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Charlevoix impact structure

Impact crater in Québec
The Charlevoix impact structure is a large eroded meteorite impact structure in the Charlevoix region of Quebec, Canada. Only part of the impact structure is exposed at the surface, the rest lying beneath the Saint Lawrence River. Wikipedia
Coordinates: 47°32′N 70°18′W / 47.533°N 70.300°W
Age: 450 ± 20 Ma; Ordovician to Silurian age
Diameter: 54 km (34 mi)