The oldest impact crater yet found on Earth has been identified in Greenland. The formation, badly degraded by geological processes, is put at three billion years old.
The crater is 62 miles across, and scientists put the meteor that made it at 19 miles across. That would be a Doomsday Rock, ending virtually all life on Earth, if it struck today. Three billion years ago, by the fossil record, all life on Earth was single-celled, and obviously some of it survived the impact. As life gets more complex, it also gets more vulnerable. Something to keep in mind.
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