Studying largest impact crater in the US, buried for 35 million years
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.
Paleontology News — ScienceDaily