The Popigai impact structure is a remnant of a huge crater in Siberia, 100 km across. It was formed when a comet or asteroid hit the Earth, some time between 5 and 65 million years ago — no one could be more precise than that. But now it has been dated to about 35.5 million years ago, almost the same time as the Chesapeake Bay crater off the coast of North America. Could these two impacts together have caused the mass extinction of the late Eocene?
- Dieter Stöffler
- Philippe Claeys
