BBC News – DR Congo ring may be giant ‘impact crater’
The Chicxulub crater is buried under Mexico's Yucatan Peninsula
Vredefort: S Africa, 300km-wide, 2 billion years old
Sudbury: Canada, 250km-wide, 1.8 billion years old
Chicxulub: Mexico, 170km-wide, 65 million years old
Popigai: Russia, 100km-wide, 35.7 million years old
Manicouagan: Canada, 100km-wide, 214 million years old
via BBC News – DR Congo ring may be giant ‘impact crater’.
[...] was not that this had not happened before, just not in a place that ejected a particularly high amount of particles in the atmosphere. [...]