Secret History
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The Sudbury Basin is located near a number of other geological structures, including the Temagami Magnetic Anomaly, the Lake Wanapitei impact crater, the western end of the Ottawa-Bonnechere Graben, the Grenville Front Tectonic Zone and the eastern end of the Great Lakes Tectonic Zone, although none of the structures are directly related to each other in the sense of resulting from the same geological processesCanada sure seems to attract their regular cyclic interstellar strikes. Maybe there is a metaphoric magnetic 'bullseye' causing the location to be targeted so much....
Models suggest that for such a large impact, debris was most likely scattered globally, but has since been eroded away. Its present size is believed to be a smaller portion of a 130 km (81 mi) round crater that the bolide originally created. Subsequent geological processes have deformed the crater into the current smaller oval shape. Sudbury Basin is the third-largest crater on Earth, after the 300 km (190 mi) Vredefort crater in South Africa, and the 150 km (93 mi) Chicxulub crater under Yucatán, Mexico.I don't think they quite got their dating correct, however, as it is possible that they used one or two extra 0's there... maybe.
Because considerable erosion has occurred since the Sudbury event, an estimated 6 km (3.7 mi) in the North Range, it is difficult to directly constrain the actual size of the diameter of the original transient cavity, or the final rim diameter.
Also Canadian/NW USA