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So they believe the 'new' one occurred first, several thousand years before the Chicxulub impact. So how big was the Ukraine impact - big enough to cause extinction? How do they know the second layer was the result of the Chicxulub impact and not another, closer impact that they have not yet discovered? We only need to look at the moon to know that the earth had to have been bombarded at some point(s) in the past, the fact that we have only been able to uncover a handful of craters doesn't really tell us much!
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