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Sudbury Basin

second largest verified astrobleme on earth, remain of an Paleoproterozoic Era impact

The Sudbury Basin is the second largest impact crater on earth. The crater, formed about 1.85 billion years ago, originally had a diameter of 250 km round crater. Subsequent geological processes have deformed the crater into the current smaller, oval (60 x 30 km) shape.

Lake Wanapitei, at the northeastern edge of the Sudbury Basin, fills another impact crater with a diameter of 8 km, and a age of 37 million yeras.