Project site 1073 and dated them with the ”uranium-thorium-helium technique” for the first time.

https://www.sciencedaily.com/releases/2019/08/190813160532.htm